JPH0685107B2 - Driving system for color matrix panel display device - Google Patents

Description

The present invention relates to a color matrix panel display device using a liquid crystal (LCD) element or a light emitting diode (LED) element.

(B) Conventional technology Recently, a portable type liquid crystal television using an LCD matrix panel has been actively developed. For example, a magazine “Nikkei Electronics No.351” (September 1984).
Details are introduced on pages 211 to 240, etc. (issued on October 10).

By the way, in a color LCD panel used in such a liquid crystal television, an R which faces the signal electrode with the liquid crystal sandwiched therebetween.
(Red), G (green), and B (blue) color filters are repeatedly arranged in a line in the horizontal line direction.
One set of G and B constitutes a color unit display element corresponding to one pixel. Therefore, in order to display a color image using this LCD panel, the R, G, B primary color signals are set to 1
It is necessary to sample each pixel and apply it to each unit display element.

Therefore, in the LCD TV introduced in the previous magazine,
The R, G, and B signals of each line are sampled for one pixel at the same timing, and the sampled R, G, and
B Each signal is latched in each of the three sets of signal electrode driver circuits provided exclusively for each, and the three sets of signal electrode driver circuits are alternately driven, so that after sampling corresponding to each pixel. The R, G, and B signals are applied to the unit display elements of the liquid crystal panel described above.

(C) Problems to be Solved by the Invention In the above-described conventional method, since R, G, and B signals are sampled at the same timing, there is an advantage that color display with good reproducibility can be performed. However, on the other hand, since three sets of signal electrode driver circuits for the liquid crystal panel are required as described above, the circuit configuration of the driver circuit itself and the
The connection to the signal electrode of the LCD panel becomes complicated, which causes a cost increase.

Therefore, an object of the present invention is to provide a driving method that requires only one set of signal electrode driver circuits, and therefore has a simple circuit configuration and can reduce the manufacturing cost of a matrix panel display device.

(D) Means for Solving the Problems In the present invention, R, G for one line applied to each R, G, B color unit display element repeatedly arranged in the horizontal direction of the color matrix panel. , B primary color signals are sampled with a time difference according to the arrangement interval between the unit display elements, and the sampled primary color signals are sequentially applied to the corresponding unit display elements.

(E) Operation According to the above configuration, the R, G, B signals after sampling are sequentially applied to each color unit display element in the horizontal line direction of the color matrix panel by a set of signal electrode driver circuits to perform color display. Can be done.

(F) Example FIG. 1 shows an example of a color liquid crystal display device to which the drive system of the present invention is applied. This example is roughly classified as follows.
A color LCD panel (1), first and second signal electrode (Y electrode) driving units (2) and (3), a common electrode (X electrode) driving unit (4), and a color signal switching unit (5) Has been done.

As shown in FIG. 2, the LCD panel (1) has 480 Y electrodes divided into two groups, and the first Y electrode group (Y ₁ ) (Y ₃ ) ... (Y ₄₇₉ ). ), The ends extend upwards,
The second Y electrode group (Y ₂ ) (Y ₄ ) ... (Y ₄₈₀ ) has an end extending downward and 220 X electrodes (X ₁ ) (X ₂ ).
... (X ₂₂₀ ) has all its ends extending to the left. Then, a color filter for one unit element is formed in the overlapping portion of each Y electrode and each X electrode, as schematically shown by adding symbols (R), (G), and (B).

The first signal electrode driving unit (2) is provided with a first clock pulse (CP ₁ ) and a start pulse (ST ₁ ) of about 4.9 MHz generated from the Y-side pulse generating circuit (6) for the first shift. It is composed of a register (2a) and a first Y electrode driver (2b) which also has a sample hold function in which an output pulse of each digit of the shift register is given as a sampling pulse. In addition, the second signal electrode driving unit (3) has a second clock pulse (CP ₂ ) and a start pulse (S ₂ ) that are 180 ° out of phase with the first clock pulse (CP ₁ ).
It is composed of a second shift register (3a) to which T) is applied and a second Y electrode driver circuit (3b) having the same configuration as the above-mentioned first Y electrode driver circuit. The 240 output terminals of each of the first and second Y electrode driver circuits (2b) and (3b) are connected to the LCD.
Each electrode in the above-mentioned first and second Y electrode groups of the panel (1) (second
(Fig.) Is connected to the end.

