KR970007806B1 - White balance control system for image output apparatus - Google Patents

Abstract

In a video output apparatus having a data memory device(10), for determining a DC level and an AC level with respect to R.G.B. signals outputted to a CRT(4) on the basis of control data stored in the data memory(10), the white balance adjusting system of the video output apparatus comprises a sensor(5) for detecting R.G.B. luminous data from the CRT(4), an operation processing unit(6) for computing and outputting relative value data on the basis of the R.G.B. luminous data outputted from the sensor(5), and a control data generating unit(40) for generating control data based on the relative data of the operation processing unit(6) and storing it in the data memory(10).

Description

Back Balance Adjustment System of Image Output Device

1 is a block diagram illustrating a conventional white balance adjustment method.

2 is a view for explaining a method of adjusting the back balance.

3 is a block diagram showing the configuration of an image output section of an image output apparatus to which the present invention is applied.

4 is a block diagram showing a back balance adjustment system of an image output apparatus according to an embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

4: CRT5: Sensor

6: calculation processing unit 10: data memory

20: image output unit 40: control data generating device

50: microprocessor 60: control data storage unit

70: interface circuit

The present invention relates to a back balance adjustment system that automatically adjusts a white balance of an image output apparatus such as a television receiver.

In general, in a color CRT tube used in an image output apparatus, the intensity of an electron beam is adjusted to match the luminous efficiency or color tone of red (R), green (G), and blue (B) three-color phosphors applied to the shadow mask. It is necessary to obtain a balance, because in the case of poor back balance, a predetermined chromaticity of RGB is colored, resulting in poor color reproducibility.

Therefore, in the related art, a high sensor and a low sensor are installed on a color CRT, a reference signal is input to the CRT, and light emission data is detected from the dark screen to the bright screen, and then R.G.B. The back balance is adjusted by adjusting the DC gain and the AC gain of the video output unit to which a signal is applied.

1 is a view for explaining a conventional method for adjusting the above-described back balance, in which reference numeral 1 denotes R.G.B. A video bias circuit that sets the DC level of the signal, 2 an image matrix circuit, 3 an amplification circuit for amplifying the AC level of the RGB signal, 4 a color CRT, and 5 a low sensor for outputting light emission data of a dark screen. 51, and a sensor unit having a high sensor 52 for outputting light emission data of a bright screen, and 6 outputs a relative value of RGB by executing a predetermined calculation process based on the light emission data applied from the sensor unit 5; It is an arithmetic processing unit.

Here, the calculation processing unit 6 calculates G / R and B / R based on when R is 100, for example, and outputs the resulting data. For example, when light emission data of R: 200, G: 190, and B: 210 is input from the sensor unit 5 (low sensor 51 or high sensor 52), the calculation processing unit is R: G / R: B / R is calculated to output relative data of 100: 95: 105.

Then, in the TV production process, the person in charge of adjusting the color CRT is responsible for the R.G.B. of the image bias circuit 1 and the amplification circuit 3 based on the data. The back balance is adjusted by repeating the operation of varying each gain according to the signal.

2 shows R.G.B. Figure 2 shows the characteristic curve of the output. The output is shown, and FIG. 2B adjusts the image bias circuit 1 based on the light emission data from the row sensor 51 to adjust the R.G.B. The DC level of the signal, i.e., the cutoff voltage, is adjusted. FIG. 2C adjusts the DC level in this manner and then amplifies the circuit 3 based on the light emission data from the high sensor 52. FIG. RGB by adjusting the gain of Since the state of adjusting the AC level of the signal is shown, color reproducibility can be improved by adjusting the same color temperature from the dark screen to the bright screen in this way.

However, in the above method, the productivity of the back balance adjustment is dependent on the manual operation of the adjuster, resulting in poor productivity. In particular, there is a problem in the reliability of the product because the adjustment density varies depending on the capability of the adjuster.

Accordingly, the present invention has been made in view of the above circumstances, and an object thereof is to provide a series of back balance adjustment systems for color CRTs in a TV production process.

A back balance adjustment system of an image output apparatus according to the present invention for realizing the above object comprises a data memory and is outputted to a CRT based on control data stored in the data memory. An image output apparatus configured to set a DC level and an AC level for a signal, wherein the R.G.B. Calculation processing means for calculating and outputting relative value data based on light emission data; and control data generating means for generating control data based on the relative value data by the calculation processing means and storing the control data in the data memory. It is done.

According to the present invention having the above-described configuration, the control data generating means is based on the relative value data by the arithmetic processing means. The back balance is automatically adjusted by repeating a series of back balance adjustment processes for generating control data for setting AC and DC levels for signals and storing them in the data memory 10 in the image output apparatus.

Hereinafter, an embodiment according to the present invention will be described with reference to the drawings.

Before explaining the present invention, the configuration of the image output unit of the image output apparatus to which the present invention is applied will be described.

