WO2001057836A1

WO2001057836A1 - Image display method, image display apparatus and control circuit for use therein

Info

Publication number: WO2001057836A1
Application number: PCT/JP2000/000617
Authority: WO
Inventors: Tomoki Kobori; Nobuaki Kabuto
Original assignee: Hitachi, Ltd.
Priority date: 2000-02-04
Filing date: 2000-02-04
Publication date: 2001-08-09
Also published as: JPWO2001057836A1

Abstract

An image display apparatus for displaying an image by projecting light corresponding to an image signal from a display device to a display unit. The image display apparatus includes an illuminating optical system for emitting light from a light source, a display device irradiated with light from the illuminating optical system and adapted for controlling the amount of reflected or transmitted light projected, a drive circuit for driving the display device, and a detection system for detecting information on the intensity of light from the light source to output the information on the integral amount of light from the start of the image display within a predetermined display period according to the information. By driving the drive circuit according to the output signal of the detection system, the reflection time or transmission time of the light in the display device is controlled, and thereby the amount of reflected or transmitted light is controlled to display an image on the display unit. Thus, the variation of the luminance level of the displayed image can be substantially constant to reduce the flicker phenomenon and to enhance the image quality.

Description

Detail

Image display method, image display device, and control circuit used therefor

The present invention relates to an image display technique in which an image is formed by irradiating light from a light source side to a display device such as a transmissive or reflective liquid crystal panel or a panel having a minute reflective mirror. Background art

A conventional projection display device as an image display device that uses a liquid crystal panel as a display device uses a small-sized liquid crystal panel, so it can be used as a CRT (cathode ray tube) device. It is easier to achieve miniaturization and weight reduction. Also, unlike the CRT method, it is not affected by size distortion or terrestrial magnetism, so it is easy to adjust the compatibility. Also, wide color reproducibility can be realized by the characteristics of the light source and the optical design. In addition, the response speed of the liquid crystal to improve the resolution of moving images has been improved, the contrast has been improved, the light utilization has been improved through the effective use of extraneous deflection components, etc., and the pixel aperture ratio has been improved. There are also many efforts to improve performance.

In addition, as a projection type display device using a reflective display device, a small reflective mirror was used to improve contrast and light utilization. A method using a device called DMD (Digital Micromirror Device) (registered trademark of Texas Instruments) {\ ¾ X--USP5442411, USP5280277, USP5668611, USP5680180, Kaiping 1 0 — 4 8 542). In this method, the reflection surface of a micromirror is two-dimensionally arranged on the cells of a memory array, Force controls the tilt of the reflecting surface of the micro mirror to change the direction of light reflection from the light source in the on / off state.In the on state, the reflected light is incident on the projection lens, and in the off state, the light is projected. by letting not to enter the lens and to display the image Rereru ₌

In this DMD, the gradation expression is based on the on / off time of a micromirror whose response speed is on the order of 10 to 20 μsec within the frame period (for example, 16.7 to 20 msec). Controlling, and the person viewing the image, integrates the light emission time from the visual reaction speed as an analog value within the frame period so that the gradation can be recognized.

In addition, R, G, and B can be reproduced in a variety of applications, such as when a single DMD is used to represent time-division, or when three DMDs are provided for each color to secure the luminance level. The configuration is determined accordingly. In addition, since the aperture ratio of light in this method is as high as 90% or more, the amount of heat energy generated due to the reflection loss of light can be reduced, and the luminance level of the image can be easily improved by increasing the luminance of the light source.

In the case of a projection display device using such a display device, the light source must be a point light source from the viewpoint of light-collecting properties, be superior in spectrum spectroscopy, be highly efficient light-emitting characteristics, It is desirable to have a long life and, above all, to obtain a uniform light intensity with less emission unevenness. In practice, xenon lamps and metal halide lamps are used. In addition, the wavelength distribution unevenness of the metal halide lamp (weak red and strong blue and green) is corrected by optically correcting the wavelength distribution. In the case of display devices such as liquid crystal panels and reflective display devices, control is performed assuming that light is emitted with a uniform light intensity as a light source.

