JPH1084553A - White balance adjustment device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a white balance adjustment device in which proper white balance adjustment is attained without replacing components such as a ROM at the adjustment. SOLUTION: This white balance adjustment device 30 adjusts a white balance of a plasma display device 20, in which an RGB signal is given to a video processing circuit 2 consisting of a gamma correction circuit 21 or the like where gamma correction or the like is conducted based on a correction pattern stored in a correction pattern storage memory 1 and the resulting signal is fed to a plasma display panel(PDP) 4 via a PDP drive circuit 3 for the display. The plasma display device 20 is provided with a communication means 6 and its correction pattern storage memory is made up of a rewritable memory. On the other hand, a chromaticity measurement device 7 that measures chromaticity of the PDP and a correction pattern write device 8 consisting of a correction pattern generating section 9 that generates a correction pattern for the white balance corresponding to the measurement result and of a transfer means 10 transferring the correction pattern to the plasma display device 20 are provided to the outside of the device 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a white balance adjusting device, and more particularly to an adjusting device for a plasma display device.

[0002]

2. Description of the Related Art Conventionally, white balance adjustment of a display device has been performed by adjusting the level of an analog signal. However, when an analog signal is passed through an analog circuit, there is a problem that S / N is deteriorated. In this technology, it has been practically used to perform image processing and adjust a digital signal obtained by A / D converting an analog signal. FIG. 4 shows an image output unit of a plasma display device using a PDP, and a correction pattern storage unit 1 for storing a white balance correction pattern.
A gamma correction circuit 21 for performing gamma correction based on the correction pattern stored in the correction pattern storage unit 1, and a video processing circuit 2 configured with an adjustment circuit 22 for adjusting color density, color tone, and the like.
And a PDP drive circuit 3 for driving a PDP (plasma display panel) 4, the PDP 4, and a control unit 5 for controlling each unit. The correction pattern storage unit 1 is composed of a ROM or the like in which a correction pattern is written in advance. Make up,
In the white balance adjustment method in this configuration, a plurality of ROMs in which a plurality of assumed correction patterns are written are prepared, and the ROM in which the correction patterns are written is used at the time of adjustment.
Was replaced to measure the white balance, and a ROM in which an appropriate correction pattern was written was selected and mounted. However, this white balance adjustment method has a problem that the adjustment takes too much time. In order to automatically adjust the white balance in order to shorten the adjustment time, complicated circuits such as a circuit for measuring the color of emitted light and a circuit for calculating the misalignment of the balance have to be mounted. As expected.

[0003]

