JPH04172095A - Picture correcting device - Google Patents

Abstract

PURPOSE:To correct accurately and to make a display device no adjustment by providing a transparent photoelectric converting element on a screen, and forming various correcting waveforms by the detecting signal of the position and the amount of an electronic beam and light. CONSTITUTION:A synchronizing signal is inputted in an input terminal 50, a correcting current is prepared in a deflection part 4 then supplied to a deflection yoke 46 or a convergence yoke 44, and a scanning speed is controlled. On the other hand, a video signal is inputted in an input terminal 48, and various signal processes or an amprifications for driving the cathode electrode of a cathode-ray tube 40 are executed in a signal processing part 5. And regarding a picture on the screen of the cathode-ray tube 40, the position or the amount of the electronic beam is taken out on a transparent photoelectric converting element surface 1 where plural pohotoelectric converting elements 11 are arranged by an electric signal. Next, from this detecting signal, the optimum correcting wafeveform correcting the convergence, a geometrical distortion, a uniformity and the like is formed in a correting waveform preparing circuit 3. Thus, it is possible to realize the highly accurate correction and the no adjustment of the display device.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a device for correcting a color television receiver, and more particularly to an image correction device that automatically performs various corrections.

2. Description of the Related Art Generally, in a video projector that uses three projection tubes that emit three primary colors to project enlarged images onto a screen, the angle of incidence of the projection tubes on the screen (hereinafter referred to as the concentration angle) is
Because each projection tube is different, color shift, focus shift, and deflection distortion may occur on the screen.

A change in brightness occurs. These various types of corrections are performed by creating an analog correction waveform in synchronization with the horizontal and vertical scanning cycles, and adjusting the size and shape of this waveform, but there are problems with correction accuracy. be. Furthermore, since various corrections are performed manually by visually observing the deviations on the screen, there is a problem that adjustment time is required. Therefore, as a method with high convergence accuracy,
The digital convergence device disclosed in Japanese Patent Application Laid-open No. 8114 is also used as a method for automatically correcting deflection distortion.
An electron beam deflection control device is proposed in Japanese Patent No. 24186.

14th rllJ shows a block diagram of a conventional image correction device capable of automatic correction. A detector 60 detects the electron beam position from the index phosphor coated on the surface of the shadow mask 43.
The processing device 66 generates signals for convergence correction and geometric distortion correction from this detection signal.

Signals from the processing device 66 are supplied to the waveform generator 52, which generates each scanning waveform for driving the convergence yoke 44 and the deflection yoke 46, so that convergence and geometric distortion can be automatically corrected.

As described above, electron beam position control such as convergence and geometric distortion can be automatically corrected.

Problems to be Solved by the Invention However, in the image correction device having the above-mentioned configuration, it is difficult to input various correction data such as focus deviation and luminance unicolor linearity other than correction of color deviation and geometric distortion on the screen. Since this is necessary, there is a problem in that it takes a very long time for adjustment. Furthermore, since the index phosphor is coated on the shadow mask surface within the cathode ray tube, a special cathode ray tube is required, and there are problems in that detection errors occur due to thermal deformation of the shadow mask surface.

In view of this, the present invention provides a transparent photoelectric conversion element on the screen, detects the position and amount of electron beams and light, and automatically corrects it, thereby achieving highly accurate correction and greatly shortening adjustment time. An object of the present invention is to provide an image correction device for a CRT display device that is capable of correcting an image of a CRT display device.

Means for Solving the Problems The invention according to claim 1 provides a plurality of transparent photoelectric conversion elements at predetermined positions on a display screen, detects the position and amount of electron beams or light, and according to the detection signal, A means for generating and correcting a correction waveform for correcting the position and amount of the electron beam or light of the display means is provided.

The invention according to claim 2 includes means for detecting the aspect ratio (aspect ratio) on the screen and generating a correction waveform.