Fig. 3 shows a configuration example of a conventional projection display using the display device method. 1 is an input terminal for inputting video signals, and 2 and 3 are Synchronization signal input terminal for inputting vertical and horizontal synchronizing signals of signal, 4 is timing generation unit that generates various timing signals, 5 is lamp drive timing generation unit, 6 is lamp drive unit, and 7 is light source Lamps, 22 and 23 are optical units composed of various types of lenses, 21 is an image display device (display device) such as a liquid crystal panel or reflective display device, and 24 is an image projection device. The time distribution setting section for setting the time distribution when driving the image display device (display device) 21, and the time distribution setting section 200 for setting the time distribution when driving the image display device (display device) 21. This is an image display device control unit that generates various drive signals for the image display device 21 according to the following formula.The adaptive time allocation control method for the reflective display device is 4 bits (from the most significant bit to D 16, 2, 1, 0) (0-15 level) The unit period for performing gradation expression is one sequence. If the luminance level from the light source is always constant, the time distribution is determined for each bit in proportion to the expression gradation amount per bit. That is, the time distribution of 8/15, 4/15, 2/15, and 1/15 is determined for D 3 to 0, respectively. On the other hand, according to the corresponding bit information (1 or 0) of the input gradation information (image information) Video, the desired gradation level can be obtained by performing the projection on / off in one sequence. Let's do it.

Generally, in the case of an AC lamp, the brightness level changes greatly (ringing) due to the switching of the driving direction of the lamp drive current, and it takes time for the lamp to converge to a constant level after switching. In addition, the brightness level of the image on the screen changes due to uneven light emission and optical path length fluctuation caused by changes in the operating environment, driving conditions, arc jump points between the electrodes, etc. The image quality deteriorates as a force phenomenon (blinking phenomenon). Conventionally, as a remedy, the lamp driving method has been improved, the lamp material has been improved, and light emission unevenness has been allowed on the optical structure, such as a lens, so that the amount of change in the brightness level is not more than a predetermined level. Designed with a higher tolerance, it responds. In addition, during the ringing period when the luminance level changes greatly, the image display device (display device) is controlled (off) to avoid using the light source:

However, in the conventional control technologies, we can not get enough suppressed the brightness level changes, also designed co be sampled 'manufacturing co be sampled increases also invited to Rereru _c

SUMMARY OF THE INVENTION It is an object of the present invention to improve the disadvantages of the above-described conventional technology, reduce the flicker phenomenon by making the amount of change in luminance level in a display unit such as a screen substantially constant, and improve the luminance level. It is to provide an image display technology that can be obtained. Disclosure of the invention

In order to achieve the above object, the present invention has the following configuration: That is, in the first invention,

In an image display method for displaying an image by projecting light corresponding to an image signal from a display device to a display unit, a step of detecting intensity information of light from a light source side and forming a control signal based on the information, Driving the display device on the basis of a signal for use, and displaying an image by controlling a reflection time or a transmission time of light in the display device based on light intensity information from the light source side. Configuration.

In the second invention,

In an image display method for displaying an image by projecting light corresponding to an image signal from a display device to a display unit, a step of detecting intensity information of light from a light source side and forming a control signal based on the information, Integrating the light amount within a predetermined display period based on the application signal and outputting integrated light amount information; and driving the display device based on the integrated light amount information. Display device based on the integrated light amount information The image display is performed by controlling the reflection time or transmission time of the light at the time.

In the third invention,

In an image display method for displaying an image by projecting light corresponding to an image signal from a display device to a display unit, a step of detecting intensity information of light from the light source side and forming a control signal based on the information, A step of integrating the light amount of a predetermined display period 基づき based on the use signal and outputting integrated light amount information; a step of driving the display device based on the integrated light amount information; and a step of determining a light amount required for image display. Comparing the information on the amount of light necessary for the image display with the above-mentioned integrated light amount information, and performing image display by controlling a reflection time or a transmission time of light in the display device based on the integrated light amount information. When the integrated light amount reaches the required light amount, the projection of the light onto the display unit is stopped.

