WO2024021755A1

WO2024021755A1 - Backlight module, display device, and backlight control method

Info

Publication number: WO2024021755A1
Application number: PCT/CN2023/093002
Authority: WO
Inventors: 余洋; 谢月飞; 李慧玲
Original assignee: 华为技术有限公司
Priority date: 2022-07-27
Filing date: 2023-05-09
Publication date: 2024-02-01
Also published as: CN117518587A

Abstract

The present application relates to the technical field of optical display, and provides a backlight module, a display device, and a backlight control method. The backlight module is used in a display device, and control complexity of the backlight module is lower than that of existing backlight modules. The backlight module comprises a plurality of light-emitting devices and a driving circuit connected to the plurality of light-emitting devices. The driving circuit is configured to obtain a first backlight control signal of a first image frame and a second backlight control signal of a second image frame, wherein the first backlight control signal comprises switching signals respectively corresponding to the plurality of light-emitting devices, the second image frame is an image frame previous to the first image frame, and the second backlight control signal comprises switching signals respectively corresponding to the plurality of light-emitting devices; and switch on/off states of the light-emitting devices corresponding to different switching signals in the first backlight control signal and the second backlight control signal.

Description

A backlight module, display device and backlight control method

This application requests the priority of the Chinese patent application submitted to the State Intellectual Property Office of China on July 27, 2022, with the application number 202210896066.8 and the application title "A backlight module, display device and backlight control method", and its entire contents incorporated herein by reference.

Technical field

The present application relates to the field of light display technology, and in particular to a backlight module, a display device and a backlight control method.

Background technique

Most display devices are equipped with a backlight module and a display panel for displaying images. The backlight module includes a light panel. The light panel is provided with multiple light-emitting devices distributed in an array. One or more of the multiple light-emitting devices The light-emitting device is turned on, and the turned-on light-emitting device emits light to generate a light beam, and the light beam is transmitted to the display panel. The display panel receives the image frame, and driven by the image frame, the display panel displays the image.

When the display panel displays images corresponding to two adjacent image frames, the light beams required for the two adjacent image frames may be different, so it is necessary to control the different light-emitting devices in the backlight module to turn on to generate different light beams. Among them, when displaying the image corresponding to the latter image frame among the two adjacent image frames, the backlight module is usually controlled first to turn on the light-emitting device corresponding to the previous image frame among the two adjacent image frames. Turn off, and then control to turn on the light-emitting device corresponding to the latter of the two adjacent image frames, and the control complexity is high.

Especially in the directional backlight technology of naked-eye three-dimensional (3D) technology, the two adjacent image frames are often the left eye image frame and the right eye image frame, and there is a need between the left eye image frame and the right eye image frame. Fast switching makes the control complexity of existing backlight modules higher.

Contents of the invention

This application provides a backlight module, a display device and a backlight control method. The backlight module is used in a display device. The control complexity of the backlight module is lower than that of the existing backlight module.

In a first aspect, a backlight module is provided for use in a display device. The backlight module includes a plurality of light-emitting devices and a driving circuit connected to the plurality of light-emitting devices; the driving circuit is used to obtain the first backlight of the first image frame. control signal, and a second backlight control signal of the second image frame, wherein the first backlight control signal includes a switching signal corresponding to each light-emitting device in the plurality of light-emitting devices, and the second image frame is the previous one of the first image frame. In the image frame, the second backlight control signal includes a switching signal corresponding to each light-emitting device in the plurality of light-emitting devices; switching the switching state of the light-emitting device corresponding to a different switching signal in the first backlight control signal and the second backlight control signal. In the above backlight module, since the first backlight control signal is the backlight control signal of the first image frame, the second backlight control signal is the backlight control signal of the second image frame, and the second image frame is the backlight control signal of the first image frame. The previous image frame, and the driving circuit can obtain the first backlight control signal, or can compare the first backlight control signal with the second backlight control signal, and determine the difference between the first backlight control signal and the second backlight control signal in turn. One or more different switching signals. This one or more different switching signals are the light-emitting devices that need to be switched on and off based on the light-on states of all the light-emitting devices corresponding to the second image frame, and these After the switching state of the light-emitting device that needs to be switched is switched, it is the light-on state of all the light-emitting devices corresponding to the first image frame. Therefore, the driving circuit switches the switching state of the light-emitting devices corresponding to one or more different switching signals according to one or more different switching signals, so that when switching between two adjacent image frames, there is no need to first switch all the light-emitting devices All are turned off, and then the corresponding light-emitting device is turned on. It only needs to switch the on-off state of the light-emitting device that needs to be switched under the action of at least one light-on signal, so that the number of light-emitting devices that need to be refreshed is reduced, so that the backlight module The control complexity is reduced.

Optionally, the first image frame is a left eye image frame, the switch state corresponding to the first backlight control signal is that the light emitting device is turned on to generate a first beam, and the first beam is transmitted to the left eye; the second image frame is a right eye image frame. , the switch state corresponding to the second backlight control signal is that the light-emitting device that is turned on generates a second beam, and the second beam is transmitted to the right eye; or, the first image frame is a right eye image frame, and the switch state corresponding to the first backlight control signal is The light-emitting device that is turned on generates a first light beam, and the first light beam is transmitted to the right eye; the second image frame is an image frame for the left eye, and the switch state corresponding to the second backlight control signal is that the light-emitting device that is turned on generates a second light beam, and the second light beam is transmitted to the left eye. In this optional method, the backlight module is a backlight module in directional backlight technology. In directional backlight technology, the image frame switching method is left eye image frame, right eye image frame, left eye image frame, right eye image Frame... Therefore, the two adjacent image frames can be that the first image frame is a left eye image frame, the second image frame is a right eye image frame, and the switch state of the multiple light emitting devices corresponding to the first backlight control signal is on. The device generates a first light beam, and the first light beam is transmitted to the left eye, and the light-emitting device whose switch state is on among the plurality of light-emitting devices corresponding to the second backlight control signal generates a second light beam, and the second light beam is transmitted to the right eye; or the first image The frame is a right-eye image frame, the second image frame is a left-eye image frame, the light-emitting device whose switch state is on among the plurality of light-emitting devices corresponding to the first backlight control signal generates a first light beam, and the first light beam is transmitted to the right eye, and the first light beam is transmitted to the right eye. Among the plurality of light-emitting devices corresponding to the two backlight control signals, the light-emitting device whose switch state is on generates a second light beam, and the second light beam is transmitted to the left eye. Moreover, in the directional backlight technology, the backlight control signals of dozens of adjacent image frames or even hundreds of image frames are closely related, and the switching speed is very fast, then according to the first backlight control signal of the first image frame Compare the signal with the second backlight control signal of the second image frame, find a switch signal in the first backlight control signal of the first image frame that is different from the second backlight control signal of the second image frame, and switch the first backlight control signal The switch state of the light-emitting device corresponds to the different switch signal in the second backlight control signal. This reduces the number of light-emitting devices that need to switch the switch state each time in the pointing backlight technology, so the switching speed will become faster and not easy. This causes the problem of light-emitting devices flickering in a short period of time and improves control efficiency.

Optionally, the driving circuit is also used to read the second backlight control signal in the cache. In this optional method, the second backlight control signal is the backlight control signal of the second image frame, and the second image frame is the previous image frame of the first image frame, where the backlight control signal of the previous image frame is often retained. in the cache, so the second backlight control signal can be read from the cache.

Optionally, the driving circuit is specifically configured to simultaneously switch the switching states of the light-emitting devices corresponding to different switching signals in the first backlight control signal and the second backlight control signal under the control of the clock signal, or switch in a predetermined order. The switching states of the light-emitting devices corresponding to different switching signals in the first backlight control signal and the second backlight control signal, the predetermined sequence includes: row-by-row switching and column-by-column switching. In this optional method, the switching state of at least one light-emitting device corresponding to the switching signal can be switched simultaneously under the control of a clock signal, so that the light-emitting devices corresponding to each image frame that need to be turned on are turned on at the same time; it can also be done under the control of a clock signal. When the switching mode of the display panel is row-by-row switching, the driving circuit in the backlight module also switches the switching state of at least one light-emitting device corresponding to the switching signal row by row under the control of the clock signal; it can also be the switching mode of the display panel. When switching column by column, the driving circuit in the backlight module also switches the switching state of the light-emitting device corresponding to at least one switch signal column by column under the control of the clock signal. That is to say, the driving circuit drives and switches the switching state of the light-emitting device corresponding to at least one switching signal, and can change following the switching mode of the display panel, thereby achieving the effect of the light following the screen.

Optionally, the driving circuit is also used to determine the different switches in the first backlight control signal and the second backlight control signal. Signal.

Optionally, the driving circuit is specifically configured to perform an XOR operation on the switching states corresponding to the switching signals of the same light-emitting device in the first backlight control signal and the second backlight control signal; and determine the first backlight control signal according to the result of the XOR operation. Whether the switching signal of the same light-emitting device in the backlight control signal and the second backlight control signal are the same. In this alternative, the switch state corresponding to the switch signal of any light-emitting device is on or off. For example, the switch state is on and can be represented by a binary "1", and the switch state is off can be represented by a binary "0", so When performing an XOR operation on the switching states corresponding to the switching signals of the same light-emitting device in the first backlight control signal and the second backlight control signal, if the first backlight control signal and the same light-emitting device in the second backlight control signal If the switch states corresponding to the switch signals of the same light-emitting device in the first backlight control signal and the second backlight control signal are different, the result of the XOR operation is "0". The result is "1". Therefore, the first backlight can be determined based on the result of the Whether the switching signal of the same light-emitting device in the control signal and the second backlight control signal are the same.

A second aspect provides a display device, including a display panel and a backlight module as described in any one of the above first aspects. The light-emitting device in the backlight module generates a light beam and transmits it to the display panel, so that the first image frame Drives the display panel to display images.

Optionally, the display device also includes: an optical module located between the backlight module and the display panel; the optical module is used to transmit the light beam corresponding to the first backlight control signal generated by the light-emitting device in the backlight module through the display panel. to the left eye, transmitting the light beam corresponding to the second backlight control signal generated by the light-emitting device in the backlight module to the right eye through the display panel; or; the optical module is used to transmit the light beam generated by the light-emitting device in the backlight module corresponding to the first The light beam of the backlight control signal is transmitted to the right eye through the display panel, and the light beam corresponding to the second backlight control signal generated by the light-emitting device in the backlight module is transmitted to the left eye through the display panel. In this alternative, the display device is a display device using directional backlight technology. In directional backlight technology, the optical module mainly transmits the light beam generated by the light-emitting device in the backlight module to the left side of the observer in a directional manner. eye, or directed transmission to the observer's right eye.

Optionally, the display device also includes a human eye detection device, the human eye detection device has a field of view; a human eye detection device, used to detect the human eye position of the first observer, and generate the third human eye position according to the first observer's human eye position. A backlight control signal, the first observer's human eye is the first observer's left eye or right eye, the first observer's human eye position is determined by the angle of the first observer's human eye in the field of view, and the third The distance between an observer's human eyes and the display panel is determined. In this optional method, since the directional backlight technology needs to transmit the light beam directionally to the left eye of the observer, or transmit the light beam directionally to the right eye of the observer, it can be seen that the position of the observer's eyes needs to be obtained in order to The directional light beam is transmitted, in which the human eye of the first observer can be the left eye of the first observer or the right eye of the first observer, and the position of the human eye of the first observer can be the left eye of the first observer. The position of the eye or the position of the first observer's right eye. The position of the first observer's human eye is determined by the angle of the first observer's human eye in the field of view of the human eye detection device, and the first observer's human eye position. The distance between the eye and the display panel in the display device is determined. After determining the position of the first observer's left eye, a switching signal corresponding to each of the plurality of light-emitting devices that has a mapping relationship with the position of the first observer's left eye can be generated, that is, the first backlight control is generated signal, and then transmit the first backlight control signal to the driving circuit in the backlight module; or, after determining the position of the observer's right eye, multiple light-emitting devices that have a mapping relationship with the position of the observer's right eye can be generated The switching signal corresponding to each light-emitting device is used to generate a first backlight control signal, and then the first backlight control signal is transmitted to the driving circuit in the backlight module.

Optionally, the display device also includes a human eye detection device, the human eye detection device has a field of view; a human eye detection device, used to detect the human eye position of the first observer, and generate the third human eye position according to the first observer's human eye position. A sub-backlight control signal, the human eye of the first observer is the left eye or right eye of the first observer, and the position of the human eye of the first observer is determined by the human eye of the first observer. The angle in the field angle and the distance between the first observer's human eyes and the display panel are determined; the human eye detection device is also used to detect the position of the second observer's human eyes, and generate the third observer based on the second observer's human eye position. Second sub-backlight control signal, the second observer's human eye is the second observer's left eye or right eye, the second observer's human eye position is determined by the angle of the second observer's human eye in the field of view, and The distance between the human eyes of the second observer and the display panel is determined; the human eye detection device is also used to generate a first backlight control signal according to the first sub-backlight control signal and the second sub-backlight control signal. In this optional manner, the first observer's human eye may be the first observer's left eye or the first observer's right eye, and the first observer's human eye position may be the first observer's left eye. position or the position of the first observer's right eye, then when the position of the first observer's human eye is the position of the first observer's left eye (or the position of the first observer's right eye), it can be based on the first The position of the observer's left eye (or the position of the first observer's right eye) determines a plurality of light-emitting devices that have a mapping relationship with the position of the first observer's left eye (or the position of the first observer's eye). The switching signal corresponding to each light-emitting device generates a first sub-backlight control signal; the human eye of the second observer can be the left eye of the second observer or the right eye of the second observer. The eye position may be the position of the second observer's left eye or the position of the second observer's right eye, then the human eye position of the second observer is the position of the second observer's left eye (or the position of the second observer's right eye). When the position of the second observer's right eye), the position of the second observer's left eye (or the position of the second observer's right eye) is determined based on the position of the second observer's left eye (or the position of the second observer's right eye). position) with a switching signal corresponding to each of the multiple light-emitting devices having a mapping relationship, generating a second sub-backlight control signal, and generating a first backlight control signal based on the first sub-backlight control signal and the second sub-backlight control signal. . The first backlight control signal includes both the switching signal of the light-emitting device required to be turned on in the first sub-backlight control signal and the switching signal of the light-emitting device required to be turned on in the second sub-backlight control signal. Under the control of the first backlight control signal, the light-emitting device required to be turned on in the first sub-backlight control signal turns on to emit light and generates a light beam. The light-emitting device required to be turned on in the second sub-backlight control signal turns on to emit light and generates a light beam. The light beam will be transmitted to The optical module changes the propagation direction of the light-emitting device required to be turned on in the first sub-backlight control signal to point toward the left eye of the first observer (or the right eye of the first observer), and transmits it to display panel, and then transmitted to the left eye of the first observer (or the right eye of the first observer); the optical module changes the direction of propagation of the light-emitting device required to be turned on in the second sub-backlight control signal to turn on the light generated by the light beam. The left eye of the second observer (or the right eye of the second observer) is transmitted to the display panel, and then transmitted to the left eye of the second observer (or the right eye of the second observer); the display panel receives the first observation The display panel displays the image frame of the first observer's left eye (or the first observer's right eye) driven by the image frame of the first observer's left eye (or the first observer's right eye). The left eye image (or the first observer's right eye image), the first observer's left eye (or the first observer's right eye) views the first observer's left eye image (or the first observer's right eye image) eye image); the display panel receives the image frame of the second observer's left eye (or the second observer's right eye), and the image frame of the second observer's left eye (or the second observer's right eye) The display panel is driven to display the left eye image of the second observer (or the right eye image of the second observer), and the left eye of the second observer (or the right eye of the second observer) receives the left eye image of the second observer. image (or the second observer's right eye image). In one refresh process, two different left-eye images or two different right-eye images of different people can be displayed.

