JPH08234161A - Color panel display device and processing method of image information - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a three-color back light type color pannel display device capable of displaying images gradationwise with high contrast. SOLUTION: Image information is converted into serial data so that the color data of each color: red(R), green(G) and blue(B) are sequentially changed in an image frame, and the image data for one image is over-written several times in a display frame cycle in the frame of each color, and then liquid crystal is intermettently driven by several times. Accordingly, in comparison with the case where liquid crystal is driven continuously, the operation speed of liquid crystal is made high speed and a large operation quantity is assured, thereby providing a high contrast image in each short color frame. Furthermore, by controlling the number of times of over-writing a gradationwise display is made possible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color panel display device, and more particularly, to a display section composed of a plurality of pixels whose light transmittance is changed by being driven in accordance with image information, and a display section in accordance with the image information. The present invention relates to a color panel display device including a backlight light source for each of R, G, and B that can be independently turned on and off.

[0002]

2. Description of the Related Art In recent years, personal computers and other O
As home appliances such as A-equipment and televisions become lighter and thinner, display devices are also required to be lighter and thinner. Therefore, C which is more popular than before
As an alternative to the RT, a lightweight and thin flat panel display such as a liquid crystal display (LCD) is being developed.

Full-colorization is one of the technical items required for these flat panel displays. For example, a TFT type color LCD realizes colorization by adopting an active matrix type. According to such a TFT method, even if pulse driving is performed on a dot-by-dot basis, a memory effect is provided by a capacitor, so that high duty driving becomes possible and an LCD with excellent contrast can be provided. However, since many TFTs of VGA specifications are required, there are problems that the cost is high and the manufacturing yield is low.

On the other hand, the STN system has realized colorization by adopting the simple matrix system, and has succeeded in providing a low-cost color LCD. However, there are problems that the frame speed is slow, color mixture is likely to occur, and the contrast is poor. Therefore, in order to realize high contrast and high-speed frame display, various driving methods such as a double matrix electrode driving method and a time division driving method have been proposed. In addition, an active addressing drive method has also been proposed in which small pulses are dispersed instead of large selection pulses and all lines are simultaneously scanned to try to realize high contrast and high frame display without lowering resolution.

By the way, most conventional color LCDs are
Regardless of whether it is the TFT method or the STN method, R (red), G
A color filter system using a color filter composed of three primary colors (green) and B (blue) is adopted. Then, for example, when R is turned on, the region of R is made transparent and G,
Color display is performed by making the region B non-transparent. However, even if it is simply considered, in the case of the color filter system, pixels corresponding to each of the R, G, and B regions are required, and therefore three times as many pixels as in the case of monochrome display must be driven. Therefore, in order to obtain a high-resolution image, very fine processing is required, the driving technology becomes complicated, and the transmittance of the color filter itself must be improved, which makes color balance adjustment difficult. There are many problems to be solved.

Therefore, recently, for example, Japanese Patent Laid-Open No. 4-3
As described in Japanese Patent No. 38996, independent light sources for R, G, and B colors are sequentially turned on, and a color signal corresponding to each pixel is added in synchronization with the turn-on period to obtain a full-color image. There has been proposed a three-color backlight type color panel display that uses light sources of R, G, and B colors capable of obtaining an image.

[0007]

By the way, in the conventional color filter system, since it is possible to process the R, G and B signals as parallel data, for example, when it is desired to display a high brightness image with the R signal. The image data can be overwritten in the R region of the pixel by utilizing the memory effect of the capacitor in the drive circuit of the LCD, regardless of the behavior of the G signal, the G signal, and the B signal, and high contrast can be easily achieved. It was possible to obtain a color image of.

However, in the three-color backlight system, the color image information is once converted into serial data in which the image information of each color of R, G, and B is sequentially switched at a predetermined time cycle, and then synchronized with the switching cycle of the serial data of each color. Then, colorization is realized by sequentially lighting the R, G, and B backlights. Therefore,
As shown in FIG. 1, even when a high-luminance image is displayed by the R signal, even if the liquid crystal of a predetermined pixel region is turned on by the R signal, it is turned off by the G signal and the B signal in the next cycle. As a result, a high amount of transmitted light cannot be obtained, and a high-contrast color image cannot be obtained.
Since such an operation performance is particularly remarkable when the colorization is realized by the STN method, its solution has been desired.

