JPH0787423A - Compensation apparatus of projected image - Google Patents

Abstract

PURPOSE: To compensate geometrical distortion and chromatic aberration generated in projection images at the time of passing through an optical system beforehand. CONSTITUTION: A horizontal deflection correction circuit 74 changes horizontal deflection signals generated in a field sequential system color monitor and compensates the geometrical distortion and the chromatic aberration in a horizontal direction generated in the image fields of respective colors beforehand. Similarly, a vertical deflection correction circuit 76 changes vertical deflection signals generated in the field sequential system color monitor and compensates the geometrical distortion and the chromatic aberration in a vertical direction generated in the image fields of respective colors beforehand.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention corrects geometrical distortion and chromatic aberration in a field sequential color monitor in advance, and an image projected from the field sequential color monitor through an optical system. The present invention relates to a projection image compensating device that allows a person to see the image normally.

[0002]

BACKGROUND OF THE INVENTION Color head-up display systems have found a variety of commercial applications ranging from virtual reality research to flight simulators and video arcade games. ing. The principle of a color head-up display system is simple. The color head-up display system allows a projected image to be superimposed on a real image so that a user can see the projected image and the real image at the same time. In a typical color head-up display system,
A cathode ray tube (CRT) that generates a projected image and an optical system that brings the projected image into the visual field of the user are adopted. Two points are important in the market evaluation of color head-up display systems. That is, the cost of the entire system and the quality of the projected image (ie, brightness and chrominance).

[0003]

Presently, most color head-up display systems employ off-the-shelf optics with a field sequential color monitor and spherical achromatic lens. This is because it is more cost effective than using dedicated optics such as conventional color monitors and paraboloidal achromatic lenses. However, off-the-shelf optical systems, especially spherical achromatic lenses, produce geometric distortion and chromatic aberration in the projected image that passes through them, and are a distance from the achromatic lens. Geometric distortion is caused in the projected image projected on. The geometrical distortion in such an optical system is generally a pincushion distortion, but there is also a barrel distortion, a pincushion centering distortion, a parallelogram distortion, and an unequal quadrilateral distortion. On the other hand, chromatic aberration in an optical system is generally chromatic distortion.
Is. Therefore, it is necessary to compensate for these distortions.

The problems of geometric distortion and chromatic aberration of the projected image are currently solved by software. Specifically, the color head-up display system uses software to compensate for distortion and chromatic aberration due to the optical system of the projected image so that the user does not have distortion and chromatic aberration when viewing the projected image. However, when the geometrical distortion and chromatic aberration of the projected image are compensated by using software, a central processing unit (CPU) included in the image generation circuit in the display system is provided.
Requires a calculation time for compensation, which reduces the calculation time available for image generation.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a projection image compensating device capable of efficiently compensating for geometric distortion and chromatic aberration and enabling high-speed generation of a projection image. Another object of the present invention is to provide an inexpensive projection image compensating apparatus capable of compensating for geometric distortion and chromatic aberration occurring in a projection image that has passed through an optical system. Still another object of the present invention is to
It is an object of the present invention to provide a projection image compensator capable of compensating for geometric distortion and chromatic aberration that occur in a projection image projected at a distance from the lens of the optical system.

[0006]

SUMMARY OF THE INVENTION The present invention is a projection image provided in a field-sequential color monitor which is capable of independently pre-compensating for geometric distortion and chromatic aberration of the projection image with respect to each of horizontal and vertical. Compensation device More specifically, the horizontal deflection correction circuit modifies the horizontal deflection signal generated by the field sequential color monitor to pre-compensate most of the horizontal geometric distortion and chromatic aberration occurring in the image field of each color. To do. Similarly, the vertical deflection correction circuit is a field sequential color
The vertical deflection signal produced by the monitor is modified to pre-compensate for most of the vertical geometric distortion and chromatic aberration that occurs in each color image field.

The field sequential color display system produces horizontal and vertical deflection signals and dynamic image size signals for each of the associated three color image fields to form one image frame. The field-sequential color display system projects one image field out of the associated three-color image field onto a screen of a cathode ray tube (CRT) in the system in order and forms an image frame on the screen. To do. C
The associated three-color image field, which is sequentially projected on the screen of the RT, is accumulated as an afterimage on the retina of the user's eye to form one multicolor image frame. The three-color image field is a red image field, a green image field, and a blue image field that form an image frame.

