KR0170639B1 - Circuit and method for controlling screen state according to brightness around and screen brightness - Google Patents

Abstract

The present invention relates to a screen state control circuit and a method according to the ambient brightness and screen brightness to control the image data according to the brightness around the television and the brightness and darkness of the screen to always maintain the optimal screen state.

That is, the present invention not only controls the image data according to the CRT brightness but also controls the image data according to the change of the surrounding environment so as to control the image data so that it is the best screen depending on whether the current screen is bright or dark. It is to maintain the state.

Description

Screen condition control circuit and method according to ambient brightness and screen brightness

1 is a circuit diagram showing an embodiment of a screen state control circuit according to the ambient brightness and the screen brightness according to the present invention.

2 is a flowchart for performing a method for adjusting a screen state according to ambient brightness and screen brightness according to the present invention.

3 is a level relationship graph according to ab1 input.

4 is a level relationship graph according to ambient brightness.

* Explanation of symbols for main parts of the drawings

1 antenna 10 tuner

20: intermediate frequency amplifier 30: intermediate frequency detector

40: signal signal processing unit 41: contrast control unit

42: sharpness control unit 43: brightness control unit

50: color signal processing unit 60: synchronous detection unit

70: deflection circuit 71, 72: vertical, horizontal deflection

80: ABL circuit 90: matrix circuit

100: ambient light sensor 110: memory

ADC1: analog digital converter 111, 112: first and second memory sections

MICOM: micom m1 ~ mn, M1 ~ MN: memory terminal

SP1: Ambient brightness sensor input value terminal ap1: ab1 terminal

The present invention relates to a television (hereinafter referred to as a TV), and more particularly, according to an ambient brightness and a screen brightness that maintain an optimal screen state by controlling image data according to the brightness around the TV and the brightness and darkness of the screen. Screen state control circuit and method.

In general, image data, such as color, contrast, brightness, tint, sharpness, etc., which determine the screen state set by a user in a TV, It does not change unless you adjust it again.

Therefore, even if the brightness around the TV changes due to weather changes or other enzymes, the TV screen state is always optimal because the TV screen state does not actively cope with the change in ambient brightness unless the user changes the image data, which is a factor that determines the screen state. It was not possible to maintain the screen state of.

The present invention is to solve this problem, an object of the present invention is to detect the brightness of the current screen using the automatic brightness limit (hereinafter referred to as ABL) circuit and the ambient brightness using the ambient brightness sensor The present invention aims to provide a screen state control circuit and a method according to the ambient light and the screen brightness to detect and display the best image data according to the screen brightness and the surrounding environment so that the TV screen state is always maintained at the best.

A feature of the present invention for achieving this object is a tuner for converting a high frequency signal input through an antenna into an intermediate frequency signal and an intermediate frequency amplifier for amplifying the intermediate frequency signal output from the tuner and the intermediate frequency amplifier. An intermediate frequency detector for detecting an intermediate frequency signal from the intermediate frequency signal, a luminance signal and color signal processor for processing luminance signals and color signals from the intermediate frequency detector, and a horizontal and vertical signal connected to the intermediate frequency detector A synchronization circuit for detecting synchronization, a deflection circuit for horizontal and vertical deflection in accordance with the synchronization detection of the synchronization detection unit, an ABL circuit connected to the deflection circuit and the luminance circuit processing unit for controlling a current beam applied to a CRT, and the luminance; An image processing system having a matrix circuit connected to a signal and a color signal processor, the method comprising: sensing brightness around a screen An ambient brightness sensor, an analog digital converter connected to the ambient brightness sensor and converting the output of the ambient brightness sensor into a digital value, and a plurality of screen brightness state values and ambient brightness states according to the screen brightness state A memory unit in which a plurality of screen ambient brightness state values are stored, and connected to the memory unit and the ABL circuit and an analog digital converter to display the screen state and the screen state from the ABL circuit and the analog digital converter. And a screen state control circuit according to the ambient brightness and the screen brightness, which are provided as a microcomputer for determining the brightness state around the screen and extracting and outputting an image data value from the memory to maintain an optimal screen state.

According to another aspect of the present invention, a general microcomputer routine is performed to determine the level of the ABL value input through the ab1 terminal of the microcomputer, and to retrieve the corresponding image data from the memory unit and store the image data in the data buffer. Determining the level of the ambient brightness value from the ambient brightness sensor inputted through the ambient brightness sensor value input terminal, and extracting the corresponding image data from the header and storing the image data in the data buffer. The present invention relates to a method for adjusting a screen state according to ambient brightness and screen brightness to perform a step of outputting a value capable of maintaining an optimal screen state by using image data values stored in a data buffer.

