JP2000338916A - Image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure further improvement in resolution by correcting a time lag in response speed of a display element while substantially increasing the number of pixels thereof by a pixel shift. SOLUTION: In this image display device including an LCD consisting of pixels arranged in a matrix, the pixel shift optical element capable of changing a display position by the same pixel in a plurality of fields in one frame by periodically shifting an optical axis from the LCD, and a driving circuit for driving the LCD while feeding an image signal thereto by synchronization with the optical axis shift, there is provided an image correction computation portion 114 for determining the difference ΔX between a preceding field image signal xn-1 and a present field image signal xn in each pixel, computing a correction value corresponding to the difference ΔX with a lookup table 52 and computing circuits 53, 54, 55 of each kind, thereby correcting the present field image signal xn, and outputting the corrected image signal xn' to the corresponding pixel.

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, and more particularly to an image display device capable of displaying a number of pixels several times the number of pixels included in an image display device.

[0002]

2. Description of the Related Art In recent years, in a two-dimensional image display device using an image display element such as a liquid crystal, a plasma, and an EL, a method of substantially increasing the number of pixels of the image display element by shifting pixels has been proposed. For example, in Japanese Patent Application Laid-Open No. Hei 7-36054, the number of pixels four times the actual number of pixels is obtained by shifting the pixels of a liquid crystal display element (LCD) to four locations in one frame (shifting four pixels). I have.

[0003]

However, this type of apparatus has the following problems. In other words, in order to shift four pixels, four pixels are shifted within one frame (30 Hz).
Images must be displayed, and therefore 30 × 4 = 1
The image must be rewritten at 20 Hz (about 8.3 ms). However, LCDs generally have a response speed of 20 ms.
It is as slow as several 100 ms, and does not show a sufficient response to a change in the video signal. As a result, although the actual number of pixels is increased by the pixel shift, there is a problem that the resolution does not increase so much.

The present invention has been made in consideration of the above circumstances, and has as its object to substantially increase the number of pixels of an image display element by shifting pixels, and to reduce the response of the image display element. An object of the present invention is to provide an image display device capable of correcting a speed delay and further improving resolution.

[0005]

(Structure) In order to solve the above problem, the present invention employs the following structure.

That is, according to the present invention, a pixel display element having a display section in which a plurality of pixels are regularly arranged, and an optical axis of light emitted from the display section of the image display element based on input of a video signal are periodically set. Optical axis displacing means for varying the display position of the same pixel in a plurality of fields in one frame, and displaying different images on the image display element in synchronization with the displacement of the optical axis by the optical axis displacing means. An image display device comprising: an image display control unit;
Video signal correction means is provided for correcting the video signal so that the accumulated amount of luminance displayed by the image display element during the field period becomes a predetermined amount.

Here, preferred embodiments of the present invention include the following. (1) The video signal correction means corrects the video signal based on the difference between the video signal level of the current field to be displayed by at least one arbitrary pixel of the image display element and the video signal level of the previous field. (2) The image display element is configured so that display luminance can be controlled by an applied voltage level, and the signal correction unit includes:
An applied voltage reference unit that can refer to a voltage level corresponding to the display luminance, and corrects the input video signal based on the voltage level referred to by the applied voltage reference unit so that the accumulated amount of luminance becomes a predetermined amount. .

(3) The applied voltage reference means is a look-up table. (4) Data stored in the lookup table is updated based on predetermined conditions. (5) The lookup table must be updated during the vertical blanking period of the input video signal. If not all data can be sent in one vertical blanking period, split the data and send it. (6) The image display element has a temperature detecting means for detecting the environmental temperature itself or the environment temperature in the vicinity of the element, and the predetermined condition for updating the lookup table is based on a temperature change detected by the temperature detecting means.

