KR19990019755A - Screen Adjustment System of Liquid Crystal Display System - Google Patents

Abstract

The present invention relates to a screen adjusting apparatus for improving image quality in a liquid crystal display system by displaying a driving waveform of a liquid crystal panel simultaneously with an image signal on a screen to easily perform screen adjustment. Selects and mixes an input processing unit that performs Y / C separation, color difference signal demodulation, and RGB decoding, and an image signal processed and output by the input processing unit and a specific OSD (On Screen Display) signal to be displayed on the screen A signal synthesizing unit that outputs an RGB signal and an image signal output from the signal synthesizing unit are separated into driving signals of R, G and B, and the screen adjustment is performed. The control unit and the control signal for the operation to the input processing unit and the RGB processing unit in accordance with the adjustment signal input from the outside by the user At the same time, a microcomputer for inputting OSD data to the signal synthesizing unit and a control signal for inputting the microcontroller to the RGB processing unit at the same time. It characterized in that it comprises a conversion unit.

Description

Screen Adjustment System of Liquid Crystal Display System

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a screen adjustment device applied to improve image quality in a liquid crystal display system. In particular, a liquid crystal display system which displays a driving waveform of a liquid crystal panel on a screen simultaneously with an image signal to easily perform screen adjustment. Relates to a screen adjustment device.

In general, a liquid crystal display (LCD) system does not have the characteristics of a liquid crystal panel as compared to a cathode ray tube (CRT) display system, but the characteristics of a light source and an RGB separation unit have poor brightness and white balance. A separate device is needed. At this time, the screen adjustment is made for contrast, brightness, and gamma, and each of them has to be adjusted differently for the variables because the RGB characteristics are different optically.

Therefore, the screen is adjusted again when the actual image signal is inputted according to a certain pattern screen. However, when the fine adjustment for each variable is performed, a problem arises in that it is not possible to confirm the change width thereof.

1 is a block diagram showing the configuration of a screen adjusting device applied to a liquid crystal display (LCD) system according to the prior art.

Referring to FIG. 1, a control unit 110 controlling an operation of a system according to an input image signal, a signal processing unit 120 converting the image signal into a signal for display, and a conversion in the signal processing unit 120. An image display unit 130 for displaying the received signal, an LCD driver circuit unit 140 for determining the operation of the image display unit 130 according to a control signal of the controller 110, and an output from the LCD driver circuit unit 140 An oscilloscope 150 for displaying a driving waveform to be displayed, and a screen visually displayed by the image display unit 130 and the oscilloscope 150 to visually determine a user to input a screen adjustment signal to the controller 110. Adjustment signal input unit 160 is included.

The image display unit 130 may use a front projection type liquid crystal display device, a rear projection type liquid crystal display device or a liquid crystal display device using a backlight.

In the conventional configuration as described above, the user sees and judges the screen displayed on the image display unit 130 and the oscilloscope 150 and inputs a screen adjustment signal. Problem occurs.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to display a video signal using a sub picture function (PIP) and simultaneously display the change components of the adjustment signal to perform a simple and easy screen adjustment. The present invention provides a device for adjusting a screen of a liquid crystal display system.

1 is a block diagram showing the configuration of a screen adjusting apparatus according to the prior art;

2 is a block diagram showing the configuration of a screen adjusting apparatus according to the present invention;

3 is a block diagram showing the configuration of a screen adjustment converter according to the present invention;

4 is a view showing a first example of a parameter applied to the present invention;

5 is a view showing a second example of a parameter applied to the present invention;

6 shows an example of a screen finally displayed by the present invention.