The horizontal deflection correction circuit is composed of a geometric distortion correction circuit, an image size circuit and an image centering circuit. The geometric distortion correction circuit allows the user to consider the effect of horizontal geometric distortion. Specifically, the squaring circuit generates a parabolic vertical deflection signal from the vertical deflection signal. The user can add a part of the vertical deflection signal to the horizontal deflection signal by each of the first and second variable resistors, and can correct the parallelogram distortion and the unequal quadrilateral distortion in the horizontal direction, respectively. Similarly, the user can add a portion of the parabolic vertical deflection signal to the horizontal deflection signal with each of the third and fourth variable resistors to provide horizontal (left and right) pincushion centering distortion and pincushion type. You can compensate for each distortion. The term "partial" as used herein may be the total amount of related signals, and changes the horizontal and vertical deflection signals within plus or minus about 20%.

The image size circuit allows the user to select a horizontal image size (size) for each of the associated three color image fields, thus ensuring that the size of each color image field projected on the CRT is the same. can do. Specifically, the image size circuit has a summing means and a fifth variable resistor so that the user can add a portion of the horizontal image size reference signal to the horizontal deflection signal. The summing means includes a horizontal deflection signal, a portion of the vertical deflection signal from the second variable resistor, a portion of the parabolic vertical deflection signal from the fourth variable resistor, the dynamic image size signal and the fifth variable resistor. An image size signal is generated by combining a part of the horizontal image size reference signal.

Similarly, the image centering circuit allows the user to horizontally position the image with respect to each of the associated three color image fields, thus allowing each color image field of the image frame to have the remaining image fields of that image frame. Can be overlaid. In particular,
The image centering circuit has a summing means and a sixth variable resistor so that the user can add a portion of the horizontal image centering reference signal to the horizontal deflection signal. The summing means associated with the image centering circuit includes a horizontal deflection signal, a portion of the vertical deflection signal from the first variable resistor, a portion of the parabolic vertical deflection signal from the third variable resistor and the sixth variable resistor. The image centering signal is generated by synthesizing a part of the horizontal image centering reference signal. Finally, another summing means synthesizes the image size signal and the image centering signal to generate a corrected horizontal deflection signal and supplies it to the yoke of the CRT.

Similarly, the vertical deflection correction circuit includes an integration circuit,
It is composed of a geometric distortion correction circuit and a multiplication circuit. The integrating circuit generates an integrated horizontal deflection signal from the horizontal deflection signal. The user can consider the influence of vertical geometric distortion by the geometric distortion correction circuit. Specifically, the user can add a part of the horizontal deflection signal to the vertical deflection signal by each of the first and second variable resistors, and the vertical parallelogram distortion and the unequal quadrilateral distortion signal can be added. Can be corrected respectively. Similarly, the user can add a portion of the integrated horizontal deflection signal to the vertical deflection signal by means of each of the third and fourth variable resistors, which allows vertical (up and down) pincushion centering distortion and pincushion distortion. Can be compensated respectively.
The first summing means synthesizes a part of the horizontal deflection signal from the second variable resistor and the integrated horizontal deflection signal from the fourth variable resistor to generate a first corrected horizontal deflection signal.

The multiplication circuit generates a composite vertical deflection signal from the first corrected horizontal deflection signal and the vertical deflection signal. The second summing means generates a modified vertical deflection signal from a part of the horizontal deflection signal from the first variable resistor, a part of the integrated horizontal deflection signal from the third variable resistor and the composite vertical deflection signal. Finally, the standard vertical deflection circuit generates a corrected vertical deflection signal to be supplied to the yoke of the CRT from the vertical deflection signal, the dynamic image size signal and the changed vertical deflection signal.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 4 is a view of a color head-up display system 2 over a user's head 4. The color head-up display system 2 has two cathode ray tubes (CRTs, not shown) mounted in a substantially rectangular image box 6. The video box 6 includes video synthesizers 8 and 1
It is placed on top of 0. As shown in FIG. 1, a video synthesizer 8
Each of 10 and 10 is placed in the field of view of the user's eye 94, along with the achromatic lens 92. The color head-up display system 2 further includes a substantially rectangular acoustic box 12 arranged on the back of the user's head. It controls the sound and delivers it to the user's ear (not shown) via a pair of high quality storable earphones. Power and necessary information to the video box 6 and the audio box 12 are supplied from the audio box 12 to the video box 6 via a thin cable 14 wired.