(7) The image display device has temperature detecting means for detecting the environmental temperature of the image display element itself or the vicinity thereof, and the video signal correcting means changes the correction amount based on the temperature detected by the temperature detecting means. (8) The video signal correction means changes the characteristic of the correction amount depending on whether the difference between the video signal level of the current field and the video signal level of the previous field is positive or negative. (9) The video signal correction means changes the characteristics of the correction amount based on the format of the input video signal (video signal standard). Specifically, NTSC (field frequency 6
0 Hz) and PAL (field frequency 50 Hz) by changing the amount of correction to reduce the amount of PAL correction compared to NTSC.

(10) The image display element has a display element for detection which performs display in a predetermined pattern, and light detecting means for detecting the display luminance of the display element for detection. Determining the response performance of the image display element from the detection result of the light detection means, and controlling the correction amount based on the determination result. More specifically, the difference between the average value of the detection signal when displayed in a low-frequency pattern and the average value of the detection signal when displayed in a high-frequency pattern is determined, and the correction amount is determined based on the difference. To control. (11) The video signal correction means corrects the current field video signal so that the difference between the previous field video signal and the current field video signal becomes larger.

(Operation) According to the present invention, the video signal correcting means is provided in the pixel shifting method, and the video signal is adjusted so that the accumulated amount of luminance displayed by the image display element during one field period of the video signal becomes a predetermined amount. Correction, for example, comparing the previous field video signal with the current field video signal, and correcting the current field video signal based on the comparison result can prevent a decrease in resolution due to a response delay of the image display device.

More specifically, by correcting the current field video signal so that the difference between the previous field video signal and the current field video signal becomes larger, the average value of the luminance at the pixels by the corrected video signal is obtained. The luminance can be made closer to the ideal luminance, and as a result, the response delay of the image display element can be corrected.

Although the response characteristic of the image display element changes depending on the temperature, the temperature of the image display element itself or the vicinity thereof is detected, and the correction amount of the video signal is changed in accordance with the detected result, whereby the image display element has a response characteristic. Even if the temperature changes, it is possible to always perform the optimum correction.

The frame frequency of the video signal differs between NTSC and PAL, and the response characteristics of the image display element change depending on the frame frequency. By changing the correction amount of the video signal according to the frame frequency, NTSC and PAL are used. Regardless, the optimum correction can be performed.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the illustrated embodiments.

(First Embodiment) FIG. 1 shows a first embodiment of the present invention.
FIG. 3 is a diagram for explaining the basic principle of the image display device according to the embodiment and is a diagram illustrating a configuration of a pixel shifting optical element. In front of a liquid crystal display (LCD) 10 in which a plurality of pixels are arranged in a matrix, a first TN cell 11a, a first birefringent plate 12a, and a second T
An N cell 11b, a second birefringent plate 12b, and a third birefringent plate 12c are arranged.

Light emitted from each pixel of the LCD 10 is polarized in a certain direction (here, a horizontal direction). The TN cell 11a is made of TN liquid crystal, and switches the polarization direction by applying a voltage. When the voltage is turned off, the polarization direction is rotated by 90 °, and when the voltage is turned on, the polarization direction is output as it is. Therefore, the light emitted from the LCD 10 passes through the TN cell 11a, and becomes a horizontally polarized light when the voltage is ON.
When the voltage is OFF, the light is polarized in the vertical direction.

The crystal axis of the birefringent plate 12a is inclined in the thickness direction as shown by the arrow in the drawing, and the optical axis is shifted in the horizontal direction when the polarization direction of the incident light is horizontal. Therefore, the horizontally polarized light (ON) and the vertically polarized light (OFF) incident on the birefringent plate 12a have their optical axes shifted in the horizontal direction by passing through the birefringent plate 12a.

The TN cell 11b switches the polarization direction by applying a voltage similarly to the TN cell 11a. Therefore, by passing through the TN cell 11b, the polarized light (OFF / ON) in the vertical direction at the first position and the first polarized light are turned off.
The polarized light in the horizontal direction (OFF / OFF) at the position
Four types of polarized light are obtained: a vertically polarized light (ON / OFF) at the position (2) and a horizontally polarized light (ON / ON) at the second position.

