JPS62188583A - White uniformity adjusting circuit for color television receiver - Google Patents

Abstract

PURPOSE:To easily realize the adjustment of a white uniformity by an electric circuit by providing a picture division means and a contrast adjusting means for adjusting the size of the signal corresponding to the part optionally selected on the divided parts of the picture every primary color signal. CONSTITUTION:For instance, an operator for the adjustment observes the display 8 receiving a white signal and selects the optional part of the picture divided in a control signal generating circuit 1 in a data input circuit 2, Now, when the light of the red fluorescent member is weak in a certain part, the signal is inputted in the data input circuit 2 so as to enlarge a red contrast in a memory circuit 3 for storing a red signal, namely, while adjusting the quantity of data so as to increase the quantity of the beam of a red electron gun. This adjustment is executed on the optional part of the picture on the respective signals of red, green and blue and then, the adjustment of the white uniformity can be carried out. Thus, the device is constituted of the electric circuit, so that the highly accurate adjustment can be easily performed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a white uniformity adjustment circuit that can easily adjust the white uniformity of a color television receiver using an electric circuit. It is.

[Conventional technology]

Conventionally, in color television receivers, white uniformity has often been impaired due to the processing precision of shadow masks or manufacturing variations in electron guns and deflection yokes. Adjustment of color purity magnets and the attachment of magnets to cathode ray tubes have been carried out.

[Problem that the invention seeks to solve]

However, as the definition of cathode ray tubes increases, the dot diameter of the shadow mask or the beam diameter becomes smaller, making it difficult to adjust white uniformity using only the above methods. The demands for this are also becoming higher.

Therefore, the conventional adjustment methods described above have not been able to perform sufficient adjustment.

The present invention aims to provide a white uniformity adjustment circuit for a color television receiver that can easily adjust white uniformity without relying on mechanical means or the experience of an adjuster as described above. .

[Means for solving problems]

The white uniformity adjustment circuit for a color television receiver according to the present invention includes a screen dividing means for dividing the screen into appropriate parts on the screen, and a signal size corresponding to an arbitrarily selected part of the divided parts of the screen. The contrast adjustment means for adjusting the contrast of each primary color signal is provided.

[Effect]

In this invention, the magnitude of the signal corresponding to an arbitrarily selected portion of the divided portions of the screen divided by the screen dividing means is controlled to an arbitrary size by the contrast adjusting means for each primary color signal. By receiving the signal and controlling the intensity of the light on the R, G, and B light surfaces of each divided portion, it is possible to adjust the white color to be uniform over the entire screen.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure shows a white uniformity adjustment circuit for a color television receiver according to an embodiment of the present invention. In the figure, 1 is for inputting a horizontal synchronizing signal HD and a vertical synchronizing signal VD, and dividing the screen into appropriate parts. A control signal generating circuit (screen dividing means) 2 which generates control signals, etc. arbitrarily specifies the divided portion by the control signal generating circuit 1 so that the signal corresponding to the designated portion has an arbitrary size. 3 is a data input circuit 2 which is controlled by the control signal generated by the control signal generation circuit 1.
This is a memory circuit that stores and outputs input data.

Further, 4 is a digital/analog conversion circuit that converts the digital data output from the memory circuit 3 into an analog signal, 5 is a contrast drive circuit that changes the amplitude of the video signal according to the output of the digital/analog conversion circuit 4, and 6 is a video 10 is the data input circuit 2. Memory circuit 3. Digital/analog conversion circuit 4.
This is a contrast adjustment means constituted by a contrast drive circuit 5. Note that 7 is the control signal generating circuit 1. Memory circuit 3. Digital/analog conversion circuit 4.
This is a white uniformity adjustment circuit made up of each circuit of the contrast drive circuit 5.

For example, in a television receiver, three white uniformity adjustment circuits 71, 72, and 73 are provided for red, green, and blue, as shown in Figure 2.
The output of each circuit is outputted to a display device such as a cathode ray tube 8 through video circuits 61, 62, and 63, respectively.

In the white uniformity adjustment circuit configured as described above, for example, the adjuster observes the display 8 that has received the white signal, and uses the data input circuit 2 to select any part of the screen divided by the control signal generation circuit l. select.

Now, if the light of the red phosphor is weak in a certain part of the screen, the memory circuit for storing the red light will adjust the amount of data so that the red contrast increases, that is, the beam amount of the red electron gun increases. A signal is input through the data input circuit 2. White uniformity can be adjusted by performing this adjustment for each of the red, green, and blue signals on arbitrary parts of the screen.

In the above embodiment, the red, green, and blue white uniformity circuits are described as being independent, but the control signal generating circuit 1 in the white uniformity circuit may be common to red, green, and blue. , the same effect as the above embodiment is achieved.

〔Effect of the invention〕

As described above, according to the white uniformity adjustment circuit for a color television receiver according to the present invention, since the device is constituted by an electric circuit, there is an effect that adjustment can be performed easily and with high precision. .

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a diagram showing the internal configuration of a white uniformity adjustment circuit of a color television receiver according to an embodiment of the present invention, and FIG. FIG. In the figure, 1 is a control signal generation circuit (screen dividing means);
2 is a data input circuit, 3 is a memory circuit, 4 is a digital/analog conversion circuit, 5 is a contrast drive circuit,
6 is a video circuit, 7 is a white uniformity adjustment circuit, 10 is a contrast adjustment means, 61 is a red video circuit, 62 is a green video circuit, 63 is a blue video circuit, 71 is a red-white uniformity adjustment circuit, 72 is a green-white A uniformity adjustment circuit 73 is a blue and white uniformity adjustment circuit, and 8 is a display device. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] (1) A screen dividing means for dividing the screen of a color television receiver into appropriate parts, and determining the magnitude of the signal corresponding to any part of the divided parts of the screen divided by the screen dividing means for each primary color signal. A white uniformity adjustment circuit for a color television receiver, comprising a contrast adjustment means for adjusting each size to an arbitrary size.