WO2021249310A1 - Display module and driving method therefor, and display apparatus - Google Patents

Abstract

A display module and a driving method therefor, and a display apparatus, which relate to the technical field of display. The display module comprises an optical modulation structure (20) arranged on the light incident side of a display panel (10), wherein the display panel (10) comprises a texture identification device (111); when texture identification is performed, the optical modulation structure (20) receives an incident light ray provided by a backlight module, and converts the incident light ray at a target position into first polarized light, such that the first polarized light passes through the display panel (10) and irradiates an object (30) to be subjected to detection; the texture identification device (111) is configured to receive a light ray reflected by said object (30), so as to identify a texture image of said object (30); and in a preset area, incident light rays at positions other than a target position cannot enter the display panel (10).

Description

Display module and its driving method and display device

Cross-references to related applications

This disclosure requires the priority of a Chinese patent application filed with the Chinese Patent Office with an application number of 202010518562.0 and titled "A display module and its driving method, and display device" on June 9, 2020, the entire content of which is incorporated by reference In this disclosure.

Technical field

The present disclosure relates to the field of display technology, and in particular to a display module, a driving method thereof, and a display device.

Background technique

With the continuous development of display technology, display devices are widely used in people's lives and work. In the process of using display devices, such as online shopping, payment, etc., the security of the display device is very important to the user experience. Big impact.

At present, many display devices use pattern recognition devices on the array substrate to improve the safety of the display device. During the pattern recognition, the light emitted by the backlight module passes through the lower polarizer, the array substrate, the liquid crystal layer and the color film substrate. , The upper polarizer is selectively transmitted, so that the light of some pixels passes through the display panel and irradiates the object to be detected, while other parts of the light does not pass through the display panel. The light irradiated on the object to be detected will occur Reflect, the reflected light irradiates the pattern recognition device for pattern recognition.

Overview

The present disclosure provides a display module, a driving method thereof, and a display device.

The present disclosure discloses a display module, including: a display panel and an optical modulation structure arranged on the light incident side of the display panel, the display panel including a pattern recognition device;

The optical modulation structure is configured to receive incident light provided by the backlight module when performing pattern recognition, and convert the incident light at the target position in the preset area into first polarized light, so that the first polarized light Polarized light passes through the display panel and irradiates the object to be detected on the light-emitting side of the display panel;

The pattern recognition device is configured to receive the light reflected from the object to be detected, so as to recognize the pattern image of the object to be detected;

Wherein, in the preset area, the incident light at other positions except the target position cannot enter the inside of the display panel.

Optionally, the optical modulation structure includes a first substrate and a second substrate disposed opposite to each other, a first electrode layer and a second electrode layer disposed between the first substrate and the second substrate, and The first liquid crystal layer between the first electrode layer and the second electrode layer, the first substrate is disposed on a side of the second substrate away from the display panel;

The optical modulation structure further includes a first polarizer disposed on a side of the first substrate away from the first electrode layer, and the first polarizer is configured to convert incident light provided by the backlight module into First linear polarized light; and

The first liquid crystal layer is configured to, under the control of the first electrode layer and the second electrode layer, convert the first linearly polarized light at a target position in the preset area into the second One polarized light.

Optionally, the first electrode layer includes a plurality of first electrodes distributed in an array,

The optical modulation structure further includes driving transistors corresponding to the first electrodes and connected to each other in a one-to-one correspondence.

Optionally, part or all of the first electrodes of the plurality of first electrodes have openings that penetrate the first electrodes, and the target position is a position where part or all of the openings are located.

Optionally, the optical modulation structure further includes a plurality of gate lines distributed in a row direction and a plurality of data lines distributed in a column direction;

Each of the gate lines is connected to the gate of the corresponding driving transistor, each of the data lines is connected to the source of the corresponding driving transistor, and the drain of the driving transistor is connected to the first electrode ;and

The plurality of gate lines are connected with the gate driving chip, and the plurality of data lines are connected with the source driving chip.

Optionally, the first electrode layer is at least one first surface electrode, each of the first surface electrodes has a plurality of openings penetrating the first surface electrode, and the target position is part or all of the The location of the opening.

Optionally, the aperture of the opening is 0.05 mm to 0.5 mm, and the separation distance between two adjacent openings is 0.3 mm to 15 mm.

Optionally, the liquid crystal molecules of the first liquid crystal layer are any one of positive liquid crystal molecules, negative liquid crystal molecules, and twisted nematic liquid crystal molecules.

Optionally, the display panel includes an array substrate and a color filter substrate that are opposed to each other, and a second liquid crystal layer is provided between the array substrate and the color filter substrate, and is provided on the array substrate away from the second liquid crystal layer. A second polarizer on one side of the liquid crystal layer, and a third polarizer disposed on the side of the color filter substrate away from the second liquid crystal layer;

Wherein, the pattern recognition device is arranged in the array substrate.

Optionally, the direction of the light transmission axis of the first polarizer is consistent with the direction of the light transmission axis of the third polarizer;

The transmission axis of the second polarizer is perpendicular to the transmission axis of the first polarizer and the direction of the transmission axis of the third polarizer.

Optionally, the first polarized light is elliptically polarized light or second linearly polarized light;

The second linearly polarized light is rotated by 90° with respect to the first linearly polarized light.

Optionally, there are multiple target locations in the preset area, and the multiple target locations are distributed in a matrix or a mosaic array.

Optionally, the display module further includes a to-be-detected object recognition component;

The object to be detected recognition component is configured to recognize the contact area of the object to be detected and the display panel to determine the designated area where the target position is located;

Wherein, the object recognition component to be detected is a touch function layer.

Optionally, the optical modulation structure is further configured to convert incident light at positions other than the target position in the preset area into a second polarized light, and the second polarized light cannot be incident on the Describe the inside of the display panel.

Optionally, the pattern recognition device is a fingerprint recognition device or a palmprint recognition device.

The present disclosure also discloses a driving method of a display module, which is applied to drive the above-mentioned display module, and the driving method includes:

When performing the pattern recognition, the optical modulation structure is controlled to convert the incident light provided by the backlight module at the target position in the preset area into the first polarized light, so that the first polarized light passes through the display panel and irradiates the On the object to be detected on the light emitting side of the display panel; and

According to the light reflected by the object to be detected, the grain image of the object to be detected is identified.

Optionally, when the first electrode layer in the optical modulation structure includes a plurality of first electrodes distributed in an array, and the optical modulation structure further includes driving transistors that correspond to the first electrodes one-to-one and are connected to each other When the pattern recognition is performed, the step of controlling the optical modulation structure to convert the incident light provided by the backlight module at the target position in the preset area into the first polarized light includes:

When performing the pattern recognition, based on the first electrode connected to each of the driving transistors, the incident light at each target position is sequentially controlled to be converted into the first polarized light.

The present disclosure also discloses a computing processing device, including:

A memory in which computer-readable codes are stored; and

One or more processors, and when the computer-readable code is executed by the one or more processors, the computing processing device executes the above-mentioned driving method of the display module.

The present disclosure also discloses a computer program, including computer readable code, which when the computer readable code runs on a computing processing device, causes the computing processing device to execute the above-mentioned driving method of the display module.

The present disclosure also discloses a non-volatile computer-readable storage medium in which the above-mentioned computer program is stored.

The present disclosure also discloses a display device, including a backlight module and the above-mentioned display module, the backlight module being arranged on a side of the optical modulation structure away from the display panel.

Optionally, the backlight module is an edge-type backlight module or a direct-type backlight module.

The above description is only an overview of the technical solutions of the present disclosure. In order to understand the technical means of the present disclosure more clearly, they can be implemented in accordance with the content of the specification, and in order to make the above and other objectives, features and advantages of the present disclosure more obvious and understandable. In the following, specific embodiments of the present disclosure are specifically cited.

Brief description of the drawings

In order to more clearly describe the technical solutions in the embodiments of the present disclosure or related technologies, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or related technologies. Obviously, the accompanying drawings in the following description are of the present invention. For some of the disclosed embodiments, those of ordinary skill in the art can obtain other drawings based on these drawings without creative work.

