CN104299575B - Sequential color mixing display control method and device and displayer - Google Patents

Abstract

The present invention relates to the field of liquid crystal display driving, and discloses a time-sequential color mixing display control method, device, and display. By acquiring red, green, and blue color data in a frame of color image data, a backlight control signal is generated to acquire the one frame of color image data. The red, green, and blue grayscale data in the frame color image data are used to generate a liquid crystal control signal, and according to the backlight control signal and the liquid crystal control signal, the red, green, and blue sub-frames are controlled to be displayed sequentially within a preset time. to display the color image on the liquid crystal panel. Effectively improve the display resolution and light transmittance.

Description

Display control method, device and display for sequential color mixing

technical field

The invention relates to the field of liquid crystal display driving, in particular to a time-sequential color mixing display control method, device and display.

Background technique

With the development of optoelectronic semiconductor technology, liquid crystal displays have become commonly used display devices in the daily life and production of modern people. The liquid crystal display includes a liquid crystal display panel and a backlight module. Since the liquid crystal display panel itself does not have the function of emitting light, a backlight module is configured to provide the backlight required by the liquid crystal display panel, so that the liquid crystal display panel can achieve the display function.

FIG. 1 is a schematic structural diagram of a traditional liquid crystal display. The liquid crystal display includes a backlight module 110 and a liquid crystal panel 120 . The liquid crystal panel 120 includes a color filter 121 and an electrode glass 122 . The backlight provided by the backlight module 103 is a white light. The backlight is transmitted to the color filter 121 on each pixel position through the electrode glass 122 to display the color of each pixel. Generally speaking, three color filters of red R, green G, and blue B are set on a pixel position, and spatial color mixing is used to bring the three primary color lights sufficiently close to the corresponding positions on the same plane, as long as the three primary color light spots Small enough and close enough, the human eye will perceive the color of the three primary colors mixed at a certain distance.

However, the method of using color filters to display images is not only costly, but also causes the display brightness of each pixel to be dimmed due to the low light transmittance of the color filters.

Contents of the invention

The invention provides a time-series color mixing display control method, device and display, which solve the technical problems of high cost and low light transmittance caused by color filters in traditional liquid crystal displays.

The purpose of the present invention is achieved through the following technical solutions:

A display control method for sequential color mixing, comprising:

Obtain red, green, and blue color data in a frame of color image data to generate a backlight control signal;

Acquiring red, green, and blue grayscale data in the frame of color image data to generate a liquid crystal control signal;

According to the backlight control signal and the liquid crystal control signal, the red, green and blue sub-frames are controlled to be sequentially displayed within a preset time, so as to display the color image.

A display control device for sequential color mixing, the display control device comprising:

A backlight control module, configured to obtain red, green, and blue color data in a frame of color image data to generate a backlight control signal;

A liquid crystal control module, configured to obtain grayscale data of red, green, and blue in the one frame of color image data to generate a liquid crystal control signal;

a display control module, configured to control the red, green and blue sub-frames to be displayed sequentially within a preset time according to the backlight control signal of the backlight control module and the liquid crystal control signal of the liquid crystal control module, so as to display The color image.

A display, the display includes a backlight module, a liquid crystal panel and a sequential color mixing display control device, wherein,

The backlight module includes three groups of red, green and blue backlight sources;

The display control device for sequential color mixing is used to divide one frame of color image data into red, green and blue sub-frame color data to generate a backlight control signal; divide one frame of color image data into red, green and blue sub-frame gray degree data to generate a liquid crystal control signal; according to the backlight control signal and the liquid crystal control signal, control the red, green, and blue sub-frames to be displayed sequentially within a preset time, so as to display the color image.

Through the time-series color mixing display control method, device, and display provided by the present invention, the red, green, and blue color data in a frame of color image data are obtained to generate a backlight control signal, and the red, green, and green color data in the frame of color image data are obtained. , blue grayscale data to generate a liquid crystal control signal, and according to the backlight control signal and the liquid crystal control signal, control the red, green, and blue sub-frames to be displayed sequentially within a preset time, so as to be displayed on the liquid crystal panel Display the color image. Effectively improve the display resolution and light transmittance.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required in the embodiments. Obviously, the accompanying drawings in the following description are only some of the present invention. Embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without paying creative labor.