Cathode ray tube (CRT) in the picture box 6
Projects an image on the video synthesizers 8 and 10, respectively. The image synthesizers 8 and 10 are devices that reflect a part of light and transmit a part of the light, and superimpose and combine an image projected by a CRT on a real image spreading in front of the user's eyes. The achromatic lens 92 (see FIG. 1) typically magnifies the superimposed projection and real image by a factor of 10 to 100. The video synthesizers 8 and 10 and the achromatic lens 92 allow both projection and real images to be viewed simultaneously. In the color head-up display system 2, the projected image is generated by the field sequential method. That is, each of the related fields of the three colors is sequentially and continuously projected onto the screen 90 of the CRT 86, and one image frame is formed on the screen 90 of the CRT 86. By successively and sequentially projecting the associated three-color image field on the screen of the CRT, the afterimage on the retina of the user's eye 94 is integrated to form one multicolor image frame. The three color related image fields are the red image field, the green image field and the blue image field, which together form a multicolor image frame.

On the left and right side surfaces of the video box 6 of the color head-up display system 2, various video compensation setting devices 16 for compensating and fine-adjusting a projected image generated by a CRT (not shown) are provided. . A similar sound compensation setting device (not shown) for compensating and finely adjusting the sound to the user is provided on the other left and right side surfaces of the video box 6.

FIG. 5 is a diagram showing in more detail various image compensation setting devices 16 for compensating and finely adjusting the projected image. The image compensation setting devices 16 are grouped according to whether they are related to a vertical image or a horizontal image. Both vertical and horizontal images are modified with the same number and type of compensation setting devices. The compensation setting device itself is a small adjusting screw from a mechanical point of view, and electrically adjusts variable resistors in various correction circuits as described later. Each compensation setting device can change the magnitude of the horizontal and vertical deflection signals only within plus or minus about 20%.
The correction device is related to both the horizontal image and the vertical image, and the numbers in the figure of each compensation setting device are as shown in Table 1.

[0017]

[Table 1]

FIG. 1 is a block diagram of the circuitry of a field sequential color display system for producing a projected image within the color head-up display system 2. The circuit shown in FIG. 1 pertains to one of the two CRTs described above with respect to FIG. The same circuit is used for the circuit related to the other CRT.

The color head-up display system 2 shown in FIG. 4 has a seventh variable resistor 54 and an eighth variable resistor 58 between the voltage source (reference voltage source V) and the multiplexer 60. is doing. Seventh variable resistor 54 and eighth
The variable resistor 58 adjusts the color of the red image field and the color of the blue image field, respectively, and also adjusts the color correction setting devices 30 and 32 of the red image field and the color correction setting device 26 of the blue image field shown in FIG. 5, respectively. And 28.

The color head-up display system 2 is
The field sequential video signal is placed on the signal line 50 and supplied to the synchronizing circuit 52. The field sequential video signal is
A video signal containing horizontal and vertical sync signals which are composite sync signals and pixel information for each of the three associated color and image fields sent together from the image frame. The synchronizing circuit 52 extracts the horizontal and vertical synchronizing signals from the field sequential system video signal, puts the horizontal synchronizing signal on the signal line 62 and supplies it to the horizontal raster generating circuit 64, and puts the vertical synchronizing signal on the signal line 66 to perform vertical rastering. It is supplied to the generation circuit 68. The synchronization circuit 52
Further, a color / image field signal is extracted from the field sequential system video signal, and a selection signal is placed on the signal line 70 and supplied to the multiplexer 60. This causes the multiplexer 60 to select one of the three associated color / image field sizes and place it on the signal line 72 as a dynamic image size signal for horizontal and vertical deflection correction circuits 74 and 76. Supply to both.

The horizontal raster generation circuit 64 receives the horizontal synchronizing signal and generates an uncorrected horizontal deflection signal from the horizontal synchronizing signal. This is a sawtooth waveform signal, typically 60-140 kHz. The horizontal raster generation circuit 64 puts the uncorrected horizontal deflection signal on the signal line 78 and outputs it to the horizontal deflection correction circuit 74.
And the vertical deflection correction circuit 76. Similarly, the vertical raster generation circuit 68 receives the vertical synchronization signal and generates an uncorrected vertical deflection signal therefrom. This is typically 1
It is a sawtooth waveform signal of 00 to 240 kHz. The vertical raster generation circuit 68 puts the uncorrected vertical deflection signal on the signal line 80 and supplies it to the horizontal deflection correction circuit 74 and the vertical deflection correction circuit 76.

