JPH08234159A - Multicolor display device for liquid crystal display - Google Patents

Abstract

PURPOSE: To unnecessitate position of a segment and a sheet or a print and moreover to enable to make multicolors in a single segment and also to make multicolors in one screen by sinchronizing the light emitting drive of selected light sources with the drive of a liquid crystal displayer. CONSTITUTION: A bias is applied to the A of a segment 1a for 1/90sec. and simultaneously red LED 3 by a duty ratio 2/3 and green LED 4 by a duty ratio 1 are respectively driven from a control device 2 consisting of a microcomputer. A bias is applied to a B of a segment 1b for a next 1/90sec. and simultaneously red LED 3 and green LED 4 are respectively driven by a duty ratio 1. Moreover, a bias is applied to a C of a segmeny 1c for 1/90sec. and simultaneously all LED 3 to 5 are driven. Since yellow, pink and white are seen as continuous lighting by repeating these operations, a multicolor display is made possible in the same screen.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device using liquid crystal as a display device, in combination with a light emitting device of three primary colors,
The present invention relates to a multicolor display device for a liquid crystal display, which is intended to realize color display of the liquid crystal display.

[0002]

2. Description of the Related Art Conventionally, various methods have been proposed as a method for displaying liquid crystal in multiple colors. FIG. 9 is a block diagram showing a conventional multicolor display device of a liquid crystal display. In the figure, 1 is a liquid display, 2 is a liquid crystal drive circuit, 9 is a sheet, 1
0 is a lamp. The operation of the conventional multi-color display device of the liquid crystal display configured as described above will be described.

A sheet 9 for coloring is installed on the surface of the liquid crystal display 1 to be colored. This liquid crystal display is displayed in color by being illuminated with white light from the lamp 10 from below. CO of liquid crystal drive circuit 2
When a bias voltage is applied between the M terminal and the SEG1 terminal,
The segment 1a of the liquid crystal display 1 is in a transmissive state, and the white light emitted from the lamp 10 is transmitted through the liquid crystal display 1 and the part 9a of the sheet 9 to thereby develop the color of the part 9a. Is. There is also a liquid crystal display that is colored without using a sheet.

[0004]

However, in such a conventional multicolor display device of a liquid crystal display, when the segments 1a to 1c are small and complicated, the positions of the segments 1a to 1c and the sheets 9a to 9c are reduced. There is a problem in that it is difficult to match the colors, and therefore it is difficult to arrange colors of complicated segments. Also, one segment 1a-
Since only one color is assigned to 1c, there is a problem in that it is difficult to develop a plurality of colors in the same segment.

The present invention has been made in view of the above problems, and does not require alignment between segments and sheets or prints, and enables multicoloring in a single segment and multicoloring within one screen. An object of the present invention is to provide a multicolor display device of a liquid crystal display.

[0006]

In order to achieve the above object, a multicolor display device of a liquid crystal display according to the present invention is, in claim 1, a liquid crystal display and a light source of a plurality of colors for illuminating the liquid crystal display. A liquid crystal drive unit for driving the liquid crystal display, a light source drive unit for driving the light source, and a control unit for controlling the light source drive unit and the liquid crystal drive unit. It is characterized in that the light emission drive of the light source is synchronized with the drive of the liquid crystal display.

According to a second aspect of the present invention, the light source driving means drives the selected plurality of light sources at the same time so that they are simultaneously turned on.

According to a third aspect of the present invention, the light source driving means drives the selected plurality of light sources in a time division manner.

According to a fourth aspect of the invention, the liquid crystal display is
It has a plurality of segments forming each image, and has a plurality of light sources corresponding to the respective segments.

[0010]

With the above structure, in the first aspect, the liquid crystal display, the light sources of a plurality of colors for illuminating the liquid crystal display, the liquid crystal driving means for driving the liquid crystal display, and the light source driving means for driving the light source. And a control means for controlling the light source drive means and the liquid crystal drive means, and the light emission drive of the light source selected from the light sources of the plurality of colors and the drive of the liquid crystal display are synchronized, so that the segment and the sheet Alternatively, it is not necessary to perform printing alignment, and it is possible to use multiple colors in a single segment and multiple colors within one screen.

Further, according to the present invention, the light source driving means drives the selected plurality of light sources at the same time periodically,
It is not necessary to align the positions of the segments and the sheets or the printing, and it is also possible to use multiple colors in a single segment and multiple colors within one screen.