FIG. 1 is a schematic structural view of a conventional liquid crystal display;

2 is a schematic diagram of a circuit structure of a liquid crystal display provided in an embodiment of the present invention;

FIG. 3 is a flow chart of a time-series color mixing display control method provided in an embodiment of the present invention;

Fig. 4 is a display schematic diagram of a sequential color mixing provided in an embodiment of the present invention;

FIG. 5 is a schematic diagram of color mixing interference in the backlight provided in the embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a time-sequential color mixing display control device provided in an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a liquid crystal display provided in an embodiment of the present invention.

detailed description

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in FIG. 2 , it is a schematic diagram of the circuit structure of a liquid crystal display. The liquid crystal display includes a backlight module 210 and a liquid crystal panel 220. The backlight module 210 provides three groups of backlight sources of red, green and blue. The backlight module 210 can be a side-input type backlight module or direct type backlight module, and the liquid crystal panel 220 can be a high-speed TN liquid crystal screen, an OCB liquid crystal screen, a PDLC liquid crystal screen, an FLC liquid crystal screen or an AFLC liquid crystal screen. The drive control device 230 receives color image data, and controls the liquid crystal panel 120 and the backlight module 210 to display color images. The drive control device 230 includes a control signal generating circuit, a grayscale fetching circuit, and a row and column driving circuit. When a new frame of image signal starts, the control signal generating circuit, under the coordination of the system synchronous clock signal, converts the image signal from the external image source The R, G, and B parallel digital signals of a frame of color image are processed according to the display requirements, and a frame of image is divided into R, G, and B sub-frames to drive the backlight module to light up the R, G, and B backlights. , the grayscale signal in R, G, and B is sent to the row and column drive circuits by the grayscale fetching circuit, and the row and column drive circuits complete the "on" and "off" actions of the liquid crystal at each pixel according to the synchronous clock signal, Thus, the display of the color image is completed. A display control method for timing color mixing will be introduced in detail below, as follows:

An embodiment of the present invention provides a time-sequential color mixing display control method, taking the driving control device 230 as an example, as shown in FIG. 3 , the method includes the following steps:

Step 301, acquiring red, green and blue color data in a frame of color image data to generate a backlight control signal;

Among them, the R, G, and B parallel digital signals of a frame of color image from an external image source are processed according to display requirements, and the color data of red, green, and blue in a frame of color image data are obtained to generate a backlight control signal. Through step 301, a frame of image is divided into R, G, and B sub-frames, so as to control the backlight module to turn on three groups of R, G, and B backlight sources.

Step 302. Obtain grayscale data of red, green, and blue in the one frame of color image data to generate a liquid crystal control signal;

Among them, the grayscale signals in R, G, and B are obtained by the grayscale extraction circuit to generate the liquid crystal control signal, which can control the "on" and "off" actions of the liquid crystal at each pixel point, and the "on" and "off" actions of the liquid crystal. "Action means that the liquid crystal molecules rotate under the action of the electric field generated by the liquid crystal control signal to allow light to pass through. The "off" action of the liquid crystal means that the liquid crystal molecules rotate under the action of the electric field generated by the liquid crystal control signal to block the passage of light.

Step 303 , according to the backlight control signal and the liquid crystal control signal, control the red, green, and blue sub-frames to be sequentially displayed within a preset time, so as to display the color image.

Wherein, this step may include: according to the liquid crystal control signal, controlling the turn-on duration of the liquid crystal molecules corresponding to the pixels on the liquid crystal panel; , the display time of each subframe is 1/(3N) of a frame color image cycle, N is a positive integer, correspondingly, the refresh frequency of each subframe becomes 3N times of the refresh frequency of each frame color image, for example: each frame The color image refresh frequency is 60Hz. When N=1, one frame of image is divided into three subframes of R, G, and B. The refresh frequency of each subframe is 180Hz. When N=2, one frame of image is divided into R, G , B, R, G, and B six subframes, and the refresh frequency of each subframe is 360 Hz.

As shown in Figure 4, it is a display principle diagram of time-series color mixing, which intuitively illustrates that according to the backlight control signal and the liquid crystal control signal, the red, green, and blue sub-frames are controlled to be displayed sequentially within a preset time, so as to display all Describe the principle of color images. In Figure 4, a certain pixel X pixel on the LCD panel is selected as an example. The display principle of other pixels is similar to this. The red row indicates the lighting status of the red backlight, the green row indicates the lighting status of the green backlight, and the blue row indicates the lighting status of the green backlight. The lighting status of the blue backlight, ON means it is on (or the liquid crystal molecules are turned on), OFF means it is off (or the liquid crystal molecules are turned off), when the image of the Nth frame is displayed, according to the backlight control signal, the red and green backlights of the X pixel Turn on sequentially, the blue backlight is off (the same effect can also be achieved by closing the liquid crystal molecules), and the X pixel finally displays yellow. When displaying the image of the N+1th frame, according to the backlight control signal, the green and blue of the X pixel The color backlights are turned on sequentially, the red backlight is off (the same effect can also be achieved by turning off the liquid crystal molecules), and the X pixel finally displays cyan. Through the liquid crystal control signal, the turn-on time of the liquid crystal molecules corresponding to the X pixel can be controlled, and the brightness of red, green, and blue colors can be controlled respectively, and more colors can be displayed. For example: when displaying the image of the Nth frame, according to the backlight control signal , the red and green backlights of the X pixel are turned on sequentially, the blue backlight is off, and the red light-on time becomes T/2, and the green light-on time becomes T/2, and the X pixel finally displays light yellow.

