JPS60247389A - Color liquid crystal display device - Google Patents

Abstract

PURPOSE:To interpolate scanning lines dropped out by interlaced scanning to raise the resolving power of a display device by providing a memory circuit, where a digital signal obtained from an A/D converting circuit is held for a certain period, and a D/A converting circuit which converts the digital signal outputted from this memory circuit to an analog signal. CONSTITUTION:Three primay color signals converted to digital signals are stored temporarily in memory circuits 607, 608, and 609 respectively. Three primary color signals stored in memory circuits are transferred to D/A converting circuits 610, 611, and 612 at proper timings and are converted to analog signals. Three primary color signals converted to analog signals are circulated in every horizontal scanning period by a 3X3 matrix circuit 613 and are transmitted to succeeding stages. Signals having the same phases as signals obtained by inverting three primary color signals in inverting circuits 614, 615, and 616 are generated and become AC inverted signals in 2-1 multiplex circuits 617, 618, and 619 and are outputted to video signal output terminals 620, 621, and 622.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] This invention relates to a color liquid crystal display device that displays image information on a liquid crystal color active matrix panel.

[Prior art]

In recent years, television receivers using liquid crystal panels are being put into practical use. There are two types of liquid crystal panels: active matrix and baracin matrix, but the active matrix type is suitable for color television because it has much better image quality.

In the current situation, due to manufacturing circumstances, the realistic screen size is about 1.5 to 2 inches diagonally, and the screen size that is actually in practical use is 1.9 inches. .

When considering the consistency between productivity and resolution for an active matrix panel with a screen size of about 2.0 inches, I think it would be effective to scan about 200 deer in the vertical direction.

In the current N78073 broadcasting standard, there are 262.5 scanning lines per field, of which there are about 240 effective scanning lines, so 200 scanning lines in the vertical direction? For a single guest to be displayed on M active matrix panels, a method is generally adopted in which adjacent scanning lines of the first field and the second field are displayed on the same eclipse line on the active matrix panel. There is.

The advantage of this method is that the demodulated 3
) Since it is sufficient to display the JA color signal on the active matrix panel in real time, the storage circuit that holds the three primary color signals yal for a specific period and its peripheral circuits are insecure, and the hardware becomes only MI.

Figure 1 shows the configuration of the active matrix panel. The shift register (103) takes in the X data pulse from the X data pulse input terminal (102) at the beginning of the horizontal period, and controls the X data pulse by the X transfer lock applied to the X transfer lock terminal (101). Sequentially,
Transfer to next bit.

The output of this shift register (106) causes an analog switch (ii
o) y, = open/close, video input terminals (104) to (10
(5) Three primary color information signal video lines (115
).

On the other hand, the shift register (1o9) takes in the Y data pulse from the X data pulse input terminal (107) at the beginning of the vertical period, and applies it to the X transfer lock terminal (10B). , Y data pulse sequence, transfer to the next bit.

The output of this shift register (109) connects the pixel transistor (
111) g, - Introduce each horizontal line, and set the image valley amount (
112) to hold the three primary color signals supplied to the video line (113).

FIG. 2 is an example of a color arrangement of 3 JjA colors of a color acquisition matrix panel.

When using a color filter as shown in FIG. 2, each video line V, , V2 . The primary color signal supplied to V3 must be connected to the main line. Therefore, a matrix circuit as shown in FIG. 3 supplies RGB six primary color signals to the video lines V and -V3 as shown in the fourth timing diagram.

That is, on the first line, R, G, and B are placed on V, , V, and va, respectively, and on the second line, G and B are placed on
, R, and the 6th line, connect 'B, R, and G, respectively.

In FIG. 6, 11 inverting circuits (304) to (306) and 2-1 multiplex circuits (307) to (309)
) is a means for inverting the AC signal applied to the finished product panel.

Now, when supplying the 5 primary colors No. 48 demodulated from the NTSO system signal to the color active matrix panel mentioned above, as mentioned above, in a panel with 200 legs and 200 legs, adjacent fields are Sora is worried about Pai Lu's same Sora Hiichi.

The 5th problem is the standard set meal method (525 bottles), and on the 1st evening and 11th day, it is included in the 1Wj-scanning report on the 1st, 264.2nd, and 265th scanning line Kebanel. be.

When this scanning method is adopted, the number of effective scanning lines is 24.
If there are about 0 layers, sequential scanning becomes impossible. This is because, in the standard method, there are about 240 layers per field, or phrase effective scanning @numerical power transfer is not maintained.

If you adopt the jump running test that is suspended in OR'l, the frequency of primary color bokuni written to the running food section is once per frame, which is h-6, so the frequency of alternating current reversal ( is 2 frets, which corresponds to about 15H2 in frequency.

