JPH0519715A - Matrix type display driving device - Google Patents

Abstract

PURPOSE:To prevent colors from being mixed to become turbid only by the replacement of chrominance components even if a clock, etc., is deviated by providing a dedicated storage device of one and the same color and a dedicated device for other the same color as at every row. CONSTITUTION:A storage device 122 is provided as the dedicated storage device for plural display cells of the same color included in one row of a display panel 20. Further, a switch 116 which distributes an input signal having color information to the storage device is coupled between an input terminal and the storage device and a shift register 130 which outputs a driving signal for driving plural display cells of the same color in one row substantially at the same time is preferably provided between the display panel 20 and storage device 122. In this case, one storage device is used in common to the display cells of the dame color in the one row of the display panel. Therefore, even if the driving signal is applied to the display cells while deviating from the normal order, the driving signal is applied to the display cells of the same color.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a matrix type display panel having display cells of a plurality of colors and a storage device coupled between input terminals for inputting various input signals having color information. The present invention relates to a matrix type display driving device for converting these input signals into appropriate driving signals through the storage device and supplying the driving signals to a display panel, and more particularly to color turbidity that may occur when a display cell emits light. The present invention relates to a matrix type display driving device having a configuration in which the number of pixels is reduced as much as possible.

[0002]

Prior to the description of the present invention, a typical example of a conventional matrix display device will be described.

FIG. 2 is a block diagram for explaining an outline of a conventional matrix type display device. This device uses a discharge type panel and employs a pulse memory drive system.

Each circuit constituting the driving device of this device is
As is well known, since the control unit 10 is appropriately controlled and driven by the synchronization signal or the clock signal (C1 to C10) suitable for each, the detailed description thereof will be omitted.

Various input signals are input to the input terminals 12R,
Via 12G and 12B, the processor 14 (PR, P
G, PB), respectively, from which analog-to-digital (A / D) converter 16 (16a, 16b, 1)
6c) and its output terminals 18a, 18b, 18
It is output to c as a digital signal.

Here, the input signals are red color information signals (hereinafter, simply referred to as R signals) of primary colors, green color information signals (hereinafter, simply referred to as G signals), and blue information signals (hereinafter, simply referred to as G signals).
It is simply called B signal. ) And normal TV signal. Further, it is assumed that the R and G display cells are alternately arranged in the odd rows of the display panel 20, and the G and B display cells are alternately arranged in the even rows. In this example, only a partial display area (eight columns) of the display panel 20 is shown.

In accordance with such a color arrangement, the above-mentioned digital signals are switched by the switch 16, and the first storage device (M1) 22a and the second storage device (M2) 22 are switched.
Enter in b. In the conventional example, the storage devices 22a and 22b have a role of driving the display cells in the left half and the right half of the display cell area, respectively. Generally, a screen is divided into a plurality of blocks and a dedicated storage device is arranged corresponding to each block. Therefore, the storage device 22a is replaced by the first shift register (S
R) 24a and the first column driver (XDR) 26a to connect to the display panel 20 to display the display cells in the left half area, and the storage device 22b.
Are coupled to the display panel 20 via the second shift register (SR) 24b and the second column driver (XDR) 26b to display the display cells in the right half region. Incidentally. In the figure, 28 is a normal row driver (Y
DR).

Usually, the storage devices (M1, M2) 22a, 2
2b has 2 fields (1 frame), and while one storage device 22a is writing, the other storage device 22a
b alternately operates so as to perform reading and vice versa. Therefore, the signal read from the storage device 22a is transferred to the shift register 2
The first column driver 26 for the display cells in the left half region of 4a
a is distributed to the drive circuits in each column.

By the way, when displaying a halftone by the pulse memory driving method, as is well known, a signal is read out for each subfield according to the number of bits of the halftone. For example, when the halftone has 8 bits (corresponding to 256 gradations), eight subfields are set in one field cycle (1 / 60s). (For example, Document I:
Sekiguchi, Yoshine, Kita, Kaji, "Japanese Patent Publication No. 51-32051" and Document II: Kaji, Mizushima, Murayama, Fukushima "TV Gakuinho" IPD-11-4 (197)
See 3.3.12.)).