The present invention has been made in view of the above-mentioned problems encountered when attempting to realize colorization of a panel display by a three-color backlight system.
Therefore, an object of the present invention is to improve the frame response performance of each pixel by improving the driving signal of the pixel and to obtain a high-contrast color image. An object is to provide an improved color panel display device.

Another object of the present invention is to provide a new and improved color panel display device capable of developing image information at high speed and increasing the speed of information transfer to an LCD. .

[0011]

In order to solve the above-mentioned problems, the present invention provides a display unit composed of a plurality of pixels whose light transmittance is changed by being driven according to image information, and the image information. R which can be controlled on / off independently,
Provided is a display device of a new and improved three-color backlight system, which includes a backlight light source of each of G and B colors. According to a first aspect of the present invention, the display device includes means for converting color image information into serial data in which image information of R, G, and B colors is sequentially switched at a predetermined time cycle, and each time cycle. Means for converting the serial data of R, G, B colors in the drawing into drawing data of R, G, B colors for driving a plurality of pixels within a predetermined range, respectively.
Means for driving a plurality of pixels within a predetermined range by repeating a plurality of times within each time period based on the drawing data of each color of R, G, and B are provided. In that case, it is preferable to further provide a means for controlling the number of times of driving a plurality of pixels within a predetermined range in each time period according to the gradation information acquired from the image information.

According to another aspect of the present invention, the display device has means for converting color image information into serial data in which image information of R, G and B colors are sequentially switched at a predetermined time period, and each time. First data bus means for developing serial data of each color of R, G, B in a cycle into L parallel data, and L parallel data corresponding to each pixel sequentially for each of M × N pixels within a predetermined range. Data is L
Memory means for storing L drawing data composed of M × N pixel information by simultaneously writing to the respective addresses, selecting means for selecting K drawing data from the L drawing data, and memory means. From the selected K drawing data, the second data bus means for reading the M pieces of pixel information for each N times divided into N times, and M × N within a predetermined range by the read K drawing data. A driving unit that drives each pixel K times in a time period is provided. Then, in that case, the selecting means can determine the number K of times to select the drawing data according to the gradation information acquired from the image information.

According to another aspect of the present invention, the display device includes means for converting color image information into serial data in which image information of R, G, and B colors is sequentially switched at a predetermined time period, and each time. First data bus means for developing serial data of each color of R, G, B in a cycle in parallel to the required total number of gradations (L), and M × within a predetermined range
L corresponding to each pixel sequentially for each of the N pixels
Memory means for storing L drawing data composed of M × N pixel information by simultaneously writing parallel data to L addresses, and the number of gradations required for drawing data to be read from the memory means. The second data bus means for reading the drawing data of (K) for each of the M pieces of pixel information N times, and M × N pixels within a predetermined range by the read K pieces of drawing data. And a driving means for driving K times within the time period.

According to still another aspect of the present invention, when processing image information through a memory having at least three addresses in different areas, only the addresses of data areas to be developed in parallel are valid for all addresses. There is provided a method of processing image information, which is characterized by processing data designated by the remaining addresses in parallel. In this case, it is possible to configure that the data areas to be valid for all addresses are different between the write operation and the read operation.

According to the present invention, a normal composite signal of, for example, the NTSC system is separated into color data of R, G and B colors, and these color data are converted into serial data which is switched at a predetermined cycle. Here, the operation of the present invention will be described by using the R signal as a representative. First, when a predetermined range, for example, an image of 640 × 480 dots is vertically divided into two and dividedly driven from the R signal included in each cycle of serial data, R color drawing data for 640 × 240 dots is formed. Then, based on this drawing data, by repeatedly driving the pixels within the above range a plurality of times within each cycle, the liquid crystal can be largely moved, and high brightness can be obtained. It should be noted that by adjusting the number of times the pixel is driven according to the gradation information, for example, when high luminance is required, the number of driving is increased, and when low luminance is sufficient, the number of driving is reduced to obtain an image It is possible to generate a gradation difference, and a high-contrast image can be obtained.