The horizontal deflection correction circuit 74 receives both the uncorrected horizontal deflection signal and the dynamic image size signal,
A corrected horizontal deflection signal is generated from these signals, and the corrected horizontal deflection signal is placed on the signal line 82 and supplied to the yoke 84 of the CRT 86. The corrected horizontal deflection signal is supplied to the optical system of the color head-up display system 2, that is, the image synthesizers 8 and 10 and the achromatic lens 9.
This signal is obtained by previously compensating for horizontal geometrical distortion and horizontal chromatic aberration occurring in No. 2. More specifically, the corrected horizontal deflection signal is a signal that the user has previously compensated for the horizontal-related compensation shown in FIG. Similarly, the vertical deflection correction circuit 76 receives both the uncorrected vertical deflection signal and the dynamic image size signal, generates a corrected vertical deflection signal from them, puts them on the signal line 88, and supplies them to the yoke 84 of the CRT 86. The vertical deflection signal to be corrected is
This signal is a signal in which vertical geometric distortion and vertical chromatic aberration generated in the optical system of the head-up display system 2, that is, the image synthesizers 8 and 10 and the achromatic lens 92 are previously compensated. More specifically, the corrected vertical deflection signal is a signal that the user has previously compensated for the vertical-related compensation shown in FIG.

An electron gun (not shown) in the CRT 86 is turned on and modulated, and 3 in the color shutter (not shown).
The corresponding one image field of the associated three-color image field that has passed through the corresponding one of the color polarizers is projected onto the screen 90 in the CRT 86. In other words, the corrected vertical deflection signal and the corrected horizontal deflection signal control the deflection and sweep of the electron gun across the screen 90 of the CRT 86. The electron gun projects an image field of one of the associated three color image fields that has passed through a corresponding one of the three color deflectors onto a screen 90 in the CRT 86. High-speed sequential (continuous) projection of each of the associated three-color image fields onto the screen 90 within the CRT 86 will be perceived by the human eye as one multicolor image frame.

The multicolored one image frame produced on the screen 90 in the CRT 86 appears to the human eye as having geometric distortion and chromatic aberration. This is because this multicolor one image frame has previously compensated for the geometric distortion and chromatic aberration caused by the optical system which has not passed through yet, that is, the image synthesizers 8 and 10 and the achromatic lens 92. After the multicolor one image frame has passed through the video synthesizers 8 and 10 and the achromatic lens 92, it is perceived by the human eye 94 as a multicolor one image frame without geometric distortion and chromatic aberration.

FIG. 2 shows the horizontal deflection correction circuit 7 shown in FIG.
4 is a more detailed block diagram of FIG. The uncorrected vertical deflection signal on the signal line 80 is supplied to the squaring circuit 96 and the inverting circuit 98. The inverting circuit 98 inverts the uncorrected vertical deflection signal, puts it on the signal line 100, and supplies it to the squaring circuit 96. The first variable resistor 102 and the second variable resistor 104 are arranged between the signal lines 80 and 100, and correct the horizontal parallelogram distortion and the unequal quadrilateral distortion, respectively, and each of FIG.
It corresponds to the horizontal parallelogram distortion compensation setting device 34 and the horizontal unequal quadrilateral distortion compensation setting device 42 shown in FIG.

To further explain, the first variable resistor 102
Thus, the user can compensate the horizontal parallelogram distortion simply by turning the horizontal parallelogram distortion compensation setting device 34 (see FIG. 5). Horizontal parallelogram distortion compensation setting device 3
By such adjustment of 4, a part of the uncorrected vertical deflection signal or the inverted uncorrected vertical deflection signal is added to the image centering signal generated by the horizontal image centering circuit 106. The horizontal image centering circuit 106 will be described later. The "part" of the signal as used herein may be the entire amount of the signal, and changes the horizontal and vertical deflection signals within plus or minus about 20%. Similarly, the second variable resistor 104
Thus, the user can compensate for the unequal quadrilateral distortion simply by turning the horizontal unequal quadrilateral distortion compensation setting device 42 (see FIG. 5). By such adjustment of the horizontal unequal quadrilateral distortion compensation setting device 42, a part of the uncorrected vertical deflection signal or the inverted uncorrected vertical deflection signal becomes an image size signal generated by the horizontal image size (size) circuit 108. Is added. The horizontal image size circuit 108 will be described later.

