KR100301018B1 - Method and apparatus for inspecting convergence of a color cathod ray tube - Google Patents

Abstract

When changing the model of the cathode ray tube to be measured, the image information about the region of interest of the convergence measurement is divided and extracted through two reflection mirrors that can change the posture in response to the change of the screen standard. A method and apparatus for measuring the convergence of a color cathode ray tube by calculating a misconvergence amount as data by comparison between a signal converted by a signal converter and a reference signal previously input to a control means is disclosed.

Description

Convergence measuring device of color cathode ray tube {Method and apparatus for inspecting convergence of a color cathod ray tube}

The present invention relates to a method and a measuring device for measuring the convergence of a color cathode ray tube, and in particular, a color cathode ray tube capable of measuring an arbitrarily set size of a convergence measurement screen area in response to a change in screen size caused by a model change of a color cathode ray tube. It relates to a convergence measuring method and a measuring apparatus.

In general, an in-line color cathode ray tube used as a video display device such as a color television receiver or a color monitor has three primary colors for the entire area of an image display screen to faithfully reproduce the colors of the displayed image. Dragon electron beam, that is, red, green, and blue three-color electron beams emitted from three electron guns (three tubes) (hereinafter referred to as R, G, and B beams) It is necessary to adjust the concentration at one pixel point on the cathode ray tube screen at different angles of incidence, i.e., convergence.

Such convergence is usually divided into static or central convergence, which adjusts the overall convergence mismatch (hereinafter, referred to as mis-convergence) and dynamic convergence, a local correction concept. Lose.

Due to the necessity of the above-mentioned convergence, in the conventional in-line type color cathode ray tube, a strong pin-cushion type of horizontal deflection magnetic field of deflection yoke provided between the three tubes and the screen is obtained in order to obtain a good focus state of the three electron beams on the screen. The magnetic field is formed, and a vertical deflection magnetic field is formed into a strong barrel-type magnetic field so as to change the traveling direction of the three beams through these magnetic fields to focus on the screen.

However, each electron beam emitted from the electron gun of the cathode ray tube is deflected by a deflection yoke installed in the cone portion of the cathode ray tube to excite the fluorescent film, thereby drawing a raster on the screen, which is a nonuniform magnetic field of the deflection yoke. Miss convergence occurs due to mechanical mechanism error and curvature difference of cathode ray tube panel due to cathode ray tube assembly accuracy, resulting in poor display state.

The conventional color cathode ray tube convergence measuring method and its apparatus are largely of the following two types, one of which uses a camera 12 serving as an area sensor as shown in FIG. The convergence is measured by inputting a signal of an image pattern displayed on the screen of the convergence measurement target cathode ray tube 10. In addition, as shown in FIG. 2, the signal of the image pattern displayed on the screen of the cathode ray tube 10 to be measured for convergence is measured using a plurality of optical sensors 21 serving as point sensors. To measure convergence.

In the conventional convergence measuring apparatus shown in FIGS. 1 and 2, a cross hatch pattern is formed on the screen of the cathode ray tube 10 to be measured through a signal generator 11 such as a pattern generator. Display a specific image pattern. At this time, if there is no convergence, the images of R, G, and B appear to be spaced apart from each other at a predetermined interval, and the image information in such a state is input to the camera 12 and the optical sensor 21, and spaced apart from each other. By measuring the relative distance between R, G, and B images, the convergence state is measured.

At this time, the convergence measuring apparatus shown in FIG. 1 converts the image information inputted by the signal converter built in the camera 12 into a signal and sends the result to a controller built in the monitor 13 to compare with the reference value set. The amount of convergence is extracted and displayed as data.

In addition, the convergence measuring apparatus shown in FIG. 2 compares the image information inputted by the signal converter 22 connected to the optical sensor 21 to a signal and transmits the image information to a controller built in the monitor 13 to compare with a reference value set. The amount of misconvergence is extracted and displayed as data.

However, in the convergence measuring apparatus shown in FIG. 1, since one camera 12 is fixed to input image information of a cathode ray tube screen region of a specific model, when the model of the cathode ray tube to be measured is changed. Since the screen area is changed and the resolution of image information by the same camera is changed, there is a problem that the degree of convergence measurement is lowered.

In addition, in the convergence measuring apparatus shown in FIG. 2, when the model of the measurement target cathode ray tube is changed since the optical sensor 21 is arranged to input image information of a region of interest of the cathode ray tube screen of the specific model. Since the number or position of the optical sensors must be readjusted according to the screen area, there is a problem that the measurement efficiency is degraded.

Accordingly, the present invention was created to improve the problems of the conventional cathode ray tube convergence measuring method and apparatus as described above, and an object of the present invention is to respond to the change of the screen size according to the model change of the color cathode ray tube. Convergence Measurement It is intended to provide a method for measuring the convergence of color cathode ray tubes that can improve the accuracy and efficiency of convergence measurement by arbitrarily setting and measuring the size of the screen area.