Optionally, the display device also includes a control circuit, the control circuit is connected to the display panel, and the control circuit is connected to the drive circuit in the backlight module; the control circuit is used to compare the first image frame with the second image frame to determine whether the display panel At least one pixel group in, wherein, within each pixel group in at least one pixel group, the difference between the number of assigned pixel points corresponding to the first image frame and the number of assigned pixel points corresponding to the second image frame Greater than a predetermined value; it is also used to obtain the first backlight control signal corresponding to each pixel group in at least one pixel group. In this optional method, within a pixel group, the difference between the number of assigned pixels corresponding to the first image frame and the number of assigned pixels corresponding to the second image frame is greater than a predetermined value, indicating that the pixel group The effect of the 3D image displayed inside is more prominent. It may be that the 3D image displays out-of-screen and in-screen A pixel group corresponding to the effect, then, when controlling multiple light-emitting devices, you can only obtain the first backlight control signal of the area corresponding to each pixel group in one or more pixel groups with a relatively prominent effect of the 3D image, so as to When displaying a 3D image, the driving circuit only needs to compare the backlight control signals of the light-emitting devices in the area corresponding to the pixel group with a more prominent effect in the 3D image. The number of light-emitting devices controlled will be reduced again, and the control efficiency will be improved again.

In a third aspect, a backlight control method is provided, which is applied to a display device. The display device includes a backlight module, and the backlight module includes a plurality of light-emitting devices; the method includes: acquiring a first backlight control signal of the first image frame, and a third The second backlight control signal of the two image frames, wherein the first backlight control signal includes a switching signal corresponding to each light-emitting device in the plurality of light-emitting devices; the second image frame is the previous image frame of the first image frame, and the second image frame is the previous image frame of the first image frame. The backlight control signal includes a switching signal corresponding to each light-emitting device in the plurality of light-emitting devices; switching the switching state of the light-emitting device corresponding to a different switching signal in the first backlight control signal and the second backlight control signal.

Optionally, the first image frame is a left eye image frame, the switch state corresponding to the first backlight control signal is that the light emitting device is turned on to generate a first beam, and the first beam is transmitted to the left eye; the second image frame is a right eye image frame. , the switch state corresponding to the second backlight control signal is that the light-emitting device that is turned on generates a second beam, and the second beam is transmitted to the right eye; or, the first image frame is a right eye image frame, and the switch state corresponding to the first backlight control signal is The light-emitting device that is turned on generates a first light beam, and the first light beam is transmitted to the right eye; the second image frame is an image frame for the left eye, and the switch state corresponding to the second backlight control signal is that the light-emitting device that is turned on generates a second light beam, and the second light beam is transmitted to the left eye.

Optionally, before obtaining the first backlight control signal of the first image frame and the second backlight control signal of the second image frame, it also includes: detecting the human eye position of the first observer, and The eye position generates the first backlight control signal. The human eye of the first observer is the left eye or the right eye of the first observer. The human eye position of the first observer is determined by the human eye of the first observer in the field of view. The angle and the distance between the human eye of the first observer and the display panel in the display device are determined, where the field of view angle is the field of view angle of the human eye detection device in the display device.

Optionally, before obtaining the first backlight control signal of the first image frame and the second backlight control signal of the second image frame, it also includes: detecting the human eye position of the first observer, and The eye position generates the first sub-backlight control signal. The human eye of the first observer is the left eye or right eye of the first observer. The human eye position of the first observer is determined by the human eye of the first observer in the field of view. The angle and the distance between the human eyes of the first observer and the display panel in the display device are determined, wherein the field of view angle is the field of view angle of the human eye detection device in the display device; detecting the human eye of the second observer The second sub-backlight control signal is generated according to the eye position of the second observer. The human eye of the second observer is the left eye or the right eye of the second observer. The human eye position of the second observer is determined by the second eye position. The angle of the observer's human eyes in the field of view and the distance between the second observer's human eyes and the display panel in the display device are determined; the first backlight is generated according to the first sub-backlight control signal and the second sub-backlight control signal control signal.

Optionally, obtaining the first backlight control signal of the first image frame and the second backlight control signal of the second image frame also includes: comparing the first image frame with the second image frame to determine whether At least one pixel group in the display panel, wherein in each pixel group in the at least one pixel group, the number of assigned pixel points corresponding to the first image frame and the number of assigned pixel points corresponding to the second image frame The difference in quantity is greater than a predetermined value; obtaining the first backlight control signal of the first image frame and the second backlight control signal of the second image frame specifically includes obtaining the first image frame corresponding to each pixel group in at least one pixel group. The first backlight control signal, and the second backlight control signal of the second image frame corresponding to each pixel group in at least one pixel group.

Optionally, before acquiring the first backlight control signal of the first image frame and the second backlight control signal of the second image frame, the method further includes: reading the second backlight control signal in the cache.

Optionally, switch the light emitter corresponding to the different switch signal in the first backlight control signal and the second backlight control signal. The switching state of the device specifically includes: under the control of a clock signal, simultaneously switching the switching states of the light-emitting devices corresponding to different switching signals in the first backlight control signal and the second backlight control signal, or switching the first backlight control signal in a predetermined sequence. The switching states of the light-emitting devices corresponding to different switching signals in the backlight control signal and the second backlight control signal, the predetermined sequence includes: row-by-row switching and column-by-column switching.

Optionally, after acquiring the first backlight control signal of the first image frame and the second backlight control signal of the second image frame, it further includes: determining a switch signal in the first backlight control signal that is different from the second backlight control signal. .

Optionally, determining the switch signal in the first backlight control signal that is different from the switch signal in the second backlight control signal specifically includes: switching the switch corresponding to the switch signal of the same light-emitting device in the first backlight control signal and the second backlight control signal. An XOR operation is performed on the status; according to the result of the XOR operation, it is determined whether the switching signal of the same light-emitting device in the first backlight control signal and the second backlight control signal is the same.

A fourth aspect provides a computer-readable storage medium. The computer-readable storage medium includes computer instructions. When the computer instructions are run on a computer, they cause the computer to execute the backlight control method as described in any one of the above-mentioned third aspects.

Among them, the technical effects brought about by any of the possible implementation methods of the third aspect and the fourth aspect can be referred to the technical effects brought by the different implementation methods of the first aspect or the second aspect, and will not be described again here. .

Description of drawings

Figure 1 is a schematic structural diagram of a display device provided by an embodiment of the present application;

Figure 2 is a schematic structural diagram of a display panel and a backlight module in a display device according to an embodiment of the present application;

Figure 3 is a schematic structural diagram of a light panel in a backlight module in a display panel according to an embodiment of the present application;

Figure 4 is a schematic structural diagram of a backlight module provided by an embodiment of the present application;

Figure 5 is a schematic structural diagram of a light-emitting device in a backlight module provided by an embodiment of the present application;

Figure 6 is a schematic diagram of the principle of directional backlight technology provided by another embodiment of the present application;

Figure 7 is a schematic diagram 1 of the human eye recognition principle of pointing backlight technology provided by another embodiment of the present application;

Figure 8 is a second schematic diagram of the human eye recognition principle of pointing backlight technology provided by another embodiment of the present application;

Figure 9 is a schematic diagram of the principle of directional backlight technology provided by yet another embodiment of the present application;

Figure 10 is a schematic structural diagram of a display device provided by yet another embodiment of the present application;

Figure 11 is a schematic structural diagram of a pixel group of a display panel provided by yet another embodiment of the present application;

Figure 12 is a schematic structural diagram of a light-emitting device group of a backlight module provided by yet another embodiment of the present application;

Figure 13 is a schematic flowchart of a backlight control method provided by an embodiment of the present application;

FIG. 14 is a schematic flowchart of a backlight control method provided by another embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all of the embodiments.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. In this application, "at least one" means one or more, and "plurality" means two or more. "And/or" describes the association of associated objects, indicating that there can be three relationships, for example, A and/or B, which can mean: A exists alone, A and B exist simultaneously, and B exists alone, where A, B can be singular or plural. The character "/" generally indicates that the related objects are in an "or" relationship. "At least one of the following" or similar expressions thereof refers to any combination of these items, including any combination of a single item (items) or a plurality of items (items). For example, at least one of a, b or c An item (item) can represent: a, b, c, a and b, a and c, b and c or a, b and c, where a, b and c can be single or multiple. In addition, in the embodiments of the present application, words such as “first” and “second” do not limit the number and order.

In addition, in this application, directional terms such as "upper" and "lower" are defined relative to the schematically placed directions of the components in the drawings. It should be understood that these directional terms are relative concepts and they are used relative to each other. The descriptions and clarifications may change accordingly according to the changes in the orientation of the components in the drawings.

It should be noted that in this application, words such as “exemplary” or “for example” are used to represent examples, illustrations or explanations. Any embodiment or design described herein as "exemplary" or "such as" is not intended to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the words "exemplary" or "such as" is intended to present the concept in a concrete manner.

The technical solutions in this application will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic structural diagram of a display device 10 provided by an embodiment of the present application. The display device 10 may be an advertising screen (billboard), a monitor, a 3D display, a television (such as a smart screen), a laptop, a tablet, a vehicle-mounted device, or other large-screen display device. Optionally, in some scenarios, the display device 10 may be a mobile phone, an e-reader, or a wearable device. The display device 10 shown in FIG. 1 is explained using a display as an example.

The display device 10 may include a housing 11 and a display panel 22 . Of course, FIG. 1 shows only an example of the display device 10, and this example does not limit the structure of the display device 10. In other examples, the display device 10 may also include more structures or components.

The housing 11 may include a frame and a back cover. The frame can surround the periphery of the back cover. The housing 11 may include, for example, a middle frame of the display device 10 . In one example, the middle frame of the display device 10 may be accommodated within the inner periphery of the frame. In another example, the middle frame of the display device 10 may serve as a border of the housing 11 . The display panel 22 may provide a display function for the display device 10 . The user can watch the display panel 22 to enjoy media resources such as images and videos. The display panel 22 can be installed on the housing 11 . The peripheral edge of the display panel 22 may abut against the inner edge of the frame. The frame can fix the display panel 22 on the housing 11 . The display panel 22 and the back cover can be installed on both sides of the frame respectively, so that the housing 11 can provide mechanical protection for the components inside the display device, especially the components on the display panel 22 . For example, the display panel 22 may be fixed on the middle frame of the display device 10 .

Display device 10 may also include control circuitry. Specific implementation forms of the control circuit may include, for example, a processor, a controller, a connector, a drive board, an integrated circuit, a chip, a power board, etc. The control circuit can be accommodated in the housing 11 . In one example, the control circuit may include at least one communication interface, a bus, at least one processor, and at least one memory. At least one communication interface, at least one processor and at least one memory can communicate with each other via a bus. At least one communication interface can be used to receive and send signals. For example, the light-emitting device of the display panel 22 can be connected to one of the communication interfaces, so that the control circuit can trigger the light-emitting device to turn on and emit light. At least one memory is used to store application code. The application code may include, for example, code that controls the light emitting device to turn on or off to emit light. At least one processor can be used to execute the above application code to control the light-emitting device. In this application, "at least one" includes, for example, one or more of both situations.

Among them, a backlight module is also provided on one of the display panels 22 close to the back cover of the display device.

The following describes the backlight module 21 and the display panel 22 in the display device 10 provided by the embodiment of the present application with reference to FIG. 2 . FIG. 2 shows the backlight module 21 and the display panel 22 provided on the light exit side of the backlight module 21 . The backlight module 21 may include a stacked back plate 211, a flat plate 212, a light plate 213, a diffusion plate 214, an optical film 215 and other components. Of course, the above figure 2 only provides an exemplary general structure of the backlight module 21. In some examples, the backlight module 21 There may be more or fewer components than listed above.

The backplane 211 may have functions such as supporting the display device 10 and providing mechanical protection for electronic components in the display device 10 . The material of the back plate 211 can be a material that meets mechanical strength requirements and can play a supporting role. For example, the back plate 211 may be made of metal materials such as stainless steel, aluminum alloy, zinc alloy, or titanium alloy, or the back plate 211 may be made of non-metal materials such as resin.

The flat plate 212 may be located between the light panel 213 and the back panel 211 . The flat plate 212 can be used to provide support for the light panel 213 to maintain or ensure the flatness of the light panel 213. The flat plate 212 may be a conductive material with certain stiffness. For example, the flat plate 212 may be an aluminum plate. The flat plate 212 can be fixed on the back plate 211 through mechanical connectors such as double-sided tape or foam.

The optical film 215 can change the frequency of light from the light panel 213. Optical film 215 may include quantum dots. For example, the lamp panel 213 can emit high-energy blue light; the blue light can excite the quantum dots encapsulated in the optical film 215, so that the quantum dots can convert the blue light emitted by the lamp panel 213 into white light (the quantum dot can be a nano-scale Semiconductor; by applying a certain electric field or light pressure to the quantum dots, the quantum dots can emit light of a specific frequency). Quantum dots can be formed in chemical coatings, phosphors, etc., for example.

In other examples, the diffusion plate 214 may include quantum dots, so the diffusion plate 214 may change the frequency of light from the light panel 213 . In some embodiments, the diffusion plate 214 may be integrally formed with the optical film 215 . The light emitted by the lamp panel 213 may only undergo light mixing processing without other optical processing, and directly enter the diffusion plate 214 .

Specifically, the light emitted by the light panel 213 is transmitted to the display panel 22 through the diffusion plate 214 and the optical film 215 . The display panel 22 may be a liquid crystal display (LCD). The display panel 22 may include a liquid crystal layer and a filter layer. The display panel 22 is also called a liquid crystal panel. The liquid crystal in the liquid crystal layer can control the liquid crystal unit to turn on or off to control the intensity of white light passing through the liquid crystal unit. By turning on the liquid crystal unit, the white light passing through the liquid crystal unit can illuminate the filter layer. The filter layer may include a red light filter, a green light filter, and a blue light filter. Red light filters can be used to convert white light to red light. Green light filters can be used to convert white light into green light. Blue light filters can be used to convert white light to blue light. Thus, the display device 10 can be controlled to emit light of multiple colors to display color patterns. Among them, a predetermined number of liquid crystal units form a pixel, and a pixel value can be assigned to each pixel so that the current pixel displays different colors. The pixel value can be the gray value of the current pixel or the red color of the current pixel. The chromaticity value of the three colors red green blue (RGB).

