KR19980086305A - Flat panel display - Google Patents

Abstract

The flat panel display of the present invention is used to display a predetermined image in a video display device such as a monitor and a television receiver.

According to the present invention, an electrode is formed in the organic EL plate in a longitudinal direction and operated by applying an image signal of one line to the electrode, and the liquid crystal shutter plate is formed in front of the organic EL plate by forming an electrode in the horizontal direction. By selectively applying power to the electrodes of the liquid crystal shutter plate according to the video signal lines for operating the organic EL plate, light generated while the organic EL plate is operating passes through the liquid crystal shutter plate to form a screen one by one. Can be manufactured easily, and a large screen can be manufactured simply.

Description

Flat panel display

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat panel display device used for displaying a predetermined image in various image display devices such as a monitor, a wall-mounted television receiver, a high definition television receiver, and the like.

In general, image display devices use a cathode ray tube as a display device for displaying a predetermined image.

The cathode ray tube is provided with an electron gun inside the neck portion, and a color screen having fluorescent surfaces of R, G, and B is formed in front of the electron gun.

And a deflection coil for horizontally and vertically deflecting the electron beam emitted from the electron gun is provided outside the neck portion of the cathode ray tube.

The electron gun outputs R, G, and B electron beams according to a predetermined image to be displayed on a color screen, and is fired to the front color screen, and the deflection coils have horizontal deflection magnetic fields and vertical deflections according to a horizontal synchronization signal and a vertical synchronization signal. Generate a magnetic field.

Therefore, the three electron beams emitted from the electron gun collide with the fluorescent planes of R, G and B of the front color screen while being deflected horizontally and vertically according to the horizontal deflection magnetic field and the vertical deflection magnetic field, and a predetermined image is displayed.

However, the above-described cathode ray tube differs in length depending on the center of the color screen and the positions of up, down, left and right from the electron gun.

Therefore, the image is displayed in accordance with each position of the color screen.

That is, images of objects having the same size are displayed in different sizes according to positions displayed on the color screen.

In addition, since the cathode ray tube has a limitation in realizing a large screen, it is heavy, and the length of the cathode tube needs to be formed long due to the gap between the electron gun and the color screen, so the thickness of the product cannot be made thin.

Therefore, in recent years, much efforts have been made to use thin-film TFT-LCD (Thin Film Transistor-Liquid Crystal Display) or OFFS (Optical Fiber Flat Screen) as a display device for video display devices. .

The TFT-LCD consists of a backlight and a liquid crystal layer, and the liquid crystal layer consists of a TFT and an LCD.

The TFT is manufactured by a semiconductor process of multilayer deposition.

The LCD is composed of a SiO ₂ substrate, an Indium Tin Oxide (ITO) electrode, a polarizer, a color filter, a liquid crystal, and the like.

The color filter is coated with three primary colors of light of R, G, and B for each pixel, and white light output from the background light passes through the liquid crystal and the color filter to implement a predetermined color.

At this time, the gray scale is controlled by controlling the voltage applied to the liquid crystal for each pixel, and each pixel is driven in a matrix.

Therefore, one TFT is required for each pixel, for example, when a color TFT-LCD having a resolution of 1024x768 is required, 1024x768x3 = 2.4 million TFTs are required.

In addition, TFT-LCD is basically manufactured by semiconductor process, which requires expensive equipment and a very clean environment, resulting in higher production costs, and additional material costs such as color filters and background lighting.

In addition, the size of the screen must be large for wall-mounted television receivers and high-definition television receivers, but TFT-LCD requires the deposition of multiple layers of thin films using the whole of the original glass as one process and combined with the liquid crystal layer. There is a very difficult problem.

The OFFS uses a light emitting diode diode (LED) array as a light source, and is composed of an optical fiber array plate (OFAP) and a liquid crystal shutter plate (Liquid Crystal Shutter Plate).

LEDs of R, G, and B are used for each pixel of the LED array, and the LEDs are connected to the ends of the optical fibers of the OFAP so that light output from the LEDs is incident to the inside of the optical fibers.

Here, the number of LEDs required depends on the resolution in the transverse direction.

Therefore, in the case of a video display device having a resolution of 1024 x 768, 1024 x 3 = 3072 LEDs are required.

The optical fiber of the OFAP is placed parallel to each other on the base plate by three times the resolution in the transverse direction (requires three in R, G and B), and the light incident from the LED into the optical fiber will leak to the side of the optical fiber. The sides of the fiber are machined to make it possible.

In other words, the side surface of the optical fiber is scratched, and the light incident from the LED to the end of the optical fiber leaks to the outside through the scratched portion of the optical fiber so that the user can see the line light sources (line light sources) ).

In the longitudinal direction of the optical fiber, light having a constant color and brightness is scattered so that the user can see the light.

The liquid crystal shutter plate acts as a shutter to turn on and off an entire line in the lateral direction so that image data of the selected line is visible.

Power is applied to the electrode of the selected one line, and all the other unselected lines are turned off so that the image data of the selected one line can be viewed.

