JPH0396994A - Digital rgb color liquid crystal driving circuit - Google Patents

Abstract

PURPOSE:To make intermediate colors rich by inputting dot information whose N dots are compressed into one dot horizontally at an N-fold speed. CONSTITUTION:Pieces of compressed digital dot information H-R and L-R, H-G and L-G, and H-B and L-B which have horizontal N=2 dots compressed into one dot and differ in density are inputted to liquid crystal through a latch circuit 5 and a selector circuit 6. Those circuits 5 and 6 are controlled at N=2, i.e. twice as fast as normal dots with a clock of frequency twice as high as the frequency of a clock for normal dots from a dot clock oscillation circuit 7 and a two-fold number of dots which differ in density are combined to make display intermediate colors rich, thereby obtaining the digital RGB color liquid crystal driving circuit suitable for an on-vehicle display.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention uses analog RGB signal generation signals for CRT while ensuring a sufficient viewing angle and contrast.
The present invention relates to a digital RGB color liquid crystal drive circuit that increases the variety of colors that can be displayed.

BACKGROUND ART Conventionally, as shown in FIG. 7, in a digital RGB color liquid crystal 10, one set of BRG is handled as one dot, and each color B, R, and G as dot components are digitally controlled. Therefore, depending on the combination, B, R
, G is configured to display intermediate colors other than G. Specifically, for each B, R, and G, an H level signal and an L level signal are
level signals are selectively given, H-B or L-B,
By combining HR, LR, H-GH, or LG, intermediate colors other than the primary colors B, R, and G can also be displayed.

Problems to be Solved by the Invention However, with such conventional drive systems,
Since color display is performed using the combinations described above, the number of colors that can be displayed in principle is 23, that is, 8 colors.
Only five intermediate colors other than the primary colors B, R, and G can be displayed. Of course, even with such a drive system that treats BR and G as 1 dot 1, it is necessary to perform controls such as setting the degree of opening of the nyatta to half-open, or dynamically operating the nyatta to divide the opening time into smaller parts. Is it a simulated first year of middle school?
Jj colors can be displayed, making it possible to enrich the colors. However, controlling in this way not only reduces the contrast but also narrows the viewing angle. As in the case of
It is not suitable for use in a device that needs to ensure sufficient viewing angle and contrast.

Therefore, if a CRT is used, the viewing angle, contrast,
It is possible to satisfy all the necessary conditions for navigation such as richness of colors, but due to the large depth dimension of CRT, today's electronic components, Placing a CRT with a larger depth on the instrument panel 1, where control parts, etc. are concentrated, is a problem in layout 1.
・The above difficulties would arise.

The present invention has been made in view of the above-mentioned conventional problems, and it is possible to increase the number of colors that can be displayed using a color liquid crystal with a small depth dimension while ensuring a sufficient visual angle and distance. It is an object of the present invention to provide a digital RGB color liquid crystal drive circuit which is enriched in variety.

Means for Solving the Problems In order to solve the above problems, the present invention uses ordinary N dots in digital RGB liquid products, for example, ordinary 2
Each dot is simulated as one dot, and twice the number of dots as the corresponding CRT is set in the horizontal direction, while the tintal RGB signal before analog RGB signal generation for the CRT is input alternately every one dot. In addition, input speed control means is provided for controlling the manual speed of the digital RGB signal to double in the horizontal direction.

Effect In the above configuration, the normal 2 dots on the digital RGB liquid crystal are treated as 1 dot and 1 dot in the present invention, and more specifically, the 1 dot and 1 dot of the present invention are
・There are two each of 1' one-component scale, G, and B, and the signal input means has two one-component scales, G, and B.
Digital RGB signals of each color corresponding to G and B alternately,
In other words, R, G, B I-1 level signals, ■7 level signals, H-R and L-R, ■1G, 1G, 1-
13, r, -ri.

At this time, in the present invention, since there are two of each of Dosoto Bokubun R, G, and B in one dot simulated as described above, each F TsuI, Bokubun RG, A finite number of intermediate colors of eight or more colors are formed from a combination pattern in which B is set to H level or I7 level. Moreover, in the horizontal direction input of the digital RGB signal,
Since twice the speed is given by the manual speed control means, the number of dots in the horizontal direction is doubled by including two normal dots in one dot of the present invention. However, there is no effect on the display speed, and CR
Display can be performed using digital RGB signals before generation of analog RGB signals for T.

EXAMPLE An example of the present invention will be described below with reference to the drawings. That is, as shown in FIG. 1, in this practical example, the tintal RGB liquid crystal 3 has two normal dots, that is, normal 1 dots, 1 dots, and 1 dots.

A matrix combining a pair of horizontally in the horizontal direction is simulated as one dot (hereinafter referred to as fictitious one dot D1).Therefore, in fictitious one dot l-D, dosotobokun R, G, B are as follows. There are two of each.

The digital RGB ilt 2 item 3 has a corresponding 6-inch CRT top 1 and number (horizontal direction).
Since it is 320x200 (vertically), it is a normal 1 tot D. is the minimum unit, then 2 in the horizontal direction
The setting is 640 dots, which is double the number of dots.
As shown in FIG.
Digital RG of R, t+-G, +T-B
The assignment is such that only the B signal is input.

Said LR, LG, >B and HR, HG, +{-8
The digital RGB signals are, as shown in FIG.
The signal is supplied to a selector circuit 6 serving as a signal input means via a launch circuit 5 at step 1j.