The operation of the present invention will be described more specifically. The R signal converted into serial data as described above is the first
The data bus means develops in parallel according to the required total number of gradations (for example, L = 256). Then, the 256 data are stored in the memories each having a different gray scale address, so that 256 640 ×
R color drawing data for 240 dots is formed. Then, after the R color drawing data is once formed in the memory in this way, the data is read 240 times by 640 dots at a time according to each line address, so that one R color drawing data can be read at a time. 640 x 240 for each dot
The data is read much faster than the conventional sequential read operation that needs to read the data once. Then, according to the present invention, each R color drawing data thus read at a high speed is read a plurality of times (up to 256 times) for T / 256 hours in each color frame to drive the pixels. Therefore, even if the total driving time (T) is the same, it is possible to obtain a liquid crystal operation amount having a much wider dynamic range as compared with the conventional method in which the pixel is driven only once over the T time. Therefore, it is possible to obtain a high-contrast image as compared with the conventional method. It should be noted that the gradation difference is expressed by selecting the number of times of driving the pixel according to the number of gradations (for example, 256 times driving for all gradations and 128 times driving for 1/2 gradation). It is also possible to do so.

Further, according to the image information processing method constructed according to the present invention, the display information on each pixel managed by the line address and the data selector address is used as the display data for each gradation and the gradation address is displayed. Prepare a memory group that can be gradation-stored and stored. As a result, as schematically shown in FIG. 10, all the grayscale addresses are made valid during the write operation,
After decoding 8-bit data and expanding it into 256 data buses, for example, by specifying the line address (0 to 239) and the data selector address (0 to 639),
256 bits are written in parallel corresponding to each gradation address. On the other hand, during the read operation, all the data selector addresses are made valid, and the gray scale address (0 to 255) and the line address (0 to 239) are set.
The display data for each line can be read in parallel by specifying.

As described above, according to this method, three types of addresses in different areas are combined for each operation,
By enabling all addresses in the data area to be expanded in parallel, it becomes possible to process a large amount of data at the same time at one clock timing.
It is possible to speed up the information transfer to the CD and enhance the response of the LCD drive.

[0019]

DETAILED DESCRIPTION OF THE INVENTION Referring to the accompanying drawings,
A preferred embodiment of the present invention will be described.

1. Definition of Frame First, with reference to FIG. 1, the basic concept of the operation (hereinafter, referred to as a repetitive display method) of a color display device configured according to the present invention will be described. In the repeated display method, (1) video frame, (2)
Since three types of frame frequencies having different properties, that is, a color frame and (3) display frame, are prepared, the concept of these frames will be described.

(1) Video Frame This video frame is the largest frame unit,
For example, the frequency (time period) is about 40 to 50 Hz (20 to 25 mS). An NTSC composite signal is separated into R, G, and B color data, and then R,
The image information of each of the G and B colors is converted into serial data that is sequentially switched in the time period of the color frame described later. The video frame is the R of the serial data,
It is defined as the total time of one color frame time period for each of G and B colors. In this video frame, the R image,
Since the G image and the B image are visually combined and recognized as a color image, by setting this video frame to such an extent that a sufficient quality can be obtained as a color image, the color frame and the display described below are displayed. The time period of the frame can be determined.

(2) Color frame The color frame is a time period during which information regarding each color is switched in the serial data configured as described above.
Also, in terms of the relationship with the video frame, the color frame is
The video frame is a time period allocated to three in order to display the image information of each color of R, G, and B. For example, when it is desired to set the video frame to about 40 to 50 Hz (20 to 25 mS), the color frame is 120Hz-150H
The frequency (time period) is about z (6.6 mS to 8.3 mS). Therefore, if the color frame is long, the number of times of repeated display by the display frame described below increases, so that it is possible to widen the dynamic range of the change amount of the liquid crystal and obtain a high-contrast image. However, if the color frame is too long, it is visually recognized as flicker, which is not preferable. Therefore, in reality, the color frame needs to be set as an adjustment value for various parameters such as flicker and contrast. In the conventional three-color backlight system, since the image quality is improved by adjusting the color frame, the obtained contrast naturally has a limit, and particularly when it is applied to the STN system,
It was not possible to obtain a satisfactory color image. In this respect, in the repetitive display method according to the present invention, an image with higher contrast can be obtained by incorporating the concept of the display frame described below.