For example, referring to FIG. 3 , the light panel 213 may be provided with a plurality of light-emitting devices L arranged in an array. The light-emitting device L may be a chip with a light-emitting function, or the light-emitting device L may be a light-emitting diode (LED). The light board 213 also includes a driving circuit connected to a plurality of light-emitting devices. The driving circuit is used to Obtain a backlight control signal including multiple switch signals. The multiple switch signals in the backlight control signal are used to control the switch states of multiple light-emitting devices provided on the light panel 213. For example, when the switch state corresponding to the switch signal is binary "1" ", it means that the light-emitting device is controlled to be turned on and the light-emitting device emits light; when the switch state corresponding to the switch signal is binary "0", the light-emitting device is controlled to be turned off and the light-emitting device does not emit light. Among them, the driving circuit controls the light-emitting device L whose switch state is binary "1" corresponding to the switch signal according to the backlight control signal to turn on the light, that is, the turned-on light-emitting device L generates a light beam. In subsequent embodiments, the light beam will be used to represent the light emitted by the light-emitting device. of light, wherein the light beam generated by the turned-on light-emitting device L will be transmitted to the display panel 22 .

The display panel 22 also receives image frames, which are also image signals. Each image frame corresponds to a backlight control signal. The image frame may be an image frame generated by the processor in the display device 10 . The control circuit is transmitted to the display panel 22. The image frame is used to control the opening or closing of the liquid crystal unit on the display panel 22. That is, the image frame is used to control the pixel value of the pixel point on the display panel 22. Therefore, during the driving of the image frame down, the display panel displays image.

When the display panel displays images corresponding to two adjacent image frames, the two adjacent image frames are transmitted to the display panel 22 respectively, and the light beams required for the two adjacent image frames also need to be transmitted to the display panel respectively. twenty two. Among them, the light beams required for two adjacent image frames may be different, so it is necessary to control the different light-emitting devices in the backlight module to turn on to generate different light beams. Specifically, when displaying the image corresponding to the latter image frame among the two adjacent image frames, the backlight module is usually first controlled to turn on the light-emitting device corresponding to the previous image frame among the two adjacent image frames. First turn it off, and then control to turn on the light-emitting device corresponding to the latter of the two adjacent image frames. The control complexity is high, and it often traverses the switching status of all the light-emitting devices, and then turns it off and on. Light-emitting devices, when the number of light-emitting devices on the light board increases, the control delay will also increase.

Among them, in the field of 3D technology, the control complexity of the above-mentioned backlight module will be further intensified. Specifically, 3D technology is based on the principle of visual difference of the observer's eyes, and uses certain optical technology to enable the observer to observe 3D images. 3D technology is divided into two categories: glasses-type 3D technology and naked-eye 3D technology. Glasses-type 3D technology mainly enables the observer to wear lenses with different polarization states for the left and right eyes, thereby allowing the observer's left and right eyes to receive different images. The purpose of observing 3D images.

Compared with glasses-based 3D technology, the advantage of naked-eye 3D technology is that it does not require the use of glasses. At present, directional backlight technology in naked-eye 3D technology has attracted much attention. In directional backlight technology, when displaying a 3D image, the left eye image is often displayed first, and then the right eye image is displayed. If the display time of the left eye image and the right eye image is The interval is relatively small. The observer's left eye receives the left eye image, and the observer's right eye receives the right eye image. Based on the principle of persistence of vision, the observer's eyes are equivalent to receiving the left eye image and the right eye image at the same time, and There is parallax information between the left eye image and the right eye image received by the observer. The observer fuses the left eye image and the right eye image in his brain, then performs depth reconstruction, and finally stereoscopic imaging, so that the observer can view the stereoscopic image. image.

More specifically, in order to enable the observer to view a stereoscopic image, the previous image frame of the two adjacent image frames displayed in the directional backlight technology corresponds to the left eye image frame, and the latter of the two adjacent image frames is displayed. The image frame corresponds to the right eye image frame. Two adjacent image frames are transmitted to the display panel respectively, and the light beams required for the two adjacent image frames also need to be transmitted to the display panel respectively. Among them, since there is a predetermined distance between the observer's left eye and right eye, the light beams required for two adjacent image frames are different, so it is necessary to control the different light-emitting devices in the backlight module to turn on to generate different light beams. For example, when the backlight module is the one shown in Figure 2 and the light board included in the backlight module is provided with a light-emitting device 1, a light-emitting device 2, a light-emitting device 3 and a light-emitting device 4, the left eye image corresponding to The light-emitting devices that need to be turned on include light-emitting device 1, light-emitting device 2 and light-emitting device 3. The light-emitting devices that need to be turned on to display the right eye image include light-emitting device 2, light-emitting device 3 and light-emitting device 4. Then when displaying the right eye image, the backlight module is often controlled to first turn off the light-emitting device 1, the light-emitting device 2 and the light-emitting device 3 on the lamp board, and then turn off the light-emitting device 2, the light-emitting device 3 and the light-emitting device 4 on the lamp board. When turned on, not only is the control complexity high, but it will also cause the light-emitting device 2 and the light-emitting device 3 to flash in a short period of time, affecting the viewing experience.

Therefore, embodiments of the present application provide a backlight module whose control complexity is lower than that of existing backlight modules, and the number of controlled light-emitting devices is relatively small, and the control efficiency is high. . Referring to FIG. 4 , a backlight module 40 is applied to a display device. The backlight module 40 includes a plurality of light-emitting devices (such as the light-emitting device L1 , the light-emitting device L2 , the light-emitting device L3 and the light-emitting device L4 shown in FIG. 4 ) and multiple light-emitting devices. A driving circuit 42 connected to a light-emitting device. Among them, multiple light-emitting devices are often arranged on the lamp panel 41 and are distributed in an array on the lamp panel 41. As shown in Figure 4, the light-emitting device L1 and the light-emitting device L2 are located in the same row, and the light-emitting device L3 and the light-emitting device L4 are located in the same row. , the light-emitting device L1 and the light-emitting device L3 are located in the same column, and the light-emitting device L2 and the light-emitting device L4 are located in the same column. The light-emitting device may be a chip with a light-emitting function, or the light-emitting device may be an LED. For the following explanation, the light-emitting device is an LED.

Specifically, taking the light-emitting device L1 as an example, any light-emitting device can be a single LED. Referring to (a) in Figure 5, the light-emitting device L1 includes an LED. In the switching state corresponding to the switching signal received by the light-emitting device L1 When the binary value is "1", the LED is turned on to emit light. When the switch state corresponding to the switch signal received by the light-emitting device L1 is the binary value "0", the LED is turned off and does not emit light. Alternatively, any light-emitting device can be a string of LEDs. Referring to (b) in Figure 5, the light-emitting device L1 includes a string of 4 LEDs. The switching state corresponding to the switching signal received by the light-emitting device L1 is a binary value. 1", the four LEDs are all turned on and emit light. When the switch state corresponding to the switch signal received by the light-emitting device L1 is the binary value "0", the four LEDs are all turned off and do not emit light. Alternatively, any light-emitting device can be a set of LEDs distributed in an array. Referring to (c) in Figure 5, the light-emitting device L1 includes a 2*2 array of LEDs. The switch corresponding to the switch signal received by the light-emitting device L1 When the state is a binary value "1", the LEDs distributed in the 2*2 array are all turned on and emit light. When the switch state corresponding to the switch signal received by the light-emitting device L1 is a binary value "0", the LEDs distributed in the 2*2 array All are closed and do not emit light. The embodiments of the present application do not limit the number of LEDs included in the light-emitting device and the arrangement of the LEDs.

In other embodiments, when the switch state corresponding to the switch signal received by the light-emitting device L1 is a binary value "0", the light-emitting device L1 turns on to emit light, and when the switch state corresponding to the switch signal received by the light-emitting device L1 When it is a binary value "1", the light-emitting device L1 is turned off and does not emit light. Or, when the switch state corresponding to the switch signal received by the light-emitting device L1 is a binary value "10", the light-emitting device L1 turns on to emit light, and when the switch state corresponding to the switch signal received by the light-emitting device L1 is a binary value "01", The light-emitting device L1 is turned off and does not emit light. The embodiments of the present application do not limit the specific representation form of the switch state corresponding to the switch signal. In the subsequent description, when the switch state corresponding to the switch signal received by the light-emitting device L1 is a binary value "1", the light-emitting device L1 When the light-emitting device L1 is turned on and the switch state corresponding to the switch signal received by the light-emitting device L1 is a binary value "0", the light-emitting device L1 is turned off and does not emit light for the purpose of illustration.

Wherein, the driving circuit 42 is used to obtain the first backlight control signal of the first image frame and the second backlight control signal of the second image frame. The first backlight control signal includes a signal corresponding to each light-emitting device in the plurality of light-emitting devices. switching signal, the second image frame is the previous image frame of the first image frame, the second backlight control signal includes a switching signal corresponding to each light-emitting device in the plurality of light-emitting devices; switching the first backlight control signal and the second backlight The switching states of the light-emitting devices correspond to different switching signals in the control signal. Among the first backlight control signal and the second backlight control signal, one switching signal correspondingly controls the switching state of one light-emitting device.

Specifically, referring to FIG. 4 , the two adjacent image frames are the first image frame and the second image frame, and the second image frame is the previous image frame of the first image frame. When the backlight module 40 needs to display When the image corresponds to the first image frame, the driving circuit 42 in the backlight module 40 needs to obtain the first backlight control signal of the first image frame, and the driving circuit 42 controls the light emission corresponding to the first image frame according to the first backlight control signal. The switching state of the device, so that the light-emitting device whose switching state is on emits light. Referring to Figure 4, the multiple light-emitting devices in Figure 4 are described by taking four light-emitting devices as an example. Then, the first backlight signal includes a switching signal corresponding to each of the four light-emitting devices, and, When displaying the image corresponding to the first image frame, the light-emitting device L2 and the light-emitting device L4 need to be turned on, and the light-emitting device L1 and the light-emitting device L3 need to be turned off. Then, the switching states of the light-emitting devices corresponding to the four switching signals included in the first backlight control signal may exist in the form of a matrix, for example, B=(0,1,0,1), where each element in the matrix represents a The switch status of the light-emitting device, "0" indicates that the switch status is on, "1" indicates that the switch status is off. Among them, the first element "0" in matrix B=(0,1,0,1) corresponds to the light-emitting device L1, indicating that the light-emitting device L1 is turned off when displaying the image corresponding to the first image frame; matrix B=(0, The second element "1" in 1,0,1) corresponds to the light-emitting device L2, indicating that the light-emitting device L2 is turned on when displaying the image corresponding to the first image frame; the matrix B=(0,1,0,1) The third element "0" corresponds to the light-emitting device L3, indicating that the light-emitting device L3 is turned off when displaying the image corresponding to the first image frame; the fourth element "1" in the matrix B=(0,1,0,1) corresponds to glow Device L4 means that the light-emitting device L4 is turned on when displaying the image corresponding to the first image frame. That is to say, the first backlight control signal includes the switching signal of each of the plurality of light-emitting devices, and the order of the switching signals in the first backlight control signal is consistent with the order of the plurality of light-emitting devices arranged on the lamp panel 41 . Depends on the order.

In other embodiments, the switching states of the light-emitting devices corresponding to the four switching signals included in the first backlight control signal can also be represented by a 2*2 matrix, for example Among them, matrix The element "0" in the first row and first column corresponds to the light-emitting device L1, matrix The element "1" in the first row and second column corresponds to the light-emitting device L2, matrix The element "0" in the second row and first column corresponds to the light-emitting device L3, matrix The element "1" in the second row and second column corresponds to the light-emitting device L4.

It should be noted that the embodiments of the present application do not limit the representation form of the switching states of the light-emitting devices corresponding to the multiple switching signals in the first backlight control signal. However, the first backlight control signal includes the switching states of the multiple light-emitting devices. There is a switching signal corresponding to each light-emitting device, and the order of the switching signals in the first backlight control signal is related to the order of each light-emitting device in the plurality of light-emitting devices on the lamp board.

For example, when displaying the image corresponding to the first image frame, the light-emitting device L2 and the light-emitting device L4 need to be turned on, and the light-emitting device L1 and the light-emitting device L3 need to be turned off. When displaying the previous image frame of the first image frame, that is, the image corresponding to the second image frame, the light-emitting device L1 and the light-emitting device L2 are turned on, and the light-emitting device L3 and the light-emitting device L4 are turned off, wherein the third image frame of the second image frame is The second backlight control signal also includes the switching states "1", "1", "0", and "0" corresponding to the switching signals of the light-emitting device L1, the light-emitting device L2, the light-emitting device L3, and the light-emitting device L4. Among them, the switching states of the light-emitting devices corresponding to the four switching signals in the second backlight control signal can also be represented by a matrix, for example, A=(1,1,0,0), where the matrix A=(1,1,0, The elements in 0) represent the switching states of the light-emitting device L1, the light-emitting device L2, the light-emitting device L3, and the light-emitting device L4 in order from left to right. That is to say, the second backlight control signal includes a switching signal corresponding to each of the plurality of light-emitting devices, and the order of the switching signals in the second backlight control signal is consistent with that of each of the plurality of light-emitting devices. It depends on the order on the light board. More specifically, in the embodiment of the present application, the light-emitting device corresponding to the n-th switch signal in the first backlight control signal and the n-th switch signal in the second backlight control signal is the same, n∈[1,4] .

The driving circuit 42 acquires the second backlight control signal of the second image frame. Specifically, in the display device where the backlight module 40 is applied, the backlight control signal of the second image frame will be retained in the cache of the memory of the display device. Therefore, the driving circuit 42 can read the second backlight control signal from the cache.

After the driving circuit 42 acquires the first backlight control signal and the second backlight control signal, optionally, the driving circuit determines a different switch signal in the first backlight control signal and in the second backlight control signal. Specifically, the switching states of the light-emitting devices corresponding to the four switching signals in the first backlight control signal of the first image frame are matrix B=(0,1,0,1), where the elements in matrix B are from left to The order on the right sequentially represents the switching states of the light-emitting device L1, the light-emitting device L2, the light-emitting device L3 and the light-emitting device L4; the switching states of the light-emitting devices corresponding to the four switching signals in the second backlight control signal of the second image frame are matrix A. =(1,1,0,0), where the elements in matrix A represent the switching states of the light-emitting device L1, the light-emitting device L2, the light-emitting device L3 and the light-emitting device L4 in order from left to right. By comparing matrix A and matrix B, different switching signals in the first backlight control signal and the second backlight control signal can be determined. The different switching signals are the switching signals corresponding to the light-emitting device L1 and the switching signals corresponding to the light-emitting device L4.

