JPH06342267A - Detecting method for position on screen - Google Patents

Abstract

PURPOSE:To perform color adjustment and position adjustment by means of a single measuring device by outputting a predetermined displaying pattern to a screen and detecting the position of the display screen of a sensor fixing part using the measured value by a luminance meter. CONSTITUTION:A sensor 3 of a luminance meter 2 is installed in front of a CRT to be measured, a pattern signal is sent from a signal generator 4 to the CRT 1 and displayed. The result measured by the sensor 3 of the luminance meter 2 is calculated in an arithmetic part 5, an operator for measurement adjusts the position on a screen and colors by means of an adjusting part 6 for position on the screen and a color adjusting part 7 by observing the arithmetic result. The position on the screen and a color are also automatically adjusted by using the arithmetic result of the arithmetic part 5 through a controller 8 as shown by dotted lines. Consequently, since an identical measuring device is used for the adjustment of the position on the screen and color adjustment, the expenses of the measuring device are cut down while the labor for exchanging the measuring device is saved when the adjustment of the position on the screen and color adjustment are performed successively and the time for adjustment is shortened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display screen position detecting method in a color display device.

[0002]

2. Description of the Related Art The following methods are known as a screen position measuring method in a color display device using a conventional cathode ray tube. A standard frame in which the screen size and the center position are entered is attached in front of the tube surface, and the pattern displayed on the screen is such that the outer frame and center position of the screen and the tilt of the screen can be seen. A method of adjusting the screen size and center position while visually comparing this display pattern with the reference frame.

An optical sensor is arranged in front of the tube surface in accordance with a prescribed screen size, and the display screen is moved vertically and horizontally, or the screen size is enlarged or reduced. At this time, the output of the optical sensor changes, so the screen display position is determined and the screen size is adjusted. A method in which a camera is placed in front of the tube surface, the display screen is shot with this camera, and the screen size and center position are identified by image processing.

[0004]

However, the above-mentioned method of using the reference frame and the method of arranging the optical sensor on the tube surface are as follows.
This is a method dedicated to screen position adjustment, and usually color adjustment and position adjustment are often performed consecutively, so when performing color adjustment before and after position adjustment, separately measure the brightness and chromaticity. A measuring instrument (luminance meter) for Since the measuring device is required for each of the position adjustment and the color adjustment in this way, the cost becomes higher and it takes time and effort to replace the measuring device. If you use the method of image processing using a camera, you can perform position adjustment and color adjustment without replacing the measuring device, but the camera and the image processing device itself are expensive, and the brightness and chromaticity are measured. To do this, it is better to use a luminance meter.

Therefore, in order to solve such a conventional problem, an object of the present invention is to obtain a method for detecting a screen position using a luminance meter. The luminance meter is originally used for color adjustment, and according to the present invention, it is possible to perform color adjustment and position adjustment using one measuring device (luminance meter).

[0006]

In order to solve the above problems, the present invention provides a display in which the brightness and chromaticity are different at each place on the display screen, and the brightness and chromaticity at each place are predetermined. Create a pattern and print it on the screen. The sensor of the luminance meter is fixed on the tube surface, and the luminance and chromaticity of the fixed portion are measured. Since the luminance and chromaticity at each place on the screen are already known, it is possible to know which position on the screen the fixed position of the sensor of the luminance meter matches by reading the measured value. That is, the screen position can be detected from the measured value of the luminance meter.

[0007]

In the method for detecting the screen position in the cathode ray tube display device constructed as described above, when the sensor fixing position of the luminance meter is fixed to the center of the tube surface, the luminance and color of the center of the predetermined display pattern are determined. The center position of the screen can be adjusted by moving the screen up and down and left and right so that the degree matches the measurement value of the luminance meter. Also, when the center position is not adjusted, you can see how the display screen is positioned from the measured values, so you should move the screen up, down, left or right to adjust to the center position. You can know.

When a plurality of sensors are attached to the tube surface, the size of the screen can be adjusted from the fixed positions of the sensors and the distance between the sensors. Further, since the luminance and chromaticity can be measured, it is possible to perform color adjustment such as white balance. Since the same measuring device can be used for screen position adjustment and color adjustment, the measuring device can be kept at a low cost, and at the same time the measuring device can be replaced when performing color adjustment and position adjustment continuously. It also saves time and shortens the adjustment time.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of a screen position detecting method according to the present invention. Sensor 3 of luminance meter 2 before CRT 1 to be measured
Set up. A pattern signal, which will be described later, is sent from the signal generator 4 to the CRT 1 for display. The calculation unit 5 calculates the result measured by the sensor 3 of the luminance meter 2. The operator adjusts the screen position and the color with the screen position adjusting unit 6 and the color adjusting unit 7 by looking at the calculation result.