In the fourth invention,

An image display method for displaying an image by projecting light corresponding to an image signal from a display device to a display unit, comprising the steps of: detecting intensity information of light from a light source side and forming a control signal based on the intensity information; Integrating the light amount within a predetermined display period based on the application signal and outputting integrated light amount information; driving the display device based on the integrated light amount information; and controlling the signal level of the input image signal. And controlling the reflection time or transmission time of light in the display device based on the integrated light amount information. Also, controlling the input image signal level based on the integrated light amount information to display an image on the display unit. It is configured to do so.

In the fifth invention,

In an image display method for displaying an image by projecting light corresponding to an image signal from a display device to a display unit, light intensity information from a light source side is detected and detected. Forming a control signal based on the control signal; generating pseudo waveform information based on the control signal; comparing light intensity information from the light source based on the control signal with the pseudo waveform information; A step of extracting the waveform difference information; a step of determining the waveform generation conditions of the pseudo-waveform generation unit in accordance with the waveform difference information; Determining the distribution of the waveforms in advance in the direction of decreasing the difference value of the waveform difference information, and determining in advance the display device based on the pseudo waveform information corresponding to the determined waveform generation conditions. A distribution condition of the amount of reflection or transmission of light is determined, and the display device is driven according to the determined distribution condition to perform image display.

In the sixth invention,

In an image display method for displaying an image by projecting light corresponding to an image signal from a display device to a display unit, a step of detecting intensity information of light from a light source side and forming a control signal based on the intensity information; Generating pseudo-waveform information based on the control signal; comparing the intensity information of light from the light source side based on the control signal with the pseudo-waveform information to extract waveform difference information; Determining a waveform generation condition of the pseudo-waveform generation unit in accordance with the information; determining in advance the distribution of the amount of reflection or transmission of light on the display device based on the pseudo-waveform information; Calculating a difference between the information and the pseudo-waveform information to obtain an excess or deficiency of the pseudo-waveform information with respect to the reference light intensity information. The waveform generation conditions are determined in a direction to reduce the difference value of the information, and pseudo-waveform information corresponding to the determined waveform generation conditions and distribution conditions of the amount of reflection or transmission of light in the display device are determined in advance according to the amount of excess or deficiency. The display device is driven and an image is displayed according to the determined distribution conditions. The configuration shall be as follows.

In the seventh invention,

In an image display device for displaying an image by projecting light corresponding to an image signal from a display device to a display unit, a display device for controlling a reflection amount or a transmission amount of light emitted from a light source side, and the display device A drive circuit for driving the

A detection system for detecting intensity information of light from the light source side and forming a control signal;

Controlling the reflection time or transmission time of light in the display device by the drive circuit based on the control signal of the detection system, thereby controlling the amount of reflection or transmission to display an image. The configuration is as follows.

In the eighth invention,

In an image display device that displays an image by projecting light corresponding to an image signal from a display device to a display unit, an illumination optical system that emits light from a light source side, and light from the illumination optical system is illuminated. A display device for controlling the amount of reflection or transmission of the received light, a drive circuit for driving the display device, detecting the intensity information of the light from the light source side, and integrating within a predetermined display period based on the information. And a detection system that outputs information on the amount of light. The driving circuit is driven based on an output signal of the detection system, and the amount of reflection or the amount of reflection is controlled by controlling the reflection time or transmission time of light in the display device. An image is displayed on the display unit by controlling the transmission amount.

