CN111105757A - Liquid crystal display device and backlight driving method - Google Patents
Liquid crystal display device and backlight driving method Download PDFInfo
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- CN111105757A CN111105757A CN201811259360.8A CN201811259360A CN111105757A CN 111105757 A CN111105757 A CN 111105757A CN 201811259360 A CN201811259360 A CN 201811259360A CN 111105757 A CN111105757 A CN 111105757A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
Abstract
The invention discloses a liquid crystal display device and a backlight driving method, comprising the following steps: the display module is used for displaying based on the received video data; the backlight module comprises at least two backlight sources with different light-emitting spectrums and is used for providing backlight for the display module; the analysis module is used for analyzing the video data to obtain a display color range corresponding to the current display content; and the driving module is connected to the backlight module and the analysis module and used for dynamically selecting and switching the backlight source of the corresponding light-emitting spectrum based on the range of the display color. The invention also provides a backlight driving method. The liquid crystal display module and the backlight driving method change the traditional mode of providing backlight by using a fixed spectrum backlight source and replace the mode of providing backlight by dynamically switching different spectrum backlight sources according to display contents, thereby greatly improving the color saturation of the liquid crystal display module.
Description
Technical Field
The invention relates to the field of display, in particular to a liquid crystal display device capable of realizing high color gamut and a backlight driving method thereof.
Background
Liquid crystal display is the most common flat panel display technology at present, and is widely applied to various fields such as televisions, mobile phones, vehicles, industry, medical treatment and the like. The principle is that the transmittance of polarized light is modulated according to the birefringence effect of liquid crystal molecules, so that bright and dark display is realized. Because of its non-active light emitting characteristic, the color saturation (i.e. the color gamut, which is used to measure the richness of the color representation of the display) is limited by the backlight and the color filter, and it is difficult to meet the continuously increasing requirements of people on the quality of the displayed color. Although the development of quantum dot display technology in recent years has made great progress in improving color saturation, it is still difficult to meet the latest color expression standard (such as bt.2020) and the visual requirements of human eyes themselves.
Disclosure of Invention
In view of the above-mentioned shortcomings in the prior art, the present invention provides a liquid crystal display module and a backlight driving method to solve the above-mentioned shortcomings in the prior art, which changes the traditional way of providing backlight by using a fixed spectrum backlight source, and replaces the way of providing backlight by dynamically switching different spectrum backlight sources according to the display content, thereby greatly improving the color saturation of the liquid crystal display module.
A liquid crystal display device comprising:
the display module is used for displaying based on the received video data;
the backlight module comprises at least two backlight sources with different light-emitting spectrums and is used for providing backlight for the display module;
the analysis module is used for analyzing the video data to obtain a display color range corresponding to the current display content;
and the driving module is connected to the backlight module and the analysis module and used for dynamically selecting and switching the backlight source corresponding to the light-emitting spectrum based on the range of the display color so as to control the backlight source corresponding to the light-emitting spectrum to provide backlight for the display module.
In the backlight module, the backlight sources with different light-emitting spectrums are respectively arranged at different sides of the liquid crystal display device, and the backlight sources with the same light-emitting spectrum are arranged at the same side of the liquid crystal display device.
In the backlight module, all the backlight sources with different light emission spectra are arranged on the same side of the liquid crystal display device, or all the backlight sources with different light emission spectra are integrated into a lamp strip and then arranged on one side of the liquid crystal display device.
In the backlight module, backlight sources with different light-emitting spectrums are arranged at the bottom of the liquid crystal display device, the backlight sources are divided into a plurality of areas, and the driving module controls the backlight sources in each area in a partition mode to provide backlight.
The backlight source is polychromatic light or monochromatic light, and the backlight sources with different colors correspond to different display ranges; the plurality of backlights are connected to each other in series or in parallel.
The analysis module analyzes the current display content by taking a frame or a scene or a region block of the backlight source as a unit so as to count the range of the display color corresponding to the current display content.
The invention also provides a backlight driving method of the liquid crystal display device, which comprises the following steps:
presetting backlight sources with at least two different luminous spectrums;
analyzing video data to be displayed to obtain a display color range corresponding to the current display content;
and dynamically selecting and switching the backlight source corresponding to the light-emitting spectrum based on the range of the display color so as to control the backlight source corresponding to the light-emitting spectrum to provide backlight for the display module.
Wherein, the step of presetting at least two backlight sources with different light-emitting spectrums comprises the following steps:
the backlight sources with different light-emitting spectrums are respectively arranged on different sides of the liquid crystal display device, and the backlight sources with the same light-emitting spectrum are arranged on the same side of the liquid crystal display device; or
All the backlight sources with different light emission spectra are arranged on the same side of the liquid crystal display device, or all the backlight sources with different light emission spectra are integrated into a lamp strip and then arranged on one side of the liquid crystal display device.