The invention according to claim 3 provides a transparent photoelectric conversion element at a predetermined position on the display screen, constantly detects the position and amount of the electron beam or light, and changes the position and amount of the electron beam or light according to this detection signal. A means for generating and correcting a correction waveform is provided.

The invention according to claim 4 includes means for controlling the image contrast by detecting the level of the video signal on the screen and the incident light.

According to the invention described in claim 1.2, a transparent photoelectric conversion element is provided on the screen to detect the position and amount of the electron beam or light,
By creating various correction waveforms using this detection signal, highly accurate correction and no adjustment of the display device can be achieved.

It is also possible to automatically correct various aspect ratios.

According to the invention described in claim 3.4, a transparent photoelectric conversion element is provided on the screen, the position and amount of the electron beam or light are constantly detected, and various correction waveforms are automatically tracked using this constant detection signal. By creating and correcting it with high accuracy, it is possible to automatically correct for drifts, fluctuations, etc., making it possible to completely eliminate the need for adjustment of the display device. In addition, it is possible to automatically correct for optimal contrast in response to changes in the video signal level or incident light.

Examples Examples of the present invention will be described below with reference to the drawings. 1 to 7 show a block diagram and a screen diagram of an image correction apparatus according to a first embodiment of the present invention. In FIG. 1, 48 is an input terminal to which a synchronization signal is supplied, 4 is a deflection unit for creating a deflection waveform synchronized with the synchronization signal from input terminal 50, 48 is an input terminal to which a video signal is supplied, and 5 1 is a signal processing unit for controlling the amplitude of the video signal from the input terminal 48, and 1 is a plurality of photoelectric conversion elements 11 for detecting the positional amount of the electron beam and light on the screen of the cathode ray tube 40. Transparent photoelectric conversion element surface configured,
2 is a detection unit for detecting the position and amount of light from the electronic signal from the photoelectric conversion element 11, and 3 is for creating a correction signal for correcting the position and amount of light from the detection signal from the detection unit 2. This is a correction waveform creation section for

The operation of the image correction apparatus of this embodiment configured as described above will be described below. A synchronizing signal is input to the input terminal 50, and a correction current for scanning the screen in the deflection section 4 is generated and supplied to the deflection yoke 46 and the convergence yoke 44 to control the scanning speed. Input terminal 4
A video signal from 8 is input, and a signal processing section 5 performs various signal processing and amplification to drive a cathode electrode of a cathode ray tube (hereinafter referred to as CRT) 4. The image projected on the screen of the cathode ray tube 40 is photoelectrically converted into the position and amount (level) of the electron beam (light) on a transparent photoelectric conversion element surface on which a plurality of photoelectric conversion elements are arranged, and is extracted as an electrical signal. It can be done. The shape of this photoelectric conversion element is a 7-shaped shape so that the position in each scanning direction can be detected. The position and amount of the photoelectrically converted signal are detected and measured by the detection unit 2, and from this detection signal, the correction waveform creation unit 3 creates an optimal correction waveform for correcting convergence, geometric distortion, uniformity, etc. ing. The correction waveform from the correction waveform creation section 3 is supplied to a deflection section 4 for controlling scanning and a signal processing section 5 for controlling signal amplitude, etc., and is corrected.

As described above, various corrections can be automatically performed by detecting the position and amount of the electron beam on the screen and determining various correction waveforms using the detected signals.

Next, in order to explain the control means in detail, the block diagram of FIG. 2 and the waveform diagram of FIG. 3 will be used. The detection unit 2 includes a photoelectric conversion element 11, a feature extraction circuit 12, and a measurement circuit 13, and the deflection unit 4 detects screen amplitude.