* Explanation of symbols for the main parts of the drawings

210: input processing unit 220: signal synthesizing unit

230: liquid crystal drive unit 240: RGB processing unit

250: microcomputer 260: screen adjustment conversion unit

261: parameter adjusting unit 262: ROM

263: adjustment signal processing unit 264: RAM

265 waveform control unit 266 graphic processing unit

270: LCD

According to a first aspect of the present invention for achieving the above object, an input processing unit for performing the operation of Y / C separation, color difference signal demodulation, RGB decoding by selecting an image signal input from the outside, and in the input processing unit A signal synthesizer which mixes the processed video signal and a specific OSD (On Screen Display) signal to be displayed on the screen, and outputs the RGB signal, and the video signal output from the signal combiner is R, G, B Control signal for operation of the RGB processor for outputting to the liquid crystal driver of each of R, G, and B after separating the driving signal and adjusting the screen, and the input processor and the RGB processor according to the adjustment signal input from the outside by the user. Simultaneously input a microcomputer to input OSD data to the signal synthesizing unit and an adjustment signal input from the microcomputer to the RGB processing unit. Converting the pollen to a graphic signal, and provides the screen adjustment of the liquid crystal display system comprising a display device for conversion to adjust the output to the microcomputer to be used as OSD data.

According to a second aspect of the present invention, the screen adjustment converting unit includes a parameter adjusting unit storing a change range of each parameter for the adjustment signal, and a ROM storing a basic waveform for each parameter. And an adjustment signal processor for outputting data of each parameter according to the adjustment signal output from the microcomputer, a RAM for storing data output from the adjustment signal processor, and a basic waveform for a specific parameter. A waveform adjusting unit which receives the change width from the parameter adjusting unit according to the data stored in the RAM and calculates the data of the actually adjusted waveform, and converts the data calculated by the waveform adjusting unit into graphic data and inputs it to the microcomputer. It includes a graphics processing unit to make.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail.

FIG. 2 is a block diagram showing the configuration applied to the liquid crystal display system according to the present invention, and FIG. 3 is a block diagram showing the configuration of the screen adjustment converter shown in FIG.

Referring to FIG. 2, an input processor 210 that selects an externally input video signal to perform Y / C separation, color difference signal demodulation, and RGB decoding, and an image signal output from the input processor 210; The signal synthesizer 220 which mixes a specific OSD signal to be output on the screen and outputs it as an RGB signal, and separates the image signal output from the signal combiner 220 into driving signals of R, G, and B an RGB processor 240 for performing screen adjustment on contrast, brightness, and gamma, and then outputting to the liquid crystal driver 230 of R, G, and B, and externally inputted by the user. A microcomputer 250 for inputting control data for an operation to the input processor 210 and the RGB processor 240 according to an adjustment signal, and inputting OSD data to the signal synthesizer 220 and the microcomputer 250. Simultaneous control signals input from the RGB processor 240 to the The input received convert change of the waveform adjusting signal to the graphic signal to be used as OSD data, and a screen adjustment conversion section 260 to output to the microcomputer 250.

In FIG. 2, reference numeral 270 denotes an LCD of RGB for receiving a signal output from the liquid crystal driver 230 of R, G, and B to display a final image signal.

Referring to FIG. 3, the screen adjustment converting unit 260 stores a parameter adjusting unit 261 storing a change width of each parameter with respect to the adjustment signal, and a basic waveform for each parameter. ROM (262), an adjustment signal processing unit 263 for outputting data by finding the address where each parameter is stored according to the adjustment signal output from the microcomputer 250, and output from the adjustment signal processing unit 263 RAM (264) for storing the data of a specific address, and the parameter adjusting unit (261) in accordance with the data stored in the RAM (264) to retrieve a basic waveform from the ROM (262) for a specific parameter A waveform adjusting unit 265 that receives the change width from the waveform and calculates data of the actually adjusted waveform, and a graphic processing unit for converting the data calculated by the waveform adjusting unit 265 into graphic data and inputting it to the microcomputer 250. And a unit (266).

The operation of the present invention configured as described above is as follows.

First, the input processor 210 selects an externally input video signal, performs Y / C separation, color difference signal demodulation, and RGB decoding, and then outputs the signal to the signal synthesizer 220. In this case, the microcomputer 250 inputs a control signal to the input processor 210 and the RGB processor 240 to perform signal processing.