SUMMARY OF THE INVENTION The present invention has solved the above-mentioned problems, and has made it possible to eliminate the trouble of replacing parts such as a ROM at the time of adjustment, and to perform an accurate white balance adjustment without increasing the cost. An object is to provide a white balance adjustment device.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a memory for storing a correction pattern in which a correction pattern has been written, and an input method based on the correction pattern written in the memory for storing the correction pattern. A video processing circuit configured by a gamma correction circuit or the like for gamma correction of the RGB signal to be performed;
A PDP driving circuit for inputting a video signal from the video processing circuit to a PDP (plasma display panel);
PDP for displaying the video signal through a DP driving circuit
And a white balance adjustment device for adjusting the white balance of the plasma display device, comprising a control unit for controlling each unit, wherein the plasma display device is provided with communication means, and a memory capable of rewriting a memory for storing a correction pattern. A chromaticity measuring device for measuring the chromaticity of the PDP outside the plasma display device;
A correction pattern generating means for generating a correction pattern for obtaining a white balance of primary colors (RGB) in accordance with the chromaticity measurement result; a transfer means for transferring the correction pattern to the plasma display device; And a correction pattern writing device including a control unit that performs the correction. Also,
A correction pattern storage unit for storing a plurality of correction patterns for obtaining a white balance of a primary color signal (RGB) in accordance with a chromaticity difference from a reference white; A determination means for determining a white balance, and a RAM for reading an appropriate correction pattern from the correction pattern storage unit based on the determination result and storing the read correction pattern. A reference value storage unit that stores a reference chromaticity; a comparison unit that compares the reference chromaticity stored in the reference value storage unit with a measurement result of the chromaticity measurement device; And a determination unit for determining the white balance based on the comparison result. 4. The white balance adjustment device according to claim 3, wherein the correction pattern storage unit is a look-up table that stores a plurality of correction patterns for the determination result of the determination unit. The correction pattern was a γ correction curve. Further, the correction pattern generating means is provided with a judgment display section for displaying the judgment result of the judgment means.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS With the above-described configuration, the white balance adjusting device of the present invention measures the chromaticity of a standard image for white balance adjustment displayed on a PDP, and determines the whiteness of the measured chromaticity. The balance is determined, and an appropriate correction pattern is selected from a plurality of correction patterns stored in advance to adjust the white balance based on the determination result, and the selected correction pattern is stored in the correction pattern storage unit. Since the correction pattern stored once in the correction pattern storage unit is stored and automatically written into the correction pattern storage memory configured by a rewritable memory, it is unnecessary to add a complicated arithmetic circuit, The adjustment time can be reduced without increasing the cost.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a white balance adjusting device according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a white balance adjusting device according to the present invention, and FIG. 2 is a block diagram showing an embodiment of a determining means of the device. The same parts of the plasma display device 20 of FIG. 1 as those of FIG. 3 have the same functions and the same symbols and have been described in the section of the prior art, so that the description will be omitted. In FIG. 1, the correction pattern storage memory 1 is configured using a rewritable memory such as a nonvolatile RAM, and data to be written in the correction pattern storage memory 1 is a white balance adjustment device 3 described later.
0 is input via the communication means 6. The white balance adjusting device 30 includes a chromaticity measuring device 7 for measuring the chromaticity (x, y) of a white image displayed on the PDP 4, and a chromaticity (x, y) measured by the same chromaticity measuring device 7. A) a correction pattern generating means 9 for determining a white balance and generating a correction pattern based on the determination result; and a transfer pattern 10 for transferring the correction pattern data (Dp) to the plasma display device 20. And a writing device 8.

The correction pattern generation means 9 includes a judgment means 11 for judging the degree of white balance of the chromaticity (x, y) measured by the chromaticity measurement device 7, and a correction means obtained experimentally. Correction pattern storage unit 12 for storing a plurality of patterns
And the correction pattern storage unit 12 based on the determination result.
A RAM 13 for selecting a more appropriate correction pattern and temporarily storing data (Dp) of the selected correction pattern;
It comprises a control unit 14 for controlling each unit and a judgment display unit 15 for displaying the judgment result of the judgment means 11. The determination display unit 15 may be a lamp that displays, for example, when the determination result of the determination unit 11 is within the reference white area. Further, as shown in FIG. 2, the determination means 11 includes a reference value storage section 11a for storing a chromaticity reference value (Xs, Ys) serving as a white reference, and a reference value from the reference value storage section 11a. A comparison unit 11b that compares (Xs, Ys) with the chromaticity (x, y) measured by the chromaticity measurement device 7 and a determination unit 11c that determines a white balance from the comparison result. I have. Further, the transfer means 10 corrects the correction pattern data (D) stored in the RAM 13 of the correction pattern generation means 9.
p) is transferred to the plasma display device 20. Further, the correction pattern storage unit 12
For example, as shown in FIG. 3, a look-up table for storing correction pattern data (Dp) corresponding to a chromaticity difference (xx, yy) with respect to a reference value, for example, of a determination result of the determination unit 11 may be used. .

Next, a method of adjusting the above configuration will be described. To adjust the white balance, first, a standard correction pattern is generated by the correction pattern generation means 9,
The standard correction pattern is transmitted from the transfer unit 12, and the data (Dps) of the standard correction pattern is received by the plasma display device 20 via the communication unit 6 and written in the correction pattern storage memory 1.

Next, a standard signal for white balance adjustment is input to the plasma display device 20, displayed on the PDP, and the chromaticity measuring device 7 measures chromaticity (x, y). The measured chromaticity (x, y) is input to the correction pattern writing device 8 and the same chromaticity (x, y) and the reference value storage unit 11 are stored.
The comparison unit 11b compares the reference value (xs, ys) stored in a with the determination unit 11c to determine the white balance. If the determination result is not in the reference white area, the chromaticity is determined from the determination result. A correction pattern such that (x, y) becomes a reference white area is selected from the correction pattern storage unit 12 and stored in the RAM 13, and the correction pattern data (Dp) stored in the RAM 13 is transmitted from the transfer unit 10, The correction pattern data (Dp) is received by the plasma display device 20 via the communication means 6 and written into the correction pattern storage memory 1. Next, this is repeated until the determination means 11 displays on the determination display section that the white balance is determined to be in the reference white area, and the written correction pattern data (Dp) is determined to be appropriate. can do. The correction pattern may be selected by changing the level of the standard signal in multiple steps such as an intermediate level, a low level, and a high level. At this time, a more appropriate correction pattern in which the white balance at each level becomes a reference white area can be selected, and high-quality adjustment can be performed.

