JP3414939B2 - Image display device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device for displaying an image input by a TV camera or an image generated by a computer, and more particularly to a projection type (projection type) color image display device. .

[0002]

2. Description of the Related Art In these image display devices, higher-definition and higher-quality image reproduction is desired, and therefore, more accurate correction of optical distortion is also desired.

A conventional projection display device using a CRT will be described with reference to FIGS. 6 and 7. FIG. 6 and FIG. 7 are diagrams showing a shading correction circuit and its outline of a conventional projection display device disclosed in, for example, Japanese Patent Laid-Open No. 60-18084.

In FIG. 6, 1, 2, and 3 are terminals to which an input image signal, a clamp pulse, and a horizontal synchronizing signal are respectively input, 4 is a clamp circuit, 5 is a sawtooth waveform generation circuit,
Reference numeral 6 is a bias circuit, 7 is a multiplication circuit, and 8 is a terminal for outputting a corrected image signal.

In FIG. 7, 9 is a CRT for R and 10 is a GRT.
CRT, 11 is a CRT for B, and 12 is a projection screen.

As shown in FIG. 7, the distance from each CRT 9-11 to the projection screen 12 is not constant. For example, looking at the CRT 9 for R, the left end is closest and the right end is farthest. That is, the distance LL from the left end of the CRT 9 to the left end of the projection screen 12 and the CRT 9
Comparing with the distance LR from the right end of the projection screen 12 to the right end of the projection screen 12, it is clear that LL <LR. For this reason,
To make the illuminance on the projection screen 12 uniform, R
The intensity of the beam output from the CRT 9 for use at the right end needs to be strongest at the right end.

Therefore, as shown in FIG. 6, the input image signal input to the terminal 1 is generated by the sawtooth waveform generating circuit 5 based on the horizontal synchronizing signal input to the terminal 3, and the waveform (level) is generated on the right side. ) Is increased, the corrected image signal obtained by multiplying the sawtooth waveform signal by the multiplying circuit 7 through the bias circuit 6 is applied to the CRT 9 through the terminal 8. As a result, it is possible to obtain a uniform image on the projection screen 12 without the influence of shading.

The same applies to the B CRT 11 although the left and right are reversed. The shading correction circuit shown in FIG. 6 is provided for each CRT.

On the other hand, the projection type display device is an example of correction in the case of a device using CRTs 9 to 11 of three colors of RGB. In recent years, a display device using an LCD panel has been developed as a projection type display device. Among them, a two-panel type or four-panel type display device capable of obtaining a bright image with higher brightness is drawing attention.

When displaying color signals, this not only uses a color LCD panel, but also a monochrome panel and a color panel, or a monochrome panel and R, G, B panels, and combines the light from each panel. By doing so, a bright image is obtained.

Next, a conventional projection type display device using an LCD panel will be described with reference to FIG. FIG. 8 is a diagram showing a schematic configuration of a conventional projection display device using an LCD panel.

FIG. 8 shows the internal structure of the projection unit 13 in such a display device. In the figure, 14 is a light source, 15 is an elliptical mirror for collecting the light from the light source 14 in one direction, 16 is a condenser lens for collecting the light from the elliptical mirror 15, and 17 is for separating P deflection and S deflection. Is a polarizing beam splitter.

In the figure, 18 is a reflecting mirror for reflecting P-polarized light, 19 is a reflecting mirror for reflecting S-polarized light,
Reference numeral 20 is a color LCD panel, 21 is a monochrome LCD panel, 22 is a combining prism for optically combining the lights from the respective panels 20, 21, and 23 is a projection lens for projecting the combined light on a screen. . Reference numeral 12 is a projection screen.

Now, it is assumed that the correction method of the above-mentioned correction circuit is generalized, and the correction of the inverse characteristic of the distortion generated when the light of each color is projected is added to the signal. That is, monochrome LC
Assuming that the W signal input to the D panel 21 is optically distorted Hw (x, y) when projected, the corrected image signal W ′ obtained by multiplying the input image signal by the following equation 1
The voltage is applied to the CD panel 21. Where x, y
Is a projection screen 12 on which the image signal is projected.
The upper position (coordinates) is shown. Also, k is a predetermined constant.

K / Hw (x, y) Equation 1

On the other hand, for the color signals R, G, B,
Similarly, a signal obtained by multiplying each of Equations 2, 3, and 4 will be used.