FIG. 1 shows a schematic structural diagram of a display module according to an embodiment of the present disclosure;

FIG. 2 shows a schematic structural diagram of a first electrode layer of a first type according to an embodiment of the present disclosure;

FIG. 3 shows a schematic structural diagram of a second type of first electrode layer according to an embodiment of the present disclosure;

FIG. 4 shows a schematic structural diagram of a third type of first electrode layer according to an embodiment of the present disclosure;

FIG. 5 shows a schematic structural diagram of a fourth type of first electrode layer according to an embodiment of the present disclosure;

FIG. 6 shows a schematic diagram of the position of the pattern recognition position on the display panel in an embodiment of the present disclosure;

Fig. 7 shows a cross-sectional view along the section A-A' shown in Fig. 6;

FIG. 8 shows a schematic plan view of a display panel according to an embodiment of the present disclosure;

Fig. 9 shows a cross-sectional view along the section B-B' shown in Fig. 8;

Fig. 10 shows a cross-sectional view along the section C-C' shown in Fig. 8;

Figure 11 shows a schematic structural diagram of another display module;

FIG. 12 shows a flowchart of a driving method of a display module according to an embodiment of the present disclosure;

FIG. 13 shows a schematic structural diagram of a display device according to an embodiment of the present disclosure;

FIG. 14 shows a schematic structural diagram of a backlight module according to an embodiment of the present disclosure;

FIG. 15 schematically shows a block diagram of a computing processing device for executing the method according to the present disclosure; and

FIG. 16 schematically shows a storage unit for holding or carrying program codes for implementing the method according to the present disclosure.

A detailed description

In order to make the above objectives, features, and advantages of the present disclosure more obvious and understandable, the present disclosure will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by a person of ordinary skill in the art without creative work shall fall within the protection scope of the present disclosure.

1, there is shown a schematic structural diagram of a display module according to an embodiment of the present disclosure.

The embodiment of the present disclosure provides a display module, including: a display panel 10 and an optical modulation structure 20 arranged on the light incident side of the display panel 10. The display panel 10 includes a pattern recognition device 111; and the optical modulation structure 20 is configured to During the pattern recognition, the incident light provided by the backlight module is received, and the incident light at the target position in the preset area is converted into the first polarized light, so that the first polarized light passes through the display panel 10 and is irradiated to the display panel. 10 on the object 30 to be detected on the light emitting side; the pattern recognition device 111 is configured to receive the light reflected by the object 30 to be detected to identify the pattern image of the object 30 to be detected; wherein, in the preset area, except for the target position The incident light at other positions cannot enter the inside of the display panel 10.

It is worth noting that the target locations are only distributed in the preset area.

In the embodiment of the present disclosure, when performing pattern recognition, the backlight module serves as a surface light source to provide incident light to the optical modulation structure 20, and the incident light provided by the backlight module is natural light, and the incident light uniformly irradiates the optical modulation structure 20 , The optical modulation structure 20 receives the incident light provided by the backlight module, and converts the incident light at the target position in the preset area into the first polarized light, so that the first polarized light at the target position in the preset area can be incident To the inside of the liquid crystal cell of the display panel 10 and pass through the display panel 10 to irradiate the object to be detected 30, and in the preset area, the incident light at positions other than the target position cannot enter the inside of the liquid crystal cell of the display panel 10. The first polarized light irradiated on the object 30 to be detected is reflected on the surface of the object 30 to be detected, and the reflected light is irradiated on the pattern recognition device 111 in the display panel 10, and the pattern recognition device 111 receives the reflected light from the object 30 to be inspected. The light rays are used to identify the texture image of the object 30 to be detected according to the light reflected by the object 30 to be detected.

It is worth noting that the preset area in the embodiment of the present disclosure may be the area where the entire display panel 10 is located, and the target positions are distributed in the area where the entire display panel 10 is located.

The preset area in the embodiment of the present disclosure may also be a designated area, where the designated area is defined as being smaller than the area where the display panel 10 is located, is included in the area where the display panel 10 is located, and can be set in the area where the display panel 10 is located. Any position, its shape and size can also be adjusted according to actual needs. The designated area can be a fixed location area, or the designated area location can be selected according to the situation each time the pattern is recognized. The pattern recognition function can be realized in the designated area, and the target position is distributed in the designated area.

When the target positions are distributed in the designated area, the display effect of the display panel 10 can be improved relative to the area where the entire display panel 10 is located. The reason is that if the target positions are distributed in the area where the entire display panel 10 is located, During the pattern recognition, the light transmission position of the entire display panel 10 is the target position, so that the display brightness of the entire display panel 10 is greatly reduced. After the pattern recognition, the display brightness of the display panel 10 returns to normal. The panel 10 flickers during the pattern recognition process, and when the target position is set in the designated area, only the incident light from other positions in the designated area except the target position cannot enter the interior of the display panel 10, and the positions outside the designated area and The incident light at the target position is all converted into the first polarized light, so that the first polarized light passes through the display panel 10. Therefore, while ensuring the pattern recognition, the display brightness at a position outside the designated area is normal. In addition, although the light at a location outside the designated area can pass through the display panel 10, this part of the light can be designed to be far away from the target location, which has little effect on the saturation of the pattern recognition device.

Preferably, the designated area may be set to be approximately equal to the contact area between the object 30 to be detected and the display panel 10. The approximation here can be understood as that the designated area is slightly larger or smaller than the contact area between the object 30 to be detected and the display panel 10, as long as the normal pattern recognition function can be realized. This setting can accurately divide the designated area during the pattern detection, while ensuring the pattern recognition, the display brightness at the position outside the designated area is normal, and the display effect is further improved.

Preferably, the display module further includes a to-be-detected object recognition component, which is configured to recognize the contact area between the to-be-detected object and the display panel 10 to determine the designated area where the target position is located; wherein, the to-be-detected object recognition component It is the touch function layer.

By setting the object recognition component to be detected in the display module, it is used to identify the contact area of the object 30 to be detected and the display panel 10, so as to realize the precise positioning and division of the designated area, and then determine the target position.

Specifically, the optical modulation structure 20 can convert incident light at positions other than the target position in the preset area into the second polarized light. The second polarized light cannot enter the liquid crystal cell of the display panel 10 and pass through the display panel. 10.

By shielding unnecessary and easy to cause noise stray light through the optical modulation structure 20, in the preset area, only the first polarized light at the target position can enter the inside of the liquid crystal cell of the display panel 10 to realize the pattern recognition, even if the target The first polarized light at the position is totally reflected on the side of the color film substrate, and the intensity of the light that is totally reflected to the pattern recognition device 111 is also weak. Therefore, the incident light provided by the backlight module can be effectively reduced on the side of the color film substrate. The ineffective light intensity generated during total reflection prevents the pattern recognition device 111 from being saturated, so that pattern recognition can be realized.

It is understandable that when performing pattern recognition, the incident light provided by the backlight module is a surface light source. In the related art, the light entering the liquid crystal cell is still a surface light source. However, the embodiment of the present disclosure uses the optical modulation structure 20 to pre- Set the area so that only the incident light at the target position can enter the inside of the liquid crystal cell, that is, in the preset area, the surface light source of the backlight module is converted into a point light source, and the position of the point light source is the target position.

Wherein, the pattern recognition device 111 may be a fingerprint recognition device or a palmprint recognition device, etc. Correspondingly, the object 30 to be detected is a finger or a palm, and the pattern image is a fingerprint image or a palmprint image.

For example, if the pattern recognition device 111 is a fingerprint recognition device, and the object 30 to be detected is a finger, and the pattern image is a fingerprint image, since the fingerprint of the finger has fingerprint valleys and fingerprint ridges, when the first polarized light at the target position passes through the display When the panel 10 is irradiated on the fingerprint of the finger, the degree of reflection at the fingerprint valley and the fingerprint ridge is different, so that the fingerprint valley and fingerprint ridge-direction pattern recognition device 111 reflect back light with different light intensities. The pattern recognition device 111 combines the fingerprint valley and the fingerprint ridge. The reflected light is converted into electrical signals to generate fingerprint images. Correspondingly, the palmprint image recognition principle is similar to the fingerprint image recognition principle, so I won't repeat it here.

Further, the optical modulation structure 20 includes a first substrate 21 and a second substrate 22 disposed opposite to each other, a first electrode layer 23 and a second electrode layer 24 disposed between the first substrate 21 and the second substrate 22, and The first liquid crystal layer 25 between the first electrode layer 23 and the second electrode layer 24, the optical modulation structure 20 further includes a first polarizer 26 disposed on the side of the first substrate 21 away from the first electrode layer 23, the first substrate 21 is arranged on the side of the second substrate 22 away from the display panel 10; the first polarizer 26 is configured to convert incident light provided by the backlight module into first linearly polarized light; the first liquid crystal layer 25 is configured to Under the control of the one electrode layer 23 and the second electrode layer 24, the first linearly polarized light at the target position in the preset area is converted into the first polarized light.