The birefringent plates 12b and 12c are
As in a, the crystal axis is inclined in the thickness direction, and the optical axis is shifted depending on the polarization direction. However, the birefringent plate 12b shifts horizontally polarized light in the horizontal direction, and the birefringent plate 12c shifts vertical polarized light in the vertical direction. Therefore, the polarized light finally obtained through the birefringent plates 12b and 12c is shifted to four positions as shown in the figure. That is, it is possible to shift four pixels.

Here, the relationship between the voltage application state (ON / OFF) of the TN cells 11a and 11b and the pixel position is shown in FIG.
(A) and (b). Thus, the TN cells 11a, 1
Four pixel positions are taken depending on the voltage state of 1b.

FIG. 3 is a diagram showing a relationship between four pixel positions. The first pixel position and the second pixel position are the same in the y direction and are shifted by Px / 2 in the x direction. The third pixel position and the fourth pixel position are the same in the y direction and are shifted by Px / 2 in the x direction. The first pixel position and the fourth pixel position are shifted by Px / 4 in the x direction, and Py is shifted in the y direction.
/ 2 offset. Note that Px and Py are the pitches of the pixels formed in the pixel display element.

FIGS. 4A and 4B are diagrams showing the relationship between the voltage applied to the LCD and the change in luminance over time, wherein FIG. 4A shows a conventional method and FIG. 4B shows this embodiment.

In FIG. 4A, a broken line indicates an ideal change in luminance, and a solid line indicates an actual change in luminance. Since the response speed of the LCD is slow, there is a delay before the actual luminance becomes the ideal luminance when moving from one field to the next field. In other words, it is affected by the immediately preceding field, and the waveform of the luminance change becomes blunt. this is,
When the luminance increases from the (n-1) field to the n-th field, it means that the actual luminance becomes smaller (darker) than the original luminance due to a response delay. Also,
When the luminance decreases from the nth field to the (n + 1) th field, it means that the actual luminance becomes larger (brighter) than the original luminance due to a delay in response.

On the other hand, in the present embodiment, as shown in FIG. 4B, when shifting from a certain field to the next field, the voltage actually applied is corrected so as to obtain a desired brightness. Here, the left diagram of FIG. 4B shows a change in luminance, and the right diagram shows a gamma characteristic of the luminance with respect to the applied voltage. In addition, a broken line in the left diagram of FIG. 4B represents an ideal change in luminance, and a solid line represents an actual change in luminance.

At the time of n fields, the luminance by ΔI− is higher than the ideal luminance waveform, and at the time of n + 1 fields, the luminance by ΔI + is lower than the ideal luminance waveform. Thereby, the brightness of the image in each field becomes equal to the desired brightness due to the integration effect of the observer's eyes. In order to change the luminance for ΔI− and ΔI +, it is sufficient to change the applied voltage for ΔV− and ΔV + from the characteristic of the applied voltage-luminance of the LCD shown in the right figure. The amount of the correction voltage is determined by the difference between the applied voltage of the video signal to be displayed and the video signal of the immediately preceding field, and is also affected by the gamma characteristics and response speed characteristics of the LCD.

FIG. 5 is a diagram showing the overall configuration of the image display device according to the present embodiment. Here, the FMD (Fa)
ce Mounted Display) is shown, but the same configuration can be obtained in a normal display device by replacing the optical system.

The video signal is input to a video signal processing circuit 30 including an image correction operation circuit, and the circuit 30 performs an image correction operation as shown in FIG. The signal corrected by the video signal processing circuit 30 is input to the LCD drive circuit 31. The LCD drive circuit 31 is connected to the 4
The LCD 34 is driven with a shift of a point pixel, and video signals are sequentially supplied corresponding to four kinds of pixel positions in one frame.

A video synchronization signal and a field discrimination signal are supplied from the LCD drive circuit 31 to the pixel shift control circuit 32. The pixel shift control circuit 32 drives the pixel shift optical element 36 in synchronization with the pixel shift of the LCD 34. As a result, the LCD 34 illuminated by the backlight 33 can display four times as many pixels as the number of pixels, and can be visually recognized through the eyepiece optical system 37.