K / Hr (x, y) Equation 2 k / Hg (x, y) ... Formula 3 k / Hb (x, y) Equation 4

By performing these corrections, it is possible to obtain an image in which the shading generated in the optical system is suppressed.

However, in such a conventional correction method, the W signal applied to the monochrome LCD panel 21 is corrected in a single manner, and when the distortion has frequency dependence, the average value of the distortion amount ( (Average on the frequency axis)
Since the correction is performed by using, there is a problem that the hue of the display image is deviated.

Next, another conventional projection display device using an LCD panel will be described with reference to FIGS. 9 and 10. FIG. 9 is a diagram showing a schematic configuration of another conventional projection display device using an LCD panel. Also, FIG.
FIG. 0 is a diagram showing the reflection characteristics of the reflecting mirror (material is aluminum) of another conventional projection display device using an LCD panel.

In FIG. 10, the horizontal axis indicates the incident angle (degree), the vertical axis indicates the reflectance, the black triangle plot indicates R, the black square plot indicates G, and the black circle plot indicates B.

In the display device using the LCD panel shown in FIG. 9, a reflecting mirror is used to shorten the optical path of the projection optical system for the purpose of further miniaturization. In the figure,
Reference numeral 12 is a projection screen, 13 is a projection unit, and 24 is a reflecting mirror (material is aluminum). The projection unit shown in FIG. 8 is used as the projection unit 13. Here, the incident angle means the angle between the normal line (dotted line) of the reflecting mirror 24 and the incident light ray from the projection lens 23 of the projection unit 13 in FIG.

As is apparent from FIG. 10, the incident angle is 80
If it is used up to a degree range, the loss of blue (B) is large near 80 degrees, and the W signal applied to the monochrome LCD panel 21 becomes a reddish color.

[0024]

The LCD as described above.
In a conventional projection display device using a panel, a monochrome L
The W signal applied to the CD panel 21 is a single correction, and when the distortion has frequency dependence, the average value of the distortion amount (average on the frequency axis) is used for correction, and the display image There was a problem that the color tone of was shifted.

Further, in another conventional projection display device using an LCD panel, if it is used up to an area where the incident angle with respect to the reflecting mirror 24 is about 80 degrees, blue loss is large near 80 degrees, and a monochrome LCD. W applied to panel 21
There was a problem that the signal became a reddish color.

The present invention has been made in order to solve the above-mentioned problems, and an object thereof is to obtain an image display device capable of obtaining a display image having a good color tone over the entire screen.

[0027]

An image display device according to the present invention comprises a projection unit for converting an image signal into an optical signal ,
Reflects the optical signal from the projection unit at a predetermined angle
Projects a reflection mirror and the optical signal reflected by the reflection mirror.
And a projection screen for
Is a monochrome LCD for displaying monochrome image signals
Panel and color LC for displaying color image signals
D panel, the monochrome LCD panel and the color
The combined light from the LCD panel is projected onto the projection screen.
Projection lens for projecting to and the input monochrome image
Applying an image signal to the monochrome LCD panel
The input monochrome image signal and the reflection mirror.
Multiply with the correction coefficient obtained from the reflection characteristics at the relevant position
Then, this multiplication signal and the input color image signal are added
Was summation signal is one having a correction circuit to be applied to the color LCD panel.

Further, the image display apparatus according to the present invention, prior to
The correction coefficient is different for each of R, G, and B.

Also, in the image display device according to the present invention, the correction circuit projects the projection color on the input color image signal.
Corrects distortion caused by lens system and distortion caused by the reflector
Color-corrected image signal obtained by multiplying the multiplication coefficient for
And the multiplication signal, the added signal is added to the color L
It is applied to the CD panel .

Further, the image display apparatus according to the present invention, prior to
The multiplication coefficient is different for each of R, G, and B.

The image display device according to the present invention isPrevious
The correction coefficient is the position (x, y) on the projection screen.
The attenuation factor of the reflecting mirror with respect to the signal of
r (x, y), Hg (x, y), Hb (x, y),
If the constant for gain adjustment of the circuit system is k2, R, G, B
Every, k2 * (1 / Hr (x, y) -1), k2 * (1 / Hg (x, y) -1), k2 * (1 / Hb (x, y) -1) Represented by It is a thing.