Human eyes? Since the limit for flickering on the 11th screen is about 50 Hz, this I-direction of 15H2 poses a problem in terms of flicker.

Also, is it the same primary color signal at the same time as the 14 adjacent two-shot wins on the panel? There is also a method that can be used to protect the wear and tear, but in this method, two pairs of 14 contact lenses are used, and the helmet is one of the same color filters.
1 Self Tari is not -C is bu: Cr4) It turns out that there is no one, so I took the opportunity to find out how many panels there are. Even if it is increased, the actual solution I in the vertical 1α direction (the force is not the same as above).

It is certain that in the future, as the manufacturing technology for pseudocrystalline panels improves, we will be able to use larger-area LCD panels at a cheaper price. , the number of scanning lines will inevitably increase.

Conventional liquid crystal panels of approximately 0.02 inch size have also been developed, so the picture size is likely to become smaller. This also means an increase in the number of scanning lines.

As mentioned earlier, if the number of scanning lines on the liquid crystal panel greatly exceeds the current 200, it will be impossible to improve the display performance of the liquid crystal panel using the current easy-to-understand scanning method. It is.

In the standard method of the NTsO method, the number of M scan lines is approximately 480, so it is difficult to improve the rock-scanning performance of the crystal ball. There is.

This commercial scale image power 2 panel is equipped with a special drive system that is different from conventional ones.

〔the purpose〕

This invention has been proposed to solve the above-mentioned problem, and is a driving method for a liquid crystal color skewer active matrix panel that performs scanning aXV*, which exceeds the number of effective scanning lines for one field in the standard television broadcasting system, which is 7. Our purpose is to provide the following.

[JRt robe]

According to the present invention, lI! l! Since the I image data can be generated in units of scans and interpolated by interlaced scans, it is possible to interpolate the scan lines that are missing by interlacing scans. - Can drive matrix panels.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

The sixth figure is a block diagram of the apparatus of the present invention.

Primary color signal input terminals (601), (j02), (603)
.

Three primary color signals R, G, and B are applied to each of Xl.

The three primary color signals are each sent to an A/D conversion circuit (604).
It is converted into a digital signal in real time at (605) and (606).

The three primary color signals converted to digital signals are temporarily stored in memory circuits (607), (60B), and (609), respectively.
It seems strange.

The three primary color signals stored in the memory 1 circuit are sent to the D/A converter 1 rear circuit (610), at an appropriate timing as described later.
It is transferred to (611) and (612) and converted back into an analog signal.

The three primary colors converted into analog signals are looped in a 3×6 matrix circuit (61, 5) during each horizontal scanning period.
Transmitted to the next stage.

Inversion circuits (614), (615),
(61 (S), the inverted signal and the in-phase signal are generated, and the 2-1 multiplex 1 river path (617), (6
18) and (619), the father's flow is reversed to Nobuyoshi, and the video signal is output to the Deba terminals (620), (621), and (622).

The 3x6 matrix circuit (613) is a conventional color active matrix circuit (613).
Based on the color filter with the color scheme shown in the second example. ) is the same as the drive system.

Based on the synchronization signal input to the synchronization signal input terminal (623) ICblJ/J[+, the control signal circuit (624) supplies the necessary control signals to each circuit.

Note that the vehicle pressure of the 3×6 matrix circuit (613) and the 2-1 multiplex circuits (617) to (619) is 0T11 in the same configuration as the conventional example.

Next, the configuration of the memory circuit will be explained.

The seventh problem is to use the 1H number every other scanning line that has been interlaced scanned to eliminate the structure of the memory circuit in the case where the missing scanning resistance is detected.

Primary color signal input terminal Rj: (701), Gi (702),
Add the R, G, and B primary color signals to B1 (703).

Each of the three primary colors is an A/D shock circuit (704) 2
, (705), (706) are converted into digital signals at the same time.

The three primary color signals converted to digital signals are each
It is temporarily stored in line memory FC3' paths (707) to (712).

Since the three R, G, and B series memory circuits shown in the seventh example simultaneously perform similar operations, the R signal series will be explained.

Each of the line memory circuits (707) and (708) has a data dψ for storing data for one horizontal set meal line. If one line is 480 pixels per scanning line of the liquid crystal panel, and 4 bits per A/D conversion line and 1 (704) matrix line, then 480 x 4 - 1920 bits (however, 4 bit structure 1) Must have hair. ) is required per line.

These two series of line memory 1h11 rumors R1 (801)
, R2(8,02) operate as shown in the timing diagram of FIG.

