CN115019736A - Liquid crystal display and control method thereof - Google Patents

The application discloses a liquid crystal display and a control method thereof, wherein the liquid crystal display comprises a display substrate and a backlight source; the display substrate comprises a plurality of pixels arranged in rows and columns; each pixel comprises a plurality of sub-pixels corresponding to different colors; the backlight comprises a plurality of light sources of different colors; the control method of the liquid crystal display comprises the following steps: acquiring a display pixel driving signal; and alternately turning on a plurality of light sources of different colors in each row period based on the display pixel driving signals, so that a plurality of sub-pixels of different colors corresponding to each pixel are synthesized and displayed as color signals of the corresponding pixel.

Liquid crystal display and control method thereof

Technical Field

The present disclosure relates to display technologies, and particularly to a liquid crystal display and a control method thereof.

Background

A Liquid Crystal Display (LCD) is a kind of flat panel Display widely used at present. At present, the backlight transmittance of the LCD is basically between 2% and 8%, and the utilization rate of the backlight is low, so how to improve the utilization rate of the backlight is a constantly pursued goal.

Disclosure of Invention

In view of the above, the present disclosure provides a liquid crystal display and a control method thereof to solve at least the above technical problems in the prior art.

According to a first aspect of the present application, an embodiment of the present application provides a method for controlling a liquid crystal display, where the liquid crystal display includes a display substrate and a backlight source; the display substrate comprises a plurality of pixels arranged in rows and columns; each pixel comprises a plurality of sub-pixels corresponding to different colors; the backlight comprises a plurality of light sources of different colors; the control method of the liquid crystal display comprises the following steps: acquiring a display pixel driving signal; and alternately turning on a plurality of light sources of different colors in each row period based on the display pixel driving signals, so that a plurality of sub-pixels of different colors corresponding to each pixel are synthesized and displayed as color signals of the corresponding pixel.

Optionally, the plurality of differently colored light sources comprises a red light source, a green light source and a blue light source,

alternately turning on a plurality of differently colored light sources in each row period based on display pixel drive signals, comprising: and alternately turning on the red light source, the green light source and the blue light source in each row period based on the display pixel driving signals, and synchronously driving a plurality of sub-pixels of different colors corresponding to each pixel to form sub-pixels of corresponding colors.

Optionally, the backlight source includes a plurality of groups of light sources, each group of light sources includes a plurality of light sources of different colors, the display substrate includes a plurality of pixel regions, and each pixel region includes at least one pixel;

alternately turning on a plurality of differently colored light sources in each row period based on a display pixel drive signal to cause differently colored sub-pixels of each pixel to synthesize a color signal for display as the corresponding pixel, comprising: determining a target pixel area corresponding to the display pixel driving signal; determining one or more groups of target light sources corresponding to the target pixel area; alternately turning on a plurality of different color light sources of the target light source in each row period based on the display pixel drive signals.

Optionally, the backlight comprises a plurality of sets of light sources, each set comprising a plurality of differently colored light sources,

alternately turning on a plurality of differently colored light sources in each row period based on display pixel drive signals, comprising: determining a control sequence of a plurality of rows of pixels of a display substrate and one or more groups of target light sources corresponding to each row of pixels; alternately turning on a plurality of different color light sources of the corresponding target light sources in each row period based on the control sequence and the display pixel drive signals.

According to a second aspect of the present application, an embodiment of the present application provides a liquid crystal display, including: the display substrate comprises a plurality of pixels arranged in rows and columns; each pixel comprises a plurality of sub-pixels corresponding to different colors; a backlight comprising a plurality of differently colored light sources; and the plurality of light sources of different colors are alternately turned on in each row period, so that the plurality of sub-pixels of different colors corresponding to each pixel are synthesized and displayed as the color signals of the corresponding pixel.

Optionally, the plurality of differently colored light sources comprises a red light source, a green light source and a blue light source.

Optionally, the backlight comprises a plurality of groups of light sources, each group of light sources comprising a plurality of differently colored light sources.

Optionally, each row of pixels corresponds to one or more groups of light sources, or a plurality of rows of pixels corresponds to one group of light sources.