The image display device according to the present invention isPrevious
The multiplication coefficient is the position (x, y) on the projection screen.
The attenuation factor of the reflecting mirror with respect to the signal of
r (x, y), Hg (x, y), Hb (x, y),
Let k1 be the constant for gain adjustment of the circuit system, and use it for the projection lens system.
The angle of deviation of the pixel signal from the optical center is θ
Then, for each R, G, B, k1 / cos ^Four θ / Hr (x, y), k1 / cos ^Four θ / Hg (x, y), k1 / cos ^Four θ / Hb (x, y) Represented by It is a thing.

[0033]

[0034]

DETAILED DESCRIPTION OF THE INVENTION

Embodiment 1. The configuration of the first embodiment of the present invention will be described with reference to FIGS. 1, 2, 3, and 4. FIG. 1 is a diagram showing a schematic side view of a projection type image display device using an LCD panel according to Embodiment 1 of the present invention. FIG. 2 is a block diagram showing the correction circuit according to the first embodiment of the present invention. Further, FIG. 3 is a circuit diagram showing a configuration of each addition / clamp / drive circuit in FIG. Figure 4
It is a figure which shows the correction coefficient stored in each ROM (45-47) of FIG. In each figure, the same reference numerals indicate the same or corresponding parts.

In FIG. 1, 12 is a projection screen and 1
3A is a projection unit and 24 is a reflecting mirror. The internal structure of the projection unit 13A is the same as that of the projection unit 13 described above.

In FIG. 2, reference numeral 30 is a terminal for receiving the W input image signal, 31 is a terminal for receiving the clamp signal,
Reference numeral 32 is a terminal for receiving a horizontal synchronizing signal, 33 is a terminal for receiving a pixel clock, 34 is a terminal for receiving an R input image signal, 35 is a terminal for receiving a G input image signal, 3
Reference numeral 6 is a terminal into which the B input image signal is input.

In the figure, 37 is a line counter for counting horizontal synchronizing signals, 38 is a pixel counter for counting pixel clocks, and 39 to 41 are storage coefficients for multiplying input image signals according to pixel positions. ROM, 42
~ 44 are multipliers, 45 ~ 47 are RG according to the line position
ROM storing B correction coefficients, 48 to 50 D / A converters using RGB correction coefficients as analog signals, and 51 W
Analog multiplication of input image signal with RGB correction coefficient 3
This is a ch analog multiplication circuit.

Further, in the figure, 52 is a clamp / drive circuit for the W signal, and 53 to 55 are the RGB multiplication image signals corrected by the conventional method and the analog multiplication circuit 5 described above.
It is an addition / clamp / drive circuit that adds the output of 1.
The analog multiplication circuit 51 is, for example, M52328S.
It is realized by a P 3ch gain control IC. Also, 56 is W
An output image signal output terminal, 57 is an R output image signal output terminal, 58 is a G output image signal output terminal,
Reference numeral 59 is a terminal through which the B output image signal is output.

The W output image signal output from the terminal 56 is applied to the monochrome LCD panel 21 in the projection unit 13A, and RGB output from the terminals 57 to 59.
The output image signals of the respective colors are applied to the color LCD panel 22.

Although FIG. 3 shows the internal structure of the adder / clamp / drive circuit 53 for R, the adder / clamp / drive circuit 54 for G and the adder / clamp / drive circuit 55 for B are also the same. Is.

FIG. 4 shows the data (correction coefficient) stored in the ROMs 45 to 47.
10 is obtained by calculation from the characteristics of FIG. Further, in FIG. 4, the horizontal axis indicates the vertical direction on the projection screen, the left side indicates the lower side, and the right side indicates the upper side.
(A), (b) and (c) show an R correction coefficient, a G correction coefficient and a B correction coefficient, respectively.

Next, the operation of the first embodiment will be described. When the input image signal is input, the line counter 37 counts the vertical position based on the horizontal synchronizing signal. As shown in the respective characteristics of FIG. 4, the ROMs 45 to 47 store values with large attenuation in the lower part of the screen position and small attenuation in the upper part. For this reason,
The D / A converters 48 to 50 output the correction coefficients for each color that are analogized, and the analog multiplication circuit 51 outputs the signals obtained by multiplying these by the W input image signal.

On the other hand, the ROMs 39 to 41 store coefficients for correcting the distortion caused by the projection lens system and the distortion caused by the reflecting mirror 24. Specifically, the attenuation factors of the reflecting mirror 24 at the position (x, y) on the projection screen 12 are Hr (x, y), Hg (x, y), Hb (x, y).
, The coefficients represented by the following equations 5, 6, and 7 are stored. Here, k1 is a constant for adjusting the gain of the circuit system.