(3) Display Frame According to the present invention, the image information of each color obtained from the serial data of each color of R, G and B has a predetermined range (hereinafter referred to as a drawing range), for example, 640. When the image of x480 dots is divided into upper and lower parts, it is converted into drawing data for driving pixels of 640x240 dots. And this display frame, in the color frame,
This drawing data is used to define the time for driving the pixels in the drawing range once. Therefore, the longer the time period of this display frame, the wider the drawing range can be. However, as will be described later, the repetitive display method according to the present invention expands the accumulated amount of change in the liquid crystal by drawing a plurality of times for each display frame within the color frame range of each color, thereby providing a high contrast image. Therefore, if the time period of the display frame is short, it is possible to obtain a higher contrast by increasing the number of drawing times accordingly. Further, as will be described later, in this repetitive display method, since it is intended to provide a gradation difference by adjusting the number of times of drawing by the display frame, the time period of the display frame is shortened and the number of times of drawing is increased. As a result, the number of gradations can be increased. Therefore, in determining the time period of the display frame, it is necessary to consider various parameters such as the drawing range, contrast, and the number of gradations. For example, in the case of expressing with all 256 gradations, it is necessary to insert 256 display frames into one color frame,
For example, the color frame is 120 Hz to 150 Hz (6.
When set to 6 mS to 8.3 mS), the display frame has a frequency (time period) of about 30 KHz to 38 KHz (26 μS to 33 μS).

2. Basic Operation of Repeat Display Method Next, the operation of the display apparatus of the repeat display method constructed according to the present invention will be described with reference to FIG. The gist of the present invention is that the operation performance of the liquid crystal with respect to the drive signal shows an integral characteristic at the time of rising and a differential characteristic at the time of falling, and if the total driving time is the same, continuously over the total driving time. To increase the integrated value of the amount of liquid crystal movement performed during each drive time by dividing the total drive time and repeatedly driving the liquid crystal multiple times, rather than the amount of liquid crystal movement resulting from driving the liquid crystal. It is in.

In the conventional three-color backlight system, the operation signal is turned on for Tx time, the liquid crystal is driven during that time (t0 to t2), and then the operation signal is turned off and the liquid crystal is naturally attenuated to t0 to t3. Was getting the display on period. Therefore, the operation amount Y1 of the liquid crystal in the conventional operation signal is
It can be expressed by the following number (1).

[0026]

[Equation 1]

On the other hand, in the repetitive display method, although each driving time (Ta, Tb, ...) Is short, a portion (Y2) having a good operation response when the liquid crystal rises is repeatedly used. Even if the method and the total number of hours are the same (TX = Ta + Tb +, ..., + Tn), a larger value than the conventional liquid crystal operation amount Y1 can be obtained as the accumulated liquid crystal operation amount Y4. That is, the rising amount Y2 of the liquid crystal within each driving time in the repetitive display system is expressed by the following equation (2).

[0028]

[Equation 2]

The fall amount Y3 of the liquid crystal within each drive time in the repetitive display system is expressed by the following equation (3).

[0030]

(Equation 3)

Therefore, the total time (TX = Ta + Tb +,
..., + Tn), the accumulated amount Y4 of the liquid crystal operation is
It is represented by the following number (4). From the above results, Y4> Y
Therefore, according to the repetitive display method of the present invention, it is possible to obtain a much larger amount of liquid crystal motion than that of the conventional method for the same on-time. That is,
Referring to FIG. 1, the time period of the display frame is set as Tx, which is the total of the driving times (Ta, Tb, ... + Tn), and the display is repeated a plurality of times within the time period of each color frame. As a result, it is possible to obtain a much higher liquid crystal operation amount in each color frame as compared with the conventional method.

[0032]

[Equation 4]

3. According to the present invention, it is possible to express the display gradation by adjusting the number of drawing by the display frame in each color frame.

That is, according to the repetitive display system of the present invention, as shown in FIG. 3, it is possible to adjust the integrated operation amount of the liquid crystal by adjusting the on / off timing of the liquid crystal drive signal. For example, it is possible to perform display in all gradations in which the operation of the liquid crystal reaches the saturation point by performing drawing in all display frames. In addition, by performing drawing in the display frame half the number of times, it is possible to perform drawing in 1/2 gradation which allows the operation of the liquid crystal to reach operation efficiency 1. Furthermore, by performing drawing in half the number of display frames, it is possible to perform drawing in ¼ gradation that allows the operation of the liquid crystal to reach operation efficiency 2. Thus, according to the present invention, by adjusting the number of drawing by the display frame in each color frame,
It is possible to express display gradation.