It is composed of a deflection distortion correction circuit 9 and a convergence correction circuit 10, and the signal processing section 5 is composed of a uniformity correction circuit 6, a DC regeneration control circuit 7, and a gain control circuit 8. Figure 3 tel shows the overall configuration diagram of the photoelectric conversion element 11 coated on the transparent photoelectric conversion element 1, and its enlarged view is shown in Figure 3 ta.
), the photoelectric conversion element 11 has a seven-figure shape. When the test signal 14°15 on the photoelectric conversion element 11 shown in FIG. 3 (al) is projected, the photoelectric conversion signal has the waveform shown in FIG. 3 (dl.
The photoelectrically converted signal is supplied to the feature extraction circuit 12, where the position and level of the signal are extracted and input to the measurement circuit 13. The measurement circuit 13 measures the timing and level of the reference signal (FIG. 3 (al signal 14)) and the focused signal (FIG. 3 (al signal 15)).

When performing position measurement such as vertical convergence in Tal in the same figure, measure the positional deviation amount t1 between the reference signal (G signal) and the focused signal (RB multiplied signal) as shown in ibl in the same figure. Similarly, when performing position measurement such as TCI in the same figure, the positional deviation amount t2 of the reference signal (G signal) and focused signal (RB double signal) is measured. Next, when measuring the level, As shown in dl, the level v1 of the reference signal and the level v2 of the focused signal of the photoelectrically converted signal are measured.The signal from the measurement circuit 13 whose positional deviation amount and level have been measured is sent to the correction waveform creation section 3. This data is supplied to create various correction waveforms.From the data that measures the amount of positional deviation, correction waveforms are created to control convergence and deflection distortion per screen amplitude, and from the data that measures the amount of level. , a correction waveform for controlling the DC reproduction system, signal amplitude, uniformity, etc. is created.The correction waveform caused by the positional deviation amount from the correction waveform creation section 3 is as follows.
Convergence circuit 10 and screen amplitude and deflection distortion correction circuit 9
is supplied to control the raster. Correction waveform creation section 3
The correction waveform resulting from the level amount is supplied to the signal processing section 5 composed of a uniformity correction circuit 6, a DC reproduction control circuit 7, and a gain control circuit 8 to control the video signal level.

In addition, in the present invention, the correction means for only the representative point has been explained as shown in FIG. 3, but in order to correct the entire screen, information from each photoelectric conversion element 11 shown in FIG. By doing so, dynamic correction can be realized. The amount of positional deviation can be determined by the digital convergence method as described in the conventional example, and the basic block diagram thereof is shown in FIG. Its configuration includes an address generation circuit 16 for creating various address signals from synchronization signals, and a memory 17 for storing data of each correction point.
, an interpolation circuit 18 for performing data interpolation between correction points, and a D/D converter for converting interpolated data into analog quantities.
A converter 19 and LPF for smoothing the analog quantity
(low-pass filter) 20. Also, when detecting and correcting the level amount, similar to the concept of the digital convergence method described above, multiple correction points are provided within the screen, and the amplitude of the video signal is corrected using data interpolated between the correction points. Since dynamic uniformity correction can be performed by doing so, the explanation will be omitted.

As described above, the deflection unit 4 uses correction waveforms for deflection linearity so that the display area of each color is positioned uniformly over the entire screen,
Deflection correction is performed using screen amplitude correction data to drive the deflection coil. In addition, convergence correction is performed using color shift correction waveforms and data so that the display area of each color is located in the same position over the entire screen, and the convergence yoke is driven. In addition, the signal processing unit 5 performs brightness correction using a correction waveform for brightness reduction so that the display area of each color has uniform brightness (brightness) over the entire screen, and correction data for brightness, brightness, and image quality adjustment. Supplied to CRT.

In addition, the focus system correction section performs refocus correction using data and correction waveforms for defocusing so that the display area of each color has a uniform focus (resolution) over the entire screen, and drives the focus coil.