K1 / cos ⁴ θ / Hr (x, y) Equation 5 k1 / cos ⁴ θ / Hg (x, y) Equation 6 k1 / cos ⁴ θ / Hb (x, y) .... Formula 7

Next, for example, in the adder / clamp / drive circuit 53 for R, as shown in FIG.
At the emitter (E) of
The corrected image signal and the R addition signal input from the terminal 60 are configured to be added in an analog manner. In addition, R
The corrected image signal is input via the capacitor 65 and is clamped at the timing of the clamp signal input from the terminal 63. This R-corrected image signal is shown in FIG.
The R input image signal input from the terminal 34 of
This signal is obtained by multiplying the coefficient of OM39, and G, B of other colors
The processing is similar.

Further, as shown in FIG.
The added output from the emitter (E) of 3 is output to the collector (C) of the transistor 73, but the drive capability is increased by the transistor 77 that constitutes an emitter follower. Other adder / clamp / drive circuits 54, 55
Also has the same configuration.

Further, a clamp / drive circuit 52 for W
Is the path of the addition signal from the circuit of FIG.
The circuit configuration is the same except that the operation is the same except that the addition signals are not added.

Thus, in the upper part of the screen (screen),
The analog input circuit 51 multiplies the W input image signal by a relatively large coefficient, and multiplies a relatively small coefficient in the lower part of the screen (screen). And addition, clamp,
Each of the RGB correction image signals is added to the output signal (multiplication signal) of the analog multiplication circuit 51 in the drive circuits 53, 54 and 55, which is based on the reflection of the reflection mirror 24 shown in FIG. 10 with respect to the W input image signal. The distortion having frequency dependency is corrected.

Embodiment 2. In the second embodiment, all input image signals are digital signals, and correction processing is also performed by digital calculation.

The second embodiment of the present invention will be described with reference to FIG. FIG. 5 shows the second embodiment of the present invention.
It is a figure which shows the correction circuit of. Other configurations are the same as those in the first embodiment.

In FIG. 5, reference numeral 30 is a terminal for receiving the W input image signal, 31 is a terminal for receiving the clamp signal,
Reference numeral 32 is a terminal for receiving a horizontal synchronizing signal, 33 is a terminal for receiving a pixel clock, 34 is a terminal for receiving an R input image signal, 35 is a terminal for receiving a G input image signal, 3
Reference numeral 6 is a terminal into which the B input image signal is input.

In the figure, 37 is a line counter for counting horizontal synchronizing signals, 38 is a pixel counter for counting pixel clocks, and 39 to 41 are RGs according to pixel positions.
RO for storing multiplication coefficient for multiplying B input image signal
M, 42 to 44 are digital multipliers, and 45 to 47 are ROMs storing RGB correction coefficients according to line positions.

Further, in the figure, 52A is a drive circuit for W signals, and 53A to 55A are drive circuits for RGB signals. Further, 56 is a terminal through which the W output image signal is output, 5
Reference numeral 7 is a terminal for outputting an R output image signal, 58 is a terminal for outputting a G output image signal, and 59 is a terminal for outputting a B output image signal.

Further, in the figure, 90 is a ROM in which coefficients described later are stored, 91 is a digital multiplier, and 92 is
Similarly, 94 to 94 are digital multipliers for multiplying W input image signals, 95 to 97 are digital adders, and 98 is RG.
A 3-channel D / A converter for B signals and a D / A converter 99 for W signals.

In the second embodiment, two-dimensional correction is performed as correction for optical distortion. For this reason,
The pixel counter 38 counts the pixel clock, and outputs the all coefficient storage ROMs 39 to 41, 45 to 4
7 and 90 are input.

The ROM 90 stores coefficients for correcting distortion caused by the projection lens system. Specifically, the angle of deviation from the optical axis center at the pixel position is set to θ, and the value stored in Equation 8 below is stored as the coefficient. In other words, this angle θ is equal to the reflection mirror 24 in FIG.
Is removed and the projection unit 13A is placed at a horizontal position with respect to the projection screen 12, the projection screen 1
2 and a straight line connecting the center of the projection lens 23 in the projection unit 13A and the projection lens 23.
And the optical axis passing through the center of the projection screen 12 are defined by the angle.

K0 / cos ⁴ θ Equation 8

In ROMs 45 to 47, the following equations 9 and 1 are stored.
0, the value of the coefficient represented by Expression 11 is stored. here,
k0 and k2 are constants for adjusting the gain of the circuit system.