Optionally, the backlight source is a light emitting diode, a cold cathode fluorescent lamp, an external electrode fluorescent lamp, or a light emitting chip.

Optionally, a plurality of differently colored light sources are packaged in one light emitting diode.

In the liquid crystal display and the control method thereof provided by the embodiment of the application, since the backlight source provided by the embodiment of the application comprises a plurality of light sources with different colors, and the plurality of light sources with different colors are alternately turned on in each line period, the backlight thus emits light of different colors in sequence according to a time sequence, for example, red light, green light and blue light in sequence, that is, the light emitted by the backlight in each line period is itself colored light, thereby realizing color display without additionally arranging a color filter under the condition of keeping the original line driving, without the absorption of the color filter to the light emitted from the backlight source, the transmittance of the light emitted from the backlight source can be greatly improved, the brightness of the liquid crystal display can be improved, on the basis of the same optical architecture, the power consumption can be effectively reduced, and the cost of the liquid crystal display can be greatly reduced.

The foregoing description is only an overview of the technical solutions of the present application, and the present application can be implemented according to the content of the description in order to make the technical means of the present application more clearly understood, and the following detailed description of the present application is given in order to make the above and other objects, features, and advantages of the present application more clearly understandable.

Drawings

FIG. 1 is a schematic diagram of a prior art LCD;

FIG. 2 is a schematic structural diagram of an LCD according to an embodiment of the present application;

FIG. 3 is a schematic structural diagram of an LED in an embodiment of the present application;

FIG. 4 is a schematic structural diagram of a plurality of groups of light sources in a backlight according to an embodiment of the present disclosure;

FIG. 5 is a schematic view of a plurality of light sources in another backlight source according to an embodiment of the present disclosure;

FIG. 6 is a schematic diagram of a row driver in an embodiment of the present application;

FIG. 7 is a timing diagram illustrating operation of a row of pixels according to an embodiment of the present invention;

FIG. 8 is a spectrum diagram of a red light source, a green light source, and a blue light source in an embodiment of the present application;

FIG. 9 is a prior art spectrum of white light;

fig. 10 is a flowchart illustrating a method for controlling a liquid crystal display according to an embodiment of the present disclosure.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The liquid crystal display provided by the embodiment of the application, because the provided backlight source comprises a plurality of light sources with different colors, and the light sources with different colors in each line period are alternately turned on, the backlight source can sequentially emit light with different colors according to the time sequence, for example, red light, green light and blue light are sequentially emitted, that is, the light emitted by the backlight source in each line period is itself colored light, thereby under the condition of keeping the original line drive, color display is realized without additionally arranging a color filter, and the absorption of the color filter on the light emitted by the backlight source is avoided, the transmittance of the light emitted by the backlight source can be greatly improved, the brightness of the liquid crystal display is improved, the power consumption can be effectively reduced on the basis of the same optical architecture, and the cost of the liquid crystal display can also be greatly reduced.

Specifically, the light emitting diode, the cold cathode fluorescent lamp, the external electrode fluorescent lamp, or the light emitting chip includes at least a red light source, a green light source, and a blue light source. For example, a light emitting diode should include at least a red light source, such as a red LED light bar, a green light source, such as a green LED light bar, and a blue light source, such as a blue LED light bar. The led, the ccfl, the external electrode fluorescent lamp or the light emitting chip should further have a driving circuit, such as an Integrated Circuit (IC), for obtaining a display pixel driving signal and alternately turning on a plurality of light sources of different colors in each row period based on the display pixel driving signal, so that a plurality of sub-pixels of different colors corresponding to each pixel are synthesized and displayed as a color signal of the corresponding pixel.

In an alternative embodiment, since the current Light Emitting Diode (LED) can achieve a flicker frequency of 20kHz or higher, a plurality of light sources with different colors can be packaged in one LED, as shown in fig. 3, so that the volume of the backlight source can be reduced, and the cost of the liquid crystal display can be reduced.

