KR940013182A - Brightness and gradation correction circuit of cathode ray tube display device - Google Patents

Abstract

The present invention relates to a luminance and gradation correction circuit of a cathode ray tube display device using a dynamic focus signal, and comprises a video signal amplifier, a luminance and gradation correction means, a luminance signal output unit, and an image signal output unit. The gradation can be corrected at the same time. Accordingly, in the large-screen display device, uniform luminance and gradation signals appear at the center as well as the edge of the screen, thereby obtaining clear image quality. The present invention can also be used in cathode ray tube display devices or general display devices, and is particularly useful for large screen displays or flat screens.

Description

Brightness and gradation correction circuit of cathode ray tube display device

As this is a public information case, the full text was not included.

1 is a block diagram showing an embodiment according to a luminance and gray scale correction circuit of a cathode ray tube display device according to the present invention;

2 is a detailed circuit diagram according to FIG. 1;

3 is a cross-sectional view of the cathode ray tube without dynamic focusing,

(A) and (b) of FIG. 4 are characteristic charts showing the state before and after the correction of the luminance and the gradation signal;

5 is a waveform diagram showing an input state of a dynamic focus signal according to FIG.

(A) to (d) of FIG. 6 are waveform diagrams according to (a) and (b) of FIG.

Claims (2)

A video signal amplifier 70 for amplifying the video signal input from the video signal input terminal 71, brightness and gradation correction means A for performing brightness and gradation correction, and the brightness and gradation correction means A; A luminance signal output unit 60 for receiving the luminance and gray level correction signals outputted from the image signal and combining the image signal with the image signal and outputting them to the image signal output unit 80, the image signal amplifying unit 70 and the luminance signal output unit 60 A luminance and gray level correction circuit of a cathode ray tube display device comprising an image signal output unit 80 applied as an input to a cathode end of the cathode ray tube 90; The luminance and gradation correction means (A) generates and outputs an appropriate luminance and gradation correction signal using the dynamic focus signal input from the dynamic focus signal input terminal (11), and outputs the gradation correction signal to the gradation correction signal synthesis unit. Outputs to the image signal amplifier 70 through the 30B, and synthesizes the external luminance adjustment signal inputted from the external luminance adjustment signal input terminal 31, the luminance correction signal, and the reference luminance signal to the luminance signal output unit 60. And a luminance and gray level correction circuit of the cathode ray tube display apparatus. The dynamic focus signal input unit of claim 1, wherein the brightness and gradation correction means A receives the dynamic focus signal from the dynamic focus signal input terminal 11 and outputs the dynamic focus signal to the brightness and gradation correction signal generator 20. 10; A luminance and gradation correction signal generator 20 which receives a signal output from the dynamic focus signal input unit 10 and generates an appropriate luminance and gradation correction signal; A gray level complementary signal synthesizing unit 30B for synthesizing the gray level correcting signal output from the brightness and gray level correcting signal generator 20 and applying it to the image signal amplifying unit 70; The luminance correction signal output from the luminance and gradation correction signal generator 20, the external luminance adjustment signal input from the external luminance adjustment signal input terminal 31, and the reference luminance adjustment output from the reference luminance signal adjustment unit 40. A luminance signal synthesizing section 30A for synthesizing the signals; And a luminance signal amplifying circuit (50) of the cathode ray tube display device, comprising a luminance signal amplifying unit (50) for receiving and amplifying the synthesized signal output from the luminance signal combining unit (30A) and outputting the amplified signal to the luminance signal output unit (60). ※ Note: The disclosure is based on the initial application.