[0059] k2 * (1 / Hr (x, y) -1) ... Equation 9 k2 * (1 / Hg (x, y) -1) ... Equation 10 k2 * (1 / Hb (x, y) -1) ... Equation 11

As a result, if the signal corrected by the correction circuit is applied to the LCD panels 20 and 21,
When the constants are ignored, the R component in the W signal and the R signal passes through the projection lens system and the reflecting mirror 24 and is represented by the following Expression 12.

Wr (x, y) / cos ⁴ θ * cos ⁴ θ * Hr (x, y) + R (x, y) / cos ⁴ θ / Hr (x, y) * cos ⁴ θ * Hr (x, y) + Wr (x, y) / cos ⁴ θ * (1 / Hr (x, y) −1) * cos ⁴ θ * Hr (x, y) = Wr (x, y) + R (x, y) .... Formula 12

Here, Wr in the right side of the above equation 12
(X, y) and R (x, y) are signal levels of the R component to be displayed on the monochrome LCD panel 21 and the color LCD panel 20 when there is no distortion in the optical system.

Similarly, the G component and the B component are also expressed by the following equation 1
3 and Equation 14.

[0064] Wg (x, y) + G (x, y) ... Formula 13 Wb (x, y) + B (x, y) Equation 14

As a result, an extremely uniform image without optical distortion can be obtained.

Third Embodiment In each of the above embodiments, the correction data storage memory is a ROM for writing fixed data.
However, the RAM may be used and rewritten at an appropriate timing such as when the power is turned on.

Fourth Embodiment In each of the above embodiments, the distortion of the optical system is caused by the projection lens system,
Although the one caused by the reflecting mirror is mentioned, it may be corrected including the distortion of the light source system such as non-uniformity of illumination on the LCD.

Embodiment 5. In each of the above-mentioned embodiments, the distortion of the optical system is caused by the projection lens system,
Although the one caused by the reflecting mirror is mentioned, the same correction as described above may be applied to the distortion of the light emitting device itself such as the pixel defect of the LCD.

[0069]

As described above, the image display apparatus according to the present invention is a projection unit for converting an image signal into an optical signal.
And the optical signal from the projection unit at a specified angle.
The reflecting mirror and the optical signal reflected by the reflecting mirror.
A projection screen for projecting,
Is a monochrome L for displaying a monochrome image signal.
CD panel and color for displaying color image signals
LCD panel, the monochrome LCD panel and the LCD panel
The combined light from the LCD panel
The projection lens for projecting the
(B) When an image signal is applied to the monochrome LCD panel,
The input monochrome image signal and the reflecting mirror
Multiply by the correction coefficient obtained from the reflection characteristics at the relevant position in
Then, this multiplication signal and the input color image signal are added.
Because it has a correction circuit which applies a sum signal calculated on the color LCD panel, an effect that it is possible to obtain good quality images with reduced deviation in tint.

Further, in the image display device according to the present invention, as described above, the correction coefficient is different for each of R, G and B.
Since such a value is set, it is possible to obtain an image of good quality in which deviation of the hue is suppressed.

Further, in the image display device according to the present invention, as described above, the correction circuit receives the input signal.
Distortion due to the projection lens system and the reflection
Obtained by multiplying by the multiplication coefficient to correct the distortion caused by the mirror
Addition in which the color-corrected image signal and the multiplication signal are added
Since the signal is applied to the color LCD panel, it is possible to obtain an image of good quality in which deviation of the hue is suppressed.

Further, in the image display device according to the present invention, as described above, the multiplication coefficient is different for each of R, G and B.
Since such a value is set, it is possible to obtain an image of good quality in which deviation of the hue is suppressed.

The image display device according to the present invention is as follows.
As explained above,If the correction coefficient is the projection screen
Attenuation of the reflector for a signal at position (x, y) on
Hr (x, y), Hg (x, y),
Let Hb (x, y) be the constant for gain adjustment of the circuit system k2
Then, for each R, G, B, k2 * (1 / Hr (x, y) -1), k2 * (1 / Hg (x, y) -1), k2 * (1 / Hb (x, y) -1) Represented by So good quality with less color shift
The effect of being able to obtain the image of is obtained.

The image display device according to the present invention is as follows.
As explained above,If the multiplication coefficient is the projection screen
Attenuation of the reflector for a signal at position (x, y) on
Hr (x, y), Hg (x, y),
Let Hb (x, y) be the constant for gain adjustment of the circuit system k1.
And the optical center of the pixel signal in the projection lens system.
If the angle of deviation is θ, then R, G, and B k1 / cos ^Four θ / Hr (x, y), k1 / cos ^Four θ / Hg (x, y), k1 / cos ^Four θ / Hb (x, y) Represented by So good quality with less color shift
The effect of being able to obtain the image of is obtained.