In particular, in some embodiments, light sources of any one color of the plurality of sets of light sources may be driven simultaneously. That is, the red light sources in the entire backlight are turned on simultaneously, then the green light sources in the entire backlight are turned on simultaneously, and then the blue light sources in the entire backlight are turned on simultaneously. For example, if a group of light sources includes a red LED light bar, a green LED light bar, and a blue LED light bar, then when the driving circuit acquires the display pixel driving signal, the driving circuit drives the red LED light bars of all the groups of light sources to be turned on first, then the green LED light bars of all the groups of light sources are turned on, and then the blue LED light bars of all the groups of light sources are turned on.

Therefore, each pixel area of the liquid crystal display corresponds to one or more groups of light sources, or a plurality of pixel areas correspond to one group of light sources, so that the function of partition control of different pixel areas of the liquid crystal display is realized, the flicker frequency of each group of light sources corresponding to each area is not too large, and the light brightness of each area of the liquid crystal display can meet the requirement.

It should be noted that, if the target pixel region corresponds to multiple groups of light sources, and the multiple groups of light sources are driven simultaneously, the LED light bars of the multiple groups of light sources of various colors are alternately turned on in each row period to emit light sequentially according to the display pixel driving signal, that is, the LED light bars of the same color in the multiple groups of light sources are simultaneously turned on, and the LED light bars of different colors are sequentially turned on.

If the target pixel region corresponds to multiple groups of light sources, and each row of pixels of the target pixel region corresponds to one group of light sources, according to the display pixel driving signal, the LED light bars with different colors in the group of light sources corresponding to the row period can be alternately turned on in each row period, that is, the red LED light bar, the green LED light bar and the blue LED light bar in the group of light sources corresponding to the first row of pixels are alternately turned on in the first row period, the red LED light bar, the green LED light bar and the blue LED light bar in the other group of light sources corresponding to the first row of pixels are alternately turned on in the second row period, and other rows are sequentially similar.

When each pixel region is driven individually, the driving may be performed in a line driving manner. Each pixel region may display a frame image individually, or a plurality of pixel regions may display a frame image in combination.

In this case, when the backlight is turned on, the light sources of the respective colors in the one or more groups of light sources corresponding to the line period may be driven to emit light sequentially for each line period in accordance with the display pixel drive signal.

It should be noted that, if each row of pixels corresponds to multiple groups of light sources, the light sources of the same color in the multiple groups of light sources corresponding to each row of pixels are driven simultaneously.

For example, as shown in FIG. 5, each row of pixels corresponds to 2 sets of light sources on the backlight. Where the first row of pixels corresponds to the first and second sets of light sources and the second row of pixels corresponds to the third and fourth sets of light sources ┅. Each group of light sources comprises a red light LED lamp bar, a green light LED lamp bar and a blue light LED lamp bar. In this case, when the backlight is turned on, the red LED light bar, the green LED light bar, and the blue LED light bar in the first group of light sources and the second group of light sources corresponding to the first row of pixels may be first driven to emit light in sequence according to the display pixel driving signal. And then driving a red LED light bar, a green LED light bar and a blue LED light bar in a third group of light sources and a fourth group of light sources corresponding to the second row of pixels to emit light ┅ in sequence.

Fig. 7 shows an operation timing chart of one row of pixels in one row period. The following is a description of the operation of the first row of pixels:

So that the first row of pixels displays a smooth color picture during the first row period.

The subsequent sub-frame sequences of the colors of the pixels in each row are the same, and are not described in detail here.

The spectrum of the red light source, the green light source and the blue light source provided by the embodiment of the present application is shown in fig. 8, while the spectrum of the white light source in the prior art (for example, the blue chip converts part of the blue light into red light and green light by the fluorescent powder, and mixes them to form white light) is shown in fig. 9. As can be seen from fig. 8 and 9, with the scheme of the present application in which the backlight includes light sources of multiple colors, there is no color conversion, the wavelength of each color is shorter, and the color gamut distribution is better. Therefore, in the embodiment of the present application, when a color image is displayed, the NTSC (national Television Standards committee) color gamut can reach about 110%, and compared with the prior art in which a backlight source adopts a white light source, the NTSC color gamut is about 70%, which can achieve the effect of improving the NTSC color gamut.