The squaring circuit 96 squares both the uncorrected vertical deflection signal and the inverted uncorrected vertical deflection signal, and outputs the signal line 110.
A positive parabolic vertical deflection signal is generated above, and a negative parabolic vertical deflection signal is generated on the signal line 112, respectively. Third variable resistor 114 and fourth variable resistor 116
Are arranged between the signal lines 110 and 112 to compensate for the pincushion centering distortion and the pincushion distortion respectively, and the horizontal pincushion centering distortion compensation setting device 46 shown in FIG. 5 respectively.
And a horizontal pincushion distortion compensation setting device 38.

To explain further, the third variable resistor 114
Thus, the user can compensate for the horizontal pincushion centering distortion by simply turning the horizontal pincushion centering distortion compensation setting device 46 (see FIG. 5). By such adjustment of the horizontal pincushion centering distortion compensation setting device 46,
A portion of the positive or negative parabolic vertical deflection signal is added to the image centering signal generated by the horizontal image centering circuit 106. Similarly, the fourth variable resistor 116 allows the user to compensate for pincushion distortion by simply turning the horizontal pincushion distortion compensation setting device 38 (see FIG. 5). By such adjustment of the horizontal (left and right) pincushion distortion compensation setting device 38, a portion of the positive or negative parabolic vertical deflection signal is added to the image size signal generated by the horizontal image size circuit 108.

The fifth variable resistor 118 is arranged between the voltage source (V) and the horizontal image size circuit 108, and appropriately corrects the horizontal size (size) of the image and compensates the horizontal total image size. It corresponds to the setting device 22 (see FIG. 5). The fifth variable resistor 118 allows the user to change the horizontal size (size) of the entire image by simply turning the horizontal total image size compensation setting device 22 (see FIG. 5). By such adjustment of the horizontal total image size compensation setting device 22, a part of the horizontal image size reference signal (signal from the voltage source V) is added to the image size signal generated by the horizontal image size circuit 108. Horizontal image size circuit 108
Is a horizontal deflection signal on the signal line 78, the second variable resistor 10
4 of the vertical deflection signal, a portion of the parabolic vertical deflection signal of the fourth variable resistor 116, the dynamic image size signal on the signal line 72, and the fifth variable resistor 118.
An image size signal is generated by synthesizing the horizontal image size reference signals from, and is supplied to the summing circuit 122 on the signal line 120.

Similarly, the sixth variable resistor 124 is arranged between the voltage source (V) and the horizontal image centering circuit 106 to appropriately correct the center of the horizontal image (center position) and set the horizontal image centering compensation. It corresponds to the device 18 (see FIG. 5). The sixth variable resistor 124 allows the user to compensate for the horizontal centering (center position) of the entire image by simply turning the horizontal total image centering compensation setting device 18. By such adjustment of the horizontal image centering compensation setting device 18, a part of the horizontal image centering reference signal (signal from the voltage source V) is added to the image centering signal generated by the horizontal image centering circuit 106. Horizontal image centering circuit 106
Is a horizontal deflection signal on the signal line 78, the first variable resistor 10
A part of the vertical deflection signal from the second variable resistor 114, a part of the parabolic vertical deflection signal from the third variable resistor 114, and the horizontal image centering reference signal from the sixth variable resistor 124 are combined to generate an image centering signal. Then, it is placed on the signal line 126 and supplied to the summing circuit 122. Finally, the summing circuit 122
Composes the image size signal on the signal line 120 and the image centering signal on the signal line 126 to generate a corrected horizontal deflection signal, which is placed on the signal line 82 and placed on the yoke 84 of the CRT 86.
(See FIG. 1).

FIG. 3 shows the vertical deflection correction circuit 7 shown in FIG.
6 is a more detailed block diagram of FIG. The uncorrected horizontal deflection signal on the signal line 78 is supplied to the integrating circuit 128 and the inverting circuit 130.
Is supplied to. The inversion circuit 130 inverts the uncorrected horizontal deflection signal, puts it on the signal line 132, and supplies it to the integration circuit 128. The first variable resistor 134 and the second variable resistor 13
6 is arranged between the signal lines 78 and 132, and corrects parallelogram distortion and unequal-sided quadrilateral distortion, respectively, and FIG.
It corresponds to the vertical parallelogram distortion compensation setting device 36 and the vertical unequal quadrilateral distortion compensation setting device 44 shown in FIG.