The LCD 34 and the pixel shifting optical element 3
6, a temperature sensor 35 is provided. The detection signal of the temperature sensor 35 is supplied to the CPU 39 and fed back to the pixel shift control circuit 32 and the video signal processing circuit 30, so that the correction amount can be changed according to the temperature of the LCD portion. This is because the response characteristic of the LCD 34 changes depending on the temperature, so that it is necessary to change the correction amount depending on the temperature.

FIG. 6 is a diagram showing an electric circuit block of the image display device according to the present embodiment. In the figure, reference numeral 101 denotes a VBS terminal for inputting a composite signal. The input composite signal is converted into a Y / C signal by a Y / C separation circuit 102.
Separated. Either the Y / C separated signal or the Y / C separated signal input from the S terminal is selected by the selection switch 104.
And supplied to the decoder 105. In the decoder 105, an RGB signal and horizontal and vertical synchronization signals are created from the Y / C separation signal.

The RGB signals from the decoder 105 are processed by a gain control amplifier / enhancement circuit 106, and then processed by the A / D converters 11 corresponding to RGB.
1 (111a-111c) through double speed conversion memory 1
12 (112a to 112c). The double-speed conversion memory 112 reads a video signal at a normal 60 Hz.
Is converted to 120 Hz.
2 are supplied to the memory 113 (113a to 113c) and the image correction operation unit 114 (114a to 114c). The memory 113 is a FIFO memory for temporarily storing the previous field.

Here, the gain and the enhancement in the gain control amplifier / enhancement circuit 106 are controlled by the adjustment volume 107. Further, the A / D converter 1
The sampling time 11 is determined by the delay 108 and the selector 109.

The image correction calculation unit 114 has the memories 112 and 1
13 is compared with the video signal of the previous field and the video signal of the current field, and the video signal is corrected as described later. The output signal of the image correction operation unit 114 is a D / A converter 115 (115a to 115c).
Is supplied to an LCD drive circuit 116, and the circuit 117 drives the LCD 117.

Reference numeral 118 denotes a temperature sensor for detecting the temperature of the LCD 117, and 119 denotes the two TNs shown in FIG.
Cell (11a, 11b in FIG. 1), 121 is a timing generator for controlling the overall timing, 122
Is a timing generator for LCD, 123 is a timing generator for TN cell, 124 is PLL, 125 is CPU, and 126 is a data table storing data for image correction calculation.

The detection signal of the temperature sensor 118 is supplied to a buffer 127 for impedance conversion and the A / D converter 1.
The data is supplied to the CPU 125 through the CPU. CPU125
Then, data corresponding to the temperature is extracted from a plurality of types of data stored in the data table 126 and supplied to the image correction calculation unit 114.

The horizontal and vertical synchronizing signals (VD, HD) and the signal (E / O) for selecting the odd field and the even field from the decoder 105 are supplied to the timing generator 121, and
A signal (1/2) for selecting between the first subfield and the second subfield is supplied from 21 to the timing generators 122 and 123 together with the E / O.

The decoder 105 to the CPU 125
, An NTSC / PAL discrimination signal is supplied. CP
In U125, the correction amount is changed depending on NTSC or PAL.

Next, what kind of calculation is performed by the image correction calculation unit 114 will be described. First, Xn: current field data (0-255) Xn-1: previous field data (0-255) Xn ': corrected current field data (0-255) ΔX = Xn-Xn-1. Here, 0 means black, and 255 means white.

There are the following three correction methods.

(1) When | ΔX | <b Xn ′ = Xn (1) This means that no correction is performed when the difference between the current field and the previous field is small.

(2) When ΔX ≧ b Xn ′ = Xn + a ₁ (ΔX−b) ^1/2 · Xn / 255 (2) (3) When ΔX ≦ −b Xn ′ = Xn ₋ a ₂ (ΔX −b) ^1/2 · Xn / 255 (3) where, a ₁ : proportional constant 1 (a ₁ ≧ 0) a ₂ : proportional constant 2 (a ₂ ≧ 0) b: clip value Although the proportional constants 1 and 2 vary depending on the LCD, a ₂ > a ₁ was obtained in the LCD tested by the present inventors.

