JPH11305709A - Method and device for adjusting color picture quality of color display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the troublesomeness and inaccuracy of adjustment of color picture quality. SOLUTION: This device is equipped with the color display device 1 which has a color cathode-ray tube, an optical sensor 2 which measures the luminance of the color screen of the color cathode-ray tube, and a signal generator 5 which outputs color signals of cyan, magenta, blue, and white. The color display device 1 has a Hue adjusting (color picture quality adjusting) function, a color adjusting function, and a switch circuit which can input only a blue component among color signals of blue, red, and green to the color cathode-ray tube, projects an image on the cathode-ray tube with the blue signal, and inputs the respective signals of cyan, magenta, and white blue thereto; and luminance values YC, YM, YW, and YB of respective screens are measured and adjusting operation for obtaining YC=YM and YW=YB by adjusting the hues of the colors when YC≠YM and the density of the colors when YW≠YB is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color image quality adjusting method and a color image quality adjusting device for a color display device such as a color television receiver.

[0002]

2. Description of the Related Art Conventionally, color image quality adjustment in a color display device, for example, a color TV (television) set, that is, color adjustment, so-called Hue adjustment (hereinafter referred to as Hue adjustment), and color density adjustment, so-called color adjustment (hereinafter, referred to as color adjustment). In the case of performing color adjustment), a color bar signal is input to a color signal synthesizer. At that time, for example, in a cathode drive type color cathode ray tube, a blue output drive waveform with respect to the cathode is measured, and the peak value of each is measured. Hue adjustment and color adjustment are performed so as to be equal. That is, in this method, the adjustment is performed by measuring the drive waveform of the cathode of the cathode ray tube in the color television receiver.

[0003]

However, since the evaluation of the image quality in a color display device such as a color television receiver is performed by observing the screen, the drive waveform and the color on the screen of the cathode ray tube are evaluated. It requires an operation to correlate with the appearance, and the adjustment algorithm becomes complicated. Further, the circuit configuration becomes complicated, for example, a buffer circuit for sending the cathode drive waveform to the adjustment means side is required.

[0004] The present invention aims to solve such a problem,
By adjusting the color image quality directly based on the information obtained from the screen of the cathode ray tube, avoiding the adjustment by the drive waveform as in the past, it is possible to simplify the adjustment and improve the image quality. Make adjustments possible.

[0005]

According to the method of the present invention, in adjusting the color image quality of a color display device having a color cathode ray tube, a screen in which only a blue component is inputted and a cyan signal is inputted into the color cathode ray tube, respectively, and Hue adjustment and color adjustment are performed so that each blue component of the screen to which the signal is input, the screen to which the white signal is input, and the screen to which the blue signal is input are equal.

The present invention also provides a color display device having a color cathode ray tube, an optical sensor for measuring the luminance of a color screen of the color cathode ray tube, and a signal generator for outputting cyan, magenta, blue and white color signals. And a container. The color display device includes a Hue adjustment function, a color adjustment function, and a switch circuit capable of inputting only the blue component of the blue, red, and green color signals to the color cathode ray tube.

The color image quality is adjusted by the device of the present invention by inputting only the blue component signal to a color cathode ray tube by a switch circuit, and inputting cyan, magenta, white, and blue signals from a signal generator. Measure the brightness YC, YM, YW, YB of each projected screen with the optical sensor. If YC ≠ YM, adjust the color tone. If YW ≠ YB, adjust the color density. Then, an adjustment operation of setting YC = YM and YW = YB is performed.

That is, in the present invention, only the blue component is input, that is, while the blue screen is kept,
By inputting cyan, magenta, white, and blue signals, respective luminances YC,
Measure YM, YW, YB, YC = YM and YW = Y
B, that is, adjustment is performed so that the luminance of the blue component is equal in any screen. Thus, in the present invention, the measurement from the projected screen, that is, the actually observed screen is performed. To adjust the image quality.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a color image quality adjusting method for a color display device having a color cathode ray tube according to the present invention is a screen in which only a blue component is inputted to a color cathode ray tube and a cyan signal is inputted respectively. When,
The screen to which the magenta signal is input, the screen to which the white signal is input, and the screen to which the blue signal is input are sequentially projected on the screen of the color cathode ray tube in an arbitrary order.

According to another embodiment of the method of the present invention, a screen to which only the above-mentioned blue component is inputted and a cyan signal is inputted respectively, a screen to which a magenta signal is inputted, and
The screen to which the white signal is input and the screen to which the blue signal is input are simultaneously projected on the four divided screens of the color cathode ray tube screen.

In any case, the brightness of each screen is measured by an optical sensor for each of YC, YM, YW, and YB. If YC ≠ YM, the color tone is adjusted, and if YW ≠ YB, Adjusts the color depth,
An adjustment operation is performed with YC = YM and YW = YB.