Next, the configuration diagram of FIG. 5 will be used to explain the detection means in detail. FIG. 5 shows the configuration of a cathode ray tube in which a transparent photoelectric conversion element surface is installed. In Figure 5, 21 to 23
are three primary color electron guns, 24 is a shadow mask surface, and 25 is a phosphor mosaic surface on the panel, which is similar to a general shadow mask type CRT configuration, and in the present invention, this CRT
A transparent photoelectric conversion element surface 1 composed of a transparent photoelectric conversion element is attached to the display surface from the outside to detect image display information. The structure of the photoelectric conversion element includes, for example, a photoelectric conversion element that converts optical information into an electrical signal, a piezoelectric conversion element that converts optical information into pressure information, and then converts the pressure information into an electrical signal.

Next, in order to explain a method of detecting an aspect ratio corresponding to a display area and creating various correction data using this detection signal, the screen diagram and correction waveform diagram of FIG. 6 will be used.

The amount of correction for the aspect ratio shown by the solid line in Figure 6 (al) is as shown in Figure 6 (b), and for the aspect ratio shown by the broken line in Figure 6 (al), the amount of correction is the same because the spatial position changes. (The correction amount v4 for bl is sufficient. Therefore, the aspect information is transferred from the video signal on the screen to the photoelectric conversion element 11.
The detection signal controls corrections caused by the aspect ratio. The H deflection amplitude correction data from the correction waveform creation section 3 shown in FIG. 2 is supplied to the horizontal deflection circuit of the deflection section 4, and the horizontal amplitude is controlled by controlling the power supply voltage. Corrections caused by horizontal amplitude are humpersence, focus, and brightness corrections, and each correction waveform is
Convergence within 0.

It is supplied to each control circuit for focus and brightness correction.

If each correction waveform at aspect ratio 1629 shown in Fig. 6 (al) is a horizontal sawtooth waveform with an amplitude of 3 as shown in (b), the horizontal amplitude as shown in the broken line in Fig. 1a) When the aspect ratio is lowered and the aspect ratio is set to 1:1, the amount of spatial correction on the screen is large, resulting in convergence, focus shift, and brightness changes. Therefore, for other correction data caused by the horizontal amplitude, optimum correction data is obtained in the correction waveform creation section 3, and this correction data is supplied to each control circuit to create a correction waveform corresponding to the horizontal amplitude. As shown in FIG. 5 (C1), a correction waveform of amplitude 2 corresponding to the amplitude is automatically output.

Next, in order to explain in detail the relationship between the related control systems corresponding to the display areas, the control system related diagram shown in FIG. 7 will be used. As shown in Fig. 7, which shows the relationship between the display area and related control system, as mentioned above, the deflection amplitude is related to convergence, focus, brightness correction, deflection distortion, and beam current, and the screen phase is related to: DC playback and BLK are related.

Next, in the case where the correction data of the related control system is corrected at the same time, the data whose aspect ratio is detected by the detection section 2 in FIG. 3 is supplied to the correction waveform creation section 3, and the correction data of the related control system is also corrected. controlled at the same time.

Therefore, by simply writing the basic aspect ratio correction data once, other correction systems caused by changes in the display area are automatically corrected.

As described above, according to this embodiment, a transparent photoelectric conversion element is provided on the screen, the position and amount of electron beams and light are detected, and various correction waveforms are created using the detection signals.
It is possible to achieve highly accurate correction and no need to adjust the display device.

Furthermore, since the photoelectric conversion element can be attached from outside the CRT, a special CRT is not required, and detection errors due to thermal deformation of the shadow mask do not occur, so highly accurate correction can be achieved. Furthermore, it is possible to easily deal with changes in the number of correction points.

In addition, by simultaneously controlling the correction data caused by the aspect ratio (display area), even if the screen amplitude or phase is controlled, it is automatically corrected, eliminating the need to make adjustments each time, and significantly reducing the adjustment time. It is possible to shorten the time.

In addition, by setting a plurality of adjustment points on the screen and creating a correction waveform by interpolating data between the adjustment points, stable and highly accurate correction can be achieved.