As described above, the form of the input signal is changed by the time it is output as a drive signal from the shift register (SR). Therefore, conventionally, in order to supply a drive signal to the display panel by changing the form of this input signal,
It requires the storage devices 22a and 22b as described above.

[0011]

However, in this conventional configuration, the storage devices (M1 and M2) 22a are provided.
The array of color information contained in and 22b corresponds to the color array of the display cell, and the odd-numbered rows are RGRG.
The even-numbered lines are GBGB. Therefore, the writing to the shift registers 24a and 24b is also in this order, and therefore the writing or reading order to the storage devices 22a and 22b, or the shift register 24 is performed.
If the reading order from a and 24b is shifted by one, the drive signals are addressed to the display cells arranged in each row from the shift registers 24a and 24b at a timing different from the timing at which light should be emitted originally. Resulting in. As a result, the reproduction of the color displayed on the display panel becomes a turbid color that is completely different from the original color.

[0012] Such color turbidity is a problem that may occur regardless of whether the signal processing form is digital or analog.

An object of the present invention is to provide a matrix type display driving device in which color turbidity does not occur.

[0014]

In order to achieve this object, according to the present invention, a matrix type display panel having display cells of a plurality of colors and an input terminal to which various input signals having color information are inputted. In the matrix type display drive device, which is provided with a storage device coupled between and, and which supplies the display panel with the above various signals converted into appropriate drive signals via the storage device, It is characterized in that it is provided as a dedicated memory device for a plurality of display cells of the same color included in one row of the display panel.

According to the preferred embodiment of the present invention, a switch for distributing the input signal having the color information to the storage device is connected between the input terminal and the storage device.

In the preferred embodiment of the present invention, preferably, a drive signal for driving a plurality of display cells of the same color included in one row substantially simultaneously between the display panel and the storage device. It is preferable that the shift register for outputting is output.

[0017]

According to the structure of the present invention described above, one memory device is commonly used for a plurality of display cells of the same color included in one row of the display panel. Therefore, as many storage devices as the number of colors displayed in one row are provided. Therefore, it is equivalent to providing a dedicated storage device for each specific color in one row. Therefore, even if the writing or reading to / from the storage device is deviated from the regular order due to the clock synchronization deviation or other causes, this deviation is only a deviation between the display cells of a specific same color. Absent. Therefore, even if the drive signal is applied to the display cells in a state deviated from the regular order, the drive signals are applied to the display cells of the same color, so that color turbidity does not occur.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. It should be noted that the drawings are only schematically shown so that the present invention can be understood.

FIG. 1 is a block diagram showing a preferred embodiment of the present invention. The constituents that are essentially the same as those shown in FIG. 2 are denoted by the same reference numerals, and detailed description thereof will be omitted unless otherwise specified. Further, in this embodiment, as in the case of the conventional device shown in FIG. 2, input signals of the three primary colors (R, G, B) are input to the input terminals, and the display cells of each row on the display panel. As for the color arrangement of, for example, the odd-numbered rows are RGRG ... And the even-numbered rows are GBGB. However, in FIG. 1, only a part of the display area of the entire display panel is shown, but in this embodiment, the display area of the entire display panel is not divided into the left and right areas. 1
One display area. Clock signals for synchronizing the entire device are shown by C1, C8, and C12 to C18.

In the embodiment of the matrix type display driving device of the present invention, like the conventional device, the matrix type display panel 20 having display cells of a plurality of colors and various input signals R, G, B having color information are provided. Input terminals 12R, 12G,
12B and a first and a second storage device (M
11 and M12) 122a and 122b. In the figure, the total of these storage devices is 122.
It is indicated by. Then, various input signals are converted into appropriate drive signals via the storage devices 122a and 122b and supplied to the display panel 20.