Wherein, the step of presetting at least two backlight sources with different light-emitting spectrums comprises the following steps: backlight sources with different light emission spectra are arranged at the bottom of the liquid crystal display device.
The step of analyzing the video data to be displayed to obtain the range of the display color corresponding to the current display content includes: and analyzing by taking the frame or the scene or the area block of the backlight source as a unit to count the range of the display color corresponding to the current display content.
Compared with the prior art, the liquid crystal display device and the backlight driving method thereof change the traditional mode of providing backlight by the backlight source with fixed spectrum, and replace the mode of providing backlight by dynamically switching the backlight sources with different spectrums according to the display content, thereby greatly improving the color saturation of the liquid crystal display device.
Drawings
Fig. 1 is a block diagram of a liquid crystal display device according to an embodiment of the present invention.
Fig. 2 is a display color range diagram of two backlights with different light emission spectra in the liquid crystal display device shown in fig. 1.
Fig. 3 is a schematic structural diagram of a backlight module in an lcd device according to an embodiment of the invention.
Fig. 4 is a schematic view of a structural principle of a backlight module in a liquid crystal display device according to another embodiment of the invention.
Fig. 5 is a schematic structural diagram of a backlight module in an lcd device according to another embodiment of the invention.
Fig. 6 is a flow chart of a backlight driving method of the liquid crystal display device shown in fig. 1.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; may be a mechanical connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified. In the present specification, the term "step" is used to mean not only an independent step but also a step that is not clearly distinguished from other steps, provided that the action intended by the step is achieved. In the present specification, the numerical range represented by "-" means a range in which the numerical values described before and after "-" are included as the minimum value and the maximum value, respectively. In the drawings, elements having similar or identical structures are denoted by the same reference numerals.
Compared with the prior art, the liquid crystal display device and the backlight driving method thereof change the traditional mode of providing backlight by a backlight source with a fixed spectrum, and replace the mode of providing backlight by dynamically switching the backlight sources with different spectrums according to display contents, so that the color saturation of the liquid crystal display device can be greatly improved.
Referring to fig. 1, fig. 1 is a block diagram of a liquid crystal display device 100 according to the present embodiment. In an embodiment of the present invention, the liquid crystal display device 100 includes: a display module 10 for displaying based on the received video data; a backlight module 30, including at least two backlights 31 (see fig. 3) with different light emission spectra, for providing backlight to the display module 10; the analysis module 50 is used for analyzing the video data to obtain a display color range corresponding to the current display content; the driving module 70 is connected to the backlight module 30 and the analyzing module 50, and is configured to dynamically select and switch the backlight source 31 with the corresponding light emission spectrum based on the display color range, so as to control the backlight source 31 with the corresponding light emission spectrum to provide backlight for the display module 10.
The liquid crystal display device 100 of the present invention changes the conventional way of providing backlight by using a backlight source with a fixed spectrum, and replaces the way of providing backlight by dynamically switching the backlight sources 31 with different spectrums according to the display content, so as to greatly improve the color saturation of the liquid crystal display device 100.
In the embodiment of the present invention, the driving module 70 is further connected to the display module 10 for driving the display module 10 to display the video data. Therefore, the driving module 70 includes a backlight driver (not shown) and a display driver (not shown) for driving the backlight module 30 and the display module 10, respectively.
Referring to fig. 2, fig. 2 is a diagram showing the display color ranges of two backlights 31 with different light emission spectra in the liquid crystal display device 100 according to the present invention. As can be seen from fig. 2, the backlights 31 with different emission spectra have different color ranges (respectively, ranges defined by the illustrated triangles), and with the two sets of backlights 31 emitting light dynamically, the maximum visual display range is the superposition of the areas of the two triangles, which is obviously larger than the display color range of the backlight 31 of any one set alone. Therefore, compared with the conventional method of providing backlight by a backlight source with a fixed spectrum, the color saturation of the liquid crystal display device 100 can be greatly improved.
It can be understood that, in the embodiment of the present invention, the backlight 31 is a polychromatic light or a monochromatic light, and the plurality of backlights 31 may be connected in series or in parallel to facilitate the driving control of the backlights 31.