The common electrode driving section (4) is provided with a shift register (4a) to which a pulse (HP) synchronized with a horizontal synchronizing pulse (HD) and an X side start pulse (ST ₂ ) output from the X side pulse generating circuit (7) are given. ). A vertical synchronizing pulse (VD) is given as a reference signal to the pulse creating circuit (7), and the pulse (HP) from the pulse creating circuit (7) is applied to the first and second Y electrode driver circuits. It is adapted to be applied as the reset pulse of (2b) and (3b).

The color signal switching unit (5) obtains the above-mentioned first clock pulse (CP ₁ ) and outputs the color three primary color signals (R) (G).
A set of gate pulses (Gr) (Gb) for each of (B)
A first gate pulse generation circuit (5a) for generating (Gg),
After obtaining the second clock pulse (CP ₂ ) described above, the above pulse (G
r) (Gb) (Gg) and a second gate pulse generation circuit (5b) for generating another set of gate pulses (Gr ') (Gg') (Gb ') whose phase is slightly shifted, According to each of the gate pulses from the second gate pulse generation circuit, the R,
A first gate circuit (5c) and a second gate circuit (5d) for sequentially selecting and deriving one of the G and B signals are provided, and the output signals of the first and second gate circuits are the above-mentioned first and second Y circuits. It is adapted to be supplied as an input to the electrode driver circuits (2b) and (3b), respectively. In the configuration of FIG. 1, the rising edge of the clock pulse is the output timing of the gate pulse generation circuit and the shift register.

In such an embodiment, the first and second clock pulses (CP ₁ ) (CP ₂ ) from the Y-side pulse generating circuit (6) are as shown in FIG. 3, and therefore the first and second shifts are performed. Register (2
a) Outputs of (3a) (Q ₁ ) (Q ₃ ) ・ ・ ・ (Q ₄₇₉ ) and (Q
₂ ) (Q ₄ ) ... (Q ₄₈₀ ) is as shown. Also,
Output pulses (Gr) (Gb) (Gg) and (Gr ') (Gg') (G from the first and second gate pulse generation circuits (5a) and (5b)
b ') is a repetitive pulse having a period 3T and a pulse width T as shown in the figure. (Gr) (Gr'), (Gg) of each pulse
Both (Gg '), (Gb) and (Gb') are out of phase by 1.5T.

Therefore, for example, the color signal of the first line output from the first gate circuit (5c) is switched in the order of R, B, G, R, B, G, ... The trailing edge (falling edge) part of each color signal is output from the first shift register (2a) (Q ₁ ) (Q ₃ ) ... (Q ₄₇₉ ) in the _first Y electrode driver circuit (2b). ) Is sequentially sampled and held at each falling timing, and each held signal is held by the first Y electrode group (Y ₁ ) (Y ₃ ) of the LCD panel (1) ...
(Y ₄₇₉ ) is applied. That is, the R sampled and held at the falling timing of the electrode (Y ₁ ) pulse (Q ₁ )
A signal is applied, and the B signal sampled and held at the pulse (Q ₃ ) falling timing is applied to the electrode (Y ₃ ), and thereafter, such an operation is repeated. The color signals output from the second gate circuit (5d) corresponding to the above-mentioned first line are G, R, and
Since it switches in the order of B, G, R, B ...
On the electrode (Y ₂ ) of the second electrode group of the panel (1), G sampled and held at the falling timing of the pulse (Q ₂ ).
A signal is applied, and the R signal sampled and held at the falling timing of the pulse (Q ₄ ) is applied to the electrode (Y ₄ ), and such an operation is repeated.

On the other hand, the output pulse from the X electrode driver circuit (4a) is applied to the electrode (X ₁ ) of the X electrode group during the period of the above-mentioned first line, and therefore, the LCD panel (1) of First line color filter (R) (G) (B)
(R), (G), (B), ... Are controlled according to the color signals corresponding to each of them, and the color display of the first line is performed. After that, such an operation is sequentially performed line by line. At this time, the setting operation of each display start end in the horizontal and vertical directions is performed in the same manner as in the prior art.