Then, the storage devices 122a and 12a
2b is provided as a storage device that operates in common for a plurality of display cells of the same color included in one row of the display panel 20. For example, the first storage device 122
The a stores the R and G signals so as to drive the R display cells for the odd-numbered rows and drive the G display cells for the even-numbered rows. On the other hand, the second storage device 1
22b stores G and B signals so as to drive a G display cell for an odd row and a B display cell for an even row.

Therefore, the input signal having the color information is R,
The switch 116 for allocating G and B to the storage device 122 is provided with the input terminals 12R, 12G and 12B and the storage device 122.
Join between and. On the other hand, one first shift register (SR1) 130a common to the odd columns of the display cell array and one second shift register (SR2) 13 common to the even columns.
0b is connected to the storage devices 122a and 122b, respectively, and these shift registers 130a and 1b are provided.
30b is connected to the display panel 20 via one common column driver (XDR) 132. In the figure, these shift registers are collectively indicated by 130.

First, in this embodiment, two first and second switches 116a and 116b are provided as the switch 116. Then, in order to drive the display cells in the odd rows, the first switch 116a is connected to the processor 14
To the R signal output terminal of (PR) and the second switch 116.
In order to connect b to the G signal output terminal of the processor 14 (PG) and to drive the display cells in the even rows, the first switch 116a is connected to the G signal output terminal of the processor 14 (PG) and the second switch 116a. The switches 116b are connected to the B signal output terminals of the processor 14 (PB), respectively. The timing of switching of these switches 116a and 116b is performed by the clock signal C12.

The R, G, B signals sampled by the switches 116a and 116b are converted into the same as in the conventional case.
First and second A / D converters 118a and 118b
(Represented by 118 as a representative), it is converted into a digital signal while timing is provided by the clock signal C13.
In this case, the number of A / D converters is one for each switch, and thus two (indicated by 118a and 118b).
It is provided.

The digital R and G signals converted by the A / D converter 118a are sent to the first storage device (M1) 122a. The digital G and B signals converted by the A / D converter 118b are stored in the second storage device (M2) 122.
sent to b. Then, the information of these signals is stored in the storage device 122 in accordance with an appropriately determined storage method, then read at appropriate timing, and supplied to the shift register 130 of the next stage. In this embodiment, the first memory device (M1) 122a is connected to the first shift register 130a, and the second memory device (M2) 12a is connected.
2b is connected to the second shift register 130b. Therefore, the R signal in the first row of the display panel 20 is
The shift register (SR1) 130a enters from 2a and is distributed to the R display cells in the first row of the display panel 20 at the same time or in time sequence. Similarly, the G signal in the first row is distributed to the G display cells in the first row via the second memory device 122b and the second shift register 130b. Similarly to the case of the first row, the G signal of the second row is the same as that of the first memory device 122a and the first shift register 1.
After 30a, it is distributed to the G display cells in the first row, and
The B signal is distributed to the B display cells in the second row via the second storage device 122b and the second shift register 130b.

In this way, appropriate R, G, B signals corresponding to the color arrangement of these display cells are added to the display cells of all the rows of the display panel 20 to maintain proper color display. You can

The points of configuration and operation not particularly mentioned are substantially the same as those of the conventional one.

It is clear that the invention is not limited to the embodiments described above, but that many modifications and variations can be made.

For example, in the above-described embodiment, the odd-numbered rows have the first color and the second color, the even-numbered rows have the second color and the third color, and each row has the two-color arrangement. Although the display cells are provided, the display cells may be provided so that R, G, and B of the three primary colors are sequentially arranged in one row. In that case, the display cells are arranged such that the colors in the column direction between adjacent rows are different from each other. An example thereof is shown in FIGS. 3 (A) and 3 (B). The display cells are linearly arranged in each column of FIG. 3A, but each column of FIG. 3B is in a zigzag arrangement. Even with this zigzag array,
In the figure, there is no problem if the column electrode shown by the broken line is commonly provided for each display cell in one column.

Further, in the above-mentioned embodiment, an example of displaying using three colors has been described, but it is also possible to use two colors.
It is clear that more than three colors can be used.