In the embodiment of the present disclosure, the first substrate 21 and the second substrate 22 may be glass substrates, and the materials of the first electrode layer 23 and the second electrode layer 24 are transparent conductive materials, such as indium tin oxide (ITO) Or indium zinc oxide (Indium Zinc Oxide, IZO), etc., the second electrode layer 24 is a surface electrode.

As shown in FIG. 1, the first electrode layer 23 is provided on the side of the first substrate 21 close to the second substrate 22, and the second electrode layer 24 is provided on the side of the second substrate 22 close to the first substrate 21.

At this time, the incident light provided by the backlight module passes through the first polarizer 26 in the optical modulation structure 20 to become the first linearly polarized light. The first linearly polarized light sequentially passes through the first substrate 21 and the first electrode layer 23 and irradiates the first On the liquid crystal layer 25, when performing pattern recognition, a certain voltage is applied to the first electrode layer 23 and the second electrode layer 24, so that the first linearly polarized light at the target position in the preset area is converted into the first polarized light, and The light at other positions in the preset area except the target position is still the first linearly polarized light. Wherein, the first polarized light can enter the inside of the liquid crystal cell of the display panel 10, while the first linearly polarized light cannot enter the inside of the liquid crystal cell of the display panel 10.

It should be noted that the positions of the first electrode layer 23 and the second electrode layer 24 can also be interchanged, that is, the second electrode layer 24 is arranged on the side of the first substrate 21 close to the second substrate 22, and the first electrode layer 23 It is arranged on the side of the second substrate 22 close to the first substrate 21.

As shown in FIG. 2, the first electrode layer 23 includes a plurality of first electrodes 231 distributed in an array. Some or all of the first electrodes 231 of the plurality of first electrodes 231 have openings 232 passing through the first electrodes 231, and the target position It is the position where part or all of the opening 232 is located; the optical modulation structure 20 further includes a driving transistor 27 corresponding to the first electrode 231 and connected to each other.

In addition, the optical modulation structure 20 also includes a plurality of gate lines 41 distributed along the row direction and a plurality of data lines 42 distributed along the column direction. Each gate line 41 is connected to the gate of the corresponding driving transistor 27, and each data line 42 is connected to the source of the corresponding driving transistor 27, and the drain of the driving transistor 27 is connected to the first electrode 231; and all the gate lines 41 are connected to the gate driving chip 43, and all the data lines 42 are connected to the source driving chip. 44 connections.

In the first electrode layer 23 shown in FIG. 2, the liquid crystal molecules of the corresponding first liquid crystal layer 25 may be positive liquid crystal molecules or twisted nematic liquid crystal molecules.

Taking the liquid crystal molecules of the first liquid crystal layer 25 as positive liquid crystal molecules as an example, when it is detected that pattern recognition is required, the gate driving chip 43 provides a gate signal to each gate line 41 in a preset area to turn on each gate line 41. The transistor 27 is driven, and at the same time, the source driving chip 44 provides a data signal to each data line 42 so as to provide a first voltage to the first electrode 231. In the preset area, since there is no first electrode 231 at the position corresponding to the opening 232, no voltage is applied to the liquid crystal molecules at the position corresponding to the opening 232 in the preset area. Therefore, the opening 232 in the preset area corresponds to the position The liquid crystal molecules at the position are not deflected, and the first linearly polarized light at the position corresponding to the opening 232 in the preset area sequentially passes through the first substrate 21, the first electrode layer 23 and the first liquid crystal layer 25 and then becomes elliptically polarized light. Light can enter the liquid crystal cell of the display panel 10 through the second electrode layer 24 and the second substrate 22, that is, the light at the position corresponding to the opening 232 in the preset area can enter the liquid crystal cell of the display panel 10; It is assumed that the first electrode 231 is provided at other positions in the area except the opening 232, the first voltage is applied to the first electrode 231 through the driving transistor 27, and the voltage applied by the second electrode layer 24 is the second voltage, the first voltage and If there is a certain voltage difference between the second voltage, the liquid crystal molecules at the corresponding position of the first electrode 231 will be deflected under the voltage applied by the first electrode 231 and the second electrode layer 24, and the liquid crystal molecules at the corresponding position of the first electrode 231 will be deflected. Aligned in a direction perpendicular to the first substrate 21, therefore, the first linearly polarized light at positions other than the corresponding position of the opening 232 in the preset area sequentially passes through the first substrate 21, the first electrode layer 23, and the first liquid crystal layer 25 After that, its polarization has not changed, and it is still the first linearly polarized light. The first linearly polarized light cannot enter the liquid crystal cell of the display panel 10 through the second electrode layer 24 and the second substrate 22, that is, the opening 232 is excluded in the preset area. The light at positions other than the corresponding position cannot enter the inside of the liquid crystal cell of the display panel 10.

Taking the liquid crystal molecules of the first liquid crystal layer 25 as twisted nematic liquid crystal molecules as an example, when it is detected that pattern recognition is required, the gate driving chip 43 provides a gate signal to each gate line 41 in a preset area. Each driving transistor 27 is turned on, and at the same time, the source driving chip 44 provides a data signal to each data line 42 so as to provide a first voltage to the first electrode 231. Since there is no first electrode 231 at the position corresponding to the opening 232 in the preset area, no voltage is applied to the liquid crystal molecules at the position corresponding to the opening 232 in the preset area. Therefore, the opening 232 in the preset area corresponds to the position The liquid crystal molecules are in a twisted state, and the first linearly polarized light at the position corresponding to the opening 232 in the preset area sequentially passes through the first substrate 21, the first electrode layer 23 and the first liquid crystal layer 25 and then rotates 90° to become the second linearly polarized light. The second linearly polarized light can pass through the second electrode layer 24 and the second substrate 22 and enter the liquid crystal cell of the display panel 10, that is, the light at the position corresponding to the opening 232 in the preset area can enter the liquid crystal cell of the display panel 10; The first electrode 231 is provided at other positions in the preset area except the opening 232, and the first voltage is applied to the first electrode 231 through the driving transistor 27, and the voltage applied by the second electrode layer 24 is the second voltage. There is a certain voltage difference between the voltage and the second voltage, and the liquid crystal molecules at the corresponding position of the first electrode 231 are arranged in a direction perpendicular to the first substrate 21 under the voltage applied by the first electrode 231 and the second electrode layer 24, After the first linearly polarized light at positions other than the corresponding position of the opening 232 in the preset area passes through the first substrate 21, the first electrode layer 23, and the first liquid crystal layer 25 in sequence, the polarization of the first linearly polarized light remains unchanged. A linearly polarized light, the first linearly polarized light cannot enter the liquid crystal cell of the display panel 10 through the second electrode layer 24 and the second substrate 22, that is, the light at other positions in the preset area except the corresponding position of the opening 232 cannot enter Inside the liquid crystal cell of the display panel 10.

It should be noted that the voltage applied to the second electrode layer 24 is 0V, and the voltage difference between the first electrode 231 and the second electrode layer 24 is controlled by the data signal provided by the source driving chip 44 to the source of the driving transistor 27. For the first electrode layer 23 shown in FIG. 2, when the liquid crystal molecules of the corresponding first liquid crystal layer 25 are positive liquid crystal molecules or twisted nematic liquid crystal molecules, the first electrode 231 and the second electrode layer 24 are applied The voltage difference can be 3 to 10V, that is, the voltage applied to the first electrode 231 is 3 to 10V, so that the light at other positions in the preset area except the corresponding position of the opening 232 cannot enter the liquid crystal of the display panel 10. Inside the box.

In FIG. 2, when the preset area is a designated area of a fixed position, for a position outside the designated area, the driving transistor 27 provides the corresponding first electrode 231 with a voltage signal of the same voltage value as the second electrode layer 24. So that the first linearly polarized light at a position outside the designated area sequentially passes through the first substrate 21, the first electrode layer 23 and the first liquid crystal layer 25 and then becomes elliptically polarized light or second linearly polarized light. The elliptically polarized light or the second linearly polarized light can pass through The second electrode layer 24 and the second substrate 22 enter the liquid crystal cell of the display panel 10.

It should be noted that when the preset area is the area where the entire display panel 10 is located, the target location is the location where all the openings 232 are located; when the preset area is the designated area, the target location is the location where part of the openings 232 are located. When performing pattern recognition, in the designated area, only the light at the position corresponding to the opening 232 can enter the liquid crystal cell of the display panel 10, and the light at other positions in the designated area except the opening 232 cannot enter the display panel 10. Inside the liquid crystal cell, at this time, the light at a position outside the designated area normally enters the inside of the display panel, but this part of the light has little effect on the saturation of the pattern recognition device.