More specifically, the driving circuit 42 determines the switching signals in the first backlight control signal that are different from the switching signals in the second backlight control signal, which may be that the driving circuit 42 determines the switching states of the light-emitting devices corresponding to the four switching signals in the first backlight control signal. The same matrix A of the switching state of the light-emitting device corresponding to the four switching signals in the second backlight control signal in the matrix B=(0,1,0,1)=(1,1,0,0) The switching status corresponding to the switching signal of the light-emitting device is XORed. According to the XORed As a result, it is determined whether the switching signal of the same light-emitting device in the first backlight control signal and the second backlight control signal is the same. Among them, the result of the XOR operation is "0", which means the same, and the result of the XOR operation is "1", which means they are different. That is to say, the first element "0" in matrix B performs an XOR operation with the first element "1" in matrix A. The result of the XOR operation is "1", which means that the first backlight control signal and the second The switching signal corresponding to the light-emitting device L1 in the backlight control signal is different; the second element "1" in matrix B performs an XOR operation with the second element "1" in matrix A, and the result of the XOR operation is "0" It means that the switching signal corresponding to the light-emitting device L2 in the first backlight control signal and the second backlight control signal is the same; the third element "0" in matrix B performs an XOR operation with the third element "0" in matrix A, The result of the XOR operation is "0", which means that the switching signal corresponding to the light-emitting device L3 in the first backlight control signal and the second backlight control signal are the same; the fourth element "1" in matrix B is the same as the fourth element "1" in matrix A. The element "0" performs an XOR operation, and the result of the XOR operation is "1" indicating that the switching signals corresponding to the light-emitting device L4 in the first backlight control signal and the second backlight control signal are different. Therefore, it is also possible to determine different switching signals in the first backlight control signal and in the second backlight control signal, and the different switching signals are the switching signals corresponding to the light-emitting device L1 and the switching signals corresponding to the light-emitting device L4.

The driving circuit 42 is used to switch the switching state of the light-emitting device corresponding to different switching signals in the first backlight control signal and the second backlight control signal, wherein in determining the first backlight control signal and the second backlight control signal, The different switching signals are the switching signal corresponding to the light-emitting device L1 and the switching signal corresponding to the light-emitting device L4. Then, the driving circuit 42 will switch the switching state of the light-emitting device L1, specifically changing the switching state of the light-emitting device L1 from on to off. The driving circuit 42 also switches the switching state of the light-emitting device L4, specifically changing the switching state of the light-emitting device L4 from off to on.

Exemplarily, the driving circuit 42 is specifically configured to simultaneously switch the switching states of the light-emitting devices corresponding to different switching signals in the first backlight control signal and the second backlight control signal under the control of the clock signal, or switch in a predetermined sequence. The switching states of the light-emitting devices corresponding to different switching signals in the first backlight control signal and the second backlight control signal, the predetermined sequence includes: row-by-row switching and column-by-column switching. Among them, the driving circuit 42 simultaneously switches the switching states of the light-emitting devices corresponding to different switching signals in the first backlight control signal and the second backlight control signal under the control of the clock signal, so that the switches corresponding to the light-emitting device L1 and the light-emitting device L2 The state is switched to turn on the light-emitting device L2 and the light-emitting device L4, and to turn off the light-emitting device L1 and the light-emitting device L3. Alternatively, when the switching mode of the display panel is line-by-line switching, for example, when switching line-by-line in order from top to bottom, the driving circuit 42 also switches the first backlight control signal and the second backlight control signal line-by-line under the control of the clock signal. Different switching signals in the two backlight control signals correspond to the switching status of the light-emitting device, that is, first switch the switching status of the light-emitting device L1 so that the light-emitting device L2 in the first row from top to bottom is turned on, and the light-emitting device L1 is turned off, and then Switch the switching state of the light-emitting device L4 so that the light-emitting device L4 in the second row from top to bottom is turned on and the light-emitting device L3 is turned off. Alternatively, when the switching mode of the display panel is column-by-column switching, for example, when switching column-by-column in order from left to right, the driving circuit 42 also switches the first backlight control signal and the first backlight control signal column-by-column under the control of the clock signal. Different switching signals in the two backlight control signals correspond to the switching status of the light-emitting device, that is, first switch the switching status of the light-emitting device L1 so that the light-emitting device L1 and the light-emitting device L3 in the first column from left to right are both turned off, and then Switch the switch state of the light-emitting device L4 so that both the light-emitting device L2 and the light-emitting device L4 in the second row from left to right are turned on. That is to say, the driving circuit drives and switches the switching state of the light-emitting device corresponding to different switching signals in the first backlight control signal and the second backlight control signal, and can change according to the switching mode of the display panel, achieving the effect of the light following the screen.

In the above-mentioned backlight module, the driving circuit can obtain the first backlight control signal of the first image frame and the second backlight control signal of the second image frame, and the second image frame is the previous one of the first image frame. image frame, after the driving circuit obtains the first backlight control signal and the second backlight control signal, the driving circuit can switch the switching state of the light-emitting device corresponding to the different switching signals in the first backlight control signal and the second backlight control signal. . The switching signal in the first backlight control signal that is different from the second backlight control signal is the basis of the switching states of all light-emitting devices corresponding to the second image frame. Basically, the light-emitting devices that need to be switched on and off are switched, and the switching states of these light-emitting devices that need to be switched on and off are the switching states of all the light-emitting devices corresponding to the first image frame. Therefore, the driving circuit switches the switching states of the light-emitting devices corresponding to different switching signals in the first backlight control signal and the second backlight control signal, so that when switching between two adjacent image frames, there is no need to switch all the light-emitting devices first. To turn off and then turn on the corresponding light-emitting device, it is only necessary to switch the switching state of the light-emitting device that needs to be switched under the action of different switching signals in the first backlight control signal and the second backlight control signal, so that the switching state of the light-emitting device that needs to be refreshed is The number of light-emitting devices is reduced, so that the control complexity of the backlight module is reduced.

In other embodiments, as shown in FIG. 6 , embodiments of the present application provide a display device 100 corresponding to directional backlight technology. The display device 100 includes a backlight module 40 and a display panel 22 , and also includes a backlight module 40 and a display panel 22 . The optical module 60 is between the display panel 22 and the display panel 22 . The optical module 60 includes a Fresnel lens, a cylindrical lens, etc., and is used to change the direction of the light emitted through the optical module 60 . For example, the optical module 60 uses The light beam generated by the light-emitting device in the backlight module 40 is transmitted through the display panel 22 to the left eye e1 of the first observer or the right eye e2 of the first observer.

For directional backlight technology, the switching method of image frames is left eye image frame, right eye image frame, left eye image frame, right eye image frame..., then, the backlight module 40 in the display device 100, its backlight control The signal switching method is the backlight control signal of the left eye image frame, the backlight control signal of the right eye image frame, the backlight control signal of the left eye image frame, the backlight control signal of the right eye image frame...

Wherein, the first image frame may be a left-eye image frame, the first backlight control signal is the backlight control signal of the left-eye image frame, and the switch state corresponding to the first backlight control signal is that the light-emitting device that is turned on generates the first light beam, and the first light beam Transmitted to the left eye; the second image frame may be a right eye image frame, the second backlight control signal is the backlight control signal of the right eye image frame, and the switch state corresponding to the second backlight control signal is that the light-emitting device that is turned on generates the second light beam, The second beam is transmitted to the left eye.

Alternatively, the first image frame may be a right-eye image frame, and the first backlight control signal is the backlight control signal of the right-eye image frame. The switch state corresponding to the first backlight control signal is that the light-emitting device that is turned on generates the first light beam. Transmitted to the right eye; the second image frame can be the left eye image frame, the second backlight control signal is the backlight control signal of the left eye image frame, and the switch state corresponding to the second backlight control signal is that the light-emitting device that is turned on generates the second light beam, The second beam is transmitted to the left eye.

For example, the observer in Figure 6 is a first observer, the first observer's left eye e1 receives the left eye image, and the first observer's right eye e2 receives the right eye image. For the first observer, for example, the three adjacent frames are the right eye image frame, the left eye image frame, and the right eye image frame, and the corresponding three adjacent backlight control signals are the backlight control of the right eye image frame. Signal 0, backlight control signal 1 of the left eye image frame, and backlight control signal 2 of the right eye image frame. That is to say, the driving circuit 42 in the backlight module 40 in the display device 100 obtains the backlight control signal 1 and the backlight control signal 0. The backlight control signal 1 includes the switching signal corresponding to each light-emitting device in the plurality of light-emitting devices, The backlight control signal 0 includes a switching signal corresponding to each of the plurality of light-emitting devices; switching the switching state of the light-emitting device corresponding to a different switching signal in the backlight control signal 1 is switched. The light-emitting device whose switch state is on among the plurality of light-emitting devices corresponding to the backlight control signal 1 generates the light beam 1 , and the light beam 1 is transmitted to the optical module 60 . The optical module 60 is used to change the propagation direction of the light beam 1, for example, change the propagation direction of the light beam 1 to point to the left eye e1 of the first observer, transmit it to the display panel 22, and then transmit it to the right eye e2 of the first observer. , that is to say, the optical module 60 transmits the light beam 1 corresponding to the backlight control signal 1 generated by the light-emitting device in the backlight module 40 to the left eye e1 of the first observer through the display panel 22 . The display panel 22 is used to receive the left eye image frame when the optical module 60 changes the propagation direction of the light beam 1 to point to the left eye e1 of the first observer. The display panel 22 displays the left eye image frame driven by the left eye image frame. image so that the left eye e1 of the first observer receives the left eye image.

Then, the driving circuit 42 in the backlight module 40 in the display device 100 obtains the backlight control signal 2, and the backlight The control signal 1 and the backlight control signal 2 include a switching signal corresponding to each of the plurality of light-emitting devices. The backlight control signal 1 includes a switching signal corresponding to each of the plurality of light-emitting devices; switching the backlight control signal 2 The switching state of the light-emitting device corresponding to different switching signals in the backlight control signal 1. The light-emitting device whose switch state is on among the plurality of light-emitting devices corresponding to the backlight control signal 2 generates the light beam 2 , and the light beam 2 is transmitted to the optical module 60 . The optical module 60 is used to change the propagation direction of the light beam 2, for example, change the propagation direction of the light beam 2 to point toward the right eye e2 of the first observer, transmit it to the display panel 22, and then transmit it to the right eye e2 of the first observer. , that is to say, the optical module 60 transmits the light beam 2 corresponding to the backlight control signal 2 generated by the light-emitting device in the backlight module 40 to the right eye e2 of the first observer through the display panel 22 . The display panel 22 is used to receive the right eye image frame when the optical module 60 changes the propagation direction of the light beam 2 to point to the right eye e2 of the first observer. The display panel 22 displays the right eye image frame driven by the right eye image frame. image so that the right eye e2 of the first observer receives the right eye image.

When the display time interval between the left eye image and the right eye image is relatively small, the observer's left eye receives the left eye image, and the observer's right eye receives the right eye image. Based on the principle of persistence of vision, the observer's eyes are equivalent to simultaneously The left eye image and the right eye image are received, and there is disparity information between the left eye image and the right eye image received by the observer. The observer performs image fusion on the left eye image and the right eye image in his brain, and then performs depth reconstruction. , and finally stereoscopic imaging, allowing the observer to view a stereoscopic image.

In directional backlight technology, the backlight control signals of dozens of adjacent image frames or even hundreds of image frames are closely related, and the switching speed is very fast, then according to the first backlight control signal of the first image frame and Compare the second backlight control signal of the second image frame, and switch the switch state of the light-emitting device corresponding to the different switch signal in the first backlight control signal and the second backlight control signal. This makes it necessary to switch the switch each time in the pointing backlight technology. The number of light-emitting devices in the state is reduced, so the switching speed will be faster, and it will not easily cause the problem of light-emitting devices flickering in a short time, improving control efficiency.

Since observers at different positions can view different images, when the display panel 22 shown in FIG. 6 needs to display a predetermined 3D image to observers at a predetermined position, a human eye detection device is often provided on the display panel 22 The human eye detection device includes one or more cameras arranged on the display panel 22. For example, as shown in Figure 6, the human eye detection device is arranged in the middle of the display panel 22. The human eye detection device may be a binocular camera. The human eye detection device may be a binocular camera. The detection device has a field of view; the human eye detection device is used to detect the human eye position of the first observer, and generate the first backlight control signal according to the human eye position of the first observer, and the human eye of the first observer is the first The observer's left eye or right eye, the first observer's human eye position is determined by the angle of the first observer's human eye in the field of view, and the first observer's human eye and the display panel 22 in the display device 100 The distance is determined.

For example, as shown in FIG. 7 , the human eye detection device 44 is disposed in the middle of the display panel 22 . The human eye detection device 44 detects the position of the first observer's human eyes, and the human eye detection device 44 itself does not rotate. The human eye of the first observer may be the left eye e1 of the first observer or the right eye e2 of the first observer. The position of the human eye of the first observer is the position of the left eye e1 of the first observer or the first human eye of the first observer. The position of the observer's right eye e2. When the human eye detection device 44 detects the position of the first observer's left eye e1, the human eye detection device 44 emits light in a predetermined direction to detect the first observer's left eye. The distance between e1 and the display panel 22 is s1. The predetermined direction forms an angle β with the angular bisector of the field of view α of the human eye detection device 44, and the angular bisector of the field of view α of the human eye detection device 44 is in contact with the display panel. The angle between 22 is γ. Then, based on the above-mentioned distance s1 and the difference of γ-β, the vertical distance between the first observer's left eye e1 and the display panel 22 can be calculated.

The position of the first observer's right eye e2 is measured in a similar manner as above, and, in order to ensure the accuracy of the detection, the position of the first observer's left eye e1 is often detected within a short period of time. The position of the observer's right eye e2, for example, take an image of the first observer and then measure the position of the first observer's left eye e1 in the image of the first observer. The position is the same as the position of the first observer's right eye e2.

Alternatively, as shown in FIG. 8 , the human eye detection device 44 is disposed in the middle of the display panel 22 . The human eye detection device 44 detects the position of the first observer's human eyes, and the human eye detection device 44 rotates. The first observer's human eye may be the first observer's left eye e1 or the first observer's right eye e2, and the first observer's human eye position may be the position of the first observer's left eye e1 or the first observer's right eye e2. The position of the observer's right eye e2. When the human eye detection device 44 detects the position of the first observer's left eye e1, the human eye detection device 44 emits light in a predetermined direction and measures the distance of the observer's left eye e1. The distance between the display panel 22 is s1, and the predetermined direction is the direction of the angular bisector of the visual field angle α of the human eye detection device, that is, the human eye detection device 44 rotates the angular bisector of the visual field angle α to point to the first observation The angle bisector of the viewing angle α of the human eye detection device 44 and the display panel is γ. Then, based on the difference between the above distance s1 and γ, the vertical distance between the first observer's left eye e1 and the display panel 22 can be calculated.

The position of the first observer's right eye e2 is measured in a similar manner as above.