In the ninth invention,

In an image display device that displays an image by projecting light corresponding to an image signal from a display device to a display unit, an illumination optical system that emits light from a light source side, and light from the illumination optical system is illuminated. A display device for controlling the amount of reflection or transmission of the light, a driving circuit for driving the display device, A detection system that detects intensity information of light from the light source side and forms a control signal, and a calculating unit that integrates a light amount within a predetermined display period based on the control signal of the detection system, A configuration in which an output signal of the integration unit is input to the drive circuit to control a reflection time or a transmission time of light in the display device, thereby controlling a reflection amount or a transmission amount to display an image on the display unit. In the tenth invention,

In an image display device that displays an image by projecting light corresponding to an image signal from a display device to a display unit, an illumination optical system that emits light from a light source side, and light from the illumination optical system is illuminated. A display device for controlling the amount of reflection or transmission of the received light, a drive circuit for controlling and driving the display device, detecting information on the intensity of light from the light source side, and integrating within a predetermined display period based on the information. A detection system that outputs light amount information, a light amount determining unit that determines light amount required for image display, and a comparing unit that compares information on the light amount required for image display with the information on the integrated light amount, The drive circuit is driven based on the information on the integrated light amount of the detection system, and the amount of reflection or transmission is controlled by controlling the reflection time or transmission time of light on the display device, and an image is displayed on the display unit. It performed, the integrated quantity of light is configured to stop the projection of light onto the display unit from the display device based on the output signal of the upper Symbol comparing section when it reaches to the required amount.

In the eleventh invention,

In an image display device that displays an image by projecting light corresponding to an image signal from a display device to a display unit,

An illumination optical system for emitting light from the light source side, a display device for irradiating the light from the illumination optical system and controlling the amount of reflection or transmission of the emitted light, and a drive circuit for controlling and driving the display device And the intensity of light from the light source side A detection system that detects information and forms a control signal, a summation unit that integrates the light amount within a predetermined display period based on the control signal of the detection system, and outputs information on the integrated light amount, necessary for image display A light amount determining unit for determining an appropriate amount of light; and a comparing unit for comparing the information on the amount of light necessary for displaying the image with the information on the integrated light amount. By driving, the amount of reflection or transmission is controlled by controlling the reflection time or transmission time of light in the display device to display an image on the display unit, and the integrated light amount is adjusted to the required light amount. When it reaches, the projection of the light from the display device to the display unit is stopped based on the output signal of the comparison unit. In the first and second inventions,

In an image display device that displays an image by projecting light corresponding to an image signal from a display device to a display unit, an illumination optical system that emits light from a light source side, and light from the illumination optical system is illuminated. A display device for controlling the amount of reflection or transmission of the received light, a drive circuit for controlling and driving the display device, and a detection system for detecting intensity information of the light from the light source side and forming a control signal. An integration unit that integrates the light amount within a predetermined display period based on the control signal of the detection system and outputs information on the integrated light amount; and an amplitude control unit that controls the signal level of the input image signal. The amount of reflection or transmission is controlled by controlling the reflection time or transmission time of the light in the display device based on the output signal of the display device, and the amplitude is controlled based on the output signal of the integrating unit. And controls the input image signal level control section is configured to perform an image displayed on the display unit.

In the thirteenth invention,

In an image display device that displays an image by projecting light corresponding to an image signal from a display device to a display unit, an illumination optical system that emits light from a light source side, and light from the illumination optical system is illuminated. Of reflected or transmitted light A display device for controlling the display device; a drive circuit for controlling and driving the display device; detecting light intensity information from the light source side, integrating light amounts within a predetermined display period based on the intensity information, and calculating information on the integrated light amount. A detection system for outputting, a light amount determining unit for determining the light amount required for image display, a comparing unit for comparing the information on the light amount required for image display with the information on the integrated light amount, and a signal of a human-powered image. And an amplitude control unit for controlling a level, wherein the reflection amount or transmission amount is controlled by controlling the reflection time or transmission time of light in the display device by the drive circuit based on the output signal of the detection system. And, based on the output signal of the detection system, the amplitude control section controls the input image signal level to display an image. When the integrated light quantity reaches the required light quantity, the output of the comparison section is performed. To force signal Hazuki _3, configured to stop the projection of light onto the display unit from the display Debaisu