When R1 or primary color 1g + 5 n is stored in 1 horizontal set meal period (1H) (W), R2 is 1/2 horizontal scanning dome for 5 layers of 1 horizontal foot tatami before the 1 water jusho meal period Help...(N2H) and 2
The wing scanning line continuously protrudes f(R). Next one horizontal movement period V
When cR2 writes the primary color signal (W), R1 writes the signal written in horizontal footing period 1...(1H) of eye II to 1/
Two consecutive scans are read out with two horizontal yellow extraction intervals (1/2H) -f (R).

By repeating the above operation R1 and R2 alternately, the primary color signal that has been A/D is transferred to 2, and the output is 4.
It's not like my father has a strange personality.

At this time, two adjacent images displayed on the liquid crystal panel
The scan points are made from the same scan surface.

As shown in FIG. 9, for example, the (n-1)th scanning line Ln
-1 (901) and the next Ln (902) and (n+1) scan line Ln+1 (905) and the next Ln+ 2 (9
o4) are generated from the Ln-1 and Ln+1 primary color signals, respectively.

Digital No. 16 read from the line memory circuits (707) to (712) passes through 2-1 multiplex circuits (713) to (715), and then to D/A conversion circuits (716) to (7j8). Convert to analog signal,
The signal is sent to the next stage 5×3 matrix circuit (corresponding to (615) in FIG. 6).

2-1 multiplex episode B16 is the previous stage 2
Two series of signals from a series of line memory circuits are alternately selected for each horizontal scan.

Device of the invention6. To put it simply, it can be said that it is a time axis conversion device for three primary color signals.

In other words, it takes one horizontal movement period (263 μs) to input the three primary color signals, which takes 1/2 of that (32 μs).
By converting to , one scanning line is apparently expanded to two scanning lines.

〔effect〕

As mentioned above, according to Honguaki's composition, the human-powered drawing 1
By doubling the number of scanning lines of the home signal, we have made the liquid crystal color active matrix panel capable of scanning up to twice the number of effective scanning lines for one field, making it possible to use absenteeism. The history of high purity and high power of liquid crystal image display has the effect of improving the quality of images.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram of an active matrix Φ panel, Figure 2 is an example of a six primary color scheme for a color active matrix panel, Figure 3 is a matrix circuit for three primary color signals, and the fourth one is! rPrimary color signal) IJ box timing diagram,
Figure 5 shows the standard scanning method (525 lines), Figure 6 is a block diagram of the device of the present invention, Figure 7 (at~(cl memory circuit σ) configuration 1 tarry, Figure 8 shows the timing 1 of the memory circuit). Figures 9 and 9 show the arrangement of scanning lines on the crystal bar. (101) X transfer lock terminal, ('102) meta data pulse input terminal, (103) (109) shift register, ( 104) - (106) Video manual terminal, (1.0
7) Y data pulse input terminal, (108) Y transfer lock terminal, (110) analog switch, (111) pixel transistor, (112) pixel capacitor, (11,3) video line, (114) gate line (201) )～(2
03) Video line (5o1) to (305) 3 primary color signal input terminals, (304
) ~ (j06) Inversion circuit, (307) ~ (309) 2-
1 multiplex circuit, (510) 3X5 matrix circuit, (311) to (313) video signal output terminals (601) to (603) primary color signal input terminals, (604)
~ (6o6) A/D & switching circuit, (607) ~ (609)
Memory circuit, (610) to (612) D/A circuit, (613) 3X3 matrix circuit, (614) to (6
1 inversion circuit, ('(517) to (619) 2-1 multiplex circuit, (620) to (622) video signal output terminal 2 (625) synchronization signal input terminal, (+524) control signal generation circuit. 701) to (705) Primary color signal input terminals, (704 to (706) A/D conversion circuit, (707) to (712)
Line memory circuit, (715) ~ (715) 2-1 multiplex times (71'6) ~ (718 n D/A
Conversion circuit, (719) to (721) primary color signal output terminals (
aoi) ~ (8'06) Line memory circuit R,,RG
,,G,, Superintendent B, B2, (901) - (904) Above the horizontal scanning line on the liquid crystal panel Applicant Suwa Seikosha Co., Ltd. Agent Bengumon Tsutomu Mogami 6) Tsuyoshi Yano 13 No. 1 Figure 2 Diagram B7 Figure 3 IL 2L North 4L ILL I7L ---
−. Figure 4 Figure 5

Claims (1)

[Claims] In the color liquid crystal display device that drives the color active matrix display, there is an A/D converter circuit that converts the three primary color signals into digital signals, and a digital signal that is served by the A/D converter circuit and is held for a certain period of time. A color liquid crystal display device comprising a memory circuit for converting digital signals into analog signals, and a D/A conversion circuit for converting digital signals outputted from the memory circuit into analog signals.