In the time-series color mixing display control method provided in the embodiment of the present invention, the backlight control signal is generated by acquiring the red, green, and blue color data in a frame of color image data, and the red, green, blue, and blue color data in the one frame of color image data are acquired. blue grayscale data to generate a liquid crystal control signal, and control the red, green, and blue subframes to be displayed sequentially within a preset time according to the backlight control signal and the liquid crystal control signal, so as to be displayed on the liquid crystal panel The color image. In contrast, traditional liquid crystal displays display three red, green, and blue sub-pixels as one pixel, while the time-sequential color mixing display control method provided by the embodiment of the present invention realizes the display of each sub-pixel as a separate pixel, effectively improving The resolution of the liquid crystal display is improved. In addition, the color filter in the traditional liquid crystal device is removed, which effectively improves the light transmittance of the liquid crystal display.

In the embodiment of the present invention, since the lighting of the backlight is a gradual change process, when the red, green, and blue backlights are turned on sequentially, color mixing may occur in the rising part and falling part of the backlight signal. As shown in Figure 5, there is color mixing interference between the falling part of the red backlight signal and the rising and falling part of the green backlight, resulting in unstable image color, and severe variegated colors.

In order to solve the problem of color mixing interference, the embodiment of the present invention provides two ways:

The first way is to insert a blank area between subframes (that is, insert a black subframe). Correspondingly, step 303 may include: according to the backlight control signal and the liquid crystal control signal, control the red, green, and blue subframes in sequence Interval preset time display.

Through the first method, the red, green, and blue subframes are displayed at preset time intervals in turn, and a blank area is inserted between the subframes (that is, a black subframe is inserted), which effectively avoids the color mixing interference between the red, green, and blue subframes. Improved the purity and stability of color display.

The second method is to allow light to pass through when the backlight signal is stable. Correspondingly, step 303 may include: when the backlight signal is stable, turn on the liquid crystal molecules of the corresponding pixels on the liquid crystal panel according to the liquid crystal control signal, and control The on-time of liquid crystal molecules.

In the second method, the liquid crystal molecules of the corresponding pixels on the liquid crystal panel are turned off during the rising and falling parts of the backlight signal, and the liquid crystal molecules of the corresponding pixels on the liquid crystal panel are turned on only when the backlight signal reaches stability, which not only effectively avoids red, The color mixing interference between the green and blue sub-frames improves the purity and stability of the color display, and reduces the influence of the rising and falling stages of the backlight signal on the overall light change.

The red, green, and blue backlights in the embodiment of the present invention can also be replaced by other three-primary-color backlights besides the three primary colors of red, green, and blue, such as three primary colors of cyan, magenta, and yellow in the CMYK color gamut. As for the display control method, it is similar to the above-mentioned embodiment, and will not be repeated here.

An embodiment of the present invention provides a sequential color mixing display control device, the display control device includes:

A backlight control module 610, configured to acquire red, green, and blue color data in a frame of color image data to generate a backlight control signal;

A liquid crystal control module 620, configured to acquire grayscale data of red, green, and blue in the one frame of color image data to generate a liquid crystal control signal;

The display control module 630 is configured to control the red, green and blue sub-frames to display sequentially within a preset time according to the backlight control signal of the backlight control module 610 and the liquid crystal control signal of the liquid crystal control module 620 , to display the color image.

Wherein, the display control module 630 is specifically configured to control the red, green, and blue sub-frames to be displayed sequentially at preset time intervals according to the backlight control signal and the liquid crystal control signal.

The display control module 630 includes:

A liquid crystal drive unit, configured to control the turn-on duration of liquid crystal molecules corresponding to pixels on the liquid crystal panel according to the liquid crystal control signal;

The backlight driving unit is used to control the red, green and blue sub-frames to be displayed sequentially within a preset time according to the backlight control signal.