Another object of the present invention is to provide a convergence measuring apparatus which can apply the method of measuring the convergence of a color cathode ray tube according to the present invention in an optimal state.

1 is a configuration diagram schematically showing a convergence measuring device of a conventional color cathode ray tube,

2 is a configuration diagram schematically showing a conventional apparatus for measuring the convergence of another conventional cathode ray tube;

Figure 3 is a schematic view showing a device for measuring the convergence of the color cathode ray tube according to the present invention.

<Explanation of symbols for the main parts of the drawings>

100 ... color cathode ray tube

110 ... Signal Generator (Pattern Generator)

121, 122 ... reflective mirror

123, 124 ... actuator

131 Zoom Lens

132 Camera

133 ... Signal Converter

141 Controller (Frameboard)

142 ... Personal Computer

The cathode ray tube convergence measuring method according to the present invention for achieving the above object comprises the steps of displaying a specific image pattern on the screen of the cathode ray tube to be measured by the image pattern signal generating means; An imaging area dividing step of selecting a specific screen area of the cathode ray tube and extracting image information of an image pattern on the screen area using an optical system including a mirror; Inputting image information on the image pattern extracted in the imaging area dividing step into an image input means; A signal conversion step of converting the image information of the image pattern input to the image input means into an electrical signal by the signal conversion means; And a convergence measurement step of calculating a misconvergence amount as data by comparing a signal output from the signal conversion step with a pre-input reference signal through a control means.

In addition, the cathode ray tube convergence measuring apparatus according to the present invention for achieving the above-described object, the signal generator for generating a signal for displaying a specific image pattern on the screen of the cathode ray tube to be measured convergence; Imaging area dividing means including a mirror for selecting a specific screen area of the cathode ray tube and extracting image information of an image pattern with respect to the screen area; Image input means for inputting image information on an image pattern of a specific screen region extracted by said imaging region dividing means; A signal converter for converting the image information of the image pattern input by the image input means into an electrical signal; And controlling the signal generator to form a specific image pattern on the screen of the cathode ray tube, and calculating and displaying the amount of misconvergence as data by comparing a signal input from the signal converter with a reference signal value input in advance. Means; characterized in that it comprises a.

According to the apparatus for measuring the convergence of a color cathode ray tube according to the present invention, the imaging area dividing means includes two reflection mirrors installed to change an image optical axis of a specific screen area of the cathode ray tube to a specific path, It is preferable that the reflection mirror is provided so that its attitude can be changed by driving an actuator so that the incident optical axis can be reflected by changing a plurality of paths.

Preferably, the image input means is a camera having a zoom lens capable of focusing image information on an image pattern of a specific screen region extracted by the imaging region dividing means.

The control unit may be configured to calculate and display a misconvergence amount as data by comparing a controller inputted from the signal converter to a digital signal, and comparing the digital signal converted by the controller with a reference signal value input in advance. It is preferable to include a personal computer.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the method and measuring apparatus for measuring the convergence of the color cathode ray tube according to the present invention.

Referring to FIG. 3 schematically illustrating an apparatus for measuring the convergence of a color cathode ray tube according to the present invention, a signal for displaying a specific image pattern such as, for example, a cross hatch pattern may be generated on a screen of the cathode ray tube 100 to be measured. A signal generator 110, an image capturing region dividing means 120 for selecting and extracting image information of a specific screen region of the cathode ray tube 100, that is, a region of interest for measurement of convergence, and the image capturing region dividing means 120 Image input means 130 for inputting the image information of the image pattern reflected by &lt; RTI ID = 0.0 &gt;), &lt; / RTI &gt; and a signal converter 133 for converting the image information of the image pattern input by the image input means 130 into an electrical signal. And the amount of misconvergence by controlling the signal generator 110 and comparing the signal input from the signal converter 133 with a reference signal value input in advance. And control means 140 for calculating and displaying the data.

According to the present invention, the image capturing region dividing means 120 extracts an image of an image pattern of a specific screen region of the cathode ray tube 100 and inputs the image optical axis to the image input means 130. The first reflecting mirror 121 and the second reflecting mirror 122, which are sequentially changed, and the first reflecting mirror 121 and the second reflecting mirror (corresponding to a specific screen area of the cathode ray tube 100). Actuators 123 and 124 for changing the posture of each 122 is included.

The image input means 130 includes a camera 132 having a zoom lens 131 capable of focusing image information of an image pattern on a specific screen region extracted by the image capturing region dividing means 120. do.

In addition, the control unit 140 converts a signal input from the signal converter 133 into a digital signal, for example, a controller 141 such as a frame board and a digital signal converted by the controller 141 in advance. And a personal computer 142 which calculates and displays the misconvergence amount as data in comparison with the input reference signal value.