FIG. 7 is a characteristic diagram showing the correction amount. The horizontal axis shows the difference ΔXn between the previous field and the current field, and the vertical axis shows the correction amount. Xn is larger and ΔXn
Is larger, the correction amount is larger.

FIG. 8A is a diagram showing a more detailed electric circuit block of the image correction operation unit 114. The image correction operation unit 114 includes a subtracter 51 for obtaining a difference ΔXn between the previous field and the current field, a lookup table 52 for outputting a correction value according to the output of the subtracter 51,
The multiplier 53 multiplies the signal Xn of the current field by (1/255), and the correction value from the lookup table 52 is (X
(n / 255), and an adder 55 for adding the signal Xn of the current field to the output of the multiplier 54.

The lookup table 52 stores a correction value for ΔX.
A correction value corresponding to X is output. Specifically, FIG.
As shown in (b), ΔX is an address value, and a correction value a calculated in advance in accordance with this address value
(ΔX−b) ^1/2 is stored, and a correction value (table value) corresponding to the address value is output.

A plurality of types of tables are prepared in the image correction data table 126. The CPU 125 determines which table to use in accordance with the temperature information and the like, and uses the selected table as the image correction calculator 114. Is stored in the lookup table 52.

As a data table, the image correction data may not be tabulated as numerical data, but a correction data may be obtained by the CPU 125 having a function data table 136 and performing four arithmetic operations.

As described above, the data of the correction value to be stored in the lookup table 52 must be changed according to the temperature of the LCD, and the data may be destroyed by static electricity. Fifteen
It is desirable to refresh every second.

The data is sent from the image correction data table 126 to the look-up table 52 during a period in which the image correction calculation unit 114 is not performing a calculation process, specifically, during a vertical blanking period. However, since all data cannot be sent in one vertical blanking period, the data is divided and sent. As a method of division, a predetermined number of continuous (0 to 9/10 to 19/20 to 29 / ...) or thinning (0, 10, 20, ... / 1, 11, 21, ... / 2, 12, 22, ...).

FIG. 9 is a characteristic diagram for explaining that the response characteristic of the LCD differs depending on the temperature. (A) is a conventional method, in which the response speed increases as the temperature increases, and the response speed decreases as the temperature decreases. In other words, the response speed decreases as the temperature decreases, and the deviation of the actual luminance from the ideal luminance increases.

On the other hand, in the present embodiment, as shown in (b), by decreasing ΔI as the temperature becomes lower, that is, by increasing the correction amount, the correction is made in consideration of the change in the response speed due to the temperature change of the LCD. And more reliable correction can be performed.

FIG. 10 is a characteristic diagram for explaining that the correction amount differs between NTSC and PAL. NTSC
And PAL have different frame frequencies, NTSC has a field frequency of 60 Hz, and PAL has a field frequency of 25 Hz.

Since the frequency of the PAL shown in FIG. 10B is lower than that of the NTSC shown in FIG. 10A, the flat portion of the luminance change shown by the solid line in the figure is longer. That is, the correction amount is small. Therefore, it is desirable that the correction amount of PAL be smaller than that of NTSC.

FIG. 11 is a sectional view showing the arrangement of a temperature sensor. In the figure, reference numeral 71 denotes an electric board on which an IC or the like is mounted, and a thermistor 72 as a temperature sensor is installed on the back side of the electric board 71. A backlight 73 is provided on the back surface of the electrical board 71, and an LCD 74 is provided below the backlight 73. The LCD cover 75 is for masking so that unnecessary light does not leak. LC
A pixel shift optical element 77 is provided below D74 with a predetermined space 76 therebetween. These parts 74, 7
Reference numerals 5 and 77 denote an adhesive which is put into the housing 78. A prism 77 is provided below the prism 77.

