JPH04338996A - Color panel display device - Google Patents

Abstract

PURPOSE:To offer the device which has the same picture elements in a common area of R, G, and B and does not use a color filter. CONSTITUTION:A display part 6 equipped with a light diffusion plate 3 and a display element 4 is provided on the opening end surface of a housing 16 and the light from a light source 1 is diffused by the light diffusion plate 3 to irradiate the display element 4. This display unit is equipped with mutually independent light sources 1R, 1G, and 1B of R, G, and B which are provided in a housing 16, an inverter which turns ON and OFF periodically and repeatedly those light sources 1R, 1G, and 1B of R, G, and B subsequently without any overlap, and a control circuit which separates an input image pickup signal into chrominance components and a luminance signal, converts the chrominance components into information on the time base so as to synchronize with the light sources 1R, 1G, and 1B, and processes the luminance signal as pulse width information with the chrominance components to drive the display element 4.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a PLZT color panel display device in a display unit with a backlight configuration.

0002

[Prior Art] In recent years, PLZT (for example (Pb0.91
Research and development of PLZT light valves using La0.09) (Zr0.65Ti0.35)O3) has become active. Conventionally, this type of PLZT display unit is made by bending a thin plate (for example, a stainless steel plate with a thickness of 0.1 mm) and applying white paint to the inner wall surface, as shown in FIG.
A reflecting plate 2 is formed on the front side) as a reflecting surface for light from a light source (for example, a fluorescent lamp) 1, a light diffusing plate 3 is formed on the open end surface of the housing, a PLZT wafer 4 as a display element, and a color filter 5 are formed. A display section 6 is attached thereto, and a circuit mounting body 7 is fixed to the outer surface side (back side) of the reflector plate 2. However, when the white light source 1 is lit as a backlight and one set of R, G, and B is used as one pixel, for example, when R is lit, the G and B areas are not lit to display color. Ta.

0003

[Problems to be Solved by the Invention] (1) Since a pixel area is required for each of R, G, and B within the display element 4, extremely fine processing is required to obtain a high-resolution image. may be limited or extremely expensive. (2) Considering one set of R, G, B as one pixel, for example, R
When lighting up, areas G and B are in a non-lit state,
The aperture ratio becomes one-third. (3) In a color panel display device, one way to increase the brightness is to make the light source 1 brighter, but to do so, it is necessary to further improve the transmittance of the color filter 5. be. The present invention was made to solve the above-mentioned problems, and an object of the present invention is to provide a device in which the same pixel is used as a common area for R, G, and B, and color filters are not used. That is.

0004

[Means for Solving the Problems] The present invention provides a display portion including a light diffusion plate and a display element on an open end surface of a housing, and diffuses light from a light source with the light diffusion plate to display the display element. In the display unit, the R, G, and B light sources are provided in the housing, and the R, G, and B light sources are turned on sequentially and periodically so that they do not overlap with each other. The input image signal is divided into a color signal and a luminance signal, the color signal is used as information on the time axis so as to be synchronized with the light source, and the luminance signal is used as pulse width information to combine with the color signal. A color panel display device comprising: a control circuit that performs calculations and drives the display element.

[0005]

[Operation] The R, G, and B light sources are turned on in sequence and periodically according to the signal from the inverter, and without overlapping each other with a blanking time t. In the control circuit,
The signal input from the image signal input terminal is divided into a color signal and a luminance signal, and among these, the color signal is converted as information on the time axis so as to be synchronized with the period of the backlight. The luminance signal is converted into a digital signal, stored in a memory as pulse width information, and calculated with the color signal to drive the display section. In this way, each light source periodically repeats on and off at a speed that cannot be followed by the human eye, and in synchronization with this, each pixel of the display section receives the R signal while the R is lit. is applied, a G signal is applied while G is lit, and a B signal is added while B is lit, so that a full-color display device is obtained due to the afterimage phenomenon.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a color panel display device according to the present invention will be described below with reference to FIGS. 1 and 2. At the back of the housing 16, an R reflector 2R, a G reflector 2G, and a B reflector 2B are provided as a backlight. , R light source 1R for R (red), G (green)
A G light source 1G for color and a B light source 1B for B (blue) are arranged at predetermined intervals. A light diffusing plate 3 is provided at the open end of the housing 16, and a transparent electrode substrate 9 is bump-connected to a display element 4 on which comb-shaped electrodes are formed on the front surface of the light diffusing plate 3. A display section 6 sandwiched between deflecting plates 15, 15 from both sides is attached, and a protective glass 10 is provided on the outermost side. Lead line portions 8 are integrally provided at both ends of the transparent electrode substrate 9.