It is also possible to automatically adjust the screen position and color of the calculation result of the calculation unit 5 through the controller 8 as shown by the dotted line. Next, referring to FIG. 2, an example of the first display pattern in which the luminance and the chromaticity are continuously different at each place on the display screen will be described. If the lower left coordinate of the screen 21 is (0, 0), the upper right coordinate of the screen is (AMAX, BMAX), and the arbitrary coordinate of the screen is represented by (A, B), the green at the coordinate (A, B) The luminance YG of the phosphor and the luminance YR of the red phosphor can be expressed by the following equations.

YG = YGMAX.A / AMAX YR = YRMAX.B / BMAX where YGMAX is the brightness of the green phosphor at the coordinate A = AMAX and YRMAX is the color of the red phosphor at the coordinate B = BMAX. Coordinates. That is, the first display pattern is a pattern in which the luminance of green increases as the coordinate A increases, and the luminance of red increases as the coordinate B increases, so that the chromaticity that is combined with the luminance ratio of green and red is Continuously different at each location on the screen. Since the chromaticity is continuously different over the entire screen,
The screen position can be detected from the measured value of the luminance meter.

FIG. 3 shows an example of a second display pattern in which the display screen is divided and the divided areas are displayed in colors having different chromaticities. In FIG. 3, the screen 21 is divided into four areas, and the divided areas are displayed in red, green, blue, and yellow, and the chromaticity of these four colors is known in advance. At this time, the brightness of the four colors may be different or the same. In the case of this second display pattern, unlike the first display pattern, it is not possible to accurately detect all of the locations on the screen 21, but since the chromaticity of the four-divided areas is different, the fixed position of the sensor is It is possible to judge which area is divided into four.
In addition, in the boundary line portion that divides the screen, the position can be detected in the direction perpendicular to the boundary line. The measurement range of the sensor has a certain area. For example, when the sensor 3 of the luminance meter 2 is at the position 23 in FIG. 3, the area ratio of red and yellow within the measurement range of the sensor is measured from the measured value. If it is known that the ratio is 1: 1, it can be determined that the position where the sensor is fixed is exactly the center position in the left-right direction and is located above the upper and lower halves.

FIG. 4 is an explanatory diagram when the center position is adjusted using the method of the present invention. The sensor 3 of the luminance meter 2 is arranged at the center 23 of the tube surface. This center position adjustment
When the display pattern is used, if YG and YR are respectively obtained from the measurement values of the luminance meter as YG = 1 / 2.YGMAX YR = 1 / 2.YRMAX, the screen is located at the center. The luminance and chromaticity, which are the measured values, are obtained as an average value within the measurement range of the sensor, but in the case of the display pattern of FIG. There is no. When the display pattern of FIG. 3 is used for this center position adjustment, the area ratio of red, green, blue, and yellow within the measurement range of the sensor from the measurement value of the luminance meter may be 1: 1: 1: 1. If you know, the screen is in the center.

FIG. 5 is an explanatory diagram when the screen size is adjusted. It is assumed that two sensors are arranged at 24 and 25 positions at a distance of 2 m in the horizontal direction and 2 n in the vertical direction, and the screen size is to be adjusted to horizontal M and vertical N. If the display pattern of FIG. 2 is used, the green and red luminances YG1 and YR1 calculated from the measured values of the first sensor are YG1 = YGMAX. (M-2m) / 2M YR1 = YRMAX. (N-2n ) / 2N, and if the green and red luminances YG2 and YR2 calculated from the measurement values of the second sensor are YG2 = YGMAX. (M + 2m) / 2M YR2 = YRMAX. (N + 2n) / 2N, the screen size Has been adjusted.

[0015]

As described above, according to the present invention, the predetermined display pattern is output to the screen, and the display screen position of the sensor fixed portion can be detected from the measured value of the luminance meter. Since there is no need for a dedicated measuring instrument, the measuring system can be constructed inexpensively, and there is no need to replace the measuring instrument, so there is an advantage that labor is saved and adjustment time can be shortened.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a screen position detection method according to the present invention.

FIG. 2 is an explanatory diagram showing an example of a first display pattern used in the present invention.

FIG. 3 is an explanatory diagram showing an example of a second display pattern used in the present invention.

FIG. 4 is an explanatory diagram in the case of adjusting the screen center position using the present invention.

FIG. 5 is an explanatory diagram for performing screen size adjustment using the present invention.

[Explanation of symbols]

 1 CRT 2 Luminance meter 3 Sensor 4 Signal generator 5 Calculation unit 6 Adjustment unit 7 Color adjustment unit 8 Controller

Claims (1)

[Claims] 1. A measurement for generating a color display pattern having different chromaticity in one drawing, displaying the color display pattern by a display means, and detecting the brightness and chromaticity with the display facing the display surface and fixed. A screen position detecting method characterized by detecting a screen position based on a value measured by a measuring instrument.