When controlling the display gradation, it is also possible to read the same drawing information a plurality of times according to the gradation data for display. However, as described later, the drawing information managed by the gradation address is prepared in advance for all the gradation numbers, and the drawing information is sequentially read out according to the gradation information to perform the display, so that a faster frame can be displayed. You can get a response. Further, as will be described later, it is possible to display a predetermined number of display frames as a set and display the gradation as a combination of the sets. For example, 256
When the drawing information is managed by the memory having the gradation addresses of 256, it is possible to set the gradation data of 256 steps and read the drawing information any number of times from the gradation data. It is also possible to configure 8-step gradation data by setting one display frame as a set and perform 8-gradation color display.

4. System Configuration One embodiment of the system configuration of a color display device according to the repeated display method according to the present invention is shown in FIGS. However, it is possible for those skilled in the art to design various system configurations within the scope of the technical idea described in the claims, and those system configurations naturally fall within the technical scope of the present invention. It goes without saying that it belongs.

In the configuration of this embodiment, the normal composite signal of the NTSC system input every 16.6 mS is RG.
The color is divided by the B selector 10 and converted into RGB serial data in which R, G, and B colors are periodically switched for each color frame, and then converted into 8-bit binary data by the A / D converter 12. Next, the display data for one screen of each color included in each color frame is transferred to the L / U selector 14
Is divided into upper screen display data and lower screen display data respectively representing upper and lower screens and sent to the data selector 16U and the data selector 16D, respectively. For example, when displaying 640 × 480 dots, screen display data of 640 × 240 bits is sent to the data selectors 16U and 16D as upper and lower drawing areas, respectively. The vertical synchronization and horizontal synchronization of the STNC signal are counted by the timing decoder 18 and used to synchronize various signals.

Now, the image data sent to the data selectors 16U and 16D is processed by the data selectors 16U and 16D according to the positions on the screen.
The number of gradations required by 0D, for example, 256 is expanded in parallel, and is expanded in the data configuration RAM groups 24U, 24D in accordance with the line address signals and gradation address signals sent from the address counters 22U, 22D. .
As a result, 640 × 240 bits of image data managed by 256 gradation addresses for each color frame of R, G, and B are stored for the image information of one video frame. The data configuration RAM group 24
Regarding the write timing to U and 24D, it is possible to implement the operation timing as shown in FIG.

This point will be described in detail with reference to FIGS. Note that FIG. 5 shows a memory configuration for one pixel, and FIG. 6 shows data configuration RAM groups 24U, 24D.
Shows the array of data and the contents of the expanded data. As shown in FIG. 5, the image data for one pixel is developed in parallel for each of R, G, and B colors from the data selector 24 by the first data bus 20 to 256 in accordance with the number of gradations, and the gradation address counters are respectively provided. It is stored in 256 storage locations managed by 22a. The position information of these pixel data on one screen is managed by the line address counter 22b. In this manner, in the data configuration RAM groups 24U and 24D, as shown in FIG. 6, for each pixel area defined by the data select area 640 and the line address 240, only 256 gradation addresses, The image information will be expanded and stored. Then, FIG. 1 schematically shows this state, and shows that each image data is stored by being overlapped as a display frame for each color frame by the gradation.

As described above, the data configuration RAM group 2
The image data stored in 4U and 24D are transferred to the line counters 28U and 2U by the second data bus means 26U and 26D.
It is possible to drive each pixel of the upper and lower liquid crystal display units 30U and 30D that are counted by the 8D and read out 240 lines, one line at a time, having a display area of 640 × 480 dots. At that time, according to the repetitive display method of the present invention, by designating the gradation address in which the image data to be read is stored, as shown in FIG. 3, according to the gradation information of each screen, The required number of image information is sequentially read. By configuring the system in this way, it is possible to expand the amount of liquid crystal operation compared to the conventional method, achieve gradation of the liquid crystal operation, and realize high-speed information transfer to the display unit. Is. Note that the read timing from the data configuration RAM groups 24U and 24D can be carried out at the operation timing as shown in FIG. Further, more specific timing of the display operation will be described later with reference to FIG.

5. Display Operation Timing of Repeated Display Method Next, an example of the display operation of the system configured as described above and capable of implementing the repeated display method according to the present invention will be described with reference to the timing chart shown in FIG. In the embodiment shown in FIG. 9, in order to simplify the description, color display is performed in a drawing area of 32 dots (4 bits × 8 clocks) × 32 dots.

