JPS6012388Y2 - image display device - Google Patents

Description

[Detailed explanation of the invention] As shown in Fig. 1, an image signal S such as a television signal
A panel-type image display device has been conceived in which images are sequentially sampled using sampling pulses P whose phases are sequentially shifted, and images are displayed by sequentially emitting light at the intersections of row lines and column lines based on the sampled values. There is.

By the way, when displaying a color image signal such as a color television signal, one column line displays red, the next column line displays green, the next column line displays blue, and the next column line displays red. Therefore, if the number of row lines and column lines is the same, the second
As shown in the figure, the interval between adjacent sampling pulses Ps is made three times that when displaying a black and white image signal, and each pulse produces a red color signal SR and a green color signal S.

and blue color signal S8 simultaneously,
Each sampling value sequentially drives separate adjacent column lines.

However, in this case, the number of samplings in each horizontal section is 1 compared to when displaying a black and white image signal.
/3, and the resolution drops to 173.

In view of these points, the following method can be considered as a method for increasing the resolution when displaying a color image signal.

That is, as shown in FIG.
, the interval between adjacent ones is set to 173 as in the case of FIG. 2, and the red color signal SR, green color signal Sc, and blue color signal S8 are sampled at sequentially shifted times in each pulse.

In this way, the amount of color information will be tripled compared to the case of sampling as shown in Figure 2, and it will be the same as when displaying a black and white image signal with the same number of row lines and column lines. resolution is obtained.

By the way, as shown in the figure, the sampling pulse P is set such that the trailing edge of the previous pulse coincides with the leading edge of the next pulse, and at the leading edge of each pulse, for example, at the rising edge, each color signal SR, SC, and SB is One possible method is to allow the sample to be sampled.

However, at the trailing edge of each sampling pulse, that is, at the falling edge, noise N such as ringing may be superimposed on each color signal sR, Sc, and SB due to the shock applied to the circuit. If the leading edge, that is, the rising edge, coincides with the trailing edge, that is, the falling edge of the previous pulse, this portion of the noise N will be sampled, and there is a possibility that a faithful sampling value may not be obtained.

In this invention, taking this point into consideration, as shown in Figure 4,
There is a constant spacing between the trailing edge of the previous pulse and the leading edge of the next pulse.

That is, for example, sampling is performed using a sampling pulse P having a pulse width of 172 as shown in FIG.

In this way, as shown in the figure, each color signal SR, Sc
Even if noise N is superimposed on and SB, this is not sampled, and therefore a faithful sampling value can be obtained.

At the leading edge, that is, the rising edge of the sampling pulse Ps, even if it does not completely rise from 101 to rIJ, it will be a fraction of that.
Sampling is done when the signal rises to 5R1S, so when it rises completely, the noise N is added to each color signal 5R1S.
Even if it is superimposed on c and S8, it will not be sampled.

A specific example of the device of the present invention will be explained with reference to FIGS. 5 to 8.

5 and 6 show the structure of an example of a display panel, in which a cathode K is formed in parallel on one surface of a glass plate 1, and an anode A is formed on one surface of a glass plate 2 opposite thereto.
are deposited in parallel and perpendicular to the cathode, and
A so-called barrier electrode B that attracts ions or electrons by applying a constant potential between each anode A is adhered to the glass plate 2, and between this barrier electrode B and the glass plate 1, Barrier ribs 3 made of an insulator are interposed to partition the display space into individual anodes and prevent diffusion of cathode glow.

On the glass plate 2, there is a phosphor PR that emits red light between an anode A and the barrier electrodes B on both sides, and a phosphor PR that emits red light between the adjacent anode A and the barrier electrodes B on both sides. Fluorescent material P that emits green light.

However, the adjacent anode A and the barrier electrode B on both sides
A phosphor Pa that emits blue color light is successively deposited between the two.

Then, a potential is selectively applied between the anode A and the cathode to cause a discharge, which causes the phosphors PR, Pc or P
B emits red, green, or blue colored light.

Then, as shown in FIG. 7, the video detection output from the video detection circuit 4 is supplied to the video amplifier 5 to extract a luminance signal, which is supplied to the matrix circuit 6, and the output of the video detection circuit 4. is supplied to the band amplifier 7 to extract the carrier color signal, which is supplied to the color demodulation circuit 8 to obtain two demodulated color signals, which is supplied to the matrix circuit 6, and from the circuit 6, red and green are output. and blue color signals 5R1Sc and S8 are obtained and supplied to memory circuits 9R, 9G and 9B, respectively.