3 is a block diagram showing a configuration of an image output unit 20 of a general image output apparatus. In the drawing, reference numeral 1 denotes a demultiplexer for multiplexing a chroma input, and 2 to 4 denote the demultiplexer 1. The D / A converter 5 converts the color difference signal (RY, BY) data and the luminance (Y) input output from the analog signal into an analog signal, and 5 represents the DC level of the color difference signal applied from the D / A converters (2, 3). The image bias circuit to be set, 6 is RGB based on the input color difference signal (RY, BY) Image matrix circuits for generating a signal, 7 to 9, are R.G.B. An amplifier that amplifies the AC level of a signal.

Reference numeral 10 denotes a data memory, which stores chroma synchronization data related to the operation of the demultiplexer 1 and data for setting the DC and AC levels of the image bias circuit 5 and the amplifiers 7 to 9. Will be. This data is then set to a microprocessor (not shown) in the initial state of supplying the operating power to the image output apparatus.

Reference numeral 11 denotes a D / A converter for converting the DC level control data output from the data memory 10 into an analog control signal.

In the above configuration, the microprocessor sets predetermined control data in the data memory 10 at the time of initial operation, and the control data is transferred to the amplifier of the image bias circuit 5 through the D / A converter 11. RGB applied to 7 ~ 9) Since the DC level and the AC level for the signal are determined, the main object of the present invention is to automatically obtain control data with a back balance adjusted for setting in the data memory 10.

4 is a block diagram showing a back balance adjustment system of an image output apparatus according to an embodiment of the present invention. In FIG. 4, the same parts as in FIGS. 1 and 3 are denoted by the same reference numerals, and detailed description thereof will be omitted. .

40 in FIG. 4 shows the R.G.B. A control data generation device for generating control data for setting DC and AC levels for a signal, which is applied to the R.G.B. Read and output predetermined control data from the data memory 42 according to the relative value applied from the data processing section 42 and the calculation processing section 6 in which predetermined control data with respect to the relative value of the light emission data is stored. It is configured to include a microcomputer 41.

Reference numeral 50 denotes a microprocessor provided in the image output apparatus, and 60 denotes an R.G.B. The control data storage unit stores the DC and AC level control data for the signal, that is, data stored in the data memory 10. Reference numeral 70 denotes an interface circuit for transmitting and receiving data between the control data generating device 40 and the microprocessor 50, the control data storage unit 60, and the image output unit 20.

In the above configuration, the microcomputer 41 of the control data generating device 40 is transferred from the arithmetic processing section 6 to the R.G.B. When the relative value data of the intensity is applied, it is first determined whether the relative value data is a predetermined value, for example, R: G: B = 100: 100: 100, and when it is out of the predetermined value, the data memory 42 is accessed based on this. After reading the control data, the control data is stored in the data memory 10 of the image output unit 20 through the interface circuit 70.

Then, the above operation is repeated to output the R.G.B. When the light emission data reaches a predetermined value, the back balance adjustment operation is stopped, and the control data at that time is stored in the control data storage unit 60 through the interface.

On the other hand, when the above adjustment is completed, the sensor unit 5, the calculation processing unit 6 and the control data generating device 40 in FIG. 4 stops the operation, and when the power is supplied to the image output device, the microprocessor 50 reads the control data stored in the control data storage unit 60 and stores the control data in the data memory 10 of the image output unit 20 so that the RGB in the state of the back balance is adjusted. Will output a signal.

Therefore, according to the embodiment, the back balance adjustment for the CRT 4 can be executed automatically.

As described above, according to the present invention, it is possible to realize a back balance adjustment system of an image output apparatus which can improve productivity and product reliability by automatically executing a series of back balance adjustments for the image output apparatus. .

In addition, this invention is not limited to the said Example, It can variously deform and implement within the range which does not deviate from the technical summary of this invention.

Claims (3)

R.G.B. having a data memory 10 and outputted to the CRT 4 based on control data stored in the data memory 10. An image output apparatus configured to set a DC level and an AC level for a signal, wherein the C. 4 outputs an R.G.B. Sensor means (5) for detecting luminescence data, and R.G.B. Control processing means 6 for calculating and outputting relative value data on the basis of light emission data and control for generating control data based on the relative value data by the processing means 6 and storing it in the data memory 10. And a data generating means (40). The control data generating means (40) according to claim 1, wherein the control data generating means (40) stores the control data in accordance with the relative value data and the relative value data applied from the arithmetic processing section (6). And a microcomputer (41) for reading out and outputting control data from the data memory (42). 3. An image output apparatus according to claim 1 or 2, wherein the image output apparatus is R.G.B. A control data storage unit 60 for storing control data for generating DC and AC levels of a signal, and control data stored in the control data storage unit 60 when the device is turned on in the data memory 10; And a microprocessor 50, wherein the control data generating means 40 stores the control data in which the adjustment is completed, in the control data storage unit 60. .