Among them, the camera in the human eye detection device 44 can be a binocular camera or two monocular cameras. For distance measurement of the binocular camera or two monocular cameras, refer to the content in the prior art and will not be described again here.

For example, the light panel in the backlight module 40 is provided with four light-emitting devices as shown in FIG. 4 , namely the light-emitting device L1 , the light-emitting device L2 , the light-emitting device L3 and the light-emitting device L4 , wherein the first observer The position of the human eye may be the position of the first observer's left eye e1, and there is a mapping relationship between the position of the first observer's left eye e1 and the turning on of the light-emitting device L1 and the light-emitting device L2, and the turning off of the light-emitting device L3 and the light-emitting device L4, Then the switching states of the light-emitting devices corresponding to the four switching signals in the backlight control signal 1 of the left eye image of the first observer are B=(1,1,0,0). The elements in B=(1,1,0,0) are the switching states of the light-emitting device L1, the light-emitting device L2, the light-emitting device L3 and the light-emitting device L4 in order from left to right.

And the human eye detection device detects the position of the first observer's right eye e2, and there is a mapping relationship between the position of the first observer's right eye e2 and the turning on of the light-emitting device L3 and the light-emitting device L4, and the turning off of the light-emitting device L1 and the light-emitting device L2, Then the switching states of the light-emitting devices corresponding to the four switching signals in the backlight control signal 2 of the first observer's right eye image are B=(0,0,1,1). The elements in B=(0,0,1,1) are the switching states of the light-emitting device L1, the light-emitting device L2, the light-emitting device L3 and the light-emitting device L4 in order from left to right.

In other embodiments, as shown in FIG. 9 , two observers may watch the 3D image at the same time, where the first observer's left eye e1 and right eye e2 and the second observer's left eye e3 and right eye e4 , when two observers watch a 3D image at the same time, the left eye image of the first observer, the right eye image of the first observer, the left eye image of the second observer, and the left eye image of the second observer can be displayed as follows. The right eye image of the first observer, the left eye image of the first observer, the right eye image of the first observer, the left eye image of the second observer, the right eye image of the second observer... in turn make each observation Viewers can view 3D images. For example, the human eye detection device detects the position of the human eye of the first observer. The human eye of the first observer may be the left eye e1 of the first observer or the right eye e2 of the first observer. The human eye of the first observer The position may be the position of the first observer's left eye e1 or the position of the first observer's right eye e2. The human eye detection device also detects the position of the second observer's human eye. The second observer's human eye may be the position of the first observer's right eye e2. The left eye e3 of the second observer or the right eye e4 of the second observer, the human eye position of the second observer may be the position of the left eye e3 of the second observer or the position of the right eye e4 of the second observer. Among them, the backlight control signal corresponding to the position of the first observer's left eye e1 is the first backlight control signal, and the backlight control signal corresponding to the position of the first observer's right eye e2 is the second backlight control signal. The backlight control signal corresponding to the position of the observer's left eye e3 is the third backlight control signal, and the backlight control signal corresponding to the position of the second observer's right eye e4 is the fourth backlight control signal, then the first When the observer and the second observer each view a 3D image, the refresh method of the backlight control signal is the first backlight control signal, the second backlight control signal, the third backlight control signal, and the fourth backlight control signal. control letter No., the refresh method of the image frames is the left eye image frame of the first observer, the right eye image frame of the first observer, the left eye image frame of the second observer, and the right eye image frame of the second observer. The backlight refresh rate and image refresh rate when two observers watch a 3D image are twice as fast as when one observer watches a 3D image.

In another possible implementation manner, the left eye image of the first observer and the left eye image of the second observer, the right eye image of the first observer and the right eye image of the second observer can be displayed as follows. The left eye image of one observer and the left eye image of the second observer, the right eye image of the first observer and the right eye image of the second observer... enable each observer to see a 3D image.

For example, Figure 9 includes a first observer and a second observer. The first observer's left eye e1 receives the left eye image, the first observer's right eye e2 receives the right eye image, and the second observer's left eye e1 receives the left eye image. Eye e3 receives the left eye image, and the second observer's right eye e4 receives the right eye image. For example, the three adjacent frames are the right eye image frame of the first observer and the right eye image frame of the second observer, the left eye image frame of the first observer and the left eye image frame of the second observer, and the first observation frame. The right eye image frame of the first observer and the right eye image frame of the second observer, and the corresponding three adjacent backlight control signals are the right eye image frame of the first observer and the right eye image frame of the second observer. The backlight control signal 4, the backlight control signal 5 common to the left eye image frame of the first observer and the left eye image frame of the second observer, the right eye image frame of the first observer and the right eye image of the second observer Frame common backlight control signal 6. At this time, the backlight control signals corresponding to the two image frames are the same.

When it is necessary to display the left eye image of the first observer and the left eye image of the second observer, the human eye detection device is used to detect the human eye position of the first observer, and generate a child according to the human eye position of the first observer. Backlight control signal 51, the first observer's human eye is the first observer's left eye or right eye, and the first observer's human eye position is determined by the first observer's human eye in the field of view of the human eye detection device The angle and the distance between the human eyes of the first observer and the display panel in the display device are determined. The human eye position of the first observer may be the position of the first observer's left eye e1. Then, the sub-backlight control signal 51 is generated according to the position of the first observer's left eye e1, where the first observer's left eye There is a predetermined mapping relationship between the position of the eye e1 and the switching signal corresponding to each of the plurality of light-emitting devices. Exemplarily, the light panel in the backlight module 40 is provided with four light-emitting devices as shown in FIG. 4 , namely the light-emitting device L1 , the light-emitting device L2 , the light-emitting device L3 and the light-emitting device L4 , in which the left side of the first observer There is a mapping relationship between the position of the eye e1 and the light-emitting device L1 and the light-emitting device L2 being turned on and the light-emitting device L3 and the light-emitting device L4 being turned off. Then the switching state of the light-emitting device corresponding to the four switching signals in the sub-backlight control signal 51 is B51=(1 ,1,0,0). The elements in B51=(1,1,0,0) are the switching states of the light-emitting device L1, the light-emitting device L2, the light-emitting device L3 and the light-emitting device L4 in order from left to right.

The human eye detection device is also used to detect the human eye position of the second observer, and generate the sub-backlight control signal 52 according to the human eye position of the second observer. The human eye of the second observer is the left eye or the left eye of the second observer. The right eye, the human eye position of the second observer is determined by the angle of the second observer's human eye in the field of view of the human eye detection device, and the distance between the second observer's human eye and the display panel in the display device , where the human eye position of the second observer may be the position of the second observer's left eye e3, then the sub-backlight control signal 52 is generated according to the position of the second observer's left eye e3, where the second observer's left eye e3 There is a predetermined mapping relationship between the position of the eye e3 and the switching signal corresponding to each of the plurality of light-emitting devices. Exemplarily, the light panel in the backlight module 40 is provided with four light-emitting devices as shown in FIG. 4 , namely the light-emitting device L1 , the light-emitting device L2 , the light-emitting device L3 and the light-emitting device L4 , in which the left side of the second observer There is a mapping relationship between the position of eye e3 and the turning on of light-emitting device L2 and light-emitting device L3, and the turning off of light-emitting device L1 and light-emitting device L4. Then the switching state of the light-emitting device corresponding to the four switching signals in the sub-backlight control signal 12 is B52 = (0 ,1,1,0). The elements in B52=(0,1,1,0) are the switching states of the light-emitting device L1, the light-emitting device L2, the light-emitting device L3 and the light-emitting device L4 in order from left to right.

The human eye detection device is also configured to generate a backlight control signal 5 common to the left eye image frame of the first observer and the left eye image frame of the second observer based on the sub-backlight control signal 51 and the sub-backlight control signal 52 . Specifically, sub-backlight control signal 51 In the sub-backlight control signal 52, the light-emitting device L1 and the light-emitting device L2 are turned on, the light-emitting device L3 and the light-emitting device L4 are turned off, the light-emitting device L2 and the light-emitting device L3 are turned on, and the light-emitting device L1 and the light-emitting device L4 are turned off. Therefore, in the backlight control signal 5 , the light-emitting device L1, the light-emitting device L2 and the light-emitting device L3 are turned on, and the light-emitting device L4 is turned off. The driving circuit 42 is used to obtain the backlight control signal 5 and the backlight control signal 4. The backlight control signal 5 includes a switching signal corresponding to each of the plurality of light-emitting devices. The backlight control signal 4 includes a switch signal corresponding to each of the plurality of light-emitting devices. A switching signal corresponding to a light-emitting device; switching the switching state of the light-emitting device corresponding to a different switching signal in the backlight control signal 5 in the backlight control signal 5, so that the light-emitting device L1, the light-emitting device L2 and the light-emitting device L3 emit light to generate a light beam. The light beam is transmitted to optical module 60. The optical module 60 can change the propagation direction of the light beam generated by the light-emitting device L1 and the light-emitting device L2 in the backlight module 40 to point toward the left eye e1 of the first observer, transmit it to the display panel 22 , and then transmit it to the first observer. The optical module 60 can change the propagation direction of the light beam generated by the light-emitting device L2 and the light-emitting device L3 in the backlight module 40 to point to the left eye e3 of the second observer, and transmit it to the display panel 22, and then transmit it To the second observer's left eye e3. The display panel 22 receives the left eye image frame of the first observer. Driven by the left eye image frame of the first observer, the display panel 22 displays the left eye image of the first observer and also receives the left eye image of the second observer. Image frame, driven by the left eye image frame of the second observer, the display panel 22 displays the left eye image of the second observer, so that the left eye e1 of the first observer views the left eye image of the first observer , the second observer's left eye e3 views the second observer's left eye image.

Then, the human eye position of the first observer may also be the position of the first observer's right eye e2. According to the position of the first observer's right eye e2, the sub-backlight control signal 61 is generated, and 4 of the sub-backlight control signal 61 is generated. The switching state of the light-emitting device corresponding to each switching signal is B61=(0,1,1,0). The elements in B61=(0,1,1,0) are the switching states of the light-emitting device L1, the light-emitting device L2, the light-emitting device L3 and the light-emitting device L4 in order from left to right. The human eye position of the second observer can also be the position of the second observer's right eye e4. According to the position of the second observer's right eye e4, the sub-backlight control signal 62 is generated. The four switches in the sub-backlight control signal 62 The switching state of the light-emitting device corresponding to the signal is B62=(0,0,1,1). The elements in B62=(0,0,1,1) are the switching states of the light-emitting device L1, the light-emitting device L2, the light-emitting device L3 and the light-emitting device L4 in order from left to right. The human eye detection device is also used to generate the backlight control signal 6 according to the sub-backlight control signal 61 and the sub-backlight control signal 62 . Specifically, in the sub-backlight control signal 61, the light-emitting device L2 and the light-emitting device L3 are turned on, and the light-emitting device L1 and the light-emitting device L4 are turned off. In the sub-backlight control signal 62, the light-emitting device L3 and the light-emitting device L4 are turned on, and the light-emitting device L1 and the light-emitting device L2 are turned off. , therefore, in the backlight control signal 6, the light-emitting device L2, the light-emitting device L3 and the light-emitting device L4 are turned on, and the light-emitting device L1 is turned off. The driving circuit 42 is used to obtain the backlight control signal 6 and the backlight control signal 5. The backlight control signal 6 includes a switching signal corresponding to each of the plurality of light-emitting devices, and the backlight control signal 5 includes a switch signal corresponding to each of the plurality of light-emitting devices. A switching signal corresponding to a light-emitting device; switching the switching state of the light-emitting device corresponding to a different switching signal in the backlight control signal 5 in the backlight control signal 6, because in the backlight control signal 5, the light-emitting device L1, the light-emitting device L2 and the light-emitting device L3 When the light-emitting device L4 is turned on, the light-emitting device L4 is turned off. Therefore, the switching state of the light-emitting device L1 and the light-emitting device L4 is switched, so that the light-emitting device L2, the light-emitting device L3 and the light-emitting device L4 emit light to generate a light beam, which is transmitted to the optical module 60 . The optical module 60 can change the propagation direction of the light beam generated by the light-emitting device L2 and the light-emitting device L3 in the backlight module 40 to point toward the right eye e2 of the first observer, and transmit it to the display panel 22 and then to the first observer. The optical module 60 can change the propagation direction of the light beam generated by the light-emitting device L3 and the light-emitting device L4 in the backlight module 40 to point to the right eye e4 of the second observer, transmit it to the display panel 22, and then transmit it to the display panel 22. To the second observer's right eye e4. The display panel 22 receives the right eye image frame of the first observer. Driven by the right eye image frame of the first observer, the display panel 22 displays the right eye image of the first observer and also receives the right eye image of the second observer. Image frame, the display panel 22 displays the right eye image of the second observer driven by the right eye image frame of the second observer, so that the right eye e2 of the first observer views the right eye image of the first observer, The second observer's right eye e4 sees the second observer image of the right eye. Then, in one refresh process, two different left-eye images or two different right-eye images of different observers can be displayed.

In some embodiments, as shown in FIG. 10 , the display device 100 includes a display panel 22 and a control circuit 70 , the control circuit 70 is connected to the display panel 22 , and the control circuit 70 is connected to the driving circuit 42 ; the control circuit 70 is used to control the first The image frame is compared with the second image frame to determine at least one pixel group in the display panel, wherein in each pixel group of the at least one pixel group, the assigned pixel point corresponding to the first image frame and the second image The difference between the assigned pixel points corresponding to the frame is greater than a predetermined value; it is also used to obtain the first backlight control signal corresponding to each pixel group in at least one pixel group.

Exemplarily, the display device 100 further includes a memory. The control circuit 70 is connected to the memory. The control circuit 70 is also connected to a human eye detection device. The human eye detection device transmits the detected human eye position of the first observer to the control circuit 70 . The control circuit 70 searches the memory for a switching signal corresponding to each of the plurality of light-emitting devices that has a mapping relationship with the current eye position of the first observer in the memory, and generates a backlight control The signal is transmitted to the driving circuit 42 in the backlight module 40, or the control circuit 70 calculates according to the human eye position of the first observer, among the multiple light-emitting devices that have a mapping relationship with the current human eye position of the first observer. The switching signal corresponding to each light-emitting device is used to generate a backlight control signal and transmit it to the driving circuit 42 in the backlight module 40 . In other embodiments, the control circuit 70 may also obtain the first backlight control signal of the first image frame and the second backlight control signal of the second image frame, where the first backlight control signal includes a plurality of light-emitting devices. a switching signal corresponding to each light-emitting device, the second image frame is the previous image frame of the first image frame, and the second backlight control signal includes a switching signal corresponding to each light-emitting device in the plurality of light-emitting devices; the control circuit 70 determines The different switching signals in the first backlight control signal and the second backlight control signal are transmitted to the driving circuit 42 , and the driving circuit 42 is used to switch the first backlight control signal. The switching state of the light-emitting device corresponding to the different switching signals in the second backlight control signal in the backlight control signal.