[0010]

As described above, according to the white balance adjusting apparatus of the present invention, the chromaticity of a standard image for white balance adjustment displayed on a PDP is measured, and the white balance of the measured chromaticity is determined. Then, based on the determination result, an appropriate correction pattern is selected from a plurality of correction patterns stored in advance to adjust the white balance, and the selected correction pattern is temporarily stored in the correction pattern storage unit. Since the correction patterns stored in the correction pattern storage unit are transferred and automatically written into the correction pattern storage memory composed of a rewritable memory, it is unnecessary to add a complicated arithmetic circuit, thereby increasing the cost. It is possible to provide a white balance adjustment device capable of performing an accurate white balance adjustment by shortening the adjustment time without performing the adjustment.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a white balance adjusting device according to the present invention.

FIG. 2 is a block diagram illustrating an embodiment of a determination unit of the white balance adjustment device according to the present invention.

FIG. 3 is a diagram illustrating an example of a lookup table.

FIG. 4 is a view for explaining a conventional white balance adjustment method.
FIG. 2 is a block diagram illustrating an image processing unit of the plasma display device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 correction pattern storage memory 2 video processing circuit 3 PDP drive circuit 4 PDP 5 control unit 6 communication means 7 chromaticity measurement device 8 correction pattern writing device 9 correction pattern generation means 10 transfer means 11 determination means 11a reference value storage unit 11b comparison Unit 11c Judgment unit 12 Correction pattern storage unit 13 RAM 14 Control unit 15 Judgment display unit 20 Plasma display device 21 γ correction circuit 22 Adjustment circuit 30 White balance adjustment device

Claims (6)

[Claims] An image constituted by a memory for storing a correction pattern in which a correction pattern is written, a gamma correction circuit for gamma-correcting an input RGB signal based on the correction pattern written in the memory for storing the correction pattern, and the like. A processing circuit;
A PDP driving circuit for inputting a video signal from the video processing circuit to a PDP (plasma display panel);
PDP for displaying the video signal through a DP driving circuit
And a white balance adjustment device for adjusting the white balance of the plasma display device, comprising a control unit for controlling each unit, wherein the plasma display device is provided with communication means, and a memory capable of rewriting a memory for storing a correction pattern. A chromaticity measuring device for measuring the chromaticity of the PDP outside the plasma display device;
A correction pattern generating means for generating a correction pattern for obtaining a white balance of primary colors (RGB) in accordance with the chromaticity measurement result; a transfer means for transferring the correction pattern to the plasma display device; A white balance adjustment device, comprising: a correction pattern writing device comprising a control unit for performing the correction. 2. A correction pattern storage unit for storing a plurality of correction patterns for obtaining a white balance of a primary color signal (RGB) according to a chromaticity difference from a reference white; A determination means for determining a white balance of a measurement result of the apparatus; and a RAM for reading an appropriate correction pattern from the correction pattern storage unit based on the determination result and storing the read correction pattern. The white balance adjusting device according to claim 1. 3. The comparison device according to claim 1, wherein the determining unit compares a reference chromaticity stored in the reference value storage unit with a reference chromaticity stored in the reference value storage unit and a measurement result of the chromaticity measurement device. 3. The white balance adjustment device according to claim 2, wherein the white balance adjustment device comprises a unit and a determination unit that determines a white balance based on a comparison result of the comparison unit. 4. The white balance adjustment device according to claim 3, wherein the correction pattern storage unit is a look-up table that stores a plurality of correction patterns for the determination result of the determination unit. 5. The white balance adjusting device according to claim 1, wherein the correction pattern is a γ correction curve. 6. The white balance adjusting device according to claim 2, wherein the correction pattern generating means is provided with a judgment display section for displaying a judgment result of the judgment means.