During the pattern recognition, when the preset area is the area where the entire display panel 10 is located, the target position may be the position where all the openings 232 are located. During the pattern recognition, the light at the target position can enter the liquid crystal cell of the display panel 10, and the light of the first electrode 231 at a position other than the target position cannot enter the liquid crystal cell of the display panel 10. This structural design can effectively reduce the ineffective light intensity generated when the incident light provided by the backlight module is totally reflected on the color film substrate side, avoid the saturation of the pattern recognition device, and realize the pattern recognition.

When the preset area is the designated area, the target position is the position where the opening 232 in the designated area is located. During the pattern recognition, the light at the target position in the designated area can enter the liquid crystal box of the display panel 10, and the light at the position other than the target position in the designated area cannot enter the liquid crystal box of the display panel 10. In the designated area, this structural design can effectively reduce the invalid light intensity generated when the incident light provided by the backlight module is totally reflected on the color film substrate side, avoid the saturation of the pattern recognition device, and realize the pattern recognition. The light at a location outside the designated area normally enters the inside of the display panel and can be displayed normally. However, the light at a position outside the designated area has little effect on the saturation of the pattern recognition device in the designated area. Therefore, it is possible to realize effective pattern recognition while realizing normal display.

As shown in FIG. 3, the first electrode layer 23 includes a plurality of first electrodes 231 distributed in an array, and the optical modulation structure 20 further includes driving transistors 27 that correspond to the first electrodes 231 one-to-one and are connected to each other.

The difference between the first electrode layer 23 shown in FIG. 3 and the first electrode layer 23 shown in FIG. 2 is that some or all of the first electrodes 231 in the first electrodes 231 shown in FIG. Openings 232, and all the first electrodes 231 shown in FIG. 3 have no openings.

In FIG. 3, the optical modulation structure 20 further includes a plurality of gate lines 41 distributed along the row direction and a plurality of data lines 42 distributed along the column direction. Each gate line 41 is connected to the gate of a corresponding driving transistor 27, and each One data line 42 is connected to the source of the corresponding driving transistor 27, and the drain of the driving transistor 27 is connected to the first electrode 231; and all the gate lines 41 are connected to the gate driving chip 43, and all the data lines 42 are connected to the source The pole drive chip 44 is connected.

In the first electrode layer 23 shown in FIG. 3, the liquid crystal molecules of the corresponding first liquid crystal layer 25 may be any one of positive liquid crystal molecules, negative liquid crystal molecules, and twisted nematic liquid crystal molecules.

If the liquid crystal molecules of the first liquid crystal layer 25 are positive liquid crystal molecules, the driving transistor 27 provides the first electrode 231 at the target position in the predetermined area with a voltage signal of the same voltage value as the second electrode layer 24, and the It is assumed that the liquid crystal molecules at the target position in the area are not deflected, and the first linearly polarized light at the target position in the preset area sequentially passes through the first substrate 21, the first electrode layer 23 and the first liquid crystal layer 25 and then becomes elliptically polarized. Light, elliptically polarized light can pass through the second electrode layer 24 and the second substrate 22 and enter the inside of the liquid crystal cell of the display panel 10; and the first electrode 231 at the position other than the target position in the preset area provides the same With voltage signals of different voltage values of the second electrode layer 24, the liquid crystal molecules at positions other than the target position in the preset area are deflected, and the first linearly polarized light at positions other than the target position in the preset area passes through in turn After the first substrate 21, the first electrode layer 23 and the first liquid crystal layer 25, its polarization has not changed, and it is still the first linearly polarized light. The first linearly polarized light cannot enter through the second electrode layer 24 and the second substrate 22 Inside the liquid crystal cell of the display panel 10.

If the liquid crystal molecules of the first liquid crystal layer 25 are negative liquid crystal molecules, the driving transistor 27 provides the first electrode 231 at the target position in the predetermined area with a voltage signal with a voltage value different from that of the second electrode layer 24. It is assumed that the liquid crystal molecules at the target position in the area are deflected, and the first linearly polarized light at the target position in the preset area sequentially passes through the first substrate 21, the first electrode layer 23 and the first liquid crystal layer 25 and then becomes elliptically polarized light. The elliptically polarized light can pass through the second electrode layer 24 and the second substrate 22 and enter the liquid crystal cell of the display panel 10; and the first electrode 231 at other positions in the preset area except the target position provides the same With the same voltage signal of the two electrode layers 24, the liquid crystal molecules at positions other than the target position in the preset area will not be deflected, and the liquid crystal molecules at positions other than the target position in the preset area are perpendicular to the first The direction of a substrate 21 is arranged. After the first linearly polarized light at other positions except the target position in the preset area passes through the first substrate 21, the first electrode layer 23 and the first liquid crystal layer 25 in sequence, the polarization of the first linearly polarized light remains unchanged , It is still the first linearly polarized light, and the first linearly polarized light cannot enter the liquid crystal cell of the display panel 10 through the second electrode layer 24 and the second substrate 22.

If the liquid crystal molecules of the first liquid crystal layer 25 are twisted nematic liquid crystal molecules, the driving transistor 27 provides the first electrode 231 at the target position in the preset area with a voltage signal of the same voltage value as that of the second electrode layer, then The liquid crystal molecules at the target position in the preset area are in a twisted state, and the first linearly polarized light at the target position in the preset area sequentially passes through the first substrate 21, the first electrode layer 23 and the first liquid crystal layer 25 and then rotates 90° The second linearly polarized light can pass through the second electrode layer 24 and the second substrate 22 and enter the liquid crystal cell of the display panel 10; and the first electrode 231 at other positions in the preset area except the target position Provided is a voltage signal with a voltage value different from that of the second electrode layer 24, and the liquid crystal molecules at positions other than the target position in the preset area are arranged in a direction perpendicular to the first substrate 21, and the preset area except the target position After the first linearly polarized light at other positions passes through the first substrate 21, the first electrode layer 23, and the first liquid crystal layer 25 in sequence, its polarization has not changed. It is still the first linearly polarized light, and the first linearly polarized light passes through the second The second electrode layer 24 and the second substrate 22 cannot enter the inside of the liquid crystal cell of the display panel 10.

In FIG. 3, when the preset area is a designated area of a fixed position, for a position outside the designated area, the voltage signal provided to the corresponding first electrode 231 through the driving transistor 27 is maintained with the voltage signal provided at the target position. Consistent, that is, positive liquid crystal molecules and twisted nematic liquid crystal molecules. The first electrode 231 at a position outside the designated area provides a voltage signal with the same voltage value as the second electrode layer 24. For negative liquid crystal molecules, the designated area The first electrode 231 at the outer position provides a voltage signal with a voltage value different from that of the second electrode layer 24, so that the first linearly polarized light at a position outside the designated area sequentially passes through the first substrate 21, the first electrode layer 23, and the After the first liquid crystal layer 25 becomes elliptically polarized light or second linearly polarized light, the elliptically polarized light or the second linearly polarized light can pass through the second electrode layer 24 and the second substrate 22 and enter the liquid crystal cell of the display panel 10.

When performing pattern recognition, when the preset area is the area where the entire display panel 10 is located, the target position may be the position where part of the first electrode 231 is located, and the target position may be evenly distributed in the area where the entire display panel 10 is located. The target positions are separated from each other by the remaining first electrodes 231 except for the part of the first electrodes 231. During the pattern recognition, the light at the target position can enter the liquid crystal cell of the display panel 10, and the light at the position where the remaining first electrode 231 is located cannot enter the liquid crystal cell of the display panel 10. This structural design can effectively reduce the ineffective light intensity generated when the incident light provided by the backlight module is totally reflected on the color film substrate side, avoid the saturation of the pattern recognition device, and realize the pattern recognition.

When the preset area is a designated area, the target position is the position where a part of the first electrode 231 in the designated area is located, and the target position can be evenly distributed in the designated area. The remaining first electrodes 231 other than 231 are spaced apart from each other. During the pattern recognition, the light at the position of the part of the first electrode 231 in the designated area can enter the liquid crystal cell of the display panel 10, and the light at the position of the remaining first electrode 231 in the designated area cannot enter. To the inside of the liquid crystal cell of the display panel 10. In the designated area, this structural design can effectively reduce the invalid light intensity generated when the incident light provided by the backlight module is totally reflected on the color film substrate side, avoid the saturation of the pattern recognition device, and realize the pattern recognition. The light at a location outside the designated area normally enters the inside of the display panel, and the display can be performed normally. However, the light at a position outside the designated area has little effect on the saturation of the pattern recognition device in the designated area. Therefore, it is possible to realize effective pattern recognition while realizing normal display.