In the third aspect, the light source driving means drives the selected plurality of light sources in a time-divisional manner, so that alignment of the segment and the sheet or printing is unnecessary, and the multicolor in a single segment is further eliminated. It is also possible to realize high resolution and multiple colors within one screen.

Further, according to the present invention, the liquid crystal display has a plurality of segments forming each image and a plurality of light sources corresponding to the respective segments. Positioning is unnecessary, and multicoloring in a single segment and multicoloring within one screen are possible.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A multicolor display device of a liquid crystal display according to the present invention will be described below with reference to the drawings. FIG. 1 is a schematic block diagram showing the configuration of a multicolor display device of a liquid crystal display in a first embodiment of the present invention. In the figure, 1 is a liquid crystal display, 2 is a control device, and 3 to 5 are light sources composed of light emitting diodes (hereinafter abbreviated as "LED"). Control device 2
Includes a liquid crystal drive circuit 2a, an LED drive circuit 2b, and a control circuit 2c. These liquid crystal display 1, control device 2, LE
FIG. 2 shows a specific connection relationship of D3 to D5. The operation will be described below with reference to the wiring diagram.

The liquid crystal display 1 includes a plurality of segments 1a.about.
1c as a common (hereinafter abbreviated as "COM") terminal for each segment, and 1g for driving each segment (hereinafter referred to as "S").
1h to 1j correspond to terminals (abbreviated as "EG"). The control device 2 comprises a microcomputer,
Biasing the COM terminal and each SEG terminal,
The timing for driving the LEDs 3 to 5 is designed.

Each segment of the liquid crystal display 1 is transparent when the potential difference between the corresponding COM terminal and SEG terminal is bias-controlled to a certain level or more. Further, this bias is controlled by an AC bias in order to prevent deterioration of the liquid crystal display.

LEDs 3 to 5 are used as a light source of a plurality of colors for illuminating the liquid crystal display 1, because the transient response speed of light emission is required. In addition, red LED3, green LED4, blue LE for full colorization.
The three primary colors of D5 light are used. Also, LEDs 3-5
The reason why a plurality of pixels are arranged is to reduce color unevenness on the liquid crystal surface. Further, the resistors 6 to 8 are merely resistors for controlling the current and have nothing to do with the essence of the present application.

Now, referring to FIG. 3, the display of the liquid crystal display 1 is displayed every 2 seconds by using the apparatus shown in FIGS. 1 and 2, "A" .fwdarw. "B" .fwdarw. "C".
Change to red when "A", "B" and "C"
In the case of, it is a time chart for displaying in green. The control device 2 controls the RED terminal connected to the red LED when the SEG 1 is biased as shown in FIG.
When 2 and SEG3 are biased, the GREEN terminal connected to the green LED is controlled. It is possible to arbitrarily set which character is to be emitted in which color, and it is also possible to change the color arrangement of the character on the way. Further, as shown in the time chart of FIG. 4, the LEDs 3 to 5 of the three primary colors are arbitrarily turned on, so that the colors red, green, blue, orange, blue green, purple, and white are displayed.
Color emission is also possible.

Further, as shown in FIG. 5, it is possible to change the light amount of each LED in 256 steps, for example, by optionally driving the LED of three colors by pulse width modulation (hereinafter abbreviated as "PWM") at high speed. Thus, as shown in FIG. 5, it is possible to emit light of yellow, pink, purple, etc., which the LED itself does not have. Further, as in this embodiment, since the LEDs are the three primary colors of light, full color compatibility is also possible.

Further, by switching the segments 1a to 1c in synchronization with the LEDs and performing them at high speed, as shown in FIG. 6, "A" is yellow, "B" is pink, and "C" is white on the same screen. Multicolor display is also possible.

That is, the red LED 3 is driven at a duty ratio of 2/3 and the green LED 4 is driven at a duty ratio of 1 at the same time as "A" of the segment 1a is biased for 1/90 seconds by the control device 2 including a microcomputer. . Then segment 1b for the next 1/90 second
At the same time as "B" is biased, the red LED 3 and the blue LED 5 are driven at a duty ratio of 1, respectively. 1 more
Bias "C" of segment 1c for / 90 seconds and simultaneously drive all LEDs 3-5. By repeating this, yellow, pink, and white appear to be lit continuously, and multicolor display is possible on the same screen.