The space 76 between the LCD 74 and the pixel shifting optical element 77 is continuous with the space where the thermistor 72 is installed.
Temperature can be measured with high accuracy.

Here, when using two display devices corresponding to both eyes as in the case of FMD, the thermistor 72 may be arranged in only one eye. The thermistor 72 is installed in the space 76 where the surface of the LCD and the surface of the pixel shifting optical element are exposed.
7 may be arranged so as to be in direct contact therewith.

The response speed of an LCD is sensitive to a change in temperature. Therefore, the correlation between the surface temperature of the LCD and the thermistor is obtained. In an actual use scene, the drive timing of the TN cell and the image correction amount are switched to the optimal settings, assuming the temperature of the LCD surface from the value of the thermistor.

The temperature detection by the thermistor is 10 to
An average value of 15 seconds may be used. Since fine temperature control is not required, switching may be performed, for example, by a change of 10 ° C. Further, the space between the optical system elements including the space is preferably a closed space to prevent dust.

(Second Embodiment) FIG. 12 is a diagram showing a main configuration of an image display device according to a second embodiment of the present invention.

Only a part of the pixels of the LCD 10 emit light in a certain light pattern, and the light is received by the optical sensor 91. Then, the light emission by the low-frequency drive and the light emission by the high-frequency drive are separately integrated by the integrator 92, and the respective integrated values are calculated by the difference calculator 93, whereby LC
The response speed of D10 is detected.

Specifically, first, as shown on the left side of FIG. 13, a low-frequency contrast is detected as a light-emitting pattern having a long light-dark cycle. The detection value in this case is
There is almost no relation to the response speed of the LCD, and it changes depending on the brightness of the backlight and the like. Next, as shown on the right side of FIG. 13, the high-frequency contrast is detected in a pattern with a short light-dark cycle (for example, 120 Hz). This high-frequency contrast strongly depends on the response speed of the LCD, and decreases as the response speed decreases.

Accordingly, a signal corresponding to the response speed of the LCD can be obtained from the difference between the high-frequency contrast and the low-frequency contrast without being affected by a change in the luminance of the backlight or the like. If the correction amount is controlled based on this signal, it is possible to always perform the correction with high accuracy even if the temperature of the LCD changes.

The present invention is not limited to the above-described embodiments, but can be implemented in various modifications without departing from the scope of the invention.

For example, the optical axis displacement means for periodically displacing the optical axis of the light emitted from the display section of the image display element includes:
The configuration shown in FIG. 1 using the TN cell and the birefringent plate is not limited at all, and can be appropriately changed according to the specifications. Further, the positions at which the pixels are shifted are not limited to four points, and can be changed as appropriate.

[0065]

As described above in detail, according to the present invention, the video signal correcting means is provided in the pixel shift method, and the accumulated amount of luminance displayed on the image display element during one field period of the video signal becomes a predetermined amount. By correcting the video signal as described above, even when the number of pixels of the display element is substantially increased by shifting the pixels, it is possible to correct the delay of the response speed of the display element, and further improve the resolution. Can be measured.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a pixel shifting optical element used in an image display device according to a first embodiment.

FIG. 2 is a diagram showing a relationship between a voltage application state (ON / OFF) of a TN cell and a pixel position.

FIG. 3 is a diagram illustrating a relationship between four pixel positions due to pixel shifting.

FIG. 4 is a diagram illustrating a relationship between a voltage applied to an LCD and a change in luminance over time.

FIG. 5 is a diagram illustrating an overall configuration of the image display device according to the first embodiment.

FIG. 6 is a diagram showing an electric circuit block of the image display device according to the first embodiment.

FIG. 7 is a characteristic diagram illustrating a change in a correction amount according to the first embodiment.

FIG. 8 is a diagram showing a more detailed electric circuit block of the image correction calculation unit in FIG. 6;

FIG. 9 is a characteristic diagram for explaining that response characteristics of an LCD differ depending on temperature.

FIG. 10 is a characteristic diagram for explaining that a correction amount differs between NTSC and PAL.