In the fourteenth invention,

In an image display device that displays an image by projecting light corresponding to an image signal from a display device to a display unit, an illumination optical system that emits light from a light source side, and light from the illumination optical system is illuminated. A display device for controlling the amount of reflection or transmission of the received light, a drive circuit for controlling and driving the display device, and a detection system for detecting intensity information of the light from the light source side and forming a control signal. A pseudo-waveform generator that generates pseudo-waveform information based on the control signal of the detection system; light intensity information from a light source based on the control signal of the detection system; and a pseudo-waveform of the pseudo-waveform generator A comparison unit that compares information with the information to extract waveform difference information; a first determination unit that determines a waveform generation condition of the pseudo waveform generation unit according to the waveform difference information extracted by the comparison unit; Up based on pseudo waveform information A second determining unit that determines in advance the distribution of the amount of reflection or transmission of light in the display device, and controls the first determining unit to reduce the difference value of the waveform difference information. Define the generation conditions, The second determining unit is controlled based on the pseudo waveform information corresponding to the obtained waveform generation condition, and the distribution condition of the amount of reflection or transmission of light of the display device is determined in advance, and the drive circuit determines the distribution condition based on the distribution condition. The above display device is driven to display images.

In the fifteenth invention,

In an image display device that performs image display by projecting light corresponding to an image signal from a display device to a display unit,

An illumination optical system that emits light from the light source side, a display device that illuminates the light from the illumination optical system and controls the amount of reflection or transmission of the emitted light, and controls and drives the display device. A drive circuit; a detection system for detecting intensity information of light from the light source side to form a control signal; a pseudo-waveform generation unit for generating pseudo-waveform information based on the control signal of the detection system; A comparison unit for comparing the intensity information of the light from the light source side based on the control signal of the system with the pseudo waveform information of the pseudo waveform generation unit and extracting waveform difference information; A first determination unit that determines a waveform generation condition of the pseudo waveform generation unit according to the waveform difference information; and a second determination unit that determines in advance the distribution of the amount of reflection or transmission of light in the display device based on the pseudo waveform information. Decision part and reference light intensity An integrating unit for integrating the difference between the information and the pseudo-waveform information to obtain an excess or deficiency of the pseudo-waveform information with respect to the reference light intensity information, and controlling the first determining unit to The waveform generation condition is determined in a direction to reduce the difference value of the waveform difference information, and the first and second waveform generation conditions are determined based on the pseudo waveform information corresponding to the determined waveform generation condition and the signal corresponding to the excess / deficiency amount of the integration unit.

A configuration in which the determination unit of (2) is controlled to determine in advance the distribution condition of the amount of reflection or transmission of light in the display device, and the driving circuit drives the display device to display an image based on the distribution condition. I do.

According to the present invention having such a configuration, the light emission characteristics of the lamp as the light source are as follows: The luminance level fluctuation (ringing component) of the light source that occurs when the lamp driving direction is switched, and the luminance level fluctuation (fluctuation) caused by the change in the optical path length due to the indeterminate electron jump position (arc jump position) between the electrodes. Even if there is a power component), the fluctuation of the luminance level can be detected with high accuracy, and the luminance level fluctuation is controlled by driving and controlling the image display device by time distribution according to the luminance level change. Can be equivalently absorbed, and a stable gradation image can be displayed ₌

Furthermore, even if there is a change in the lamp light amount due to the deterioration of the lamp with time, the change can be detected, and the image display of a stable gradation expression can be performed by the processing as in the embodiment. Become

In addition, since fluctuations in the brightness level of the light source are absorbed by the circuit side, the configuration for suppressing the flicker component in the optical system can be simplified, and costs such as design costs and component costs can be reduced. Can be reduced. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a block diagram showing an image display device according to a first embodiment of the present invention. FIG. 2 is a block diagram showing an image display device according to a second embodiment of the present invention. FIG. 4, a block diagram showing a conventional example of an image display device, FIG. 4, a waveform diagram supplementing the operation of the first embodiment, FIG. 5, a waveform diagram supplementing the operation of the second embodiment, FIG. 6 illustration, the image display device shown to block diagram of a third embodiment according to the present invention, FIG. 7 is for carrying out the _c invention is a waveform diagram for supplementing the operation of the third embodiment Best form

Hereinafter, the present invention will be described with reference to the accompanying drawings.