For example, when controlling with a pulse signal of 100 nS as a dot clock signal, 4-bit data for 1 dot can be displayed with 1 pulse (100 nS), so that 32 lines for 1 line can be displayed. 800 nS is required to display data. In this way, it is possible to display image information for one screen by displaying 32 lines for each line.
As described above, the time period required for this operation is set as the display frame according to the present invention.
In the case of the present embodiment, 25.
6 μS is required. Further, according to the present invention, it is possible to obtain a high contrast by repeating this display frame 256 times to form a color frame of 6.55 mS and displaying the drawing repeatedly. Further, in order to express gradation, in this embodiment, 256 display frames are further set for 819.2 μS, and gradation data of 8 stages is set for every 32 sets of display frames, and the number of drawing times is set by the gradation address. It adopts a configuration that allows management. In addition,
In this embodiment, the gradation data is configured by setting a set of 32 consecutive display frames as one set.
8nth, 2 + 8nth, ... 8 + 8nth (however, n
It goes without saying that it is also possible to configure the gradation data by setting one set of display frames for each = 0, 1, ..., 31). In this way, the color frames of R, G, and B colors are formed by the display frames for 256 times.
An image frame of 19.66 mS is formed by displaying the color frames of G and B once, respectively, and as a result, a color image having a desired contrast and a high contrast is displayed with a high response. Of.

Although the present invention has been described with reference to the liquid crystal display (LCD) as an example in the above embodiments, the present invention is not limited to such embodiments. INDUSTRIAL APPLICABILITY The present invention can be applied to all three-color backlight type panel displays, for example, a magnetic fluid display according to the applicant of the present application (Japanese Patent Application No. 5-191787).
Japanese Patent Application No. 5-270063, Japanese Patent Application No. 6-15681
It can be suitably applied to the case where color display is performed by a panel display such as No. 6). In addition, the method of the present invention is
It is particularly suitable for N-type LCDs,
The present invention is not limited to the STN system, but can be applied to LCDs of various systems such as a TFT system, an ECB system, a ferroelectric system, and a field sequential system.

[0044]

Since the present invention is constructed as described above, it is possible to obtain the following excellent effects.

(1) Acceleration of operating speed of liquid crystal by repeated display method According to the present invention, image data for one screen is overwritten a plurality of times in each color frame, and the liquid crystal is intermittently divided into a plurality of times. Since it is driven, compared with the case where the liquid crystal is continuously driven, the operation speed of the liquid crystal is increased, a large operation amount is secured, and as a result, a high contrast image can be obtained within each short color frame.

(2) Gradation of Liquid Crystal Operation by Controlling Display Number of Repeated Display Method According to the present invention, by adjusting the number of times image data for one screen is overwritten in each color frame, each short color frame is adjusted. It is possible to express the gradation difference within. That is, the gradation difference can be expressed by increasing the number of times of repeated display when high brightness is desired and by decreasing the number of times of repeated display when lower brightness is sufficient.

(3) Acceleration of information transfer to LCD According to one embodiment of the system configuration of the present invention, display information regarding each pixel managed by a line address and a data selector address is used as display data for each gradation. A memory group that can store gradations by gradation addresses is prepared. Therefore, as schematically shown in FIG. 10, at the time of a write operation, all the grayscale addresses are made valid, 8-bit data is decoded, and, for example, 25
After deploying on 6 data buses, line dress (0
239) and the data selector address (0 to 639), 256 bits are written in parallel corresponding to each gradation address. On the other hand, during the read operation, all the data selector addresses are made valid, and the gray scale address (0 to 255) and the line address (0
.About.239), the display data for each line is read in parallel.

As described above, according to the present invention, three types of addresses having different areas are combined for each operation, and all the addresses of the data area to be developed in parallel are made effective. It becomes possible to process a large amount of data, speed up the information transfer to the LCD, and improve the response of the LCD drive.

[Brief description of drawings]

FIG. 1 is an explanatory diagram illustrating a concept of a video frame, a color frame, and a display frame adopted in an embodiment of the present invention.

FIG. 2 is an explanatory diagram illustrating an operation of a liquid crystal according to an embodiment of a display device adopting a repetitive display method according to the present invention.

FIG. 3 is an explanatory diagram for explaining a display gradation expression regarding an embodiment of a display device adopting a repetitive display method according to the present invention.

FIG. 4 is a system configuration diagram showing an embodiment of a drive circuit of a display device adopting a repetitive display method according to the present invention.

5 is a system configuration diagram showing a memory configuration for one pixel applicable to the system shown in FIG.