Hereinafter, the convergence measuring method according to the present invention will be described in detail through the action of the convergence measuring device of the color cathode ray tube according to the present invention having the above-described configuration.

When the signal generator 110 is controlled by the control means 140, that is, the computer 142, the signal generator 110 forms a specific image pattern on the screen of the cathode ray tube 100 to be measured for convergence. And a signal of a specific image pattern generated from the signal generator 110 is scanned on the screen of the cathode ray tube 100 to form, for example, a cross hatch pattern as shown.

The first reflecting mirror 121 changes the image optical axis of the cathode ray tube 100 to the second reflecting mirror 122 and reflects the image by the second reflecting mirror 122. The optical axis is adjusted to an optimal focus state by the zoom lens 131 and input to the camera 132.

In this case, when the model of the cathode ray tube 100 is changed, the specific screen region, that is, the region of interest for measurement of convergence, is extracted according to the screen standard. Accordingly, since the image information resolution of the camera 132 for the convergence measurement region of interest is different from the image information resolution for the screen region of the existing model, the first reflecting mirror 121 and the second reflecting mirror ( 122) is controlled to change its posture in response to a model change of the convergence measurement target cathode ray tube.

On the other hand, the posture change of the first reflecting mirror 121 and the second reflecting mirror 122 is the actuator (operation) by the control means 140, that is, the computer 142 when the model of the cathode ray tube to be measured is changed. This is possible by controlling the driving of 124.

Image information of a specific screen region whose optical path is changed by the first reflection mirror 121 and the second reflection mirror 122 is adjusted to an optimal focus state by the zoom lens 131 and input to the camera 132. Image information input to the camera 132 is converted into an electrical signal by a signal converter 133 connected thereto. This signal is, for example, converted into a digital signal by a controller 141 such as a frame board, and stored in a memory of the personal computer 142. By calculating the amount of misconvergence by comparing with a reference signal value input in advance, The measured convergence results will be displayed on the monitor.

As described above, according to the method and apparatus for measuring convergence of a color cathode ray tube according to the present invention, the resolution of image information of a camera with respect to a region of interest for convergence measurement is changed in spite of a change in screen size caused by a model change of a cathode ray tube to be measured. By keeping it constant, the convergence measurement can be performed more precisely and easily, and the convergence measurement efficiency can be improved.

Claims (7)

Displaying a specific image pattern on the screen of the convergence measurement target cathode ray tube by the image pattern signal generating means; An imaging area dividing step of selecting a specific screen area of the cathode ray tube and extracting image information of an image pattern on the screen area using an optical system including a mirror; Inputting image information on the image pattern extracted in the imaging area dividing step into image input means; A signal conversion step of converting the image information of the image pattern input to the image input means into an electrical signal by a signal conversion means; And And a convergence measurement step of calculating a misconvergence amount as data by comparing a signal output from the signal conversion step with a pre-input reference signal value through a control means. The method of claim 1, wherein in the imaging area division step, Splitting and extracting the image information of the region of interest of the convergence measurement through two reflection mirrors which can change the posture in response to the change of the screen size of the cathode ray tube to be measured, and change the path of the image light and input it to the camera. A method for measuring convergence of colored cathode ray tubes. A signal generator for generating a signal for displaying a specific image pattern on a screen of the convergence measurement target cathode ray tube; Image pickup area dividing means for selecting a specific screen area of the cathode ray tube and extracting image information of an image pattern with respect to the screen area; Image input means for inputting image information on an image pattern of a specific screen region extracted by said imaging region dividing means; A signal converter for converting the image information of the image pattern input by the image input means into an electrical signal; And Control means for controlling the signal generator to form a specific image pattern on the screen of the cathode ray tube, and calculating and displaying the amount of misconvergence as data by comparing the signal input from the signal converter with a reference signal value previously input; A device for measuring the convergence of a color cathode ray tube, comprising: a. The method of claim 3, And said imaging area dividing means comprises two reflecting mirrors arranged to change the image optical axis of the cathode ray tube in a specific path to a specific path. The method of claim 3, The reflection mirror is a convergence measuring device of a color cathode ray tube, characterized in that the posture is installed so that the attitude can be changed by driving the actuator so as to reflect the incident optical axis in a plurality of paths. The method of claim 3, And said image input means is a camera having a zoom lens capable of focusing image information on an image pattern of a specific screen region extracted by said image capturing region dividing means. The method of claim 3, The control means includes a controller for converting a signal input from the signal converter into a digital signal, and a personal computer for calculating and displaying a misconvergence amount as data by comparing the digital signal converted by the controller with a reference signal value input in advance. Color cathode ray tube convergence measuring apparatus comprising a.