As shown in FIGS. 4 and 5, the first electrode layer 23 is at least one first surface electrode, each first surface electrode has a plurality of openings 232 penetrating the first surface electrode, and the target position is where part or all of the openings 232 are located. s position.

For the first electrode layer 23 shown in FIGS. 4 and 5, there is no need to provide structure such as driving transistors, gate lines, data lines, etc. in the optical modulation structure 20, and the voltage applied on the first electrode layer 23 is controlled only by a clock signal. The liquid crystal molecules of the corresponding first liquid crystal layer 25 may be positive liquid crystal molecules or twisted nematic liquid crystal molecules.

If the liquid crystal molecules of the first liquid crystal layer 25 are positive liquid crystal molecules, a voltage signal with a voltage value different from that of the second electrode layer 24 is provided to the first surface electrode in the preset area, because the position corresponding to the opening 232 in the preset area Where there is no first surface electrode, the first linearly polarized light at the position corresponding to the opening 232 in the preset area sequentially passes through the first substrate 21, the first electrode layer 23 and the first liquid crystal layer 25 and then becomes elliptically polarized light. Light can pass through the second electrode layer 24 and the second substrate 22 and enter the inside of the liquid crystal cell of the display panel 10; the first linearly polarized light at positions other than the position corresponding to the opening 232 in the preset area sequentially passes through the first substrate 21, After the first electrode layer 23 and the first liquid crystal layer 25, their polarization has not changed, and remains the first linearly polarized light. The first linearly polarized light cannot enter the liquid crystal of the display panel 10 through the second electrode layer 24 and the second substrate 22. Inside the box.

If the liquid crystal molecules of the first liquid crystal layer 25 are twisted nematic liquid crystal molecules, a voltage signal that provides a voltage value different from that of the second electrode layer 24 is applied to the first surface electrode in the predetermined area, due to the opening 232 in the predetermined area There is no first surface electrode at the corresponding position, then the first linearly polarized light at the position corresponding to the opening 232 in the preset area sequentially passes through the first substrate 21, the first electrode layer 23 and the first liquid crystal layer 25 and then becomes the second linearly polarized light , The second linearly polarized light can pass through the second electrode layer 24 and the second substrate 22 and enter the liquid crystal cell of the display panel 10; the first linearly polarized light at other positions in the preset area except the corresponding position of the opening 232 passes through the first After the substrate 21, the first electrode layer 23 and the first liquid crystal layer 25, the polarization of the light remains unchanged, and remains the first linearly polarized light. The first linearly polarized light cannot enter the display panel through the second electrode layer 24 and the second substrate 22 10 inside the LCD box.

When the preset area is the area where the entire display panel 10 is located, the area where the first surface electrode is located includes the area where the entire display panel 10 is located. During the pattern recognition, the light from the opening 232 can enter the liquid crystal cell of the display panel 10, and the light at the first surface electrode cannot enter the liquid crystal cell of the display panel 10. This structural design can effectively reduce the ineffective light intensity generated when the incident light provided by the backlight module is totally reflected on the color film substrate side, and avoid the saturation of the pattern recognition device, thereby realizing the pattern recognition.

When the preset area is a designated area of a fixed position, the first surface electrode is located in the area where the entire designated area is located, and the target position is the position where all the openings 232 on the first surface electrode are located. The light at the position of the opening 232 in the designated area can enter the liquid crystal cell of the display panel 10, and the light at other positions in the designated area cannot enter the liquid crystal cell of the display panel 10. In the designated area, this structural design can effectively reduce the invalid light intensity generated when the incident light provided by the backlight module is totally reflected on the color film substrate side, avoid the saturation of the pattern recognition device, and realize the pattern recognition. The light at a location outside the designated area normally enters the inside of the display panel, and the display can be performed normally. However, the light at a position outside the designated area has little effect on the saturation of the pattern recognition device in the designated area. Therefore, it is possible to realize effective pattern recognition while realizing normal display.

It can be understood that, in the designated area of the fixed position, the first surface electrode may be provided in multiple, and when the pattern recognition is performed, the voltage signal provided by each first surface electrode is the same.

It can be understood that multiple first surface electrodes may be distributed in the entire area where the display panel 10 is located. When the designated area is determined, apply a voltage signal that provides a different voltage value from the second electrode layer 24 to the first surface electrode in the designated area. Outside the designated area, apply to the first surface electrode at the corresponding position and provide the 24 voltage signals of the same voltage value. According to the principle similar to the foregoing, it is possible to realize the effective recognition of the lines while realizing the normal display.

In summary, the liquid crystal molecules of the first liquid crystal layer 25 are any one of positive liquid crystal molecules, negative liquid crystal molecules and twisted nematic liquid crystal molecules, and the corresponding first polarized light is elliptically polarized light or second linearly polarized light. .

In the embodiment of the present disclosure, there are multiple target locations in the preset area, and the multiple target locations are distributed in a matrix or mosaic array.

For the first electrode layer 23 shown in FIG. 2, FIG. 4, and FIG. 5, the target position is the position where the opening 232 in the preset area is located, and for the first electrode layer 23 shown in FIG. It is assumed that the first linearly polarized light in the area is converted into the position where the first electrode 231 corresponding to the first polarized light is located.

As shown in Figure 4, multiple target positions are distributed in a mosaic array, that is, the target positions of odd-numbered rows are aligned along the column direction, the target positions of even-numbered rows are also aligned along the column direction, and the target positions of two adjacent rows are aligned along the column direction. The column direction is misaligned; as shown in Figure 5, multiple target positions are distributed in a matrix, that is, the target positions of any two adjacent rows are aligned along the column direction.

It is understandable that FIGS. 4 and 5 only show the distribution of target positions when the first electrode layer 23 is the first surface electrode, and for the first electrode layer 23 shown in FIGS. 2 and 3, the corresponding The distribution of target positions can also be matrix distribution or mosaic array distribution. It is understandable that FIG. 2 only shows the case where the first electrode 231 is provided with only one opening 232, and for each first electrode 231 shown in FIG. 2, multiple openings 232 may be provided. The plurality of openings 232 may be distributed in a matrix or a mosaic array.

In addition, the first electrode layer 23 shown in FIGS. 4 and 5 only includes one first surface electrode. In fact, the first electrode layer 23 may also include a plurality of mutually insulated first surface electrodes, and each first surface electrode The electrodes all have openings 232 as shown in FIG. 4 or FIG. 5.

Preferably, in FIGS. 2, 4 and 5, the aperture d1 of the opening 232 is 0.05 mm to 0.5 mm, and the separation distance d2 between two adjacent openings 232 is 0.3 mm to 15 mm.

The opening 232 on the first electrode 231 or the opening 232 on the first surface electrode can be used to form a point light source into the display panel 10 to realize the pattern recognition. In order to reduce the interference between adjacent point light sources, the opening 232 can be The aperture d1 is set at 0.05mm to 0.5mm, and the separation distance d2 between two adjacent openings 232 is set at 0.3mm to 15mm. When the separation distance d2 between two adjacent openings 232 is larger, the distance between adjacent point light sources The smaller the interference.

With respect to FIG. 2, when multiple openings 232 are provided for each first electrode 231, the aperture d1 of the opening 232 may also be set to be 0.05 mm to 0.5 mm, and the separation distance d2 between two adjacent openings 232 is 0.3 mm to 15 mm.

It should be noted that the shape of the orthographic projection of the opening 232 on the first substrate 21 is not limited to the rectangle shown in FIGS. 2, 4 and 5, and it may also be a circle. If the shape of the orthographic projection of the opening 232 on the first substrate 21 is a rectangle, the aperture d1 of the opening 232 refers to the length or width of the rectangle, and if the shape of the orthographic projection of the opening 232 on the first substrate 21 is a circle, the opening The aperture d1 of 232 refers to the diameter of the circle. In addition, the separation distance d2 between the two openings 232 refers to the linear distance between the center positions of the two openings 232.

In the embodiment of the present disclosure, when normal display is required, that is, when no pattern recognition is required, the incident light provided by the backlight module is still a surface light source, and the optical modulation structure 20 converts all incident light at all positions into the first polarization Light, so that what enters the display panel 10 is also a surface light source.