(First embodiment)

FIG. 1 shows a projection type display using a reflection type display device according to the present invention. FIG. 2 is a block diagram showing an embodiment of an image display unit in the display device. Here, although not shown in the block diagram of FIG. External CP).

Further, in this embodiment, a standard television broadcast mainly for displaying moving images is assumed as an input video signal, but for simplicity of description, the image frame frequency V A case in which sync is displayed as 5 OHz or 60 Hz will be described _{= The} present invention includes within the technical scope the case where an image frame rate for a human-powered image is converted.

A case will be described in which color reproduction is performed using three primary colors of red (R), green (G), and blue (B) as primary color components. In this embodiment, a system in which a reflective display device is provided for each color will be described.However, since the operation of each device is the same, a case where a reflective display device for any one color component is controlled is controlled. Will be described.

The image display device only needs to be capable of a gradation expression method by time distribution control (response speed is several tens / sec or less). For example, even when a ferroelectric liquid crystal is used, it is almost the same as this embodiment. It has a similar form.

Further, in the present embodiment, a light emitting type lamp driven by AC is used as a light source, but other light sources may be used.

Further, the number of times the lamp is switched in one cycle of the image frame frequency Vsync is not particularly specified, but may be determined based on the lamp performance. Here, for the sake of simplicity of description, a case where switching is performed for each image frame frequency Vsync is shown. In this embodiment, the details of the optical system such as the lens configuration will not be described.

In FIG. 1, 1 is an input terminal for inputting a video signal, and 2 and 3 are each a sync signal input for inputting a vertical sync signal V sync and a horizontal sync signal H sync. Terminals, 4 is a timing generation circuit, 5 is a lamp drive timing generation circuit, 6 is a lamp drive circuit, 7 is a lamp, and 22 and 23 are optical units 21 each composed of various lenses. Is an image forming device (display device) such as a liquid crystal panel or other panel, 24 is a screen for projecting an image, 20 is an image forming device control circuit, and 8 is a lamp luminance level. A light amount detection circuit that detects light intensity information, and is configured to include a detector such as a photo sensor. 18 and 19 are amplifier circuits (AMP) that convert analog values into digital values, and AD converters ( ADC), 12, 13, and 14 are the first, second, and third waveform generation circuits, 15 and 16 are the multiplication circuits and addition circuits, 17 is the waveform comparison circuit, and 9 is the waveform generation circuit. A condition determining circuit, 10 is a ringing amount integrating circuit, and 11 is a time distribution determining circuit.

FIG. 4 shows a schematic waveform diagram of a main processing block of a projection display device using a reflection mirror according to the present invention, and a mirror diagram for expressing color gradation of pixels. The concept of time distribution control for controlling on / off time will be described. The operation will be described with reference to FIG. 1 and FIG.

The timing generation circuit 4 uses the input vertical synchronization signal Vsync (V cycle) as a reference to start the various sequence start signals 4a, the PWM start timing signal 4b, and the lamp drive start timing. And generates and outputs address information corresponding to various signals (not shown). The lamp drive is synchronized with the lamp drive start timing signal 4c and determines the switching timing of the lamp AC drive by the lamp drive timing generation circuit 5. The lamp drive is performed at the timing (for example, rising edge) of the lamp synchronization signal 5a. The circuit 6 switches the driving direction of the lamp driving current 6a. The lamp 7 is driven by the lamp driving current 6a to emit light. The light intensity detection circuit 8 outputs an analog value corresponding to the brightness level of the lamp 7, and converts the analog value to a digital value by the AMP 18 and the ADC 19, thereby obtaining the brightness level of the lamp as the light source. 1 δ Bell (light intensity information) 1 9 3 _{= In} this case, it is desirable that the light amount detection circuit 8 be of high sensitivity that can sufficiently follow the instantaneous change in the luminance level of the lamp 7. As shown by 19a in Fig. 4, the typical lamp luminance level is not immediately stabilized at the timing when the lamp drive current is switched to 6a, but repeats overshoot and undershoot. Eventually, a ringing waveform falls within the stable range. It is necessary to detect fluctuations in the brightness level