For example, as shown in FIG. 11 , in the display panel 22 shown in FIG. 11 , the display panel 22 includes 128*128 array distributed pixel points, wherein the array distributed pixel points are divided into 4*4 Each pixel group includes 32*32 pixels. According to the arrangement shown in Figure 11, the order from top to bottom is the first row of pixel groups, the second row of pixel groups, and the third row of pixels. group and the fourth row of pixel groups. From left to right in each row of pixel groups are the first column of pixel groups, the second column of pixel groups, the third column of pixel groups and the fourth column of pixel groups. The first image frame and the second image frame are two adjacent image frames, and the second image frame is the previous image frame of the first image frame. When displaying the image corresponding to the first image frame, the control circuit 70 obtains the first image frame. For example, the number of pixel points assigned in the 4-column pixel group of the first row corresponding to the first image frame are 543, 766, 852, 19, the number of pixels assigned in the 4-column pixel group in the second row are 765, 109, 654, 98 respectively, and the number of pixels assigned in the 4-column pixel group in the third row are respectively 900, 124, 876, 582. The numbers of pixels assigned in the 4-column pixel group of the fourth row are 988, 187, 234, and 199 respectively. When displaying the image corresponding to the second image frame, the control circuit 70 obtains the second image frame. For example, the numbers of pixel points assigned to the 4-column pixel group of the first row of the second image frame are 599, 966, 768, 30. The number of pixels assigned in the 4-column pixel group in the second row are 865, 200, 740, and 376 respectively. The number of pixels assigned in the 4-column pixel group in the third row are 876, 212, 890, 600, the number of pixels assigned in the 4-column pixel group of the fourth row are 1000, 224, 890, and 100 respectively.

Among them, the control circuit 70 compares the difference between the number of assigned pixel points corresponding to the first image frame and the number of assigned pixel points corresponding to the second image frame in the 4-column pixel group of the first row, which are 56 and 200 respectively. , 84, 11; The control circuit 70 compares the difference between the number of assigned pixel points corresponding to the first image frame and the number of assigned pixel points corresponding to the second image frame in the 4-column pixel group of the second row. 100, 91, 86, 278; the control circuit 70 compares the 4-column pixel group of the third row , the differences between the number of assigned pixels corresponding to the first image frame and the number of assigned pixels corresponding to the second image frame are 24, 88, 14, and 18 respectively; the control circuit 70 compares the 4 in the fourth row In the column pixel group, the differences between the number of assigned pixel points corresponding to the first image frame and the number of assigned pixel points corresponding to the second image frame are 12, 37, 656, and 99 respectively.

Exemplarily, the control circuit 70 determines that in a pixel group, the difference between the number of assigned pixel points corresponding to the first image frame and the number of assigned pixel points corresponding to the second image frame is greater than a predetermined value. The value can be 10% of the total number of pixels in the pixel group, that is, 32*32*10%≈102, indicating the number of pixels assigned to the current pixel group when displaying the first image frame and the second image frame. If the difference is relatively large, then the pixel group may be a pixel group with outstanding 3D effect, or it may be a pixel group corresponding to the out-of-screen and in-screen effects in the 3D image. In other pixel groups, the difference between the number of assigned pixels corresponding to the first image frame and the number of assigned pixels corresponding to the second image frame is less than a predetermined value, indicating that the current pixel group is displaying the first image frame. Compared with when displaying the second image frame, the number of assigned pixels is not much different, and the 3D effect is not prominent.

The predetermined value may be 10% of the total number of pixels in the pixel group, or it may be 20% of the total number of pixels in the pixel group. For example, when the refresh rate of the display panel becomes faster, the percentage will decrease. , the predetermined value also decreases. The embodiments of this application do not limit the predetermined value.

Then, the control circuit 70 determines that when the current display panel displays the first image and the second image, at least one pixel group with outstanding 3D effect includes: the pixel group Z1 in the first row and second column, and the pixel group Z1 in the second row and fourth column. Group Z2, pixel group Z3 in the fourth row and third column.

Referring to FIG. 12 , when the control circuit 70 divides the pixels in the display panel 22 into multiple pixel groups, the control circuit 70 also divides the multiple light-emitting devices in the backlight module 40 into multiple light-emitting device groups, and One pixel group in the display panel 22 corresponds to a group of light-emitting device groups in the backlight module 40 . For example, the pixel group Z1 in the first row and second column of the display panel 22 corresponds to the light-emitting device group H1 in the backlight module 40 , and the pixel group Z2 in the second row and fourth column of the display panel 22 corresponds to the backlight module 40 The light-emitting device group H2, the pixel group Z3 in the fourth row and third column of the display panel 22 corresponds to the light-emitting device group H3 in the backlight module 40. Among them, the light-emitting device group corresponding to the pixel group containing 32*32 pixels can have 32*32 light-emitting devices, that is, each light-emitting device corresponds to one pixel, or the light-emitting device group can have 16*16 light-emitting devices. device, each light-emitting device corresponds to four pixels. The embodiments of the present application do not limit the number of pixels corresponding to one light-emitting device.

Therefore, the control circuit 70 is also used to obtain the first backlight control signal of the light-emitting device group H1 corresponding to the pixel group Z1, and transmit the first backlight control signal of the light-emitting device group H1 to the driving circuit 42; and obtain the luminescence signal corresponding to the pixel group Z2. The first backlight control signal of the device group H2 is transmitted to the driving circuit 42; the first backlight control signal of the light-emitting device group H3 corresponding to the pixel group Z3 is obtained, and the first backlight control signal of the light-emitting device group H3 is obtained. The first backlight control signal is transmitted to the driving circuit 42 .

The driving circuit 42 is specifically used to obtain the first backlight control signal of the light-emitting device group H1 corresponding to the pixel group Z1 and the second backlight control signal of the light-emitting device group H1, and the first backlight control signal of the light-emitting device group H2 corresponding to the pixel group Z2. and the second backlight control signal of the light-emitting device group H2, the first backlight control signal of the light-emitting device group H3 corresponding to the pixel group Z3, and the second backlight control signal of the light-emitting device group H3, wherein the first backlight control signal is the first The backlight control signal of the image frame is the backlight control signal of the second image frame.

Optionally, the driving circuit 42 compares the first backlight control signal of the light-emitting device group H1 with the second backlight control signal of the light-emitting device group H1, and determines whether the first backlight control signal of the light-emitting device group H1 is consistent with the light-emitting device group H1. Different switching signals in the second backlight control signal; combine the first backlight control signal of the light-emitting device group H2 and the first backlight control signal of the light-emitting device group H2 The second backlight control signal is compared to determine the switch signal in the first backlight control signal of the light-emitting device group H2 and the second backlight control signal of the light-emitting device group H2; the first backlight control signal of the light-emitting device group H3 and the lighting The second backlight control signal of the device group H3 is compared to determine the switch signal in the first backlight control signal of the light-emitting device group H3 and the second backlight control signal of the light-emitting device group H3.

The driving circuit 42 switches the switching states of the light-emitting devices corresponding to different switching signals in the first backlight control signal of the light-emitting device group H1 and the second backlight control signal of the light-emitting device group H1, and switches the first backlight control of the light-emitting device group H2 The switching state of the light-emitting device in the signal corresponds to a different switching signal in the second backlight control signal of the light-emitting device group H2, switching the first backlight control signal of the light-emitting device group H3 and the second backlight control signal of the light-emitting device group H3 Different switching signals correspond to the switching states of the light-emitting device. In order to realize that every time the backlight control signal is switched, the driving circuit only needs to compare the backlight control signals of the light-emitting devices in the area corresponding to the pixel group with a more prominent 3D image effect. The number of controlled light-emitting devices will be reduced again, and the control efficiency will be reduced again. will be promoted again.

Referring to FIG. 13 , embodiments of the present application also provide a backlight control method, which is applied to a display device. The backlight module may be the backlight module 40 shown in FIG. 4 , and the backlight module includes A light panel is provided with a plurality of light-emitting devices distributed in an array.

Backlight control methods include:

S101. Obtain the first backlight control signal of the first image frame and the second backlight control signal of the second image frame.

Wherein, the first backlight control signal includes a switching signal corresponding to each light-emitting device in the plurality of light-emitting devices, and one switching signal correspondingly controls the switching state of one light-emitting device. Specifically, referring to FIG. 4 , the multiple light-emitting devices in FIG. 4 are described by taking four light-emitting devices as an example. Then, the first backlight signal includes a switching signal corresponding to each of the four light-emitting devices. , and when displaying the image corresponding to the first image frame, the light-emitting device L2 and the light-emitting device L4 need to be turned on, and the light-emitting device L1 and the light-emitting device L3 need to be turned off. Then, the switching states of the light-emitting devices corresponding to the four switching signals included in the first backlight control signal may exist in a matrix form, for example, B=(0,1,0,1), where the matrix B=(0,1 The elements in ,0,1) represent the switching states of the light-emitting device L1, the light-emitting device L2, the light-emitting device L3 and the light-emitting device L4 in order from left to right.

When displaying the previous image frame of the first image frame, that is, the image corresponding to the second image frame, the light-emitting device L1 and the light-emitting device L2 are turned on, and the light-emitting device L3 and the light-emitting device L4 are turned off, where the second backlight control signal is Backlight control signal for the second image frame. The second backlight control signal includes switching states “1”, “1”, “0”, and “0” respectively corresponding to the switching signals of the light-emitting device L1, the light-emitting device L2, the light-emitting device L3, and the light-emitting device L4. Among them, the switching states of the light-emitting devices corresponding to the four switching signals in the second backlight control signal can also be represented by a matrix, for example, A=(1,1,0,0), where the matrix A=(1,1,0, The elements in 0) represent the switching states of the light-emitting device L1, the light-emitting device L2, the light-emitting device L3, and the light-emitting device L4 in order from left to right.

For example, in a display device where the backlight module is applied, the backlight control signal of the previous image frame of the image frame to be displayed will be retained in the cache of the memory of the display device. Therefore, the second backlight control signal can be read from the cache. .

S102. Switch the switching state of the light-emitting device corresponding to different switching signals in the first backlight control signal and the second backlight control signal.

After obtaining the first backlight control signal, the switching state of the light-emitting device corresponding to the different switching signals in the first backlight control signal and the second backlight control signal can be switched. For example, according to step S103, it can be known that the first backlight control signal The switch signals in the signal that are different from the second backlight control signal are the switch signals corresponding to the light-emitting device L1 and the switch signals corresponding to the light-emitting device L4. Then, switching the switch state of the light-emitting device L1 is specifically changing the switch state of the light-emitting device L1 by On to off, switching the switch state of the light-emitting device L4, specifically changing the switch state of the light-emitting device L4 from off turns on.

In other embodiments, after step S101 and before step S102, the method further includes: determining a switch signal in the first backlight control signal that is different from the second backlight control signal.

The switching states of the light-emitting devices corresponding to the four switching signals in the first backlight control signal corresponding to the first image frame are matrix B=(0,1,0,1), where the elements in matrix B are arranged from left to right. The switching states of the light-emitting device L1, the light-emitting device L2, the light-emitting device L3 and the light-emitting device L4 are shown in sequence; the switching states of the light-emitting devices corresponding to the four switching signals in the second backlight control signal corresponding to the second image frame are matrix A = (1,1,0,0), where the elements in matrix A represent the switching states of the light-emitting device L1, the light-emitting device L2, the light-emitting device L3 and the light-emitting device L4 in order from left to right. By comparing matrix A and matrix B, different switching signals in the first backlight control signal and the second backlight control signal can be determined. The different switching signals are the switching signals corresponding to the light-emitting device L1 and the switching signals corresponding to the light-emitting device L4.

More specifically, the matrix B=(0,1,0,1) of the switching states of the light-emitting devices corresponding to the four switching signals in the first backlight control signal can be combined with the four switching signals in the second backlight control signal. The switching state corresponding to the switching signal of the same light-emitting device in the matrix A=(1,1,0,0) of the corresponding light-emitting device is subjected to an XOR operation, and the first backlight control is determined according to the result of the XOR operation. Whether the switching signal of the same light-emitting device in the signal and the second backlight control signal is the same. Among them, the result of the XOR operation is "0", which means the same, and the result of the XOR operation is "1", which means they are different. That is to say, the first element "0" in matrix B performs an XOR operation with the first element "1" in matrix A. The result of the XOR operation is "1", which means that the first backlight control signal and the second The switching signal corresponding to the light-emitting device L1 in the backlight control signal is different; the second element "1" in matrix B performs an XOR operation with the second element "1" in matrix A, and the result of the XOR operation is "0" It means that the switching signal corresponding to the light-emitting device L2 in the first backlight control signal and the second backlight control signal is the same; the third element "0" in matrix B performs an XOR operation with the third element "0" in matrix A, The result of the XOR operation is "0", which means that the switching signal corresponding to the light-emitting device L3 in the first backlight control signal and the second backlight control signal are the same; the fourth element "1" in matrix B is the same as the fourth element "1" in matrix A. The element "0" performs an XOR operation, and the result of the XOR operation is "1" indicating that the switching signals corresponding to the light-emitting device L4 in the first backlight control signal and the second backlight control signal are different.

It is thus determined that the switch signals in the first backlight control signal that are different from the switch signals in the second backlight control signal are the switch signals corresponding to the light-emitting device L1 and the switch signals corresponding to the light-emitting device L4. Then, in S102, the switch of the light-emitting device L1 is switched. state, specifically changing the switching state of the light-emitting device L1 from on to off, switching the switching state of the light-emitting device L4, specifically changing the switching state of the light-emitting device L4 from off to on.

In other embodiments, specifically, under the control of a clock signal, the switching states of the light-emitting devices corresponding to different switching signals in the first backlight control signal and the second backlight control signal can be switched simultaneously, or switching in a predetermined sequence. The switching states of the light-emitting devices corresponding to different switching signals in the first backlight control signal and the second backlight control signal, the predetermined sequence includes: row-by-row switching and column-by-column switching. Wherein, under the control of the clock signal, the switching states of the light-emitting devices corresponding to different switching signals in the first backlight control signal and the second backlight control signal are simultaneously switched, so that the switching states corresponding to the light-emitting device L1 and the light-emitting device L2 are switched, The light-emitting device L2 and the light-emitting device L4 are turned on, and the light-emitting device L1 and the light-emitting device L3 are turned off. Alternatively, when the switching method of the display panel in the display device is row-by-row switching, for example, when switching row by row in order from top to bottom, under the control of the clock signal, the first backlight control signal and the switching mode are also switched row by row. Different switching signals in the second backlight control signal correspond to the switching status of the light-emitting device, that is, first switching the switching status of the light-emitting device L1 so that the light-emitting device L2 in the first row from top to bottom is turned on and the light-emitting device L1 is turned off. Then switch the switching state of the light-emitting device L4 so that the light-emitting device L4 in the second row from top to bottom is turned on and the light-emitting device L3 is turned off. Or when the display panel in the display device switches column by column, for example, when switching column by column in order from left to right, under the control of the clock signal, the first backlight control signal and the switching method are also switched column by column. Different switching signal pairs in the second backlight control signal The corresponding switch state of the light-emitting device, that is, first switch the switch state of the light-emitting device L1 so that the light-emitting device L1 and the light-emitting device L3 in the first column from left to right are both turned off, and then switch the switch state of the light-emitting device L4 so that Both the light-emitting device L2 and the light-emitting device L4 in the second row from left to right are turned on. That is to say, the driving circuit drives and switches the switching state of the light-emitting device corresponding to different switching signals in the first backlight control signal and the second backlight control signal, and can change according to the switching mode of the display panel, achieving the effect of the light following the screen.