The embodiment of the application also provides a control method of the liquid crystal display, wherein the liquid crystal display comprises a display substrate and a backlight source; the display substrate comprises a plurality of pixels arranged in rows and columns; each pixel comprises a plurality of sub-pixels corresponding to different colors; the backlight includes a plurality of differently colored light sources.

As shown in fig. 10, the method for controlling the liquid crystal display includes:

s801, display pixel driving signals are acquired.

S802, alternately turning on a plurality of light sources of different colors in each row period based on the display pixel driving signal, so that a plurality of sub-pixels of different colors corresponding to each pixel are synthesized and displayed as color signals of the corresponding pixel.

In the embodiment of the present application, the pixels in the display substrate are driven in a line driving manner, and the pixels in all the lines are driven to display one frame of image. The time used for driving a row of pixels is one row period. Each pixel includes at least three sub-pixels, e.g., a first sub-pixel corresponding to red, a second sub-pixel corresponding to green, and a third sub-pixel corresponding to blue. Any sub-pixel is turned on only once in a row period and transmits only one color of light. All sub-pixels in any one pixel alternate transmitting different colors of light within a line period.

In the embodiment of the present application, a plurality of sub-pixels corresponding to a plurality of different colors in a row of pixels of a display substrate are controlled, and a plurality of light sources of different colors in a backlight are sequentially turned on, so that the plurality of sub-pixels corresponding to the plurality of different colors in the row of pixels alternately transmit a plurality of lights of different colors, thereby realizing color mixing of the plurality of lights of different colors on a time axis, that is, rapidly switching a multi-color image on the time axis at a speed that is not perceivable by human eye time resolution, and displaying a row of color images by time color mixing.

In the method for controlling a liquid crystal display provided by the embodiment of the present application, since the backlight provided by the embodiment of the present application includes a plurality of light sources of different colors, and the plurality of light sources of different colors are alternately turned on in each line period, the backlight thus emits light of different colors in sequence according to a time sequence, for example, red light, green light and blue light in sequence, that is, the light emitted by the backlight in each line period is itself colored light, thereby realizing color display without additionally arranging a color filter under the condition of keeping the original line driving, without the absorption of the color filter to the light emitted from the backlight source, the transmittance of the light emitted from the backlight source can be greatly improved, the brightness of the liquid crystal display can be improved, on the basis of the same optical architecture, the power consumption can be effectively reduced, and the cost of the liquid crystal display is greatly reduced.

In an alternative embodiment, the three primary colors of light are considered to be red, green and blue, and therefore, in order to more simply realize color signals, a plurality of light sources of different colors including a red light source, a green light source and a blue light source may be provided.

Thus, alternately turning on a plurality of different colored light sources in each row period based on display pixel drive signals comprises: and alternately turning on the red light source, the green light source and the blue light source in each row period based on the display pixel driving signals, and synchronously driving a plurality of sub-pixels of different colors corresponding to each pixel to form sub-pixels of corresponding colors.

Therefore, when the red light source, the green light source and the blue light source emitted by the backlight source are subjected to color mixing on a time axis, colored light can be directly obtained. Of course, other color light sources, such as yellow light sources or white light sources, may be provided in the backlight, as desired.

In an alternative embodiment, since the size of the lcd may be large or the lcd needs to be displayed in different regions, the backlight source may be configured to include a plurality of sets of light sources, each set of light sources includes a plurality of light sources with different colors, and the display substrate includes a plurality of pixel regions, each pixel region includes at least one pixel.

Step S802 of alternately turning on a plurality of light sources of different colors in each row period based on the display pixel driving signal, so that a plurality of sub-pixels of different colors corresponding to each pixel synthesize and display color signals for the corresponding pixel, includes: determining a target pixel area corresponding to the display pixel driving signal; determining one or more groups of target light sources corresponding to the target pixel area; alternately turning on a plurality of different colored light sources of the target light source in each row period based on the display pixel drive signals.

Specifically, each pixel region may correspond to a different group of light sources in the backlight, each pixel region may correspond to all groups of light sources in the backlight, or a plurality of pixel regions may correspond to the same group or groups of light sources in the backlight.