When the signal synthesizer 220 mixes an image signal output from the input processor 210 and a specific OSD signal to be output on the screen output from the microcomputer 250 and outputs the RGB signal as the RGB signal, the RGB processor 240 In the first embodiment, the video signal output from the signal synthesizer 220 is divided into driving signals of R, G, and B, and the screen adjustment is performed on contrast, brightness, and gamma. And B are output to each of the liquid crystal drivers 230. In this case, the signal passing through the liquid crystal driver 230 is displayed as the final image signal on the LCD 270.

Meanwhile, while the above operation is performed, the screen adjustment converter 260 simultaneously receives an adjustment signal input from the microcomputer 250 to the RGB processor 240 and converts a change in the adjustment signal waveform into a graphic signal to display the OSD. Output to the microcomputer 250 to be used as data.

The operation of the screen adjustment converter 260 is as follows.

The parameter adjusting unit 261 stores a variation range of each parameter with respect to the adjustment signal in advance, and a basic waveform for each parameter is stored in the ROM 262. At this time, the input parameter uses Y, R-Y, B-Y, etc. as shown in FIG. The input parameters Y, R-Y, and B-Y are decoded into signals of B, G, and R according to the demodulation angle. The change components are measured in advance and stored in the parameter adjusting unit 261.

Meanwhile, each parameter may use contrast, bright, and gamma as shown in FIG. 5 without using Y, RY, and BY, and is adjusted in the same manner as in FIG. 4. The change width of the signal is measured in advance and stored in the parameter adjusting unit 261.

Thereafter, when the adjustment signal processor 263 finds the address where each parameter is stored according to the adjustment signal from the microcomputer 250 and outputs data, the RAM 264 outputs the adjustment signal processor 263. Save data of specific address.

Thereafter, the waveform adjusting unit 265 retrieves a basic waveform from the ROM 262 for a specific parameter, receives a change width from the parameter adjusting unit 261 according to data stored in the RAM 264, and adjusts the actual waveform. When the data of the waveform to be calculated is calculated, the graphic processing unit 266 converts the data calculated by the waveform adjusting unit 265 into graphic data and inputs it to the microcomputer 250.

At this time, the microcomputer 250 outputs the graphic signal as the OSD data to the signal synthesizing unit 220 in accordance with a synchronization signal (sync) to display the desired portion of the screen.

As a result, in the present invention, as shown in FIG. 6, the process of changing the waveform characteristic added to the LCD at a specific position according to external adjustment is displayed on the final displayed screen regardless of the image signal.

As described above, the screen adjusting apparatus of the liquid crystal display system of the present invention displays the process of changing the waveform characteristics added to the LCD according to the adjustment signal individually for each parameter so that the screen adjusting operation is simple and easy. There is an effect to be performed.

Claims (2)

An input processing unit which selects an externally input video signal to perform Y / C separation, color difference signal demodulation, and RGB decoding, and an image signal processed and output by the input processing unit and a specific OSD to be displayed on the screen. Screen Display) The signal synthesizer that mixes the signals and outputs them as RGB signals, and separates the video signal output from the signal synthesizer into driving signals of R, G, and B and adjusts the screens, respectively. An RGB processor for outputting to the liquid crystal driver of the LCD; Simultaneously receive the adjustment signal input from the microcomputer to the RGB processor and convert the change of the signal waveform into a graphic signal to be used as OSD data. Screen Control device of a liquid crystal display system, characterized by comprising a screen for outputting the adjusted conversion yikeom. The apparatus of claim 1, wherein the screen adjustment converter comprises: a parameter adjusting unit storing a change width of each parameter of the adjustment signal; a ROM storing a basic waveform of each parameter; An adjustment signal processor for outputting data of each parameter according to an adjustment signal output from the microcomputer, a RAM for storing data output from the adjustment signal processor, and a basic waveform for a specific parameter from the ROM A waveform adjusting unit which receives the change width from the parameter adjusting unit according to the data stored in the RAM, and calculates data of the actually adjusted waveform; and a graphic processing unit which converts the data calculated by the waveform adjusting unit into graphic data and inputs it to the microcomputer. Screen adjustment apparatus of the liquid crystal display system comprising a.