On the other hand, the dot 1 clock generation circuit 7 as a manual speed control means is connected to a CRT shown by a chain line in FIG.
Totto Kurosoku Y). It has the property of outputting the clock P1 at a speed of 2-14, and
・Clock P. is input to the latch circuit 5, and is also input to the selector circuit 6 via the binary counter 8.

In this embodiment with the above configuration, each digital RGB signal LR, LG, LI3 and H-R, }{- before being generated into an analog signal by the analog generation circuit 4
G, I-1-B are latched by the latch circuit 5, and then H-R, LR, H-G, LG. ．． I-I
-B and LB are output alternately. Therefore, if each of these digital RGr3 signals is assigned as described above with reference to FIG.
The combinations shown in the figure are possible.

In Figure 5, H-X is H-R, H-G HB
, L - X indicates L-R, L-G, >B, respectively, and the combination where I-I-X shown with diagonal lines is IQ, J, and L-X is "1" is CRT. Since this pattern is not used as a control pattern, it is treated similarly in this embodiment, and thus each input pattern (a), (mouth), and (c) is appropriately formed for each of R, G, and B.

Therefore, by setting the pair of Dosoto Bokun R, G, and B to the three-person pattern (A), (mouth), and (C), each virtual dot D has 33, that is, 27 types. In other words, it becomes possible to display 7 colors of 27 colors for each virtual 1 to 1 D pattern. Therefore, it is naturally possible to display a rich variety of intermediate colors. To give specific examples, the Dono 1 pattern in FIG. 6(A) can display gray, and It is possible to display the color of the egg depending on the I/pattern.

At this time, since the display is performed using digital RGB signals, each dot 1, a certain amount R, G,
Since the input of B becomes rOJ or "1", it is possible to control the shutter to be fully open or fully closed, so that a sufficient contrast I can be ensured and the visual angle can be secured.

Moreover, the input of the digital RGB signal in the horizontal direction is performed by the dot clock generation circuit 7 at 2 {r″S
Since the speed is given by By using the FukuGF3 signal, it is possible to display crystals with a small depth dimension.

Therefore, while satisfying all the necessary conditions for an in-vehicle navigation system, such as viewing angle, contrast, color richness, etc., the navigation system can be used as an instrument panel without any layout constraints. This not only makes it possible to arrange the LCD screen, but also allows the change from CRT to color liquid crystal at low cost.

Although only RGB signal circuits are shown in Fig. 3, when used as a monitor for the above-mentioned navigation system, etc., signals normally required for controlling CRTs, LCDs, etc., such as horizontal synchronization signals and vertical synchronization signals, are used. Of course, this is essential.

Effects of the Invention As explained above, the present invention simulates N dots 1 of a digital RGB liquid product as 1 dot 1 to perform color display control. There will be N pieces of each dot component R, G, B, and each dot component R, G, B will display a finite number of colors of 8 or more from the combination pattern input to the H level or I7 level. It becomes possible to do so. Therefore, intermediate colors are abundant, and since it is displayed using digital RGB signals, it is possible to control the display to be fully open or completely silent, so that it is possible to reduce
It is possible to increase the number of intermediate colors without having disadvantages such as narrowing the jl angle.

Therefore, driver visibility is important, and it is necessary to ensure sufficient viewing angle and contrast, like the navigation system located on the instrument panel of a car that displays detailed data about the driving route. It can also be used as a device, and since the neutral colors are abundant, it is possible to provide a navigation system with less eye fatigue.

In addition, in this way, it is possible to satisfy all the necessary conditions for a navigation system mounted on IIJ, such as viewing angle, contrast, and richness of colors, without using a CRT. With the diversification of various types of control, electronic parts, control parts, etc. are placed in a concentrated manner.
It becomes possible to mount a navigation system on the Lumen I/Pal without any layout difficulties.

Furthermore, by using digital RGB signals before analog RGB signal generation for CRT, and controlling the manual speed, each target. , l-, so that
It is possible to create a color liquid crystal display using a unit designed for a general-purpose color CRT, which allows C.R.
There is something that makes it possible to change from T to color crystal at low cost.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an IF note of an embodiment of the present invention;
Fig. 2 is a schematic diagram showing the allocation of each dot component in the same embodiment, Fig. 3 is a circuit diagram of the same embodiment, Fig. 4 is an output time chart of the same embodiment, and Fig. 5 is a diagram showing the assignment of each dot component. FIG. 6(A) is a schematic diagram showing the dot 1 pattern in gray display of the same embodiment. FIG. 6(B) is a schematic diagram showing the dot 1 pattern in egg color display of the same embodiment. A schematic diagram showing the pattern, Fig. 7 is a schematic diagram without showing the conventional digital RGB liquid product. 3. Digital RGB ifi, crystal, 4. Analog generation 11 circuit, 5. Lanochi circuit, 6. Selector circuit (signal input means), 7. Don 1. Crossoku generation circuit (input speed control means). 12

Claims (1)

[Claims] (1) The normal N dots in a digital RGB liquid crystal are assumed to be 1 dot, and the number of dots is set in the horizontal direction to be N times that of the corresponding CRT.
Input speed control that includes signal input means for alternately inputting digital RGB signals before B signal generation for each of the normal dots, and controlling the input speed of the digital RGB signals by N times in the horizontal direction. A digital RGB color liquid crystal drive circuit characterized in that a means is provided. (However, the above N is a natural number of 2 or more.)