A second embodiment of the present invention is shown in FIGS. 8 to 13. The difference from the configuration of the first embodiment is that information at a predetermined position on the screen is constantly detected and automatic tracking type correction is performed. In FIG. 8, 26 is a photoelectric conversion element provided outside the effective screen on the screen, 28 is a detection unit for constantly detecting the position and amount of light from the electronic signal from the photoelectric conversion element 6, and 3 is the above-mentioned photoelectric conversion element. This is a correction waveform creation section for creating a correction signal for correcting the position and amount of light from the detection signal constantly output from the detection section 2. In FIG. 8, components that perform the same operations as those in the first embodiment are designated by the same numbers and their explanations will be omitted.

In order to explain the image correction apparatus of this embodiment in detail, the block diagram in FIG. 9 and the waveform diagram in FIG. 10 will be used. As shown in the layout diagram of the photoelectric conversion element in FIG. 8 (bl), two points outside the effective screen are provided, and a test signal for detection is projected at those positions to perform constant detection.

In the first embodiment, the test signal is displayed on the entire screen and dynamic correction is automatically performed using this information, but in the second embodiment of the present invention, the test signal is constantly displayed outside the screen. This information is used to automatically correct static fluctuation components such as drift and fluctuation. The detection unit 27 includes the photoelectric conversion element 11 and the feature extraction circuit 12
The deflection unit 29 includes a screen amplitude correction circuit 31 and a static convergence correction circuit 30, and the signal processing unit 5 includes a DC reproduction control circuit 7 and a gain control circuit 8. For the test signal projected outside the screen, a test signal superimposition period is provided at the final period of one vertical scanning period or one horizontal scanning period, and the pattern signal is displayed during this period.

Therefore, since it does not affect the video signal during the effective scanning period,
Constant detection and correction becomes possible.

FIG. 10(e) shows an overall configuration diagram of the photoelectric conversion element 11 coated on the transparent photoelectric conversion element 1, and an enlarged view thereof is shown in FIG.
As shown in Figure (a), the photoelectric conversion element 11 is installed at a position outside the screen and has a seven-figure shape. The test signal 32 is always on the photoelectric conversion element 11 shown in FIG.
．． 33 is displayed, the photoelectric conversion signal has the waveform shown in FIG. It is constantly extracted and input to the measurement circuit 13.

The measuring circuit 13 receives the reference signal (signal 32 in FIG. 10(a)).
) and the focusing signal (signal 33 in FIG. 10 (al)) and the timing and level are measured.

When performing position measurement such as vertical convergence of the same figure (al), as shown in figure 1bl, measure the positional deviation amount t3 between the reference signal (G signal) and the focused signal (RB multiplied signal. Also, in the horizontal direction When performing position measurements such as convergence, the positional deviation amount t4 between the reference signal (G signal) and focused signal (RB multiplied signal) is similarly measured as shown in Figure 1c).Next, when measuring the level, the same As shown in FIG. 1dl, the level v3 of the reference signal and the level v4 of the focused signal of the photoelectrically converted signal are measured.The signal with the measured positional deviation amount and level from the measurement circuit 13 is sent to the correction waveform creation unit 3. is supplied to the system, and creates various correction waveforms.From the measured positional deviation amount, raster system correction waveforms are created to control static convergence, screen amplitude, etc.
The signal is supplied to a static convergence circuit 30 and a screen amplitude correction circuit 31 to control the raster. From the measured level amount data, a signal system correction waveform for controlling the DC regeneration system, signal amplitude, etc. is created, and the signal system correction waveform is supplied to the signal processing section 5 composed of the DC regeneration control circuit 7 and the gain control circuit 8. to control the video signal level.