Now, FIG. 7 is a connection diagram of a multicolor display device of a liquid crystal display according to a second embodiment of the present invention. In the figure, a large number of small segments are arranged on the liquid crystal display 1, and each of the segments is connected to the microcomputer 2
(Control device 2) sequentially drives. The color corresponding to the segment of STE STE and the segment is similarly set to the microcomputer 2.
In this way, the LEDs 3 to 5 of the three primary colors are driven by PWM at high speed to generate a color, and by synchronizing these two drives, full color display is possible.

Moreover, if all the segments are repeatedly driven for about 1/30 second, the human eye has an afterimage phenomenon, which is recognized as a continuous image. If this is used as a television signal, a full-color moving image is displayed. Will also be possible. A specific sequence at this time is shown in FIG. Needless to say, the display area can be increased by arranging a large number of segments using a liquid crystal display.

[0024]

As described above, according to the multicolor display device of the liquid crystal display of the present invention, in claim 1, the liquid crystal display, the light sources of a plurality of colors for illuminating the liquid crystal display, and the liquid crystal display. A liquid crystal driving means for driving the light source, a light source driving means for driving the light source, and a control means for controlling the light source driving means and the liquid crystal driving means. Since the driving of the liquid crystal display is synchronized with each other, it is not necessary to align the segment and the sheet or the printing, and it is possible to achieve multicolor in a single segment and multicolor in one screen. is there.

Further, when a part of the liquid crystal display is desired to be colored, the color shift between the part and the colored part does not occur, and when the color of the part is desired to be changed depending on the state, the color of the light source to be driven is switched. There is an effect that it can be easily realized only by. In addition, by turning on multiple colors of the light source at the same time, it is possible to generate more colors than the number of colors of the light source.
By using the three primary colors of light as the light source, there is an effect that white display is possible.

Further, by driving each light source, for example, by PWM, the amount of light for each light source can be arbitrarily changed, and if the three primary colors of light are used as the light sources, full color display is also possible. .

In the second aspect, since the light source driving means drives the plurality of selected light sources at the same time periodically,
There is an effect that the alignment of the segment and the sheet or the printing is not necessary, and the multi-coloring in a single segment and the multi-coloring in one screen can be performed.

In the third aspect, the light source driving means drives the selected plurality of light sources in a time-division manner, so that alignment between the segment and the sheet or the printing is unnecessary, and the multicolor in a single segment is not required. There is an effect that it is possible to realize high resolution and multiple colors within one screen. This also gives
There is an effect that full-color display is possible on the same screen of many segments.

Further, according to the present invention, the liquid crystal display has a plurality of segments forming each image and a plurality of light sources corresponding to the respective segments. There is an effect that alignment is not necessary, and that it is possible to realize multicolor in a single segment and multicolor in one screen.

[Brief description of drawings]

FIG. 1 is a block schematic diagram showing a configuration of a multicolor display device of a liquid crystal display in a first embodiment of the present invention.

FIG. 2 is a wiring diagram in the example.

FIG. 3 is a diagram showing a first drive timing in the embodiment.

FIG. 4 is a diagram showing a second drive timing in the embodiment.

FIG. 5 is a diagram showing a third drive timing in the embodiment.

FIG. 6 is a diagram showing a fourth drive timing in the embodiment.

FIG. 7 is a diagram showing a connection of a multicolor display device of a liquid crystal display in a second embodiment of the present invention.

FIG. 8 is a diagram showing drive timing in the example.

FIG. 9 is a diagram showing a connection of a multicolor display device of a liquid crystal display in a conventional example of the present invention.

[Explanation of symbols]

 1 Liquid crystal display 2 Control device 3-5 LED

Claims (4)

[Claims] 1. A liquid crystal display, a light source of a plurality of colors for illuminating the liquid crystal display, liquid crystal driving means for driving the liquid crystal display, light source driving means for driving the light source, the light source driving means, and A control means for controlling the liquid crystal driving means, wherein the light emission drive of the selected light source of the light sources of the plurality of colors and the drive of the liquid crystal display are synchronized with each other. apparatus. 2. The multi-color display device of a liquid crystal display according to claim 1, wherein the light source driving means drives a plurality of selected light sources at the same time so as to be turned on at the same time. 3. The light source driving means drives the selected plurality of light sources in a time division manner.
The multicolor display device of the liquid crystal display according to item 1. 4. The liquid crystal display device has a plurality of segments forming each image, and a plurality of light sources corresponding to the respective segments.
4. A multicolor display device of the liquid crystal display according to any one of 3 to 3.