Therefore, the liquid crystal shutter plates require 768 in the case of a video display device having a resolution of 1024 × 768.

As shown in FIG. 1, the driving circuit for driving the OFFS includes a data interface unit 1 for interfacing an image signal input from a computer system or the like, and an OFFS (4) according to an output signal of the data interface unit 1. And a liquid crystal shutter plate driver 3 for driving the liquid crystal shutter plate of the OFFS 4 in accordance with the output signal of the data interface unit 1.

The driving circuit configured as described above outputs a video signal to the light source driving unit 2 line by line by the data interface unit 1 and outputs a video signal of one line to the light source driving control unit 2. One drive signal is output to the controller 3.

Then, the light source driver 2 drives the LED array of the OFFS 4 according to the input image signal line by line, and the light output from the driven LED is incident on the optical fiber and leaks through the scratched portion.

The liquid crystal shutter plate driver 3 operates the liquid crystal shutter plate of the first line according to the output signal of the data interface unit 1 to form the screen of the first line.

When the screen configuration of the first line is completed in this way, the light source driver 2 drives the LED array of the OFFS 4 according to the image signal of the next line continuously output from the data interface unit 1, and the liquid crystals. The shutter plate driver 3 drives the liquid crystal shutter plate of the next line to repeat the operation of constructing the screen of the next line, thereby constructing a screen of one frame.

When the screen configuration of one frame is completed as described above, the liquid crystal shutter plate driver 3 sequentially drives from the liquid crystal shutter plate of the first line again to repeat the screen of the next frame.

However, the above-mentioned OFFS is limited in the color of the light output from the LED, the color of the image that can be displayed is limited, it is very difficult to connect to each optical fiber is composed of a very dense array.

In addition, the light output from the LED must be effectively irradiated onto the Guam fiber, and the irradiated light is to be uniformly scattered throughout the optical fiber, which requires high technology.

That is, it is very difficult to scratch the optical fiber because it is necessary to scratch the optical fiber precisely in order to improve uniformity and maximum intensity of the scattered light.

In addition, since the light irradiated with the optical fiber is only partially used, the amount of light must be increased, but it is very difficult to increase the amount of light, and heat is generated due to the light lost at the light irradiation entrance of the optical fiber to which the light is irradiated. Should be dissipated.

The power consumed by one LED is about 60mW, and each pixel uses R, G, and B LEDs.

Therefore, when manufacturing the OFFS having a resolution of 1024 in the transverse direction, the power consumption is 1024 x 3 x 60 mW = 184 W, there is a problem that a lot of power is consumed.

Accordingly, an object of the present invention is to provide a flat panel display device which consumes less power and can be easily manufactured.

In order to achieve the above object, the flat panel display of the present invention displays an image by using an organic electroluminescent plate and a liquid crystal shutter plate.

The organic EL plate is formed by forming electrodes in the longitudinal direction, and operating by applying one line of video signals to the electrodes.

The liquid crystal shutter plate is formed to have an electrode extending in the lateral direction, and is positioned on the front surface of the organic EL plate, and the light generated while the organic EL plate is operated is operated one by one according to the image signal of the organic EL plate operating. Make the screens line by line.

1 is a driving circuit diagram of a conventional OFFS.

2 is a cross-sectional view showing a flat panel display of the present invention.

3 and 4 show electrodes formed on organic EL plates and liquid crystal shutter plates respectively used in the flat panel display of the present invention;

5 is a driving circuit diagram of a flat panel display of the present invention;

* Explanation of symbols for main parts of the drawings

10: organic EL plate 11, 21, 22: glass substrate

12 electrode 13 fluorescent layer

14, 23, 24: transparent electrode 15: moisture-proof protective glass

20: liquid crystal shutter plate 25: liquid crystal

30: data interface unit 40: organic EL plate driving unit

50: liquid crystal shutter plate driver

Hereinafter, the flat panel display of the present invention will be described in detail with reference to the accompanying drawings of FIGS. 2 to 5.

2 is a view showing a flat panel display of the present invention.

Here, reference numeral 10 denotes an organic EL plate operating in accordance with one line of video signal, and reference numeral 20 denotes a liquid crystal shutter plate installed on the front surface of the organic EL plate 10 and operating line by line.

In the organic EL plate 10, an opaque metal electrode 12 is formed on the entire glass substrate 11, and a fluorescent layer 13 is formed on an upper surface of the metal electrode 12.

The fluorescent layer 13 is used by mixing a dielectric material with, for example, a zinc sulfide-based phosphor.

As shown in FIG. 3, transparent electrodes 14 of R, G, and B are formed in the vertical direction on the upper surface of the fluorescent layer 13.

The transparent electrode 14 is formed using, for example, indium tin oxide (ITO).

And the moisture-proof protective glass 15 is affixed on the upper surface of the said transparent electrode 14.