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

1 shows a screen state control circuit according to the ambient brightness and the screen brightness according to the present invention. The tuner 10 converts a high frequency signal input through the antenna 1 into an intermediate frequency signal IF and outputs the same. The intermediate frequency amplifier 20 amplifies the intermediate frequency signal output from the tuner 10.

The intermediate frequency amplifier 20 is connected to an intermediate frequency detector 30 that detects an intermediate frequency signal and outputs an image signal. The intermediate frequency amplifier 30 is connected to the intermediate frequency detector 30 from the intermediate frequency detector 30. The luminance signal processor 40 and the color signal processor 50 for dividing the image signal into a luminance signal and a color signal are processed.

The luminance signal processor 40 includes a contrast controller 41, a sharpness controller 42, and a brightness controller 43, and the color signal processor 50 includes a color controller 51 and a tint controller 52. do.

In addition, the intermediate frequency detector 30 is connected with a synchronization detector 60 for detecting horizontal and vertical synchronization, and the synchronization detector 60 is vertically deflected horizontally and vertically according to the synchronization detection of the synchronization detector 60. The deflection circuit 70 which becomes the deflection part 71 and the horizontal deflection part 72 is connected.

A current beam for a luminance signal applied to a cathode ray tube (hereinafter referred to as a CRT) is applied to the brightness control unit 43 of the luminance signal processing unit 40 and the horizontal deflection unit 72 of the deflection circuit 70. The ABL circuit 80 controls the screen brightness while controlling the CRT, and a matrix circuit 90 is connected to the luminance signal and color signal processing units 40 and 50 to provide a luminance signal and a color signal. Output to the CRT in combination.

On the other hand, the ambient brightness sensor 100 for detecting the brightness around the screen is connected to the analog digital converter (ADC1) for converting the output of the ambient brightness sensor 100 to a digital value, the screen brightness according to the screen brightness A microcomputer (MICOM) is connected to the memory unit 110 and the analog digital converter ADC1 and the ABL circuit 80, which store the screen brightness value according to the state value and the screen ambient brightness state.

The microcomputer MICOM determines the screen state and the ambient brightness state according to the input of the screen state and the ambient brightness state from the ABL circuit 80 and the analog digital converter ADC1 to determine an optimal state from the memory unit 110. A video data value for maintaining the screen state is extracted and output to the luminance signal and color signal processing units 40 and 50, and the memory unit 110 stores the screen brightness state values of a plurality of cases according to the screen brightness state. A first memory unit 111 comprising a plurality of memory elements M1 to MN, and a plurality of memory elements m1 to mn storing screen brightness values in a plurality of cases according to screen brightness conditions. The second memory unit 112 is configured.

2 is a flowchart for performing a method for adjusting a screen state according to the ambient brightness and the screen brightness according to the present invention. The general microcom routine is performed to determine the level of the ABL value input through the ab1 terminal ab1 of the microcomputer. The corresponding image data is extracted from the memory elements M1 to MN of the memory unit 110 and stored in the data buffer A (not shown) (S10), and the ambient brightness sensor value input terminal of the microcomputer ( A data buffer (not shown) is determined by determining the level of the ambient brightness value from the ambient brightness sensor 100 inputted through SP1 and extracting the corresponding image data from the memory elements m1 to mn of the memory unit 110. The data buffers (A) and (B) may be buffers inside the MICOM or may use an external memory.

After the step (S20), in step (S10), (S20) by calculating the image data value stored in the data buffer (A), (B) to obtain a value that can maintain the optimal screen state brightness signal processor ( 40 and outputting to the color signal processor 50 (S20).

In the present invention as described above, the high frequency signal input through the antenna 1 is converted into an intermediate frequency signal by the tuner 10 and input to the intermediate frequency amplifier 20 to be amplified and output.

The amplified intermediate frequency signal is input to the intermediate frequency detector 30, detected, and output as an image signal.

The video signal is input to the luminance signal processor 40, the color signal processor 50, and the synchronization detector 60, and the image signal output from the luminance signal processor 40 and the color signal processor 50 is the matrix circuit 90. Is applied to the CRT.

On the other hand, the synchronous detection unit 60 detects vertical and horizontal synchronization and is applied to the vertical deflection unit 71 and the horizontal deflection unit 72 to vertical and horizontal deflection, and the brightness control unit of the luminance signal processing unit 40 It is input to the ABL circuit 80 with the output of 43).