A description will be given of a pseudo-waveform generation operation for copying a change in the luminance level of the lamp detected by the light amount detection circuit 8.

First, the waveform comparison circuit 17 compares the waveform of the pseudo waveform〗 6a with the output waveform 19a of the light amount detection circuit, and outputs the residual error component as error information Er.

The waveform generation condition determination circuit 9 determines a pseudo waveform generation condition so as to reduce the error information Er which is a feedback amount. In this case, taking into account the processing delay in each processing block, the phase condition Ph and the lamp drive which are determined so that the phase of the pseudo waveform 16a coincides with the phase of the light quantity detection circuit output waveform 19a in consideration of the processing delay in each processing block. The reference luminance level I amp proportional to the dynamic current, the frequency component f of the ringing waveform component (period T r = l Z i), and the peak value D of the ringing component as conditions to determine the attenuation condition of the ringing waveform Define p and the decay time D tim until the waveform is stabilized. As a result, the first waveform generation circuit 12 outputs a reference waveform base (rectangular wave) with the timing and amplitude according to the phase condition Ph and the reference luminance level lamp. The second waveform generation circuit 13 outputs a sine wave sin having a frequency component ί. In the third waveform generation circuit 14, the peak value D p and the decay time D tim make the decay wave d υ Output mp. The multiplier 15 multiplies the sine wave sin and the attenuated wave dump to output (output signal 15a), and the adder 16 adds and outputs the reference waveform base and 15a. Then, a pseudo waveform 16a of the luminance level is generated.

In addition, this feedback control process assumes that the brightness level waveform at each lamp synchronization timing does not differ greatly, and the obtained error information Er is used as the pseudo waveform at the next ramp synchronization timing. Also used for generation.

Above indicated Fi Ri by one Dobakku control, to optimize the waveform generation condition pseudo- every lamp synchronous tie Mi ring, _c to replicate the lamp brightness waveform 1 9 a pseudo waveform 1 6 a

Here, when waveform generation is performed digitally using a DSP (digital 'signal' processor) or the like, the degree of freedom in waveform generation can be increased. Of course, an analog circuit configuration is also acceptable.

Next, an adaptive time allocation control method for a reflective display device will be described. Here, for simplicity of explanation, a case where 16 gray scale expression (0 to 15 levels) is shown using 4 bits (in the order of D3, 2, 1, 0 from the most significant bit). . The unit period for performing gradation expression is one sequence.

Here, if the luminance level from the light source is always substantially constant, the time distribution is determined for each bit in proportion to the expression gradation amount per bit. In other words, the time distribution of 8/15, 4/15, 2/15, 1/15 is defined for 0 3 to 0 V-TIM, and the input gradation information (image information) V ideo According to the corresponding bit information (1 or 0), the desired gradation level is obtained by ON / OFF control of the image forming device (display device).

As described above, in the gradation expression method based on the time distribution control described above, the ringing amount integrating circuit 10 required the attenuation of the ringing component. Within the period D tim, the ratio rate of the total light emission amount of the pseudo luminance level 16 to the reference luminance level lamp is calculated and output.