A color image quality adjusting device for a color display apparatus according to the present invention is an apparatus for implementing the above-described method of the present invention, and FIG. 1 shows a schematic configuration of an example thereof. However, the device of the present invention is not limited to this example.
The device of the present invention is a color display device 1 having a color cathode ray tube, for example, a color TV set, and an optical sensor 2 mounted on the color screen 1s, that is, in front of the color phosphor screen so as to measure the luminance of the screen. For example, one or more photodiodes, and an analog / digital converter (A / D converter) that converts an analog luminance detection signal from the optical sensor 2 into a digital signal.
3 and a computer for inputting the digital signal. Actually, a personal computer 4 and cyan, magenta,
A signal generator 5 for outputting blue and white color signals, for example, a video signal generator is provided.

The color display device has a Hue adjusting means having a Hue adjusting function having a well-known configuration, and a color adjusting means having a so-called color adjusting function, wherein only blue among red, blue and green is a color cathode ray tube. At least a switch circuit that can be input to the switch.

The computer 4 analyzes the detection output from the optical sensor, that is, the luminance of the screen 1 s, controls each of the cyan, magenta, blue, and white color signals from the signal generator 5 by a video signal generator, for example. The control of each of the above adjustments of the display device is performed.

An example of a procedure for carrying out the method of the present invention using the above-described apparatus of the present invention will be described. First, a color display device 1 such as a color TV
The optical sensor 2 is mounted on the set screen 1s. And
A video input terminal provided in the TV set is connected to, for example, an output terminal of a video signal generator of the signal generator 5. For example, under the control of the computer 4, that is, the personal computer, the red and green components are turned off and only the blue component is input to the color cathode ray tube by the above-described switch circuit. That is, in the case of a color cathode ray tube driven by a cathode drive, a blue signal is input to a cathode to be introduced, and a blue screen is projected on the color phosphor screen 1s. Then, a color signal of one of cyan, magenta, white, and blue, for example, a cyan signal is input to the cathode ray tube together with the blue signal, and the cathode ray tube screen at this time is input.
That is, the luminance YC of the screen on which blue is projected is detected by the optical sensor 2, the detected output is A / D converted by the A / D converter 3, and input to the computer 4. From the signal generator 5, cyan, magenta, white,
Another color of blue, for example, a magenta signal is input to the cathode ray tube, and the luminance YM of the cathode ray tube screen at this time, that is, the screen on which blue is projected, is detected by the optical sensor 2, and the detection output is obtained. A / D conversion by the A / D converter 3
D-converted and input to the computer 4. Next, another signal, for example, a white signal among cyan, magenta, white, and blue is input to the cathode ray tube from the signal generator 5, and the cathode ray tube screen at this time, that is, the screen on which blue is projected Is detected by the optical sensor 2 and the detected output is output from the A / D converter 3.
A / D-converted and input to the computer 4. Next, a blue signal of another color among cyan, magenta, white, and blue is input to the cathode ray tube from the signal generator 5, and the cathode ray tube screen at this time, that is, the screen on which blue is projected Is detected by the optical sensor 2, the detected output is A / D converted by the A / D converter 3, and is input to the computer 4. The luminance YC is compared with YM and the luminance YW is compared with YB.
If YM and YW = YB, the image quality adjustment ends. When YC ≠ YM or YW ≠ YB, the following operation is performed. If YC ≠ YM, Hue adjustment is performed, and YW
If ≠ YB, color adjustment is performed. When the above operation is performed, the above operations are repeated.

As described above, according to the apparatus and the method of the present invention, the image quality is adjusted by measuring the luminance of the screen itself. Since it is not necessary to perform the correction in consideration of the correlation between the drive waveform and the screen so that the blue drive waveforms of the cathode ray tubes corresponding to the respective colors of blue and white become equal, the Hue adjustment on the screen is performed. Also, image quality adjustment by color adjustment can be performed more accurately than in a case where it is performed indirectly.

The above-mentioned steps (1), (2), namely, the control of the switch circuit for the blue signal, the signal generator 5
Output of required color signals from the CCD and input control to a cathode ray tube, detection control of the optical sensor 2 for measuring luminances YC, YM, YW, and YB of cyan, magenta, white, and blue, and luminances YC , YM, YW, YB, etc., analysis and calculation, Hue adjustment and color adjustment based on the results, and control of operations such as switching of the subsequent work,
Performs instructions, calculations, etc. However, for example, a part of the operation, for example, the operation of the switch circuit, the Hue adjustment, the color adjustment, and the like, for example, the operation on the color TV set, that is, the operation on the color display device can also be manually performed by the operation of the adjustment operator.