In the embodiment of the present invention, the backlight module 30 is described by taking the backlight sources 31 with two different light emission spectra as an example, and one of the backlight sources 31 emits blue light, and the other backlight source 31 emits yellow light.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a backlight module in a liquid crystal display device according to an embodiment of the invention, wherein the display module 10 is not shown in the figure. In the backlight module 30, the backlights 31 with different emission spectra are respectively disposed on different sides of the liquid crystal display device 100, and the backlights 30 with the same emission spectra are disposed on the same side of the liquid crystal display device 100. That is, in the present embodiment, the blue backlight 31 is provided on the same side of the liquid crystal display device 100, and the yellow backlight 31 is provided on the other side of the liquid crystal display device. In this embodiment, the backlight sources 31 having different emission spectra (i.e., different colors) are provided on different sides of the liquid crystal display device 100, which facilitates assembly.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a backlight module in a liquid crystal display device according to another embodiment of the present invention, wherein the display module 10 is not shown in the figure. In the backlight module 30 of the present embodiment, all the backlights 31 with different light emission spectra are disposed on the same side of the liquid crystal display device 100, or all the backlights 31 with different light emission spectra are integrated into a light bar and then disposed on one side of the liquid crystal display device 100. That is, in the present embodiment, the yellow and blue backlights are provided on the same side of the liquid crystal display device 100 with an interval therebetween. In this embodiment, the backlight sources 31 with different light emission spectra are arranged at the same side of the liquid crystal display device 100 at intervals, so that the frame size of the liquid crystal display device 100 can be effectively reduced, and the design requirement of a narrow frame can be more favorably met.
Referring to fig. 5, fig. 5 is a schematic structural diagram of a backlight module in a liquid crystal display device according to another embodiment of the present invention, wherein the display module 10 is not shown in the figure. In the backlight module 30 of the present embodiment, the backlights 31 with different light emission spectra are disposed at the bottom of the liquid crystal display device 100, and the backlight 31 is divided into a plurality of regions (not shown), and the driving module 70 can control the backlight 31 in each region to emit light independently to provide backlight for the liquid crystal display device 100. That is, in the present embodiment, the yellow and blue backlights 31 are provided at intervals at the bottom of the liquid crystal display device 100, and backlight is provided to the liquid crystal display device 100 by the direct type.
In the embodiment of the present invention, the video data (or picture data, the same shall apply hereinafter) is generated by an external video source or a local host system (not shown), and the video data includes meta information such as normal display data, display color and brightness, which are transmitted to the parsing module 50 in addition to the display module 10 for displaying. The analysis module 50 analyzes the frame or the scene or the area block of the backlight source as a unit to count the range of the display color corresponding to the current display content. After the range of the color developing color corresponding to the current display content is counted by the analyzing module 50, the color developing color is sent to the driving module 70, and the driving module 70 controls the corresponding backlight source 31 to emit light according to the counting result, so that a more visually rich color display range is realized.
In the embodiment of the invention, the backlight module 30 includes a switching control module (not shown), and the switching control module is connected to the driving module 70 and is used for switching the corresponding backlight source 31 to provide backlight under the control of the driving module 70.
Referring to fig. 3 again, fig. 3 is a schematic structural principle diagram of a backlight module in a liquid crystal display device according to an embodiment of the invention. In the embodiment of the present invention, the backlight module 30 further includes a light path control element 33. The light path control element 33 includes a polarizer 335 and one or a combination of several of a reflective sheet 331, a light guide plate 332, a brightness enhancement film 333, and a light color conversion film 334. The reflective sheet 331 is disposed below the light guide plate 332 to reflect downward light back to the light guide plate 332; the light guide plate 332 is used for guiding the light emitted from the backlight source 31, so that the backlight module 30 can emit light uniformly; the brightness enhancement film 333 is used for increasing the brightness of the emergent light; the light color conversion film 334 is used for converting the incident light of a single color emitted from the backlight 31 into light of other colors (for example, light of three colors, red, green and blue) to be emitted, so as to cooperate with the display module 10 to realize a display function. The polarizer 335 includes an upper polarizer (not shown) and a lower polarizer (not shown) for controlling the polarization direction of light.
The invention also provides a backlight driving method of the liquid crystal display device.
Referring to fig. 6, fig. 6 is a flowchart illustrating a backlight driving method of the lcd device shown in fig. 1. The backlight driving method of the liquid crystal display device comprises the following steps:
s61: presetting backlight sources with at least two different luminous spectrums;
s62: analyzing video data to be displayed to obtain a display color range corresponding to the current display content;
s63: and dynamically selecting and switching the backlight source corresponding to the light-emitting spectrum based on the range of the display color so as to control the backlight source corresponding to the light-emitting spectrum to provide backlight for the display module.