Next, in order to explain a method of controlling the image contrast by changing the transmittance of the detection surface depending on the level of the video signal and the light incident on the screen, the configuration diagram in FIG. 11 and the characteristic diagram in FIG. 12 will be used. A configuration diagram is shown in FIG. 11 la, in which a transmittance control surface 34 is provided outside the transparent photoelectric conversion element 1 for detecting the position and amount of the electron beam. The same figure (bl
shows its detailed configuration diagram. The electron beam from the electron gun passes through the shadow mask surface and is irradiated onto the fluorescent screen. This RGB image light is incident on the transmittance control surface 34 through the transparent charge conversion element 1. The transmittance control surface 34 is composed of a liquid crystal device or the like, and is an element whose transmittance can be controlled according to the amount of charge. Fig. 12 1a) The solid line shows a characteristic diagram showing the relationship between vertical illuminance (indoor illumination light) and contrast. The indoor illumination light shown in FIG. 13 (b) is detected by the transparent photoelectric conversion element surface 1, and the transmittance control surface 34 is controlled by this detection signal to improve contrast reduction. As shown in the characteristic diagram showing the relationship between illuminance and transmittance, when the vertical illuminance increases, the transmittance of the image light is lowered to prevent a decrease in contrast due to the influence of external light.At this time, the vertical illuminance and The contrast relationship is shown in Figure 12 (al dashed line), which makes it possible to significantly improve the contrast.In addition, by detecting the level of the video signal and controlling the signal processing section using this detection signal, each video signal is Contrast improvement can be achieved.

Next, the block diagram of FIG. 13 will be used to explain the operation in detail. In FIG. 13, 34 is a transmittance control surface for controlling the transmittance of image light, 35 is an external light detection section for detecting external light such as indoor lighting that enters the screen, and 36 is the transmittance control surface. The surface 34 is a transmittance control section for controlling. The vertical illuminance is detected by the external light detection section 35 provided with the transparent photoelectric conversion element surface 1, and this detection signal is supplied to the transmittance control section 36. In the transmittance control section 36,
For example, by creating a control signal for controlling the transmittance control surface 34 composed of a liquid crystal device and controlling the transmittance control surface 34, the contrast shown by the broken line in FIG. 12(a) is achieved. .

Further, the external light detection signal and image signal from the external light detection section 35 are supplied to a correction waveform creation section 28 to create a correction waveform for signal processing. Note that although the external light detection unit 35 detects light from opposite directions (external light and image light), it goes without saying that this can be set arbitrarily depending on the method of attaching the detection element. Furthermore, since only one point on the screen is sufficient for external light detection, most of the rest is used for image detection. The correction waveform from the correction waveform creation section 28 is supplied to the signal processing section 5, and is set to the optimum black level and white level in accordance with external light and image signals. Therefore, a contrast suitable for the image signal is automatically set.

As described above, according to this embodiment, a transparent photoelectric conversion element is provided on the screen, the position and amount of electron beams and light are constantly detected, and various correction waveforms are automatically tracked using this constant detection signal. By creating and correcting it, it is possible to automatically correct for drifts, fluctuations, etc. with high precision, making it possible to completely eliminate the need for adjustment of the display device. In addition, it is possible to automatically correct for optimal contrast in response to changes in the video signal level or incident light.

In the first and second embodiments, a display device using a CRT has been described for ease of understanding, but it goes without saying that the present invention is also effective for other display devices.

Further, in the first embodiment, a case has been described in which the detection elements are arranged at positions corresponding to each adjustment point, but a smaller number may be set and data interpolation may be performed.

Further, in the second embodiment, a case has been described in which a liquid crystal is used as a device for controlling transmittance, but other devices may be used as long as the device can control transmittance.

As described in detail of the invention, according to the invention described in claim 1.2,
A transparent photoelectric conversion element is installed on the screen to detect the position and amount of electron beams and light, and this detection signal is used to create various correction waveforms, achieving highly accurate correction and eliminating the need for adjustments to the display device. can. Furthermore, since the photoelectric conversion element can be attached from outside the CRT, a special CRT is not required, and detection errors due to thermal deformation of the shadow mask do not occur, so highly accurate correction can be achieved. Furthermore, it is possible to easily deal with changes in the number of correction points.