When normal display is required, for the first electrode layer 23 shown in FIG. 2, if the liquid crystal molecules of the first liquid crystal layer 25 are positive liquid crystal molecules or twisted nematic liquid crystal molecules, all the first electrodes 231 Provide a voltage signal with the same voltage value as the second electrode layer 24; for the first electrode layer 23 described in FIG. 3, if the liquid crystal molecules of the first liquid crystal layer 25 are positive liquid crystal molecules or twisted nematic liquid crystal molecules, then It is necessary to provide voltage signals of the same voltage value as the second electrode layer 24 to all the first electrodes 231. If the liquid crystal molecules of the first liquid crystal layer 25 are negative liquid crystal molecules, it is necessary to provide all the first electrodes 231 with the same voltage value as the second electrode layer 24. The voltage signals of the two electrode layers 24 with different voltage values; for the first electrode layer 23 shown in FIGS. 4 and 5, if the liquid crystal molecules of the first liquid crystal layer 25 are positive liquid crystal molecules or twisted nematic liquid crystal molecules, then It is necessary to provide a voltage signal of the same voltage value as that of the second electrode layer 24 to all the first surface electrodes.

In the embodiment of the present disclosure, as shown in FIG. 1, the display panel 10 includes an array substrate 11 and a color filter substrate 12 disposed oppositely, and a second liquid crystal layer 13 disposed between the array substrate 11 and the color filter substrate 12 is disposed on The second polarizer 14 on the side of the array substrate 11 away from the second liquid crystal layer 13 and the third polarizer 15 on the side of the color filter substrate 12 away from the second liquid crystal layer 13; wherein the pattern recognition device 111 is provided on the array substrate 11 in.

The array substrate 11 includes a third substrate 112 and a pattern recognition device 111 arranged on the side of the third substrate 112 close to the second liquid crystal layer 13. The color filter substrate 12 includes a fourth substrate 121 and a fourth substrate 121 arranged on the fourth substrate 121 close to the second liquid crystal layer. The color group unit 122 on the 13 side (not shown in FIG. 1, specifically shown in FIG. 9) and the black matrix 123. The color group unit 122 includes a red color group unit, a blue color group unit, and a green color group unit. The black matrix 123 is arranged between two adjacent color group units 122.

In addition, the pattern recognition device 111 may also be disposed on the side of the fourth substrate 121 close to the second liquid crystal layer 13 or far away from the second liquid crystal layer 13. When the pattern recognition device 111 is disposed on the side of the fourth substrate 121 close to the second liquid crystal layer 13, it is closer to the fourth substrate 121 than the black matrix 123, and the orthographic projection on the fourth substrate 121 is located on the side of the black matrix 123. Inside the orthographic projection on the fourth substrate 121. The pattern recognition device 111 may also be arranged on the side of the fourth substrate 121 away from the second liquid crystal layer 13. In this case, the orthographic projection of the pattern recognition device 111 on the fourth substrate 121 is located on the black matrix 123 on the fourth substrate 121. The interior of the orthographic projection. The two settings described in this paragraph do not occupy the space of the color film and do not affect the aperture ratio of the display module.

Wherein, the transmission axis of the first polarizer 26 is consistent with the direction of the transmission axis of the third polarizer 15; the transmission axis of the second polarizer 14 is the same as the transmission axis of the first polarizer 26 and the third polarizer 15 The direction of the transmission axis is vertical.

In the embodiment of the present disclosure, the first polarized light at the target position is elliptically polarized light or second linearly polarized light, and the second linearly polarized light is rotated 90° with respect to the first linearly polarized light, because the first linearly polarized light is the incident light provided by the backlight module The light passing through the first polarizer 26 and the transmission axis of the second polarizer 14 is perpendicular to the direction of the transmission axis of the first polarizer 26. Therefore, the second linearly polarized light can normally pass through the second polarizer 14 and enter Inside the display panel 10, the first linearly polarized light cannot pass through the second polarizer 14 and enter the display panel 10 normally. By controlling the direction of the transmission axis of the second polarizer 14 to be perpendicular to the direction of the transmission axis of the third polarizer 15, the purpose is to control the normal display of the display panel 10.

The above descriptions are directed to the optical modulation structure 20 being distributed in the area where the entire display panel 10 is located. Of course, the optical modulation structure 20 of the embodiment of the present disclosure may also be set only in a designated area of a fixed position, and the optical modulation structure 20 may not be set in other areas. Optical modulation structure 20.

As shown in FIGS. 6 and 7, A1 is the pattern recognition position of the display panel 10, and is a designated area of a fixed position. At this time, the pattern recognition device 111 is only arranged at the pattern recognition position A1, and the optical modulation structure 20 is arranged in the area corresponding to the pattern recognition position A1. In the area where the display panel 10 is located, the area corresponding to the pattern recognition position A1 is excluded In other areas outside, the first electrode layer 23 and the second electrode layer 24 are not connected to wires, and no voltage can be applied, or the first electrode layer 23 and the second electrode layer 24 are not provided. Except for the area corresponding to the pattern recognition position A1, the structure in other regions can make the light provided by the backlight module pass through and enter the display panel 10 normally, no matter when the pattern is recognized or when it is displayed normally. Since the first liquid crystal layer 25 exists in the optical modulation structure 20, it is necessary to encapsulate the first liquid crystal layer 25 with sealant at the edge of the area corresponding to the pattern recognition position A1.

8 shows a schematic plan view of a display panel according to an embodiment of the present disclosure, FIG. 9 shows a cross-sectional view along the section BB' shown in FIG. Sectional view of section C-C'.

The array substrate 11 is further provided with a first thin film transistor 113a and a second thin film transistor 113b, a gate line 16 connected to the gate of the first thin film transistor 113a, and a scan line 17 connected to the source of the first thin film transistor 113a. , The drain of the first thin film transistor 113a is connected to the pixel electrode 117. In addition, the drain of the second thin film transistor 113b is connected to the pattern recognition device 111, and the gate and source of the second thin film transistor 113b need to be connected to a signal line respectively, and in order to ensure that the pattern recognition device 111 can normally perform pattern recognition, It is necessary to provide an opening 124 at the corresponding position of the black matrix 123 to ensure that light can be normally incident to the pattern recognition device 111.

Specifically, both the first thin film transistor 113a and the second thin film transistor 113b include: an active layer 1131 formed on the third substrate 112 by a patterning process, a first insulating layer 1132 covering the active layer 1131 and the third substrate 112, The gate electrode 1133 formed on the first insulating layer 1132 by a patterning process, the second insulating layer 1134 covering the gate electrode 1133 and the first insulating layer 1132, and the source electrode 1135 and drain electrode 1135 and the drain electrode formed on the second insulating layer 1134 by a patterning process The electrode 1136, the source electrode 1135 and the drain electrode 1136 are respectively connected to the active layer 1131 through the via holes penetrating the second insulating layer 1134 and the first insulating layer 1132. In addition, the thin film transistor 113 also includes covering the source electrode 1135, the drain electrode 1136, and The third insulating layer 1137 of the second insulating layer 1134. The material of the active layer 1131 may be polysilicon, and the patterning process includes thin film deposition, photoresist coating, exposure, development, and etching.

The pattern recognition device 111 is a photoelectric sensor. The pattern recognition device 111 specifically includes a third electrode 1111, a photodiode 1112 formed on the third electrode 1111, and a fourth electrode 1113 formed on the photodiode 1112. The third electrode 1111 penetrates through the The via hole of the three insulating layer 1137 is connected to the drain electrode 1136 of the second thin film transistor 113b. Wherein, the photodiode 1112 includes a first doped layer, an intrinsic layer, and a second doped layer that are stacked. The first doped layer may be a P-type layer, the intrinsic layer may be an I-type layer, and the second doped layer It may be an N-type layer; or, the first doped layer may be an N-type layer, the intrinsic layer may be an I-type layer, and the second doped layer may be a P-type layer. The third electrode 1111 refers to the lower electrode of the photodiode 1112, and the fourth electrode 1113 refers to the upper electrode of the photodiode 1112.

In addition, the array substrate 11 further includes a flat layer 114 covering the third insulating layer 1137 and the pattern recognition device 111, a common electrode 115 formed on the flat layer 114 by a patterning process, and a fourth insulating layer covering the common electrode 115 and the flat layer 114 116, and the pixel electrode 117 formed on the fourth insulating layer 116 by using a patterning process. The pixel electrode 117 passes through the via hole penetrating the fourth insulating layer 116, the flat layer 114, and the third insulating layer 1137 and the drain of the first thin film transistor 113a. Pole 1136 is connected. Among them, the material of the flat layer 114 is resin.