In other embodiments, the above-mentioned backlight control method may specifically be a backlight control method used for backlight modules in backlight technology. Among them, the image frame switching method in the directional backlight technology is left eye image frame, right eye image frame, left eye image frame, right eye image frame... cycle. Referring to Figure 14, the backlight control method used by the backlight module in the directional backlight technology includes:

S201. Detect the eye position of the first observer, and generate a first backlight control signal according to the eye position of the first observer.

Wherein, the human eye of the first observer may be the left eye of the first observer or the right eye of the first observer, and the human eye position of the first observer may be the position of the left eye of the first observer or the first observation The position of the first observer's human eye is determined by the angle of the first observer's human eye in the field of view and the distance between the first observer's human eye and the display panel in the display device. For example, as shown in Figure 4, there is a mapping relationship between the position of the first observer's left eye and the turning on of the light-emitting device L1 and the light-emitting device L2, and the turning off of the light-emitting device L3 and the light-emitting device L4, then 4 in the first backlight control signal The switching state of the light-emitting device corresponding to each switching signal is B=(1,1,0,0). The elements in B=(1,1,0,0) are the switching states of the light-emitting device L1, the light-emitting device L2, the light-emitting device L3 and the light-emitting device L4 in order from left to right.

S202. Obtain the first backlight control signal of the first image frame and the second backlight control signal of the second image frame.

Among them, the first backlight control signal generated in step S201 is the first backlight control signal of the first image frame. The first image frame can specifically be the left eye image frame of the first observer. Subsequently, the first image needs to be acquired. A first backlight control signal for a frame and a second backlight control signal for a second image frame. Specifically, the second image frame is the previous image frame of the first image frame. When the first image frame is the left eye image frame of the first observer, since the image frame switching method in the directional backlight technology is a left eye image frame, a right eye image frame, a left eye image frame, a right eye image frame... in a loop, The second image frame is therefore the right eye image frame of the first observer.

Optionally, the backlight control method further includes: determining a switch signal that is different in the first backlight control signal and a second backlight control signal. The switch signal that is different in the first backlight control signal and the second backlight control signal corresponds to When switching between two adjacent image frames, it is necessary to switch the light-emitting device in the light-on state.

S203. Switch the switching state of the light-emitting device corresponding to different switching signals in the first backlight control signal and the second backlight control signal.

According to the different switch signals in the first backlight control signal and the second backlight control signal, the switch state of the light-emitting device corresponding to the different switch signals in the first backlight control signal and the second backlight control signal can be switched, for example, it is necessary to The switch state of the light-emitting device that switches the switch state changes from on to off, or the switch state of the light-emitting device that needs to switch the switch state changes from off to on. Among them, the switch signals in the first backlight control signal that are different from the switch signals in the second backlight control signal are the light-emitting devices that need to switch the switch state based on the switch states of all the light-emitting devices corresponding to the second image frame, and these needs After the switching state of the light-emitting device that switches the switching state is switched, it is the switching state of all the light-emitting devices corresponding to the first image frame.

For example, the switching state is often under the control of a clock signal, switching the switching states of the light-emitting devices corresponding to different switching signals in the first backlight control signal and the second backlight control signal at the same time, or switching the first backlight control signal in a predetermined order. The switching states of the light-emitting devices corresponding to different switching signals in the backlight control signal and the second backlight control signal, the predetermined sequence includes: row-by-row switching and column-by-column switching.

The light-emitting device then emits light to generate a light beam, which is transmitted to the optical module in the display device. The optical module changes the direction of the light beam and transmits it to the display panel in the display device. Specifically, the light-emitting device whose switch state corresponds to the first backlight control signal is turned on generates the first light beam, and the first light beam is transmitted to the left eye of the first observer through the optical module in the display device, wherein the display panel receives the first light beam. An image frame (that is, the left eye image frame of the first observer). Driven by the first image frame, the display panel in the display device displays the left eye image of the first observer, so that the left eye image of the first observer View the left eye image.

S204. Detect the eye position of the first observer, and generate a third backlight control signal according to the eye position of the first observer.

Specifically, after the first observer's left eye image is displayed, the first observer's right eye image needs to be displayed, where the first observer's human eye can be the first observer's left eye or the first observer's The right eye of the first observer, the human eye position of the first observer can be the position of the first observer's left eye or the position of the first observer's right eye, and the human eye position of the first observer is determined by the first observer's human eye position. The angle in the field of view and the distance between the human eye of the first observer and the display panel in the display device are determined. In step S204, the position of the human eye of the first observer is specifically the right eye of the first observer. Position, as shown in Figure 4, there is a mapping relationship between the position of the first observer's right eye and the turning on of the light-emitting device L3 and the light-emitting device L4, and the turning off of the light-emitting device L1 and the light-emitting device L2, then the four switches in the third backlight control signal The switching state of the light-emitting device corresponding to the signal is B=(0,0,1,1). The elements in B=(0,0,1,1) are the switching states of the light-emitting device L1, the light-emitting device L2, the light-emitting device L3 and the light-emitting device L4 in order from left to right.

In some embodiments, the position of the first observer's left eye and the position of the first observer's right eye may be detected in step S201. Then in step S204, it only needs to be based on the position of the first observer's right eye. The third backlight control signal is generated at the position of the right eye. The embodiments of the present application do not limit this.

S205. Obtain the third backlight control signal of the third image frame and the first backlight control signal of the first image frame.

After the left eye image of the first observer is displayed in step S203, it is then necessary to display the right eye image of the first observer. Among them, the third backlight control signal generated in step S204 is the third backlight control signal of the third image frame. The third image frame is specifically the right eye image frame of the first observer, and the left eye image of the first observer The frame (first image frame) is the previous image frame of the first observer's right eye image frame (third image frame). Therefore, it is also necessary to obtain the third backlight control signal of the third image frame and the first image frame. The first backlight control signal.

Optionally, the backlight control method further includes: determining a switch signal in the third backlight control signal that is different from the first backlight control signal, and the switch signal in the third backlight control signal that is different from the first backlight control signal corresponds to When switching between two adjacent image frames, it is necessary to switch the light-emitting device in the light-on state.

S206. Switch the switching state of the light-emitting device corresponding to a different switching signal in the first backlight control signal in the third backlight control signal.

According to the switch signal in the third backlight control signal that is different from the switch signal in the first backlight control signal, the switch state of at least one light-emitting device corresponding to the switch signal in the third backlight control signal that is different from the switch signal in the first backlight control signal can be switched, for example Change the switch state of the light-emitting device that needs to be switched from on to off, or change the switch state of the light-emitting device that needs to be switched from off to on. Among them, the switch signals in the third backlight control signal that are different from the first backlight control signal are the light-emitting devices that need to switch the switch state based on the switch states of all the light-emitting devices corresponding to the first image frame, and these needs After the switching state of the light-emitting device that switches the switching state is switched, it is the switching state of all the light-emitting devices corresponding to the third image frame.

For example, the switching state is often under the control of a clock signal, switching the switching states of the light-emitting devices corresponding to different switching signals in the first backlight control signal in the third backlight control signal at the same time, or switching the third backlight control signal in a predetermined order. The switching state of the light-emitting device corresponding to the different switching signals in the first backlight control signal in the backlight control signal is predetermined in sequence. The sequence includes: row-by-row switching and column-by-column switching.

The light-emitting device then emits light to generate a light beam, which is transmitted to the optical module in the display device. The optical module changes the direction of the light beam and transmits it to the display panel in the display device. Specifically, the switch state corresponding to the third backlight control signal generates a third light beam for the turned-on light-emitting device, and the third light beam is transmitted to the right eye of the first observer through the optical module in the display device, wherein the display panel receives the third light beam. Image frame (that is, the right eye image frame of the first observer), driven by the third image frame, the display panel in the display device displays the right eye image of the first observer, so that the right eye of the first observer watches to the right eye image.

When the first observer views the left eye image and the right eye image, the first observer can view the 3D stereoscopic image.

In other embodiments, when it is necessary to display a 3D image to two different observers, the left eye image of the first observer, the right eye image of the first observer, and the second observer's image can be displayed as follows. Left eye image, second observer's right eye image, first observer's left eye image, first observer's right eye image, second observer's left eye image, second observer's The right eye image... in turn enables each observer to view a 3D image. Such a backlight control method is consistent with the backlight control method shown in FIG. 14 . However, the above steps need to be repeated twice. When steps S201 to S206 are executed for the first time, they are the left eye image of the first observer and the right eye image of the first observer. When steps S201 to S206 are executed for the second time, When , it is the left eye image of the second observer and the right eye image of the second observer. Repeat this.

Alternatively, one can display the left eye image of the first observer with the left eye image of the second observer, the right eye image of the first observer with the right eye image of the second observer, and the first observer The left eye image of the second observer and the left eye image of the second observer, the right eye image of the first observer and the right eye image of the second observer... make each observer see a 3D image.

Then S201 shown in Figure 14 includes:

S201a. Detect the eye position of the first observer, and generate a first sub-backlight control signal according to the eye position of the first observer.

Wherein, the human eye of the first observer may be the left eye of the first observer or the right eye of the first observer, and the human eye position of the first observer may be the position of the left eye of the first observer or the first observation The position of the first observer's right eye is determined by the angle between the first observer's human eye in the field of view of the human eye detection device, and the angle between the first observer's human eye and the display in the display device. The distance between panels is determined. Specifically, the first sub-backlight control signal is generated according to the left eye position of the first observer, where there is a predetermined mapping between the left eye position of the first observer and the switching signal corresponding to each light-emitting device in the plurality of light-emitting devices. relation. For example, the light panel in the backlight module 40 is provided with four light-emitting devices as shown in FIG. 4 , namely the light-emitting device L1, the light-emitting device L2, the light-emitting device L3 and the light-emitting device L4. The first one is observed There is a mapping relationship between the position of the user's left eye e1 and the turning on of the light-emitting device L1 and the light-emitting device L2, and the turning off of the light-emitting device L3 and the light-emitting device L4. Then the switching state of the light-emitting device corresponding to the four switching signals in the first sub-backlight control signal is B11=(1,1,0,0). The elements in B11=(1,1,0,0) are the switching states of the light-emitting device L1, the light-emitting device L2, the light-emitting device L3 and the light-emitting device L4 in order from left to right.

S201b. Detect the eye position of the second observer, and generate a second sub-backlight control signal according to the eye position of the second observer.

The human eye of the second observer may be the left eye of the second observer or the right eye of the second observer, and the human eye position of the second observer may be the left eye position of the second observer or the right eye of the second observer. The position of the right eye of the second observer is determined by the angle of the second observer's human eye in the field of view of the human eye detection device, and the angle between the second observer's human eye and the display panel in the display device. The distance is determined. Specifically, the second sub-backlight control signal is generated according to the position of the second observer's left eye, where there is a predetermined relationship between the position of the second observer's left eye and the switch signal corresponding to each of the plurality of light-emitting devices. Mapping relations. For example, the light board in the backlight module 40 is provided with four light-emitting lamps as shown in Figure 4 The devices are respectively the light-emitting device L1, the light-emitting device L2, the light-emitting device L3 and the light-emitting device L4. There is a mapping between the position of the second observer's left eye and the turning on of the light-emitting device L2 and the light-emitting device L3, and the turning off of the light-emitting device L1 and the light-emitting device L4. relationship, then the switching state of the light-emitting device corresponding to the four switching signals in the second sub-backlight control signal is B12=(0,1,1,0). The elements in B12=(0,1,1,0) are the switching signals of the light-emitting device L1, the light-emitting device L2, the light-emitting device L3 and the light-emitting device L4 in order from left to right.

S201c. Generate a first backlight control signal according to the first sub-backlight control signal and the second sub-backlight control signal.

Specifically, in the first sub-backlight control signal, the light-emitting device L1 and the light-emitting device L2 are turned on, and the light-emitting device L3 and the light-emitting device L4 are turned off. In the second sub-backlight control signal, the light-emitting device L2 and the light-emitting device L3 are turned on, and the light-emitting device L1 and the light-emitting device are turned off. L4 is turned off. Therefore, in the first backlight control signal, the light-emitting device L1, the light-emitting device L2 and the light-emitting device L3 are turned on, and the light-emitting device L4 is turned off. That is to say, the switching states of the light-emitting devices corresponding to the four switching signals in the first backlight control signal are represented by the matrix B=(1,1,1,0), and B=(1,1,1,0) according to The order from left to right is the switching states of the light-emitting device L1, the light-emitting device L2, the light-emitting device L3 and the light-emitting device L4.

And step S204 shown in Figure 14 includes:

S204a. Detect the eye position of the first observer, and determine the third sub-backlight control signal according to the eye position of the first observer.

The human eye of the first observer may be the left eye of the first observer or the right eye of the first observer, and the position of the human eye of the first observer may be the position of the left eye of the first observer or the position of the first observer's right eye. The position of the right eye, since the first sub-backlight control signal is generated based on the position of the first observer's left eye in step S201a, then in step S2204, the third sub-backlight is generated based on the position of the first observer's right eye. Control signal, the switching state of the light-emitting device corresponding to the four switching signals in the third sub-backlight control signal is B21=(0,1,1,0). The elements in B21=(0,1,1,0) are the switching states of the light-emitting device L1, the light-emitting device L2, the light-emitting device L3 and the light-emitting device L4 in order from left to right.

S204b. Detect the eye position of the second observer, and determine the fourth sub-backlight control signal according to the eye position of the second observer.

The human eye of the second observer may be the left eye of the second observer or the right eye of the second observer, and the position of the human eye of the second observer may be the position of the left eye of the second observer or the position of the second observer's right eye. The position of the right eye, since the second sub-backlight control signal is generated based on the position of the second observer's left eye in step S201b, then in step S204b, the fourth sub-backlight is generated based on the position of the second observer's right eye. Control signal, the switching state of the light-emitting device corresponding to the four switching signals in the fourth sub-backlight control signal is B22=(0,0,1,1). The elements in B22=(0,0,1,1) are the switching states of the light-emitting device L1, the light-emitting device L2, the light-emitting device L3 and the light-emitting device L4 in order from left to right.

S204c. Generate a third backlight control signal according to the third sub-backlight control signal and the fourth sub-backlight control signal.