The ABL circuit 80 transmits information on the screen brightness to the microcomputer MICOM through the ab1 terminal ab1 of the microcomputer in accordance with the signal level applied from the horizontal deflection unit 72 and the brightness control unit 43.

In addition, the ambient brightness sensor 100 detects the ambient brightness and converts the value to digital through an analog digital converter (ADC1) and transmits it to the MICOM through the ambient light sensor value input terminal SP1 of the microcomputer. do.

Accordingly, the microcomputer MICOM stores the image data corresponding to the ambient brightness and the screen state input through the ab1 terminal ab1 and the ambient light sensor value input terminal SP1, and the memory devices m1 to mn and M1. Read from MN) and calculate these to control each control terminal of the microcomputer, namely contrast control terminal C1, sharpness control terminal S, brightness control terminal B, color control terminal C and tint control. The luminance signal processor 40 and the color signal processor 50 are controlled through the terminal T to control the screen state to an optimal state.

Meanwhile, the screen state control process of the MICOM is as follows.

First, the microcomputer MICOM determines the level of the ABL value input through the ab1 terminal ap1 (S11), and reads the corresponding image data from the memory devices M1 to MN and stores it in the data buffer A. FIG. (S12), in which the ab1 input is equal to the third diagram of the level.

Then, the level of the ambient brightness value inputted through the ambient brightness sensor value input terminal SP1 is determined (S21), and image data corresponding thereto is read from the memory elements m1 to (mn) to the data buffer B. In operation S22, the relationship between the input of the ambient light sensor and the level is as shown in FIG. 4.

Then, the image data values of the data buffers (A) and (B) are calculated to obtain image data values that can produce an optimal screen state. The contrast control terminal C1, the sharpness control terminal S, and the brightness control terminal B), through the color control terminal C and the tint control terminal T, the image data value obtained by the operation of the MICOM is output and the screen state is controlled to be the optimal state (S30). The condition is adjusted to be the best.

As described above, the present invention not only controls the image data according to the CRT brightness but also controls the image data according to the change of the surrounding environment to become the optimal screen state according to the bright and dark of the current screen and the bright and dark of the surrounding environment. By doing so, it has the effect of always maintaining the best screen condition.

Claims (2)

The intermediate frequency amplifier 20 and the dual inter-frequency amplifier amplify the intermediate frequency signal output from the tuner 10 to the tuner 10 that converts and outputs the high frequency signal input through the antenna 1 into the intermediate frequency signal. An intermediate frequency detector 30 for detecting an intermediate frequency signal from the unit 20 to obtain an image signal, and a luminance signal and color signal processor 40 for processing luminance signals and color signals from the intermediate frequency detector 30. And a synchronization circuit 60 connected to the intermediate frequency detector 30 to detect horizontal and vertical synchronization, and a deflection circuit 70 for horizontal and vertical deflection in accordance with the synchronization detection of the synchronization detector 60. ) And an ABL circuit 80 connected to the deflection circuit 70 and the luminance signal processing unit 40 to control a current beam applied to the CRT, and a matrix circuit connected to the luminance signal and color signal processing units 40 and 50. An image processing system having a 90, wherein the brightness around the screen is bright. Ambient brightness sensor 100 for detecting a, and the analog brightness converter (ADC1) connected to the ambient brightness sensor 100 to convert the output of the ambient brightness sensor 100 to a digital value, and the screen brightness state A memory unit 110 in which a plurality of screen brightness state values and a plurality of screen brightness state values according to the ambient light state are stored, the memory unit 110 and the ABL circuit 80, and an analog digital converter ( Connected to the ADC1) to determine the screen state and the ambient brightness state according to the screen state and the ambient brightness state input from the ABL circuit 80 and the analog digital converter ADC1 to determine an optimal screen from the memory unit 110. Screen condition control circuit according to the ambient brightness and screen brightness provided by the MICOM (MICOM) for extracting and outputting the image data value that can maintain the state. After performing a general micom routine, determining the level of the ABL value input through the ab1 terminal ap1 of the MICOM, and extracting the corresponding image data from the memory unit 110 and storing it in the data buffer A. (S10), and determines the level of the ambient brightness value from the ambient brightness sensor 100 input through the ambient brightness sensor value input terminal SP1 of the MICOM (MICOM) and stores the image data corresponding thereto. Performing the step S20 of retrieving from the unit 110 and storing the data in the data buffer B, using the image data values stored in the data buffers A and B in steps S10 and S20. Method of adjusting the screen state according to the ambient brightness and the screen brightness to perform the step (S30) to output a value that can maintain the optimal screen state.