In addition, by simultaneously controlling the correction data caused by the aspect ratio (display area), even if the screen amplitude or phase is controlled, it is automatically corrected, eliminating the need to make adjustments each time, and significantly reducing the adjustment time. It is possible to shorten the time. In addition, by setting a plurality of adjustment points on the screen and creating a correction waveform by interpolating data between the adjustment points, stable and highly accurate correction can be achieved.

Further, according to the invention described in claims 3 and 4, a transparent photoelectric conversion element is provided on the screen, the position and amount of the electron beam or light are constantly detected, and various correction waveforms are automatically tracked using this constant detection signal. By creating and correcting with a mold, it is possible to automatically correct the image while it is being projected, so it is highly accurate and can also automatically correct for drifts and fluctuations, so there is no need to make any adjustments to the display device. can be realized. In addition, it is possible to automatically correct for optimal contrast in response to changes in the video signal level or incident light.

[Brief explanation of drawings]

Figure 1 1a1. (bl is a screen diagram of a block diagram of an image correction device according to an embodiment of the present invention, FIG. 2 is a block diagram for explaining the operation of the same embodiment, and FIGS. 3(a) to (e)
) are waveform diagrams and screen diagrams to explain the operation of the same example,
FIG. 4 is a block diagram for explaining the operation of the embodiment;
FIG. 5 is a configuration diagram for explaining the operation of the same embodiment, and FIG.
Figures (a) and (bl are diagrams of the relationship between the display area and related control system of the dynamic embodiment of the same embodiment, and Figures (a) and (bl are blocks of the image correction device of the second embodiment of the present invention) Figure 2 screen diagram,
FIG. 9 is a block diagram for explaining the operation of the embodiment;
10 (a) to (el are waveform diagrams and screen diagrams for explaining the operation of the same embodiment, FIG. 1 1al, (b) is a configuration diagram for explaining the operation of the same embodiment, Figure (al,
lbl is a characteristic diagram for explaining the operation of the same embodiment, FIG. 13 is a block diagram for explaining the operation of the same embodiment,
FIG. 14 is a block diagram of an image correction device in a conventional video projector. 1... Transparent photoelectric conversion element, 2... Detection section, 3... Correction waveform creation section, 4... Deflection section, 5...・Signal processing unit, 6... Uniformity correction circuit, 7... DC reproduction control circuit, 8... Gain control circuit, 9... Screen amplitude, Deflection distortion correction circuit, 10... Convergence correction circuit, 11... Photoelectric conversion element, 12...
...Feature extraction circuit, 13...Measurement circuit. Name of agent: Patent attorney Haruaki Koebi and 2 others/--Issho@
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Claims (4)

[Claims] (1) Display means for displaying image reception information of a color television receiver; and detection for detecting the position and amount of electron beams or light by providing a plurality of transparent photoelectric conversion elements at predetermined positions on the display image of the display means. and generating means for generating a correction waveform for correcting the position and amount of the electron beam or light of the display means in accordance with the detection signal from the detection means, the output from the generation means generating the correction waveform for correcting the position and amount of the electron beam or light of the display means. Image correction device driven means. 2. The image correction apparatus according to claim 1, wherein the detection means detects an aspect ratio on the screen, and generates a correction waveform based on this detection signal. (3) A display means for displaying image reception information of a color television receiver, and a detection means for constantly detecting the position and amount of electron beams or light by providing a transparent photoelectric conversion element at a predetermined position on the display image of the display means. a projection means for projecting a test signal at a position where the light is received by the detection means; and a correction waveform for correcting the position and amount of the electron beam or light of the display means according to the detection signal from the detection means. an image correction device, comprising: a generating means for generating an image, wherein the display means is driven by an output from the generating means. (4) The image correction apparatus according to claim 3, wherein the detection means detects the level of the video signal and the light incident on the screen, and controls the image contrast based on this detection signal.