Specifically, in the third sub-backlight control signal, the light-emitting device L2 and the light-emitting device L3 are turned on, and the light-emitting device L1 and the light-emitting device L4 are turned off. In the fourth sub-backlight control signal, the light-emitting device L3 and the light-emitting device L4 are turned on, and the light-emitting device L1 and the light-emitting device are turned off. L2 is turned off. Therefore, in the third backlight control signal, the light-emitting device L2, the light-emitting device L3 and the light-emitting device L4 are turned on, and the light-emitting device L1 is turned off. That is to say, the switching states of the light-emitting devices corresponding to the four switching signals in the third backlight control signal are represented by the matrix C=(0,1,1,1), and C=(0,1,1,1) according to The order from left to right is the switching states of the light-emitting device L1, the light-emitting device L2, the light-emitting device L3 and the light-emitting device L4.

The other steps are the same as shown in Figure 14.

In other embodiments, the first image frame may be compared with the second image frame to determine at least one pixel group in the display panel, wherein each pixel group in the at least one pixel group is different from the first image frame. The difference between the corresponding assigned pixel point and the assigned pixel point corresponding to the second image frame is greater than a predetermined value; obtaining the first backlight control signal, specifically including Obtain the first backlight control signal of the first image frame corresponding to each pixel group in at least one pixel group, and the second backlight control signal of the second image frame corresponding to each pixel group in at least one pixel group.

Among them, when the pixels of the display panel are divided into multiple pixel groups, the multiple light-emitting devices in the backlight module are also divided into multiple light-emitting device groups, and one pixel group in the display panel corresponds to one group in the backlight module. Light emitting device group. Then, in a pixel group, the difference between the number of assigned pixel points corresponding to the first image frame and the number of assigned pixel points corresponding to the second image frame is greater than a predetermined value, and the predetermined value may be within the pixel group. 10% of the total number of pixels, that is, 32*32*10%≈102, indicating that when the current pixel group displays the first image frame and the second image frame, the difference in the number of assigned pixels is relatively large, then the pixel The group may be a pixel group with outstanding 3D effect, or it may be a pixel group corresponding to the out-of-screen and in-screen effects in the 3D image. In other pixel groups, the difference between the number of assigned pixels corresponding to the first image frame and the number of assigned pixels corresponding to the second image frame is less than a predetermined value, indicating that the current pixel group is displaying the first image frame. Compared with when displaying the second image frame, the number of assigned pixels is not much different, and the 3D effect is not prominent.

The predetermined value may be 10% of the total number of pixels in the pixel group, or it may be 20% of the total number of pixels in the pixel group. For example, when the refresh rate of the display panel becomes faster, the percentage will decrease. , the embodiment of the present application does not limit the predetermined value.

Then, after determining the pixel group with outstanding 3D effect when the current display panel displays the first image and the second image, the first backlight control signal is obtained, which specifically includes obtaining the light-emitting device group corresponding to each pixel group with outstanding 3D effect. The first backlight control signal is used to realize that every time the backlight control signal is switched, the driving circuit only needs to compare the backlight control signals of the light-emitting devices in the area corresponding to the pixel group with a more prominent effect of the 3D image, and the number of light-emitting devices controlled will be Reduced again, the efficiency of control will increase again.

Among them, embodiments of the present application provide a computer-readable storage medium. The computer-readable storage medium includes computer instructions. When the computer instructions are run on a computer, they cause the computer to execute the backlight control method shown in FIG. 13 or FIG. 14 . For example, if each step in Figure 13 or Figure 14 is implemented in the form of a software function module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the embodiments of the present application is essentially or contributes to the existing technology, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a The storage medium includes several instructions to cause a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor to execute all or part of the steps of the backlight control method described in various embodiments of the present application. . Storage media for storing computer software products include: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk, etc., which can store program code medium.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using a software program, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer-executable instructions. When the computer execution instructions are loaded and executed on the computer, the computer is caused to execute the backlight control method described in the embodiments of the present application. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable device. Computer-executable instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, computer-executable instructions may be transmitted from a website, computer, server, or data center via a wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, microwave, etc.) to another website, computer, server or data center. Computer-readable storage media can be any available media that can be accessed by a computer or include one or more data storage devices such as servers and data centers that can be integrated with the media. Usable media may be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., DVDs), or semiconductor media (e.g., Such as solid state disk (SSD)), etc.

Although the present application has been described in conjunction with specific features and embodiments thereof, it will be apparent that various modifications and combinations may be made without departing from the spirit and scope of the application. Accordingly, the specification and drawings are intended to be merely illustrative of the application as defined by the appended claims and are to be construed to cover any and all modifications, variations, combinations or equivalents within the scope of the application. Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. In this way, if these modifications and variations of the present application fall within the scope of the claims of the present application and equivalent technologies, the present application is also intended to include these modifications and variations.

Claims

A backlight module, characterized in that it is applied to a display device, and the backlight module includes a plurality of light-emitting devices and a driving circuit connected to the plurality of light-emitting devices;

The driving circuit is used to obtain a first backlight control signal of the first image frame and a second backlight control signal of the second image frame, wherein the first backlight control signal includes each of the plurality of light-emitting devices. A switch signal corresponding to a light-emitting device, the second image frame is the previous image frame of the first image frame, and the second backlight control signal includes a switch corresponding to each light-emitting device in the plurality of light-emitting devices. Signal; switching the switching state of the light-emitting device corresponding to different switching signals in the first backlight control signal and the second backlight control signal.
The backlight module according to claim 1, characterized in that:

The first image frame is a left-eye image frame, and the light-emitting device corresponding to the switch state of the first backlight control signal is turned on to generate a first light beam, and the first light beam is transmitted to the left eye; the second image The frame is a right-eye image frame, and the light-emitting device corresponding to the switch state of the second backlight control signal is turned on to generate a second light beam, and the second light beam is transmitted to the right eye;

or,

The first image frame is a right-eye image frame, the light-emitting device corresponding to the switch state of the first backlight control signal is turned on and generates a first light beam, and the first light beam is transmitted to the right eye; the second image The frame is a left-eye image frame, and the light-emitting device whose switch state corresponds to the second backlight control signal is turned on generates a second light beam, and the second light beam is transmitted to the left eye.
The backlight module according to claim 1 or 2, characterized in that:

The driving circuit is also used to read the second backlight control signal in the cache.
The backlight module according to any one of claims 1-3, characterized in that:

The driving circuit is specifically configured to simultaneously switch the switching states of the light-emitting devices corresponding to different switching signals in the first backlight control signal and the second backlight control signal under the control of a clock signal, or, The switching states of the light-emitting devices corresponding to different switching signals in the second backlight control signal in the first backlight control signal are switched according to a predetermined sequence, where the predetermined sequence includes: row-by-row switching and column-by-column switching.
The backlight module according to any one of claims 1-4, characterized in that:

The driving circuit is also used to determine a switch signal in the first backlight control signal that is different from the second backlight control signal.
The backlight module according to claim 5, characterized in that:

The driving circuit is specifically configured to perform an XOR operation on the switching state corresponding to the switching signal of the same light-emitting device in the first backlight control signal and the second backlight control signal;

According to the result of the XOR operation, it is determined whether the switching signal of the same light-emitting device in the first backlight control signal and the second backlight control signal is the same.
A display device, characterized in that it includes a display panel and a backlight module according to any one of claims 1 to 6, wherein a light-emitting device in the backlight module generates a light beam and transmits it to the display panel, so that the The first image frame drives the display panel to display an image.
The display device according to claim 7, wherein the display device further comprises: an optical module located between the backlight module and the display panel;

The optical module is used to convert light corresponding to the first backlight control signal generated by the light-emitting device in the backlight module. The beam is transmitted to the left eye through the display panel, and the light beam corresponding to the second backlight control signal generated by the light-emitting device in the backlight module is transmitted to the right eye through the display panel;

or;

The optical module is used to transmit the light beam corresponding to the first backlight control signal generated by the light-emitting device in the backlight module to the right eye through the display panel, and generate the light beam generated by the light-emitting device in the backlight module. The light beam corresponding to the second backlight control signal is transmitted to the left eye through the display panel.
The display device according to claim 7 or 8, characterized in that the display device further includes a human eye detection device, and the human eye detection device has a field of view;

The human eye detection device is used to detect the human eye position of the first observer, and generate the first backlight control signal according to the human eye position of the first observer, and the human eye of the first observer is the first observer. The left eye or right eye of the first observer, the position of the human eye of the first observer is determined by the angle of the human eye of the first observer in the field of view, and the relationship between the human eye of the first observer and the human eye of the first observer. The distance between the display panels is determined.
The display device according to claim 7 or 8, characterized in that the display device further includes a human eye detection device, and the human eye detection device has a field of view;

The human eye detection device is used to detect the human eye position of the first observer, and generate the first sub-backlight control signal according to the human eye position of the first observer, and the human eye of the first observer is the first observer. The left or right eye of the first observer, the position of the human eye of the first observer is determined by the angle of the human eye of the first observer in the field of view, and the relationship between the human eye of the first observer and the The distance between the display panels is determined;

The human eye detection device is also used to detect the human eye position of the second observer, and generate a second sub-backlight control signal according to the human eye position of the second observer, and the human eye of the second observer is the second observation The left eye or right eye of the second observer, the position of the human eye of the second observer is determined by the angle of the human eye of the second observer in the field of view, and the relationship between the human eye of the second observer and the human eye of the second observer. The distance between the above display panels is determined;

The human eye detection device is further configured to generate the first backlight control signal according to the first sub-backlight control signal and the second sub-backlight control signal.
The display device according to claim 7 or 8, characterized in that, the display device further includes a control circuit, the control circuit is connected to the display panel, and the control circuit is connected to a driving circuit in the backlight module. connect;

The control circuit is used to compare the first image frame with the second image frame and determine at least one pixel group in the display panel, wherein each pixel group in the at least one pixel group , the difference between the number of assigned pixels corresponding to the first image frame and the number of assigned pixels corresponding to the second image frame is greater than a predetermined value; and is also used to obtain each of the at least one pixel group. The first backlight control signal corresponds to one pixel group.
A backlight control method, characterized in that it is applied to a display device, the display device includes a backlight module, and the backlight module includes a plurality of light-emitting devices;

The methods include:

Obtaining a first backlight control signal of the first image frame and a second backlight control signal of the second image frame, wherein the first backlight control signal includes a switching signal corresponding to each light-emitting device in the plurality of light-emitting devices. ; The second image frame is the previous image frame of the first image frame, and the second backlight control signal includes a switching signal corresponding to each light-emitting device in the plurality of light-emitting devices;

Switching the switching state of the light-emitting device corresponding to different switching signals in the first backlight control signal and the second backlight control signal.
The backlight control method according to claim 12, characterized in that:

The first image frame is a left-eye image frame, and the light-emitting device corresponding to the switch state of the first backlight control signal is turned on to generate a first light beam, and the first light beam is transmitted to the left eye; the second image The frame is a right-eye image frame, and the light-emitting device corresponding to the switch state of the second backlight control signal is turned on to generate a second light beam, and the second light beam is transmitted to the right eye;

or,

The first image frame is a right-eye image frame, the light-emitting device corresponding to the switch state of the first backlight control signal is turned on and generates a first light beam, and the first light beam is transmitted to the right eye; the second image The frame is a left-eye image frame, and the light-emitting device whose switch state corresponds to the second backlight control signal is turned on generates a second light beam, and the second light beam is transmitted to the left eye.
The backlight control method according to claim 12 or 13, characterized in that:

Before obtaining the first backlight control signal of the first image frame and the second backlight control signal of the second image frame, it also includes:

Detect the eye position of the first observer, and generate the first backlight control signal according to the eye position of the first observer. The human eye of the first observer is the left eye or the right eye of the first observer, so The position of the first observer's eyes is determined by the angle of the first observer's eyes in the field of view and the distance between the first observer's eyes and the display panel in the display device, Wherein, the field of view angle is the field of view angle of the human eye detection device in the display device.
The backlight control method according to claim 12 or 13, characterized in that:

Before obtaining the first backlight control signal of the first image frame and the second backlight control signal of the second image frame, it also includes:

Detecting the eye position of the first observer, and generating the first sub-backlight control signal according to the eye position of the first observer, where the human eye of the first observer is the left eye or the right eye of the first observer, the The position of the first observer's eyes is determined by the angle of the first observer's eyes in the field of view and the distance between the first observer's eyes and the display panel in the display device, where , the field of view angle is the field of view angle of the human eye detection device in the display device;

Detecting the eye position of the second observer, and generating a second sub-backlight control signal according to the eye position of the second observer, where the human eye of the second observer is the left eye or the right eye of the second observer, the The position of the second observer's eyes is determined by the angle of the second observer's eyes in the field of view and the distance between the second observer's eyes and the display panel in the display device. ;

The first backlight control signal is generated according to the first sub-backlight control signal and the second sub-backlight control signal.
The backlight control method according to claim 12 or 13, characterized in that:

Before obtaining the first backlight control signal of the first image frame and the second backlight control signal of the second image frame, it further includes: comparing the first image frame with the second image frame, determining the At least one pixel group in the display panel in the display device, wherein in each pixel group in the at least one pixel group, the sum of the number of assigned pixel points corresponding to the first image frame corresponds to the second image frame The difference in the number of assigned pixels is greater than the predetermined value;

The obtaining of the first backlight control signal of the first image frame and the second backlight control signal of the second image frame specifically includes obtaining all of the first image frame corresponding to each pixel group in the at least one pixel group. The first backlight control signal, and the second backlight control signal of the second image frame corresponding to each pixel group in the at least one pixel group.
The backlight control method according to any one of claims 12 to 16, characterized in that:

Before obtaining the first backlight control signal of the first image frame and the second backlight control signal of the second image frame, the method further includes:

The second backlight control signal is read in the cache.
The backlight control method according to any one of claims 12 to 17, characterized in that:

Switching the switching state of the light-emitting device corresponding to different switching signals in the first backlight control signal and the second backlight control signal specifically includes:

Under the control of a clock signal, switching states of the light-emitting devices corresponding to different switching signals in the first backlight control signal and the second backlight control signal are simultaneously switched, or the first backlight control signal is switched in a predetermined sequence. The switching states of the light-emitting devices in the backlight control signal correspond to different switching signals in the second backlight control signal, and the predetermined sequence includes: row-by-row switching and column-by-column switching.
The backlight control method according to any one of claims 12 to 18, characterized in that:

After obtaining the first backlight control signal of the first image frame and the second backlight control signal of the second image frame, the method further includes:

A switch signal in the first backlight control signal that is different from the second backlight control signal is determined.
The backlight control method according to claim 19, characterized in that:

Determining the switch signal in the first backlight control signal that is different from the second backlight control signal specifically includes:

Perform an XOR operation on the switching state corresponding to the switching signal of the same light-emitting device in the first backlight control signal and the second backlight control signal;

According to the result of the XOR operation, it is determined whether the switching signal of the same light-emitting device in the first backlight control signal and the second backlight control signal is the same.
A computer-readable storage medium, characterized in that the computer-readable storage medium includes computer instructions, and when the computer instructions are run on a computer, the computer is caused to execute as described in any one of claims 12-20 backlight control method.