Specifically, the scan line 17 and the source electrode 1135 of the first thin film transistor 113a are arranged in the same layer and are connected to each other; the common electrode 115 may be a whole surface electrode, and only the pixel electrode 117 is connected to the drain electrode 1136 of the first thin film transistor 113a. An opening is provided at the via hole. When a voltage is applied to the pixel electrode 117 through the first thin film transistor 113a, an electric field is formed between the pixel electrode 117 and the common electrode 115 not covered by the pixel electrode 117 to control the deflection of the second liquid crystal layer 13. In order to realize the screen display of the display panel 10.

It should be noted that the pattern recognition device 111 is provided at each position of the display panel 10 to realize full-screen fingerprint or palmprint recognition; in addition, between the target position in the optical modulation structure 20 and the pixels in the display panel 10 There is no specific positional relationship.

Optionally, as shown in FIG. 11, the display module further includes a to-be-detected object recognition component, and the to-be-detected object recognition component is a touch function layer 18 for realizing a touch function. The present disclosure does not limit the position and specific setting situation of the touch function layer 18, as long as the touch function can be realized.

The touch function layer 18 is arranged on the light emitting side of the display panel 10, for example, the touch function layer 18 is arranged on the side of the fourth substrate 121 away from the black matrix 123, or the third polarizer 15 is away from the fourth substrate 121 A touch function layer 18 is provided on one side of the sensor to realize the touch function. Preferably, the touch function layer 18 can identify the contact area between the object 30 to be detected and the display panel 10 to achieve precise positioning and division of the designated area 18.

In addition, the touch function can also be realized by using a common electrode layer, that is, the common electrode layer is multiplexed as a touch function layer. For example, the common electrode 115 in the common electrode layer can be arranged in a rectangular array to form an array of self-capacitive touch units. Multiplexing the common electrode layer as a touch function layer can reduce the thickness of the display module and simplify the structure.

It can be understood that when the touch function layer 18 is provided on the light-emitting side of the display panel 10 in FIG. 10 to obtain the structure shown in FIG. 11, correspondingly, the positions corresponding to FIGS. 8 and 9 are also provided with Touch function layer 18.

In the embodiments of the present disclosure, by adding an optical modulation structure on the light-incident side of the display panel, when pattern recognition is performed, only the incident light provided by the backlight module at the target position in the preset area can enter the liquid crystal The inside of the box and through the display panel are irradiated onto the object to be inspected for pattern recognition, and stray light that is not needed and easily causing noise is shielded by the optical modulation structure. Therefore, it can effectively reduce the color of the incident light provided by the backlight module. The ineffective light intensity generated when total reflection occurs on the side of the film substrate avoids the saturation of the pattern recognition device, so that the pattern recognition can be realized.

Referring to FIG. 12, a flowchart of a method for driving a display module according to an embodiment of the present disclosure is shown, which is applied to drive the above-mentioned display module, which may specifically include the following steps:

Step 1201: When performing pattern recognition, control the optical modulation structure to convert the incident light provided by the backlight module at the target position in the preset area into first polarized light, so that the first polarized light passes through the display panel and irradiates To the object to be detected located on the light-emitting side of the display panel.

In the embodiment of the present disclosure, when pattern recognition is required, the optical modulation structure 20 receives the incident light provided by the backlight module, and controls the optical modulation structure 20 to convert the incident light provided by the backlight module at the target position in the preset area It is the first polarized light, so that the first polarized light passes through the display panel 10 and is irradiated on the object to be detected 30 on the light-emitting side of the display panel 10, and the incident light at positions other than the target position in the preset area cannot enter Inside the display panel 10.

Preferably, for the structure shown in FIG. 3, when performing the pattern recognition, in order to ensure the accuracy of the pattern recognition, the light reflected at different positions of the object 30 to be detected is prevented from irradiating the same pattern recognition device 111, and the optical modulation structure 20 is controlled to When the incident light provided by the backlight module at the target position in the preset area is converted into the first polarized light, it is necessary to sequentially control the conversion of the incident light at each target position into the first polarized light based on the first electrode 231 connected to each drive transistor 27 One polarized light.

For example, for the first electrode layer 23 in the optical modulation structure 20 shown in FIG. 3, the target position may be the positions where the four first electrodes 231 in FIG. The data line 42 controls each driving transistor 27 in turn, so that the incident light at the first electrode 231 on the upper left side can be controlled to be converted into the first polarized light, and then the incident light at the first electrode 231 on the upper right side can be controlled to be converted into the first polarized light. Is the first polarized light. Then, it controls to convert the incident light at the first electrode 231 on the lower left side into the first polarized light. Finally, it controls to convert the incident light at the first electrode 231 on the lower right side into the first polarized light. , Based on the first polarized light obtained in these four times, respectively detect the texture image of the object 30 to be detected, and finally synthesize the complete texture image of the object 30 to be detected. It can be understood that the first electrodes 231 that are sequentially opened are not limited to the structure of the adjacent first electrodes 231, and the first electrodes 231 that sequentially control voltage changes can be adjusted according to actual needs.

Step 1202: Identify the texture image of the object to be detected according to the light reflected by the object to be detected.

In the embodiment of the present disclosure, after the first polarized light passes through the display panel 10 and is irradiated to the object 30 to be detected on the light-emitting side of the display panel 10, the first polarized light irradiated on the object 30 to be detected is on the side of the object 30 to be detected. The surface is reflected, and the reflected light will illuminate the pattern recognition device 111 in the display panel 10. The pattern recognition device 111 receives the light reflected from the object 30 to be detected, and recognizes the pattern of the object 30 to be detected based on the light reflected from the object 30 to be detected image.

In the embodiments of the present disclosure, by adding an optical modulation structure on the light-incident side of the display panel, when pattern recognition is performed, only the incident light provided by the backlight module at the target position in the preset area can enter the liquid crystal The inside of the box and through the display panel are irradiated onto the object to be inspected for pattern recognition, and stray light that is not needed and easily causing noise is shielded by the optical modulation structure. Therefore, it can effectively reduce the color of the incident light provided by the backlight module. The ineffective light intensity generated when total reflection occurs on the side of the film substrate avoids the saturation of the pattern recognition device, so that the pattern recognition can be realized.

The embodiment of the present disclosure also provides a display device, which includes the above-mentioned display module. The display module includes a display panel 10 and an optical modulation structure 20 arranged on the light incident side of the display panel 10.

As shown in FIG. 13, the display device further includes a backlight module 50, which is arranged on the side of the optical modulation structure 20 away from the display panel 10, that is, the optical modulation structure 20 is arranged between the backlight module 50 and the display panel 10. .

In addition, the display device further includes a cover plate 60 disposed on the side of the display panel 10 away from the optical modulation structure 20. The cover plate 60 may be a glass cover plate for protecting the display module.

Wherein, the backlight module 50 may be an edge-type backlight module as shown in FIG. 14, which includes a light bar 51 and an optical structure 52 arranged on the light-emitting surface side of the light bar 51. The optical structure 52 may include a light guide plate, a reflective Sheet, prism sheet, diffuser sheet, etc.

Of course, the backlight module 50 may be a direct-type backlight module, which does not need to be provided with a light guide plate. The direct-type backlight module may include a reflective sheet, a prism sheet, a diffusion sheet, etc., through the reflective sheet, The structure of the prism sheet, the diffusion sheet and the like can make the light provided by the backlight module 50 be a surface light source, and the position of the backlight lamp in the direct-type backlight module and the target position in the optical modulation structure 20 have no specific positional relationship.

In the embodiments of the present disclosure, by adding an optical modulation structure on the light-incident side of the display panel, when pattern recognition is performed, only the incident light provided by the backlight module at the target position in the preset area can enter the liquid crystal The inside of the box and through the display panel are irradiated onto the object to be inspected for pattern recognition, and stray light that is not needed and easily causing noise is shielded by the optical modulation structure. Therefore, it can effectively reduce the color of the incident light provided by the backlight module. The ineffective light intensity generated when total reflection occurs on the side of the film substrate avoids the saturation of the pattern recognition device, so that the pattern recognition can be realized.

For the foregoing method embodiments, for the sake of simple description, they are all expressed as a series of action combinations, but those skilled in the art should know that the present disclosure is not limited by the described sequence of actions, because according to the present disclosure, Some steps can be performed in other order or at the same time. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the involved actions and modules are not necessarily required by the present disclosure.

The device embodiments described above are merely illustrative, where the units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, they may be located in One place, or it can be distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the objectives of the solutions of the embodiments. Those of ordinary skill in the art can understand and implement without creative work.