FIG. 11 is a cross-sectional view illustrating a configuration example of an arrangement of a temperature sensor.

FIG. 12 is a diagram showing a main configuration of an image display device according to a second embodiment.

FIG. 13 is a diagram illustrating an example of a light emission pattern according to the second embodiment.

[Explanation of symbols]

10, 34, 74, 117 Liquid crystal display element (LCD) 11 (11a, 11b), 119 TN cell 12 (12a, 12b, 12c) Birefringent plate 20, 36, 77 Pixel shifting optical element 30 Image Signal processing circuit 31 LCD drive circuit 32 Pixel shift control circuit 33, 73 Backlight 35, 72, 118 Temperature sensor 37, 77 Eyepiece optical system 39, 125 CPU 52 Lookup table 71 Electrical board 75 LCD cover 76 Space 78 Case 91 Optical sensor 92 Integrator 93 Difference calculator 112 (112a, 112b, 112c) Double speed conversion memory 113 (113a, 113b, 113c) FIFO memory 114 ( 114a, 114b, 114c)... Image correction calculation section 126... Image correction data table 13 ... function data table

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) G02F 1/133 580 G02F 1/133 580 G09G 3/36 G09G 3/36 F-term (Reference) 2H093 NA06 NC16 NC54 NC54 NC57 NC65 ND02 ND05 ND07 ND34 NE06 NF05 5C006 AA01 AA16 AA22 AF13 AF44 AF46 AF53 AF78 AF81 AF83 BB11 BF02 BF07 BF09 BF15 BF24 BF25 BF26 BF28 BF38 FA15 FA19 FA25 FA54 FA56 5C080 AA05 EA03 AJ05 EA03 DD07

Claims (10)

[Claims] 1. A pixel display element having a display section in which a plurality of pixels are regularly arranged, and an optical axis of light emitted from the display section of the image display element is periodically displaced based on a video signal input. Optical axis displacement means for varying the display position of the same pixel in a plurality of fields in one frame; and image display control for displaying different images on the image display element in synchronization with the displacement of the optical axis by the optical axis displacement means. Means, and video signal correction means for correcting the video signal so that the cumulative amount of luminance displayed on the image display element during one field period of the video signal is a predetermined amount. Image display device. 2. The video signal correction means according to claim 1, wherein said video signal correction means is configured to output the video signal based on a difference between a video signal level of a current field to be displayed by at least one pixel of the image display element and a video signal level of a previous field. 2. The image display device according to claim 1, wherein the image is corrected. 3. The image display element is configured such that display luminance can be controlled by an applied voltage level, and the video signal correction means is configured to be able to refer to a voltage level corresponding to the display luminance. 2. The image according to claim 1, further comprising a voltage reference unit, wherein the video signal is corrected based on a voltage level referred to by the applied voltage reference unit so that the accumulated amount of the luminance becomes a predetermined amount. Display device. 4. The image display device according to claim 3, wherein said applied voltage reference means is a look-up table. 5. The image display device according to claim 4, wherein data stored in said look-up table is updated based on a predetermined condition. 6. The image display device according to claim 5, wherein the look-up table is updated during a vertical blanking period of an input video signal. 7. An image display device, comprising: temperature detecting means for detecting an environmental temperature of the image display element itself or an environment temperature in the vicinity of the element; wherein the video signal correcting means changes a correction amount based on the temperature detected by the temperature detecting means. 3. The image display device according to claim 2, wherein: 8. The video signal correcting means according to claim 1, wherein a characteristic of a correction amount is changed depending on whether a difference between a video signal level of a current field and a video signal level of a previous field is positive or negative. Item 3. The image display device according to Item 2. 9. An image display apparatus according to claim 2, wherein said video signal correction means changes the characteristic of the correction amount based on the format of the input video signal (video signal standard). 10. An image display device comprising: a display element for detection for performing display in a predetermined pattern; and light detection means for detecting display luminance of the display element for detection. 2. The image display device according to claim 1, wherein the controller determines a response performance of the image display device from a detection result of the light detector, and controls a correction amount based on the determination result.