The liquid crystal drive unit 631 in the display control module 630 is specifically configured to turn on the liquid crystal molecules of the corresponding pixels on the liquid crystal panel according to the liquid crystal control signal when the backlight signal is stable, and control the turn-on duration of the liquid crystal molecules.

The embodiment of the present invention also provides a display, the display includes a backlight module 710, a liquid crystal panel 720 and a display control device 730 for sequential color mixing, wherein,

The backlight module 710 includes three groups of red, green and blue backlights;

The display control device 730 for sequential color mixing is used to divide one frame of color image data into red, green and blue subframe color data to generate a backlight control signal; divide one frame of color image data into red, green and blue subframes grayscale data to generate a liquid crystal control signal; according to the backlight control signal and the liquid crystal control signal, control the red, green, and blue sub-frames to be displayed sequentially within a preset time, so as to display the color image.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be realized by means of software plus a necessary hardware platform, and of course all can be implemented by hardware, but in many cases the former is better implementation. Based on this understanding, all or part of the contribution made by the technical solution of the present invention to the background technology can be embodied in the form of software products, and the computer software products can be stored in storage media, such as ROM/RAM, magnetic disks, optical disks, etc. , including several instructions to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute the methods described in various embodiments or some parts of the embodiments of the present invention.

The present invention has been described in detail above, and specific examples have been used herein to illustrate the principles and implementation modes of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; meanwhile, for the technical field Those of ordinary skill in the art will have changes in the specific implementation and scope of application according to the idea of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims (6)

1. A display control method for sequential color mixing, comprising: Obtain red, green, and blue color data in a frame of color image data to generate a backlight control signal; Acquiring red, green, and blue grayscale data in the frame of color image data to generate a liquid crystal control signal; According to the backlight control signal and the liquid crystal control signal, control the red, green, and blue sub-frames to be displayed sequentially within a preset time, so as to display the color image, which specifically includes: When the backlight signal reaches stability, according to the liquid crystal control signal, turn on the liquid crystal molecules corresponding to the pixels on the liquid crystal panel, and control the opening time of the liquid crystal molecules; Displayed sequentially within the set time. 2. The method according to claim 1, wherein, according to the backlight control signal and the liquid crystal control signal, controlling the red, green, and blue sub-frames to be sequentially displayed within a preset time respectively comprises: According to the backlight control signal and the liquid crystal control signal, the red, green and blue sub-frames are controlled to be sequentially displayed at intervals of a preset time. 3. The method according to claim 1, wherein the red, green and blue subframes can be replaced by cyan, magenta and yellow subframes. 4. A display control device for sequential color mixing, characterized in that the display control device comprises: A backlight control module, configured to obtain red, green, and blue color data in a frame of color image data to generate a backlight control signal; A liquid crystal control module, configured to obtain grayscale data of red, green, and blue in the one frame of color image data to generate a liquid crystal control signal; a display control module, configured to control the red, green and blue sub-frames to be displayed sequentially within a preset time according to the backlight control signal of the backlight control module and the liquid crystal control signal of the liquid crystal control module, so as to display The color image, wherein, The display control module includes: The liquid crystal drive unit is used to turn on the liquid crystal molecules corresponding to the pixels on the liquid crystal panel according to the liquid crystal control signal when the backlight signal is stable, and control the turn-on duration of the liquid crystal molecules; The backlight driving unit is used to control the red, green and blue sub-frames to be displayed sequentially within a preset time according to the backlight control signal. 5. The display control device according to claim 4, wherein the display control module is specifically configured to control the red, green, and blue sub-frames according to the backlight control signal and the liquid crystal control signal to preset intervals sequentially time display. 6. A display, characterized in that the display includes a backlight module, a liquid crystal panel, and a sequential color mixing display control device, wherein, The backlight module includes three groups of red, green and blue backlight sources; The display control device for sequential color mixing is used to divide one frame of color image data into red, green and blue sub-frame color data to generate a backlight control signal; divide one frame of color image data into red, green and blue sub-frame gray degree data to generate a liquid crystal control signal; according to the backlight control signal and the liquid crystal control signal, control the red, green, and blue sub-frames to be displayed sequentially within a preset time, so as to display the color on the liquid crystal panel images, which specifically include: When the backlight signal reaches stability, according to the liquid crystal control signal, turn on the liquid crystal molecules corresponding to the pixels on the liquid crystal panel, and control the opening time of the liquid crystal molecules; Displayed sequentially within the set time.