The various component embodiments of the present disclosure may be implemented by hardware, or by software modules running on one or more processors, or by a combination of them. Those skilled in the art should understand that a microprocessor or a digital signal processor (DSP) may be used in practice to implement some or all of the functions of some or all of the components in the computing processing device according to the embodiments of the present disclosure. The present disclosure can also be implemented as a device or device program (for example, a computer program and a computer program product) for executing part or all of the methods described herein. Such a program for realizing the present disclosure may be stored on a computer-readable medium, or may have the form of one or more signals. Such a signal can be downloaded from an Internet website, or provided on a carrier signal, or provided in any other form.

For example, FIG. 15 shows a computing processing device that can implement the method according to the present disclosure. The computing processing device traditionally includes a processor 1010 and a computer program product in the form of a memory 1020 or a computer readable medium. The memory 1020 may be an electronic memory such as flash memory, EEPROM (Electrically Erasable Programmable Read Only Memory), EPROM, hard disk, or ROM. The memory 1020 has a storage space 1030 for executing program codes 1031 of any method steps in the above methods. For example, the storage space 1030 for program codes may include various program codes 1031 respectively used to implement various steps in the above method. These program codes can be read from or written into one or more computer program products. These computer program products include program code carriers such as hard disks, compact disks (CDs), memory cards or floppy disks. Such a computer program product is usually a portable or fixed storage unit as described with reference to FIG. 16. The storage unit may have storage segments, storage spaces, etc. arranged similarly to the memory 1020 in the computing processing device of FIG. 15. The program code can be compressed in a suitable form, for example. Generally, the storage unit includes computer-readable codes 1031', that is, codes that can be read by, for example, a processor such as 1010. These codes, when run by a computing processing device, cause the computing processing device to execute the method described above. The various steps.

The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referred to each other.

Finally, it should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply these entities. Or there is any such actual relationship or sequence between operations. Moreover, the terms "include", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or equipment including a series of elements not only includes those elements, but also includes those elements that are not explicitly listed Other elements of, or also include elements inherent to this process, method, commodity or equipment. If there are no more restrictions, the element defined by the sentence "including a..." does not exclude the existence of other identical elements in the process, method, commodity or equipment that includes the element.

The above provides a detailed introduction to a display module and its driving method and display device provided by the present disclosure. Specific examples are used in this article to illustrate the principles and implementations of the present disclosure. The description of the above embodiments is only for To help understand the methods and core ideas of the present disclosure; at the same time, for those of ordinary skill in the art, according to the ideas of the present disclosure, there will be changes in the specific implementation and the scope of application. In summary, the content of this specification It should not be construed as a limitation of the present disclosure.

Claims (22)

1. A display module, comprising: a display panel and an optical modulation structure arranged on the light incident side of the display panel, and the display panel includes a pattern recognition device;

   The optical modulation structure is configured to receive incident light provided by the backlight module when performing pattern recognition, and convert the incident light at the target position in the preset area into first polarized light, so that the first polarized light Polarized light passes through the display panel and irradiates the object to be detected on the light-emitting side of the display panel;

   The pattern recognition device is configured to receive the light reflected from the object to be detected, so as to recognize the pattern image of the object to be detected;

   Wherein, in the preset area, the incident light at other positions except the target position cannot enter the inside of the display panel.
2. The display module according to claim 1, wherein the optical modulation structure comprises a first substrate and a second substrate disposed opposite to each other, and a first electrode layer disposed between the first substrate and the second substrate And a second electrode layer, and a first liquid crystal layer disposed between the first electrode layer and the second electrode layer, and the first substrate is disposed on a side of the second substrate away from the display panel ；

   The optical modulation structure further includes a first polarizer disposed on a side of the first substrate away from the first electrode layer, and the first polarizer is configured to convert incident light provided by the backlight module into First linear polarized light; and

   The first liquid crystal layer is configured to, under the control of the first electrode layer and the second electrode layer, convert the first linearly polarized light at a target position in the preset area into the second One polarized light.
3. 3. The display module according to claim 2, wherein the first electrode layer includes a plurality of first electrodes distributed in an array, and the optical modulation structure further includes driving transistors that correspond to the first electrodes one to one and are connected to each other .
4. The display module according to claim 3, wherein part or all of the first electrodes in the plurality of first electrodes have openings penetrating the first electrodes, and the target position is part or all of the first electrodes. State the location of the opening.
5. The display module according to claim 3 or 4, wherein the optical modulation structure further comprises a plurality of gate lines distributed in a row direction and a plurality of data lines distributed in a column direction;

   Each of the gate lines is connected to the gate of the corresponding driving transistor, each of the data lines is connected to the source of the corresponding driving transistor, and the drain of the driving transistor is connected to the first electrode ;and

   The plurality of gate lines are connected to the gate driving chip, and the plurality of data lines are connected to the source driving chip.
6. 3. The display module of claim 2, wherein the first electrode layer is at least one first surface electrode, each of the first surface electrodes has a plurality of openings penetrating the first surface electrode, and The target position is a position where part or all of the opening is located.
7. The display module according to claim 4 or 6, wherein the aperture of the opening is 0.05 mm to 0.5 mm, and the distance between two adjacent openings is 0.3 mm to 15 mm.
8. 3. The display module of claim 2, wherein the liquid crystal molecules of the first liquid crystal layer are any one of positive liquid crystal molecules, negative liquid crystal molecules, and twisted nematic liquid crystal molecules.
9. The display module according to claim 2, wherein the display panel comprises an array substrate and a color filter substrate arranged oppositely, and a second liquid crystal layer arranged between the array substrate and the color filter substrate is arranged on A second polarizer on the side of the array substrate away from the second liquid crystal layer, and a third polarizer on the side of the color filter substrate away from the second liquid crystal layer;

   Wherein, the pattern recognition device is arranged in the array substrate.
10. 9. The display module of claim 9, wherein the direction of the transmission axis of the first polarizer is consistent with the direction of the transmission axis of the third polarizer;

    The transmission axis of the second polarizer is perpendicular to the transmission axis of the first polarizer and the direction of the transmission axis of the third polarizer.
11. 10. The display module of claim 10, wherein the first polarized light is elliptically polarized light or second linearly polarized light;

    The second linearly polarized light is rotated by 90° with respect to the first linearly polarized light.
12. The display module according to claim 1, wherein there are multiple target positions in the predetermined area, and the multiple target positions are distributed in a matrix or a mosaic array.
13. The display module according to claim 1, wherein the display module further comprises a to-be-detected object recognition component;

    The object to be detected recognition component is configured to recognize the contact area of the object to be detected and the display panel to determine the designated area where the target position is located;

    Wherein, the object recognition component to be detected is a touch function layer.
14. The display module according to claim 1, wherein the optical modulation structure is further configured to convert incident light at positions other than the target position in the preset area into a second polarized light, so The second polarized light cannot enter the inside of the display panel.
15. The display module according to claim 1, wherein the pattern recognition device is a fingerprint recognition device or a palmprint recognition device.
16. A method for driving a display module, which is applied to drive the display module according to any one of claims 1 to 15, and the driving method comprises:

    When performing the pattern recognition, the optical modulation structure is controlled to convert the incident light provided by the backlight module at the target position in the preset area into the first polarized light, so that the first polarized light passes through the display panel and irradiates the On the object to be detected on the light emitting side of the display panel; and

    According to the light reflected by the object to be detected, the grain image of the object to be detected is identified.
17. The method according to claim 16, wherein when the first electrode layer in the optical modulation structure includes a plurality of first electrodes distributed in an array, and the optical modulation structure further includes one-to-one with the first electrode In the case of corresponding and mutually connected driving transistors, the step of controlling the optical modulation structure to convert the incident light provided by the backlight module at the target position in the preset area into the first polarized light when performing the pattern recognition includes:

    When performing the pattern recognition, based on the first electrode connected to each of the driving transistors, the incident light at each target position is sequentially controlled to be converted into the first polarized light.
18. A computing processing device, which includes:

    A memory in which computer-readable codes are stored; and

    One or more processors, and when the computer-readable code is executed by the one or more processors, the computing processing device executes the driving method of the display module according to claim 16 or 17.
19. A computer program comprising computer readable code, when the computer readable code runs on a computing processing device, causes the computing processing device to execute the driving method of the display module according to claim 16 or 17.
20. A non-volatile computer readable storage medium in which the computer program according to claim 19 is stored.
21. A display device, comprising a backlight module and the display module according to any one of claims 1 to 15, the backlight module being arranged on a side of the optical modulation structure away from the display panel.
22. 22. The display device of claim 21, wherein the backlight module is an edge-type backlight module or a direct-type backlight module.

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