[0075]

[Brief description of drawings]

FIG. 1 is a diagram showing an outline of an entire apparatus according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a correction circuit according to the first embodiment of the present invention.

FIG. 3 is a diagram showing the addition / correction of the correction circuit according to the first embodiment
It is a block diagram showing a clamp and drive circuit.

FIG. 4 is a diagram showing a characteristic of a correction coefficient according to the first embodiment of the present invention.

FIG. 5 is a block diagram showing a correction circuit according to a second embodiment of the present invention.

FIG. 6 is a diagram showing a shading correction circuit of a conventional projection display device using a CRT.

FIG. 7 is a diagram showing an outline of a conventional projection display device using a CRT.

FIG. 8 is a diagram showing a schematic configuration of a conventional projection display device using an LCD panel.

FIG. 9 is a diagram showing a schematic configuration of another conventional projection display device using an LCD panel.

FIG. 10 is a diagram showing reflection characteristics of a reflecting mirror (a material is aluminum) of another conventional projection display device using an LCD panel.

[Explanation of symbols]

12 projection screen, 13A projection unit, 24
Reflector, 37 line counter, 38 pixel counter,
39, 40, 41 ROM, 42, 43, 44 multiplier,
45, 46, 47 ROM, 48, 49, 50 D / A
Converter, 513ch analog multiplication circuit, 52 W signal clamp / drive circuit, 53, 54, 55 addition / clamp / drive circuit.

─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-4-44490 (JP, A) JP-A-5-196913 (JP, A) JP-A-5-197357 (JP, A) JP-A-6- 18839 (JP, A) JP 7-154808 (JP, A) JP 8-251614 (JP, A) JP 9-146496 (JP, A) Jitsukai 3-98582 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H04N 9/31

Claims (6)

(57) [Claims] 1. Converting an image signal into an optical signalProjection unit
And Reflects the optical signal from the projection unit at a predetermined angle
With a reflector A projector for projecting the optical signal reflected by the reflecting mirror.
With a picture screen, The projection unit is Monochrome LCD panel for displaying monochrome image signals
And Color LCD panel for displaying color image signals
When, The monochrome LCD panel and the color LCD panel
The combined light from is projected on the projection screen.
A projection lens for The input monochrome image signal is transferred to the monochrome LCD panel.
And the input monochrome image signal.
No. and the reflection characteristics at that position on the reflector
Multiplying the correction coefficient with the
-The added signal obtained by adding the image signal is added to the color LCD screen.
Flannel Correction circuit applied toWhenToHaveCharacterized by
Image display device. 2. The correction coefficient is different for each of R, G, and B.
The image display device according to claim 1, which is a value . 3. The input color is corrected by the correction circuit.
Distortion caused by the projection lens system in the image signal and the reflection mirror
Color obtained by multiplying the multiplication coefficient to correct the distortion caused by
-Addition signal obtained by adding the corrected image signal and the multiplication signal
The image display device according to claim 1 or 2 , wherein a voltage is applied to the color LCD panel . 4. The multiplication coefficient is different for each of R, G, and B.
The image display device according to claim 3, which is a value . 5.The correction factor is on the projection screen.
The attenuation factor of the reflector for the signal at the position (x, y) of
Hr (x, y), Hg (x, y), Hb for each R, G, B
Let (x, y) be k2 be the constant for gain adjustment of the circuit system.
Then, for each R, G, B, k2 * (1 / Hr (x, y) -1), k2 * (1 / Hg (x, y) -1), k2 * (1 / Hb (x, y) -1) Represented by Characterized byClaim 1 or 2Described
Image display device. 6.The multiplication factor is on the projection screen
The attenuation factor of the reflector for the signal at the position (x, y) of
Hr (x, y), Hg (x, y), Hb for each R, G, B
(X, y), and the constant for gain adjustment of the circuit system is k1.
From the optical center of the pixel signal in the projection lens system
If the angle of deviation is θ, then for each R, G, B k1 / cos ^Four θ / Hr (x, y), k1 / cos ^Four θ / Hg (x, y), k1 / cos ^Four θ / Hb (x, y) Represented by Characterized byClaim 3 or 4Described
Image display device.