To explain further, the first variable resistor 134
Thus, the user can compensate the vertical parallelogram distortion by simply turning the vertical parallelogram distortion compensation setting device 36 (see FIG. 5). Vertical parallelogram distortion compensation setting device 3
By such adjustment of 6, a part of the uncorrected horizontal deflection signal or the inverted uncorrected horizontal deflection signal is added to the changed vertical deflection signal generated by the second summing circuit 138. The second adder circuit 138 will be described later. Similarly, the second variable resistor 136 allows the user to compensate for the inequilateral quadrilateral distortion in the vertical direction simply by turning the vertical unequal quadrilateral distortion compensation setting device 44 (see FIG. 5). By such adjustment of the vertical unequal quadrilateral distortion compensation setting device 44, a part of the uncorrected horizontal deflection signal or the inverted uncorrected horizontal deflection signal is generated by the first summing circuit 140 as the first corrected horizontal deflection signal. Is added to. The first summing circuit 140 will be described later.

The integrating circuit 128 integrates both the uncorrected horizontal deflection signal and the inverted uncorrected horizontal deflection signal, and outputs the signal line 14
2 produces a positive integrated horizontal deflection signal, and a signal line 144 produces a negative integrated horizontal deflection signal. Third variable resistor 14
The sixth and fourth variable resistors 148 are connected to the signal lines 142 and 14
4 are provided to compensate the pincushion centering distortion and the pincushion distortion, respectively, and correspond to the vertical pincushion centering distortion compensation setting device 48 and the vertical pincushion distortion compensation setting device 40 shown in FIG. 5, respectively.

To explain further, the third variable resistor 146
Thus, the user can compensate the vertical pincushion centering distortion by simply turning the vertical pincushion centering distortion compensation setting device 48 (see FIG. 5). By such adjustment of the vertical pincushion centering distortion compensation setting device 48,
Part of the positive or negative integrated horizontal deflection signal is the second addition circuit 13
It is added to the modified vertical deflection signal generated in step 8. Similarly, the fourth variable resistor 148 allows the user to compensate for vertical (up and down) pincushion distortion by simply turning the vertical pincushion distortion compensation setting device 40 (see FIG. 5). By such adjustment of the vertical pincushion distortion compensation setting device 40, a part of the positive or negative integrated horizontal deflection signal is added to the first corrected horizontal deflection signal generated by the first summing circuit 140.

The first summing circuit 140 includes the second variable resistor 1
And a part of the horizontal deflection signal from the fourth variable resistor 14
A part of the integrated horizontal deflection signal from 8 is combined to generate a first corrected horizontal deflection signal, which is placed on the signal line 150 and supplied to the multiplication circuit 152. The multiplication circuit 152 uses the signal line 150.
The composite vertical deflection signal is generated by receiving the above-described first corrected horizontal deflection signal and the vertical deflection signal on the signal line 80, and the composite vertical deflection signal is placed on the signal line 154 and supplied to the second summing circuit 138. The second adding circuit 138 synthesizes a part of the horizontal deflection signal from the first variable resistor 134, a part of the integrated horizontal deflection signal from the third variable resistor 146, and the composite vertical deflection signal on the signal line 154. To generate the modified vertical deflection signal,
The signal is placed on the signal line 156 and supplied to the standard vertical deflection circuit 158.

The fifth variable resistor 160 is disposed between the voltage source (V) and the standard vertical deflection circuit 158 and appropriately corrects the vertical size (size) of the image and compensates the vertical total image size. It corresponds to the setting device 24 (see FIG. 5). The fifth variable resistor 160 allows the user to change the vertical size (size) of the entire image simply by turning the vertical total image size compensation setting device 24 (see FIG. 5).
Similarly, the sixth variable resistor 162 is disposed between the voltage source (V) and the standard vertical deflection circuit 158, and appropriately corrects the centering (center position) of the image in the vertical direction and also sets the vertical image centering compensation setting device. 20 (see FIG. 5)
It corresponds to. The sixth variable resistor 162 allows the user to simply rotate the vertical full-image centering compensation setting device 20 to vertically center the entire image (center position).
Can be changed. Finally, the standard vertical deflection circuit 158 includes a vertical deflection signal on the signal line 80, a dynamic image size signal on the signal line 72, a modified vertical deflection signal on the signal line 156, and the fifth and sixth variable resistors. The signals are combined, the corrected vertical deflection signal is placed on the signal line 88, and the CRT 8
No. 6 yoke 84 (see FIG. 1).