6 is an explanatory diagram showing an array of data expanded in a memory group applicable to the system shown in FIG. 4 and a content of the data.

7 is a timing chart showing the timing of the write operation of the memory applicable to the system shown in FIG.

8 is a timing chart showing the timing of a memory read operation applicable to the system shown in FIG.

FIG. 9 is a timing chart showing a display operation of still another embodiment of the display device adopting the repeated display method according to the present invention.

FIG. 10 is an explanatory diagram showing an outline of a method of processing image information according to the present invention.

FIG. 11 is a timing chart showing the operation timing of a conventional three-color backlight type color switch.

[Explanation of symbols]

 10 RGB Selector 12 A / D Converter 14 L / U Selector 16 Data Selector 18 Timing Decoder 20 First Data Bus 22 Address Counter 24 Data Configuration RAM Group 26 Second Data Bus 28 Line Counter 30 Liquid Crystal Display Section

 ─────────────────────────────────────────────────── ─── Continuation of front page (71) Applicant 595138166 Trilite Investment Limited Kowloon, Hong Kong country, Tim shirt Lee, Canton Road 30, Silver Code Tower One Unit 907 (72) Inventor Kuniaki Miyazawa Niiza-shi, Saitama Prefecture 8-12-30-221

Claims (8)

[Claims] 1. A display unit comprising a plurality of pixels whose light transmittance is changed by being driven according to image information, and an R which can be independently turned on / off according to the image information.
In a display device including a backlight light source for each of G and B, a unit for converting color image information into serial data in which image information for each of R, G, and B colors is sequentially switched at a predetermined time cycle; R, G, and B serial data of R, G, and B for driving a plurality of pixels within a predetermined range, respectively.
Means for converting into drawing data of each color, and means for driving a plurality of pixels within the predetermined range by repeating a plurality of times in each time period based on the drawing data of each of the R, G, and B colors. A color panel display device characterized by being provided. 2. A means for controlling the number of times of driving a plurality of pixels within the predetermined range in each time period according to gradation information obtained from the image information is further provided. The color panel display device according to claim 1. 3. A display section composed of a plurality of pixels whose light transmittance is changed by being driven according to image information, and R capable of being independently turned on and off according to the image information.
In a display device including a backlight light source for each of G and B, a unit for converting color image information into serial data in which image information for each of R, G, and B colors is sequentially switched at a predetermined time cycle; First data bus means for developing serial data of R, G, and B colors in parallel into L pieces, and L pieces of parallel data corresponding to the respective pixels in sequence for each of M × N pixels within a predetermined range. Memory means for storing L drawing data composed of M × N pixel information by simultaneously writing to L addresses; selecting means for selecting K drawing data from the L drawing data; From the memory means, the selected K drawing data are
A second data bus means for reading the M pieces of pixel information in N times separately, and M * within a predetermined range by the read K drawing data.
A color panel display device comprising: a driving unit that drives N pixels K times within the time period. 4. The color panel display according to claim 3, wherein the selecting unit determines the number of times K of selecting drawing data according to gradation information acquired from the image information. 5. A display unit including a plurality of pixels whose light transmittance is changed by being driven according to image information, and R capable of being independently turned on and off according to the image information,
In a display device including a backlight light source for each of G and B, a unit for converting color image information into serial data in which image information for each of R, G, and B colors is sequentially switched at a predetermined time cycle; First data bus means for developing serial data of each color of R, G, B in parallel to the required total number of gradations (L), and for each of M × N pixels within a predetermined range, sequentially for each pixel. By writing corresponding L parallel data to L addresses at the same time, memory means for storing L drawing data composed of M × N pixel information, and drawing data to be read from the memory means are requested. The second data bus means for reading the drawing data of the number of gradations (K) for each of the M pieces of pixel information divided into N times, and the predetermined drawing data of the K pieces of drawing data. M × of 囲内
A color panel display device comprising: a driving unit that drives N pixels K times within the time period. 6. The display device according to claim 1, wherein the display device is an STN type liquid crystal display device.
6. The color panel display device according to any one of 3, 4, and 5. 7. When processing image information through a memory having at least three addresses in different areas, all the addresses of the data areas to be developed in parallel are made valid, and the data designated by the remaining addresses are parallelized. A method of processing image information, characterized in that 8. A write operation and a read operation
The image information processing method according to claim 7, wherein the data areas to be validated for all addresses are different.