Here, the metal electrode 12 is formed on the glass substrate 11, as shown in Figure 3, the transparent electrode 14 of R, G and B in the longitudinal direction, the transparent electrode 14 over the entire surface It may be formed.

The organic EL plate 10 includes a fluorescent layer 13 between the metal electrode 12 and the transparent electrode 14 and is formed of a capacitor, and a predetermined power source is supplied to the metal electrode 12 and the transparent electrode 14. When applied, the fluorescent layer 13 operates to output predetermined light.

Light output from the fluorescent layer 13 is output to the liquid crystal shutter plate 20 through the transparent electrode 14 and through the moisture-proof protective glass 15.

The liquid crystal shutter plate 20 forms transparent electrodes 23 and 24 on the glass substrates 21 and 22, and fills the liquid crystal 25 between the transparent electrodes 23 and 24.

The transparent electrode 23 is formed on the entire glass substrate 21, and the transparent electrode 24 is formed in the transverse direction while maintaining a predetermined interval therebetween as shown in Figure 4 or the transparent electrode 23 Are formed in the transverse direction while maintaining a constant interval therebetween, and the transparent electrode 23 is formed on the entire glass substrate 22.

In the liquid crystal shutter plate 20, when a predetermined power is applied between the transparent electrodes 23 and 24, the liquid crystals positioned between the transparent electrodes 23 and 24 are constantly arranged.

Therefore, light output from the organic EL plate 10 is output through the liquid crystal shutter plate 20.

5 is a driving circuit diagram of the flat panel display of the present invention. As shown in the drawing, a data interface unit 30 for interfacing an image signal input from a computer system or the like and a driving signal is output in accordance with the image signal output by the data interface unit 30 line by line to the organic EL. The organic EL plate driver 40 for operating the plate 10 and the transparent electrodes 23 and 24 of the liquid crystal shutter plate 20 according to the line of the image signal output by the data interface unit 30 are selectively selected. It consists of a liquid crystal shutter plate driver 50 for driving by applying power.

The drive circuit configured as described above inputs a predetermined video signal output from a computer system or the like to the organic EL plate driver 40 by one line by inputting the data interface unit 30.

The data interface unit 30 outputs a signal corresponding to a line of the image signal output to the organic EL plate driver 40 to the liquid crystal shutter plate driver 50.

Then, the organic EL plate driver 40 outputs one line of video signal to the metal electrode 12 and the transparent electrode 14 of the organic EL plate 10 so that the organic EL plate 10 is applied to one line of video signal. Will work accordingly.

The liquid crystal shutter plate driver 50 operates by selectively applying power to the transparent electrodes 23 and 24 of the liquid crystal shutter plate 20 in accordance with the line of the image signal for operating the organic EL plate 10.

Then, the liquid crystal 25 between the transparent electrodes 23 and 24 of the liquid crystal shutter plate 20 to which power is applied is made transparent, whereby the light output from the organic EL plate 10 is transferred to the liquid crystal shutter plate ( An image of one line is displayed through the transparent liquid crystal 25 of FIG. 10.

For example, when the organic EL plate 10 is operated in accordance with the image signal of the first line, the liquid crystal shutter plate 10 operates by applying power to the electrodes 23 and 24 of the first line. Light output from the plate 10 passes through the liquid crystal 25 positioned between the electrodes 23 and 24 of the first line of the liquid crystal shutter plate 10 to display an image of the first line.

By repeating this operation in accordance with the video signal of each line, an image of one frame can be displayed.

As described above, the present invention can be easily manufactured by displaying a predetermined image by using an organic EL plate and a liquid crystal shutter plate, and excellent in processability, and in the case of realizing a large screen, the electrode length is simply formed. It can manufacture.

Claims (7)

An organic EL plate formed in an elongated longitudinal direction and operating in accordance with a video signal of one line, and a liquid crystal shutter positioned in front of the organic EL plate and formed in a transverse direction and operated according to a line in which the organic EL plate operates A flat panel display device comprising: a plate. 2. The organic EL plate of claim 1, wherein an opaque metal electrode is formed on a glass substrate, a fluorescent layer is formed on an upper surface of the metal electrode, and a transparent electrode and a moisture proof protective glass are sequentially formed on an upper surface of the fluorescent layer. Flat display device characterized in that. The flat panel display of claim 2, wherein the metal electrode is formed on an entire surface thereof, and the transparent electrode is formed in a longitudinal direction. The flat panel display of claim 2, wherein the metal electrode is formed in a longitudinal direction, and the transparent electrode is formed on an entire surface thereof. The flat panel display according to claim 1, wherein each of the liquid crystal shutter plates has transparent electrodes formed on two glass substrates, and liquid crystal is filled between the transparent electrodes. The flat panel display of claim 5, wherein a transparent electrode is formed on an entire surface of the lower glass substrate, and a transparent electrode is formed on the upper glass substrate in a lateral direction. The flat panel display according to claim 5, wherein a transparent electrode is formed in the transverse direction on the lower glass substrate, and a transparent electrode is formed on the entire surface of the upper glass substrate.