For example, if each pixel region corresponds to all of the groups of light sources of the backlight, then each row of pixels of each pixel region corresponds to all of the groups of light sources of the backlight, and then the light sources of any one color of all of the groups of light sources of the backlight may be driven simultaneously. That is, the red light sources in the entire backlight are simultaneously lit, then the green light sources in the entire backlight are simultaneously lit, and then the blue light sources in the entire backlight are simultaneously lit. For example, a group of light sources includes a red LED light bar, a green LED light bar, and a blue LED light bar, when the driving circuit acquires the display pixel driving signal, a target pixel area, for example, a first pixel area, is determined based on the display pixel driving signal, and each row of pixels in the first pixel area corresponds to all groups of light sources of the backlight source. Then, in each row period, the red LED light bars of all the groups of light sources are driven to be turned on first, then the green LED light bars of all the groups of light sources are driven to be turned on, and then the blue LED light bars of all the groups of light sources are driven to be turned on.

For example, if each pixel region corresponds to a different group of light sources in the backlight, and one group of light sources includes a red LED light bar, a green LED light bar, and a blue LED light bar, when the driving circuit acquires the display pixel driving signal, a target pixel region, for example, a first pixel region, is determined based on the display pixel driving signal, and the first pixel region corresponds to the first group and the second group of light sources, in this case, the first group and the second group of LED light bars in the pixel region are driven to sequentially emit light based on the display pixel driving signal. The driving of the first group of light sources and the second group of light sources to emit light in sequence means that the same-color LED light bars in the first group of light sources and the second group of light sources are simultaneously lightened, and the LED light bars with different colors are lightened in sequence.

Therefore, the function of partition control of different pixel areas of the liquid crystal display can be realized, the flicker frequency of each group of light sources corresponding to each area is not too large, and the brightness of each area of the liquid crystal display can meet the requirement.

In an alternative embodiment, the backlight includes a plurality of groups of light sources, each group of light sources includes a plurality of light sources of different colors, and since the pixels in the display substrate are driven in a row driving manner, in order to make the brightness of light transmitted by each row of pixels meet requirements and reduce the flicker frequency of the group of light sources caused by only one group of light sources arranged in the backlight, each row of pixels may correspond to one or more groups of light sources, or a plurality of rows of pixels may correspond to one group of light sources.

Step S802 of alternately turning on a plurality of light sources of different colors in each row period based on the display pixel drive signals includes: determining a control sequence of a plurality of rows of pixels of a display substrate and one or more groups of target light sources corresponding to each row of pixels; alternately turning on a plurality of different color light sources of the corresponding target light sources in each row period based on the control sequence and the display pixel drive signals.

In specific implementation, if one or more groups of light sources correspond to each row of pixels, the light sources of the same color in the one or more groups of light sources corresponding to each row are driven simultaneously. For example, a set of light sources includes a red LED light bar, a green LED light bar, and a blue LED light bar. Each row of pixels corresponds to two groups of light sources. In this case, when the backlight is turned on, the LED light bars of the two groups of light sources corresponding to a row of pixels may be driven to sequentially emit light according to the display pixel driving signal corresponding to the row of pixels. The driving of the two groups of light sources corresponding to the row of pixels to emit light in sequence means that two red LED light bars in the two groups of light sources are simultaneously lit, two green LED light bars in the two groups of light sources are simultaneously lit, two blue LED light bars in the two groups of light sources are simultaneously lit, and the red LED light bars, the green LED light bars and the blue LED light bars in the two groups of light sources are sequentially lit.

Therefore, each row of pixels of the liquid crystal display corresponds to one or more groups of light sources, so that the flicker frequency of each group of light sources corresponding to each row of pixels of the liquid crystal display is not too high, and the luminance of each row of pixels of the liquid crystal display can meet the requirement.

It should be understood that various forms of the flows shown above may be used, with steps reordered, added, or deleted. For example, the steps described in the present application may be executed in parallel, sequentially, or in different orders, and the present invention is not limited thereto as long as the desired results of the technical solutions disclosed in the present application can be achieved.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.