In the arrangement example of FIG. 3, it is preferable to provide a separate storage device for each color arranged in one row. An example thereof is shown in FIG. FIG. 4 shows only parts corresponding to the switch 116, the A / D converter 118, the storage device 122 and the shift register 130 of FIG. Since only the number of each component changes, detailed description thereof will be omitted. In the figure, 116c
Is a third switch, 118c is a third A / D converter, 122
c is a third storage device (M13) and 130c is a third shift register (SR3). In this case, for example, the odd-numbered rows are shown by solid lines, and the even-numbered rows are shown by broken lines, as shown in FIG.
Switch respectively.

Further, although the two A / D converters are provided in the embodiment of FIG. 1 described above, three A / D converters may be used and the switching may be performed in the subsequent stage. However, it is preferable to use two because the circuit configuration becomes simpler.

Further, each of the storage devices 122a, 122b, 1
22c itself may be operated as in the conventional example.

Further, in the above-mentioned embodiments, the example in which the display panel is driven by the panel memory is explained, but the present invention is not limited to this, and the present invention is applied to other driving methods. Is suitable. For example, 2
The present invention can be applied to all the drive systems of the display panel regardless of the drive system such as the row simultaneous drive system or the input signal cannot be directly supplied to the display panel.

Further, in the above-mentioned embodiments, it is assumed that a digital memory is used as the storage device, but an analog memory may be used. In that case,
The A / D converter in the previous stage of the memory becomes unnecessary. Also,,
In this case, if the panel requires a digital signal, an A / D converter may be provided in the subsequent stage of the memory.

Further, the display panel is an LCD (liquid crystal color display), EL (electroluminescence).
The method may be used, and any type of structure may be used as long as it is a matrix type.

[0037]

As is apparent from the above description, according to the matrix type display driving device of the present invention, a dedicated storage device is provided for each row in a certain same color and a dedicated storage device is provided for the other same color. Since the memory device is provided, the color signals relating to the same color are exchanged between the same colors even if the clocks are shifted. Therefore, no color turbidity occurs.

[Brief description of drawings]

FIG. 1 is a block diagram schematically showing a preferred embodiment of the configuration of a matrix type display driving device of the present invention.

FIG. 2 is a block diagram of a conventional pulse memory driving type matrix display driving device.

3A and 3B are diagrams for explaining another embodiment of the present invention.

FIG. 4 is a block diagram showing an example of main components of the present invention related to the embodiment of FIG.

[Explanation of symbols]

R, G, B: Input signal 10: Control units 12a, 12b, 12c: Input terminal, 14: Processor 20: Display panel, 28: Row driver 122: Storage device, 122a: First storage device 122b: Second storage device 122c: third storage device 116: switch 116a: first switch 116b: second switch 116c: third switch 118: A / D converter 118a: first A / D converter 118b: second A / D conversion 118c: third A / D converter 130: shift register, 130a: first shift register 130b: second shift register, 130c: third shift register 132: column driver

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takashi Komatsu ▲ History ▼             1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric             Industry Co., Ltd. (72) Inventor Tetsuo Sakai             1-10-11 Kinuta, Setagaya-ku, Tokyo, Japan             Sending Association Broadcasting Technology Research Institute (72) Inventor Yoshimichi Takano             1-10-11 Kinuta, Setagaya-ku, Tokyo, Japan             Sending Association Broadcasting Technology Research Institute

Claims (3)

[Claims] 1. A matrix type display panel having display cells of a plurality of colors, and a storage device coupled between an input terminal for inputting various input signals having color information, and the storage device connected via the storage device. In a matrix type display driving device for converting various signals into appropriate driving signals and supplying them to the display panel, the storage device is provided in a plurality of display cells of the same color included in one row of the display panel. On the other hand, a matrix type display drive device, which is provided as a dedicated storage device. 2. A device according to claim 1, further comprising a switch for distributing an input signal having corresponding color information, the switch being connected between the input terminal and the storage device. 3. A drive signal for driving the plurality of display cells of the same color included in one row substantially at the same time between the display panel according to claim 1 and the storage device. A device comprising a shift register.