FIG. 2 shows the drive circuit, in which the oscillator 13
is the R light source 1R and G light source 1G via the inverter 14.
, B light sources 1B, and these R light sources 1R,
The G light source 1G and the B light source 1B are sequentially and periodically turned on and off at a speed that cannot be followed by the human eye (for example, 20 Hz). In addition, each R light source 1R, G light source 1G,
A blanking time t is provided so that the lighting of the B light sources 1B does not overlap. A control circuit 12 is coupled to the image signal input terminal 11 and controls the display unit 6 by receiving a timing signal from the oscillator 13 . That is, the oscillator 13 separates the image signal input from the image signal input terminal 11 into a color signal and a luminance signal, and the color signal is converted as information on the time axis so as to be synchronized with the cycle of the backlight.
Further, the luminance signal is stored in a memory as pulse width information, and is calculated with the color signal to drive the display unit 6.

[0008] The operation of the above configuration will be explained. As shown in FIG. 2, the R light source 1R, the G light source 1G, and the B light source 1B are turned on in sequence and periodically according to a signal from the inverter 14 without overlapping each other with a blanking time t. The signal input from the image signal input terminal 11 is divided into a color signal and a luminance signal. Among these, the color signal is converted as information on the time axis so as to be synchronized with the cycle of the backlight. For example, looking at the R signal, it is not needed while G and B are being output, so
Data during this time will be discarded. The luminance signal is once A/D
The pulse width information is converted and stored in a memory as pulse width information, and is operated on the color signal to drive the display unit 6. Between each color signal,
Since there is a blanking time t, there is no mixing between the color signals. In this way, each R light source 1R, G light source 1G
, B light source 1B periodically repeats on and off at a speed that cannot be followed by the human eye, and in synchronization with this, each pixel of the display unit 6 displays an R signal while R is lit. added,
Since the G signal is applied while G is lit, and the B signal is applied while B is lit, a full-color display device is obtained due to the afterimage phenomenon.

[0009]

Effects of the invention (1) The aperture ratio per pixel is 3 compared to the conventional one.
This will significantly reduce screen roughness. (2) Since the size of one pixel is reduced to one-third, higher display density can be realized. (3) Color filters are no longer required, so the amount (
20-30%) Transmittance is improved. (4) Since it is not necessary to use white light as a light source, a monochromatic light source with high luminous efficiency can be used.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of a color panel display device according to the present invention.

FIG. 2 is a block diagram and a waveform diagram of a driving circuit of a color panel display device according to the present invention.

FIG. 3 is a plan view of a conventional color panel display device.

[Explanation of symbols]

1R...R light source, 1G...G light source, 1B...B light source, 2R...R
Reflection plate, 2G...G reflection plate, 2B...B reflection plate, 3...Light diffusion plate, 4...PLZT display element, 5...Color filter, 6
...Display part, 7...Circuit mounting body, 8...Leader line part, 9...Transparent electrode substrate, 10...Protection glass, 11...Image signal input terminal, 12...Control circuit, 13...Oscillator, 14...Inverter,
15... Deflection plate, 16... Housing.

Claims (1)

[Claims] 1. A display unit, wherein a display portion including a light diffusing plate and a display element is provided on an open end surface of a housing, and light from a light source is diffused by the light diffusing plate and irradiated onto the display element. In, R provided in the housing
, G, B, and these R, G, B
An inverter is used to turn on and off the light sources sequentially and periodically without overlapping each other, and the input image signal is divided into a color signal and a luminance signal, and the color signal is synchronized with the light source on the time axis. 1. A color panel display device comprising: a control circuit that calculates a luminance signal as pulse width information with the color signal and drives the display element.