[0037]

The projection image compensating apparatus of the present invention can generate a projection image on a screen of a cathode ray tube (CRT) in which geometrical distortion and chromatic aberration that occur in the projection image when passing through an optical system are compensated in advance. it can. Similarly, geometrical distortion and chromatic aberration occurring in the projected image when the projected image is projected at a distance from the lens of the optical system can be similarly considered in advance and compensated. The projection image compensation device of the present invention is
It can be used by adding it to the image (video) generation circuit in the display system that has been conventionally used, and can be implemented without adding a new load to the image generation processing of the image generation circuit. Therefore, it can be implemented at low cost, and at the same time, compared with the case where the geometric distortion and chromatic aberration of the projected image are compensated by using software, the load of the image generation processing of the image generation circuit is reduced, and thus high-speed image generation is possible. It is possible.

[Brief description of drawings]

FIG. 1 is a block diagram of a circuit of a field sequential color display system including a projection image compensator according to the present invention.

FIG. 2 is a detailed block diagram of a horizontal deflection correction circuit according to the present invention.

FIG. 3 is a detailed block diagram of a vertical deflection correction circuit according to the present invention.

FIG. 4 is a view showing a state in which a color head-up display system is put on a user's head.

FIG. 5 is a detailed view of an image compensation setting device according to the present invention.

[Explanation of symbols]

 2 Color head-up display system 4 User's head 6 Video box 8 Video synthesizer 10 Video synthesizer 12 Acoustic box 14 Cable 18 Horizontal centering compensation setting device 20 Vertical centering compensation setting device 22 Horizontal image size compensation setting device 24 Vertical Image size compensation setting device 26 Horizontal blue compensation setting device 28 Vertical blue compensation setting device 30 Horizontal red compensation setting device 32 Vertical red compensation setting device 34 Horizontal parallelogram distortion compensation setting device 36 Vertical parallelogram distortion compensation setting device 38 Horizontal pincushion Mold distortion compensation setting device 40 Vertical pincushion distortion compensation setting device 42 Horizontal unequal-sided quadrilateral distortion compensation setting device 44 Vertical unequal-sided quadrilateral distortion compensation setting device 46 Horizontal pincushion centering distortion compensation setting device 48 Vertical pincushion centering distortion compensation setting device Device 50 Signal line Field sequential system video signal) 52 synchronization circuit 54 seventh variable resistor 58 eighth variable resistor 60 multiplexer 62 signal line (horizontal synchronization signal) 64 horizontal raster generation circuit 66 signal line (vertical synchronization signal) 68 vertical raster generation circuit 70 Signal line (image size selection signal) 72 Signal line (dynamic image size signal) 74 Horizontal deflection correction circuit 76 Vertical deflection correction circuit 78 Signal line (Uncorrected horizontal deflection signal) 80 Signal line (Uncorrected vertical deflection signal) 82 Signal line (Corrected horizontal deflection signal) 84 Yoke 86 Cathode ray tube (CRT) 88 Signal line (corrected vertical deflection signal) 90 Screen 92 Achromatic lens 94 User's eye 96 Square circuit 98 Inversion circuit 100 Signal line (Inversion uncorrected) Vertical deflection signal) 102 first variable resistor 104 second variable resistor 106 horizontal image centering Circuit 108 Horizontal image size circuit 110 Signal line (positive parabolic vertical deflection signal) 112 Signal line (negative parabolic vertical deflection signal) 114 Third variable resistor 116 Fourth variable resistor 118 Fifth variable resistor 120 Signal Line (image size signal) 122 Summing circuit 124 Sixth variable resistor 126 Signal line (image centering signal) 128 Integration circuit 130 Inversion circuit 132 Signal line (uncorrected horizontal deflection signal inversion) 134 First variable resistor 136 Second variable Resistor 138 Second summing circuit 140 First summing circuit 142 Signal line (positive integral horizontal deflection signal) 144 Signal line (negative integral horizontal deflection signal) 146 Third variable resistor 148 Fourth variable resistor 150 Signal line ( First corrected horizontal deflection signal) 152 Multiplier circuit 154 Signal line (composite vertical deflection signal) 156 Signal line (changed) Vertical deflection signal) 158 standard vertical deflection circuit 160 fifth variable resistor 162 sixth variable resistor V voltage source (reference voltage source)