On the other hand, the output of the video detection circuit 4 is supplied to the synchronization separation circuit 10 to provide a vertical synchronization signal Pv and a horizontal synchronization signal PH (Fig. 8A).
and B) and input it to the start pulse forming circuit 11.
From this, a vertical start pulse Sv and a horizontal start pulse SH (FIG. 8C and D) are obtained.

Then, these start pulses SV and SH are supplied to the row line, that is, the cathode side scanning circuit 12, and pulses shifted by one horizontal period are obtained at each output terminal of the row line, that is, the cathode side scanning circuit 12.
3 to obtain the drive pulses D and c (FIG. 8E) which are shifted by one horizontal period and each have a pulse width of one horizontal period to each output terminal, and these are used as the display pulses 2 described above.
0 to the corresponding cathodes K, respectively.

On the other hand, the horizontal start pulse SH (eighth
Figure F) is supplied to the clock pulse generation circuit 14 to obtain the clock pulse Sc (Figure 8G), and the pulses SH and Sc are supplied to the original sampling pulse generation circuit 15, and each output terminal is sequentially supplied with one horizontal period. An original sampling pulse P0 (FIG. 8H) is obtained which is shifted by a predetermined time corresponding to the number of anodes A which is sufficiently shorter than , and has a pulse width corresponding to the time of the shift.

Then, this original sampling pulse P0 and the clock pulse Sc from the circuit 14 are respectively supplied to the AND gate circuit 16 corresponding to each anode A, and each has a pulse width of 172 times the pulse width of the original sampling pulse P0,
Therefore, as mentioned above, the sampling pulse Ps having a predetermined interval between the trailing edge of the previous pulse and the leading edge of the next pulse
(Fig. 8 I) is obtained.

A memory circuit 9R stores sampling pulses PS corresponding to each color.

9G and 9B, and the color signals SR, Sc and S8 are sequentially sampled as shown in FIG.

That is, the first and fourth sampling pulses P8 become part of the sampling pulse train for the color signal SR, the second and fifth ones become part of the sampling pulse train for the color signal SC, and the third and sixth ones become part of the sampling pulse train for the color signal SC. The th pulse becomes part of the sampling pulse train for the color signal SB.

Then, each sampled value is held for one horizontal period, and each output is supplied to the anode side drive circuit 17,
The output is supplied to each corresponding anode A of the display panel 20.

In this way, the color image signal can be reproduced and displayed on the display panel 20.

Note that the example in the figure is for driving with an analog signal, but
The same goes for driving with digital signals; in this case, each color signal from the matrix circuit 6 is sent to the memory circuit 9R through an analog-to-digital converter and a pulse code converter, respectively.

It is sufficient to supply it to 9G and 9B.

According to the above-described apparatus of the present invention, since the sampling position is sequentially shifted for each color signal, a good color image with high resolution can be obtained.

Moreover, since there is a certain interval between the trailing edge of the previous sampling pulse and the leading edge of the next sampling pulse, even if noise is superimposed on each color signal, it will not be sampled, and the A good image can be obtained.

[Brief explanation of the drawing]

1 to 4 are waveform diagrams for explaining the present invention, FIG. 5 is a perspective view of an example of a display panel used in the device of the present invention, FIG. 6 is a sectional view thereof, and FIG. 7 is a diagram of the present invention. FIG. 8, which is a system diagram of an example of the circuit system of the device, is a waveform diagram for explaining the system. 20 is a display panel, K is its cathode, A is its anode, P,
R, PC and PB are the phosphors, 6 is a matrix circuit, 9R, 9G and 9B are memory circuits, 10 is a synchronous separation circuit, 11 is a start pulse forming circuit, 12 is a cathode side scanning circuit, 13 is a cathode side drive circuit, 14 is a clock pulse generation circuit, 15 is an original sampling pulse generation circuit, 16
1 is an AND gate circuit, and 17 is an anode side drive circuit.

Claims (1)

[Scope of utility model registration request] A color display panel in which light emitting elements of a plurality of different colors are sequentially and periodically arranged at intersections of row lines and column lines, a video signal source that generates a plurality of primary color signals corresponding to the plurality of different colors, and the video signal. a circuit that sequentially drives the row lines in synchronization with a horizontal synchronization signal from a source, and a circuit that samples each of the plurality of primary color signals with a plurality of corresponding sampling pulse trains; A color image is displayed by sequentially causing the light-emitting elements of different colors to emit light by applying a voltage to a line, and sequentially shifting the plurality of sampling pulse trains, and applying voltage to any two adjacent sampling pulse trains of the sequentially shifted sampling pulse trains. In the pulse train, a certain interval is provided between the trailing edge of each pulse of the preceding pulse train and the leading edge of each pulse corresponding to the following pulse train in order to exclude noise superimposed on the primary color signal. image display device.