In an embodiment of the present invention, the step S61 of presetting at least two backlights with different emission spectra includes:
the backlight sources with different light-emitting spectrums are respectively arranged on different sides of the liquid crystal display device, and the backlight sources with the same light-emitting spectrum are arranged on the same side of the liquid crystal display device; or
All the backlight sources with different light emission spectra are arranged on the same side of the liquid crystal display device, or all the backlight sources with different light emission spectra are integrated into a lamp strip and then arranged on one side of the liquid crystal display device.
In another embodiment of the present invention, the step S61 of presetting at least two backlights with different emission spectra includes: backlight sources with different light emission spectra are arranged at the bottom of the liquid crystal display device.
In this embodiment, the step S62 of parsing the video data to be displayed to obtain the range of the display color corresponding to the current display content includes: and analyzing by taking the frame or the scene or the area block of the backlight source as a unit to count the range of the display color corresponding to the current display content.
Compared with the prior art, the liquid crystal display device and the backlight driving method thereof change the traditional mode of providing backlight by using a backlight source with fixed spectrum, and replace the mode of providing backlight by dynamically switching the backlight sources with different spectrums according to display contents, thereby greatly improving the color saturation of the liquid crystal display device and the backlight driving method thereof.
It should be understood that the above-mentioned embodiments are merely preferred examples of the present invention, and not restrictive, but rather, all the changes, substitutions, alterations and modifications that come within the spirit and scope of the invention as described above may be made by those skilled in the art, and all the changes, substitutions, alterations and modifications that fall within the scope of the appended claims should be construed as being included in the present invention.
Claims (10)
1. A liquid crystal display device, comprising:
the display module is used for displaying based on the received video data;
the backlight module comprises at least two backlight sources with different light-emitting spectrums and is used for providing backlight for the display module;
the analysis module is used for analyzing the video data to obtain a display color range corresponding to the current display content;
and the driving module is connected to the backlight module and the analysis module and used for dynamically selecting and switching the backlight source corresponding to the light-emitting spectrum based on the range of the display color so as to control the backlight source corresponding to the light-emitting spectrum to provide backlight for the display module.
2. The liquid crystal display device according to claim 1, wherein: in the backlight module, the backlight sources with different light-emitting spectrums are respectively arranged at different sides of the liquid crystal display device, and the backlight sources with the same light-emitting spectrum are arranged at the same side of the liquid crystal display device.
3. The lcd device of claim 1, wherein all the backlight sources with different light emission spectra in the backlight module are disposed on the same side of the lcd device, or all the backlight sources with different light emission spectra are integrated into a light bar and disposed on one side of the lcd device.
4. The liquid crystal display device of claim 1, wherein the backlight module comprises backlight sources with different light emission spectra disposed at the bottom of the liquid crystal display device, and the backlight sources are divided into a plurality of regions, and the driving module controls the backlight sources in each region in a partition manner to provide backlight.
5. The liquid crystal display device according to any one of claims 1 to 4, wherein the backlight source is a polychromatic light or a monochromatic light, and backlight sources of different colors correspond to different display color ranges; the plurality of backlights are connected to each other in series or in parallel.
6. The LCD device of any one of claims 1-4, wherein the analysis module analyzes the frame or scene or backlight area block as a unit to count the range of display colors corresponding to the current display content.
7. A backlight driving method of a liquid crystal display device, comprising the steps of:
presetting backlight sources with at least two different luminous spectrums;
analyzing video data to be displayed to obtain a display color range corresponding to the current display content;
and dynamically selecting and switching the backlight source corresponding to the light-emitting spectrum based on the range of the display color so as to control the backlight source corresponding to the light-emitting spectrum to provide backlight for the display module.
8. The backlight driving method according to claim 7, wherein the step of presetting at least two backlight sources having different light emission spectra comprises:
the backlight sources with different light-emitting spectrums are respectively arranged on different sides of the liquid crystal display device, and the backlight sources with the same light-emitting spectrum are arranged on the same side of the liquid crystal display device; or
All the backlight sources with different light emission spectra are arranged on the same side of the liquid crystal display device, or all the backlight sources with different light emission spectra are integrated into a lamp strip and then arranged on one side of the liquid crystal display device.
9. The backlight driving method according to claim 7, wherein the step of presetting at least two backlight sources having different light emission spectra comprises: backlight sources with different light emission spectra are arranged at the bottom of the liquid crystal display device.
10. The backlight driving method according to claim 9, wherein the step of parsing the video data to be displayed to obtain a range of display colors corresponding to the current display content comprises: and analyzing by taking the frame or the scene or the area block of the backlight source as a unit to count the range of the display color corresponding to the current display content.
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