Claims (7)

[Claims] 1. A field sequential color display system generates horizontal deflection signals, vertical deflection signals and dynamic image size signals for each of the associated three color image fields and projects them as one image frame on the screen of the cathode ray tube. A projected image compensating device for compensating for geometric distortion and chromatic aberration of the projected image generated when viewing the projected image through an optical system, the horizontal geometric distortion correcting the geometric distortion in the horizontal direction. A horizontal circuit having a correction circuit, an image size circuit for selecting the horizontal image size of each of the related three-color image fields, and an image centering circuit for correcting the position of each of the related three-color image fields. A deflection correction circuit, an integration circuit that integrates the horizontal deflection signal to generate an integrated horizontal deflection signal, and A vertical geometric distortion correction circuit for generating a first corrected horizontal deflection signal for correcting geometric distortion, and a multiplication circuit for generating a composite vertical deflection signal from the first corrected horizontal deflection signal and the vertical deflection signal. A horizontal deflection correction circuit having: and a projection image compensation device comprising: 2. A square circuit for the horizontal geometric distortion correction circuit to square the vertical deflection signal to generate a parabolic vertical deflection signal, and a part of the vertical deflection signal into the horizontal deflection signal. The first to add and correct the horizontal parallelogram distortion of the projected image
A variable resistor, a second variable resistor for adding a part of the vertical deflection signal to the horizontal deflection signal to correct the inequality quadrilateral distortion in the horizontal direction of the projected image, and one of the parabolic vertical deflection signals. A third variable resistor for adding a horizontal section to the horizontal deflection signal to correct horizontal pincushion centering distortion of the projected image; and adding a portion of the parabolic vertical deflection signal to the horizontal deflection signal to produce the projected image. The projection image compensator according to claim 1, further comprising a fourth variable resistor that corrects the pincushion distortion in the horizontal direction. 3. A fifth variable resistor, wherein the image size circuit adds a part of an image size reference signal to the horizontal deflection signal, the horizontal deflection signal, and the vertical deflection from the second variable resistor. A portion of the signal, a portion of the parabolic vertical deflection signal from the fourth variable resistor, the dynamic image size signal, and a portion of the image size reference signal from the fifth variable resistor. The projection image compensating apparatus according to claim 2, further comprising summing means for generating an image size signal. 4. The sixth variable resistor, wherein the image centering circuit adds a part of a horizontal image centering reference signal to the horizontal deflection signal, the horizontal deflection signal, and the vertical variable from the first variable resistor. An image centering signal is generated from a portion of the deflection signal, a portion of the parabolic vertical deflection signal from the third variable resistor, and a portion of the image centering reference signal from the sixth variable resistor. The projection image compensating apparatus according to claim 3, further comprising summing means. 5. The projection image compensating apparatus according to claim 4, further comprising a summing circuit that sums the image size signal and the image centering signal. 6. The vertical geometric distortion correction circuit adds a part of the horizontal deflection signal to the vertical deflection signal to correct a parallelogram distortion in the vertical direction of the projected image.
A variable resistor, a second variable resistor for adding a portion of the horizontal deflection signal to the vertical deflection signal to correct the unequal quadrilateral distortion of the projected image in the vertical direction, and a portion of the integrated horizontal deflection signal. Is added to the vertical deflection signal to correct the pincushion centering distortion in the vertical direction of the projected image, and a part of the integrated horizontal deflection signal is added to the vertical deflection signal to determine the vertical direction of the projected image. Fourth to correct pincushion type distortion in direction
The projection image compensating device according to claim 1, 2, 3, 4, or 5, comprising: a variable resistor. 7. The first corrected horizontal deflection signal is derived from a part of the horizontal deflection signal from the second variable resistor and a part of the parabolic horizontal deflection signal from the fourth variable resistor. First summing means for generating, a part of the horizontal deflection signal from the first variable resistor,
Second summing means for generating a modified vertical deflection signal from a part of the integrated horizontal deflection signal from the third variable resistor and the composite vertical deflection signal, the vertical deflection signal, and the dynamic image size signal. 7. The projection image compensator according to claim 6, further comprising: a standard vertical deflection circuit that generates a corrected vertical deflection signal from the changed vertical deflection signal.