Next, FIG. 4 shows another embodiment of the present invention. In this embodiment, basically like FIG. 1, the same parts as those in FIG. The configuration is similar to the example, except for the following points. That is, in the embodiment of FIG. 4, one gate circuit (5c) and one gate pulse generation circuit (5) are provided for the first and second Y electrode driver circuits (2b) and (3b).
a) is provided in common, and the gate circuit (5c) is the gate pulse (G ₁ ) from the gate pulse generation circuit (5a).
(G ₂ ) (G ₃ ) (corresponding to Gr, Gb, Gg in FIG. 3) is obtained, and the color signals R, B, G, R, B, are output to one output line (l ₁ ).
The output is switched in the order of G, ... And is output in the order of G, R, B, G, R, B to the other output line (l ₂ ). In the configuration of FIG. 4, the rising and falling edges of the clock pulse are the output timing of the gate pulse generation circuit, and the rising edge is the output timing of the shift register.

Therefore, in this embodiment, as can be seen from the operation waveform of FIG. 5, the first R signal output from the gate circuit (5c) to the line (l ₁ ) has a rear end (falling) portion of the first Y electrode. The driver circuit (2b) is sample-held at the output pulse (Q ₁ ) falling timing of the first shift register (2a), and the sample-held R signal is displayed on the LCD panel (1) (Fig. 2). It is applied to the electrode (Y ₁ ) of the 1Y electrode group. Next, the central portion of the G signal output from the gate circuit (5c) to the line (l ₂ ) has the second Y electrode driver circuit (3
b) output pulse of the second shift register (3a) (Q
Sampled and held at the falling timing of ₂ ), and the sampled and held B signal is displayed on the LCD panel (1).
Is applied to the electrode (Y ₂ ) of the _second Y electrode group of. Similarly, it is then applied to the line (l ₁₎ trailing edge portion of the B signals to be outputted to the sample-held at the falling timing of the pulse (Q ₃₎ is a first electrode group of the electrode (Y _3), further the center portion of the R signal output to the next line (l ₂₎ is applied to a pulse (Q ₄₎ is sampled and held at the fall timing of the second electrode group of the electrode (Y _4). Therefore, even in this case, the LCD
Color filter (R) on the first line of panel (1)
(G), (B), (R), (G), (B), ... Are to be controlled according to the R, G, B signals corresponding to each of them.
Color display can be performed without any inconvenience.

Although the R, G, B repeating order for each line of the color filter of the LCD panel (1) has not been particularly described above, if the repeating order is different for each line, it is not shown in FIG. Gate pulse (Gr) (G
b) (Gg) (Gr ') (Gb') (Gg ') and (G ₁ ) (G ₂ )
The phase of (G ₃ ) may be switched line by line.

Furthermore, the present invention can be applied to a display device using the above-mentioned LED panel or the like in addition to the LCD panel.

(G) Effect of the Invention According to the present invention, it is not necessary to separately provide the Y electrode driver circuit of the matrix panel for each of the R, G, and B color signals. Connection to the panel is simplified, contributing to cost reduction of the display device. Moreover, when the matrix panel has a size of about several inches and the number of pixels in the horizontal direction is about 480 or 240, the sampling deviation between the R, G, and B unit display elements is extremely small. It can be ignored and there is no problem in practical use.

[Brief description of drawings]

FIG. 1 is a block diagram showing a main part of an embodiment of a color liquid crystal panel display device to which the present invention is applied, and FIG. 2 is a diagram schematically showing a positional relationship between X and Y electrodes and a color filter of the liquid crystal panel. , FIG. 3 is an operation waveform diagram of each part of the apparatus of FIG.
FIG. 4 is a block diagram showing a display device of another embodiment, FIG.
The figure is an operation waveform diagram of each part. (1): LCD panel, (2): first signal electrode driver,
(3): second signal electrode driving unit, (5): color signal switching unit, (2a): first shift register, (3a): second shift register, (2b): first Y electrode driver circuit, (3b) ): No.
1Y electrode driver circuit, (5a): Gate pulse generation circuit,
(5c): Gate circuit.

Claims (1)

[Claims] 1. A color matrix panel display device in which R, G, B color unit display elements are repeatedly arranged in parallel in a horizontal line direction, and parallel R, G, B primary color signals of the color matrix panel display device. Is divided into two parallel R, G, and B primary color signals, and two serial R and
G and B primary color signals are converted, and two serial R, G, and B primary color signals corresponding to 1/2 horizontal line are divided into two groups in the horizontal line direction according to the arrangement interval between the unit display elements. A method of driving a color matrix panel display device, wherein color display is performed by sampling at different time intervals and sequentially applying the sampled primary color signals to the corresponding unit display elements.