JPH03217818A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To allow the displaying to specific colors per digit or segment with an LCD which displays numbers, etc., using back lights by synchronizing the light emission of the back light of a specific color and the driving of the specific digit or segment of the LCD. CONSTITUTION:The back lights of three primary colors, red, green and blue are used for the LCD 8 and the displaying is executed by synchronizing the light emission of the backlight of the specific color and the driving of the specific digit or segment of the LCD. A light source driving circuit 4, a digit display driving circuit 6 and a segment display driving circuit 7 are respectively driven in accordance with the instruction of a control circuit 2. Namely, the respective light emitting bodies 5 are made to emit light successively by a control circuit 2 and the digits or segments of the LCD 8 desired to be displayed to the specific color are simultaneously driven in synchronization with the light emission of the specific color, by which the displaying of the specific color per digit or segment is executed. Changing of the display colors is possible as well by combining the two or three colors of the back lights.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a color display method for a liquid crystal display device.

[Prior Art] Conventionally, a liquid crystal display device (hereinafter referred to as an LCD) for displaying numbers, etc. consists of a glass plate equipped with electrodes and containing a liquid crystal cell, sandwiched between upper and lower sides by deflection plates whose deflection axes are perpendicular to each other. By placing a reflective plate underneath and applying a voltage to or blocking the liquid crystal cell to block or transmit incident light, a contrast between light and dark was obtained to display numbers and other information. Also, an LCD using a backlight is the opposite of the above, in that a glass plate with electrodes and a liquid crystal cell enclosed therein is sandwiched at the top and bottom between deflection plates with parallel deflection axes, and a hank light is placed below.
Numbers and other information were displayed by applying or blocking a voltage to the liquid crystal cell to allow or block the backlight.

In this case, by using colored light in the backlight, arbitrary colored numbers etc. can be obtained, but in order to obtain multiple colors, it is necessary to place multiple color light sources in the back and switch electrically.

Furthermore, even if multiple color light sources were placed in a bank, it was impossible to change the color for each digit unless multiple color light sources were placed for each digit and the colors were switched electrically.

[Problems to be solved by the invention] As described above, in conventional LCDs, even in display systems that use multiple C lights, color display for each digit or segment is not possible. It required multiple color light sources for each color, and required an electric switch to switch between the light sources, making the structure complex and extremely difficult.

[Means to solve the problem]

In order to solve the above problem, an LCD color display method is provided that synchronizes the light emission of a specific color octopus light and the driving of a specific digit or segment of the LCD in an LCD displaying numbers, etc. using Hasokite.

(Function) As mentioned above, by synchronizing the light emission of the specific color pack light and the drive of a specific digit or segment of the LCD, the three colors of red, green, and blue are used for the hand pack light, and they are emitted sequentially. At the same time, by driving the digits or segments of the LCD to be displayed in a specific color in synchronization with the specific color emission, it is possible to display each digit or segment in a specific color.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a diagram showing conditions for operating four digits of a display device in four colors.

In the figure, ■ is an input device such as numeric keys for inputting display data, and 2 is a control circuit that controls digit display, segment display, and light emission of the bank light as a display device, which controls all function keys of input device 1. It is connected. 3
is a scanning counter that serves as a control standard. 4
1 is a backlight light source drive circuit, which is connected to each light emitting body 5 so that each of the three color light sources can emit light independently. Examples of this light emitting body include flash lamps and LEDs (
Use a diode with good transient characteristics, such as a right-emitting diode (Right Emitting Diode). 6 is a digit display drive circuit of the display device, and in the figure, it is shown as 4 digits as an example, but
The connections are configured so that each digit can be driven. 7 is a segment display drive circuit of the display device, which is connected so that each segment of each digit can be driven independently. The light source drive circuit 4, the digit display drive circuit 6, and the segment display drive circuit 7 are each connected to the control circuit 2, and are each driven according to instructions from the control circuit 2. 8 is an LCD. Figure 2 shows the four digits on the LCD in red, green,
This figure shows the conditions when operating in four colors, blue and yellow. In this case, if the 4th digit is set to red, the 4th digit and the segment drive will be activated at the same time as the red light is emitted while the three primary color backlights are emitted in repeated order after a certain period of time. By driving the circuit, the red light of bathoclite can be transmitted and displayed in red. Next, the third digit and segment drive circuit are driven in synchronization with the green light emission, and the display is displayed in green.

The second digit, blue, operates in the same way. For the first digit, yellow, if the digit and segment drive circuits are driven in synchronization with red and green light emission, the two colors of light will pass through after a certain period of time, but due to the afterimage phenomenon of the human body, the display will be yellow.

In the LCD configured as described above, when it is desired to display a specific digit or segment in a color other than the three colors mentioned above, as in the example of the first digit yellow, the backlight 2
By combining a color or three colors and by adjusting the brightness of the combined colors, the colors can be changed at will to display multiple digits or segments in different colors.

Therefore, by taking advantage of these characteristics, various sensors (not shown in the diagram) can be connected to the control circuit, and their values can be displayed in different colors depending on preset conditions such as temperature, humidity, pressure, and speed. It can also be used as a caution, warning, or other information.

[Effects of the Invention] As explained above, the present invention synchronizes the light emission of the specific color backlight of the three primary colors and the driving of a specific digit or segment of the LCD in an LCD for numbers etc. using Hank lights of the three primary colors. By doing so, each digit and each segment of the LCD can be displayed in a different color, which allows the LCD to have a larger amount of information.
Effective as a display device.

[Brief explanation of drawings]

FIG. 1 shows a block A showing an embodiment of the present invention. FIG. 2 shows the conditions when the four digits of the LCD are operated in four colors: red, green, blue, and yellow. In the figure, 1 is an input device, 2 is a control circuit, 3 is a scanning counter, 4 is a light source drive circuit, 5 is a light source lamp, 6 is a digit display drive circuit, 7 is a segment display drive circuit, and 8 is an L
It is a CD display device.

Claims (2)

[Claims] (1) A liquid crystal display device that uses a backlight to display numbers, etc., characterized in that the light emission of a specific color backlight and the drive of a specific digit or segment of the liquid crystal display device are synchronized. (2) Using three colors of red, green, and blue for the backlight,
2. A liquid crystal display device according to claim 1, wherein specific digits or segments are displayed in different colors by a combination of those colors.