In the above-described example, each of the luminances YC, YC
In the case where M, YW, and YB measurements are sequentially performed, cyan, magenta, white, and blue signals are simultaneously input, and the screen is divided into four parts to be displayed. Correspondingly, by providing the optical sensor 2 and the A / D converter 3 attached thereto, it is possible to simultaneously measure the luminances YC, YM, YW, and YB. In this case, the adjustment time can be reduced and the signal generator 5, that is, the video signal generator can be simplified.

Usually, the contrast is adjusted by the cathode drive waveform in the cathode drive type cathode ray tube, but the contrast can be adjusted by the above-described luminance measurement.

In the above-described example, the color display device is exemplified by a color TV set. However, the color display device is not limited to a TV set for receiving a so-called TV signal, but is used for various purposes constituted by a color cathode ray tube. The present invention can be applied to adjustment of a display device.

[0021]

As described above, according to the present invention, the image quality of the color screen of the color display device is adjusted by the so-called direct measurement from the actually observed screen. It is not necessary to perform the correction in consideration of the correlation between the drive waveform and the actual screen in the measurement using, for example, the cathode drive waveform as in the related art. Therefore, you can adjust the image quality accurately and easily,
It can be performed efficiently. In addition, it is possible to simplify the apparatus and reduce the cost, for example, by omitting a buffer circuit or the like for transmitting the conventional drive waveform to the adjusting means described above. Further, a high-quality color display device can be mass-produced, which can bring great industrial benefits.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an example of a color image quality adjusting device of a color display device according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Color display device, 1s ... Color screen, 2 ... Optical sensor, 3 ... A / D converter, 4 ...
..Computers, 5 ... Signal generators

──────────────────────────────────────────────────続 き Continued on front page (51) Int.Cl. ⁶ Identification code FI H04N 9/28 H04N 9/28 Z

Claims (8)

[Claims] When adjusting the color image quality of a color display device having a color cathode ray tube, a screen in which only a blue component is input and a cyan signal is input to the color cathode ray tube, a screen in which a magenta signal is input, and A color image quality adjusting method for a color display device, comprising: adjusting a hue and a color density so that the luminance of each blue component of a screen to which a signal is input and a screen to which a blue signal is input are equal. 2. A screen in which only the blue component is input and a cyan signal is input, a screen in which a magenta signal is input, a screen in which a white signal is input, and a screen in which a blue signal is input are arranged in an arbitrary order. 2. The method according to claim 1, wherein the images are sequentially displayed. 3. A screen in which a cyan signal is input, a screen in which a magenta signal is input, a screen in which a white signal is input, and a screen in which a blue signal is input simultaneously with inputting only the blue component. 4 on the tube screen
2. The method according to claim 1, wherein the image is divided and projected. 4. A luminance YC of a screen to which a cyan signal is inputted together with the input of only the blue component, a luminance YM of a screen to which a magenta signal is inputted, a luminance YW of a screen to which a white signal is inputted, and a blue signal to be inputted. 2. The color image quality adjusting method according to claim 1, wherein the adjustment is performed such that YC = YM and YW = YB by measuring the luminance YB of the screen. 5. A color display device having a color cathode ray tube, an optical sensor for measuring the luminance of a color screen of the color cathode ray tube, and a signal generator for outputting each of cyan, magenta, blue and white color signals. The color display device comprises a color adjustment function, a color density adjustment function, and a switch circuit capable of inputting only the blue component out of blue, red, and green to the color cathode ray tube. With the switch circuit, only the blue component is input to the color cathode ray tube, and the respective signals of cyan, magenta, white, and blue are input from the signal generator, and the luminances YC, YM of the respective screens projected. , YW, and YB are measured by the above-described optical sensor. If YC ≠ YM, the color tone is adjusted, and
A color image quality adjusting device for a color display device, wherein if B, color density is adjusted to perform adjustment work of setting YC = YM and YW = YB. 6. A color image quality adjusting device for a color display device according to claim 5, wherein a screen for inputting and projecting cyan, magenta, white, and blue signals together with the input of only the blue component is displayed in an arbitrary order. A color image quality adjusting device for a color display device, wherein the color image quality is sequentially projected on the screen of the color cathode ray tube. 7. A color cathode ray tube according to claim 5, wherein a screen for inputting and displaying cyan, magenta, white, and blue signals together with inputting only said blue component is displayed on said color cathode ray tube. A color image quality adjusting device for a color display device, wherein the image is divided into four parts and projected on a screen at the same time. 8. The color image quality adjusting device for a color display device according to claim 5, further comprising: an analog / digital converter for converting an output from said optical sensor into a digital signal; A color image quality adjusting device for a color display device, wherein the color image quality adjusting device is configured to perform a part of the work automatically.