The time distribution determining circuit 11 converts the light emission amount per bit from the reference time distribution information determined assuming the reference luminance level. In addition, the time to obtain the same amount of light emission is determined for each bit from the actual total light emission amount rate rate. This ensures that, _c defining the adaptively time allocation V- TIM

For example, as shown by 11a in Fig. 4, when the ringing component converges within the time distribution allocated to the most significant bit (D3), the ratio of the total emission amount rate becomes larger or smaller. The length of the time distribution is determined so that the total amount of light emission is equal. In this case, the time distribution of the remaining bits (D2-0) is the same as the reference time distribution.

In one example, the ringing amount integrating unit 10 outputs the integrated light emission amount 11b from the sequence start with a value obtained by normalizing the pseudo waveform level 16a with Iamp. The time distribution determining circuit 11 compares the required light emission amount determined in advance from the light emission period with the integrated light emission amount 11b for each time distribution allocated to each bit, and determines the bit-by-bit value for each bit at the same time. Time distribution V-TIM may be determined so as to end use of light. The image is projected on the display unit by driving the image display device (display device) by the image display device control circuit 20 according to the time distribution V—T I M.

According to the first embodiment, even when the luminance level (light intensity information) of the lamp as the light source changes, the amount of change in the luminance level can be accurately estimated, and the change in the luminance level can be obtained. Time distribution control can be performed in accordance with this, and since the image display device absorbs the fluctuation of the luminance level equivalently, it is possible to obtain an image whose luminance level on the display section is substantially constant.

Furthermore, by improving the response speed of the feedback system, even if the luminance level fluctuates irregularly, the control can immediately follow the fluctuation. It is also possible to make it.

As described above, even when there is a certain change in the brightness level and a ringing component, the amount of change in the brightness level in the display unit such as a screen can be made substantially constant to reduce the fritting force phenomenon. ₌ Follow the deterioration of light sources such as lamps over time, and compensate for this. 改善 Improvement of awards, and furthermore, design costs and manufacturing costs by reducing the design accuracy of optical systems It is also possible to reduce the amount of waste.

(Second embodiment)

FIG. 2 is a block diagram showing an embodiment (second embodiment) using a reflective display device. FIG. 5 shows a waveform diagram of the present configuration. In the second embodiment, a three-color display of R, G, and B is performed by one reflective display device. In the figure, portions denoted by the same reference numerals as those in the first embodiment have the same configuration and the same processing operations as those in the first embodiment. 101 is a color disk unit including a rotary disk and a color disk composed of three color filters for extracting three colors, R, G, and B, respectively, of the wavelength component of the lamp 7, and 102 is the color component. Sensors for detecting the rotational position of the disk, 103 and 104 are lenses for condensing the light flux from the light source in a point on a color filter, and 10 :! An optical unit is formed by .about.104. Reference numeral 100 denotes a color filter control circuit of the color disk unit 101.

The second embodiment will be described with reference to FIGS.

First, the control of the color disk unit 101 will be described. The basic processing technology is the same as that of the conventional example (the technology described in Japanese Patent Application Laid-Open No. H10-48542). The rotation motor of the color disc unit 101 is controlled so that the light beam spot passes through each of the R, G, and B color filters at least once in one frame period (Vsync). Color circle by sensor 102 It outputs a position detection signal 102a indicating that a specific position on the board has passed. Ri by the tie Mi ring generator circuit 4 and the color filter control circuit 1 0 0, the position phase and period of the detection signal 1 0 2 a is urchin feedback control by outlined matching V sync _(:

In the second embodiment, the color disk unit 101 is synchronized with the position detection signal 102a by synchronizing the runf synchronization signal -5a and the sequence start timing of the time distribution control with the position detection signal 102a. This control performs the lamp drive switching control and the time distribution control in synchronization with the specific color filter position.This configuration also reduces the effect of uneven rotation of the color disk unit.

According to the second embodiment, as shown in the waveform diagram of FIG. 5, the timing condition for the optical beam bot to pass through each color filter is set as the ringing waveform of the ringing drive direction switching. The timing to be generated may be set according to the luminance level (light intensity) of the light passing through each color filter. For example, avoiding the G filter, which has a higher luminance level than other R and B, and matching the generation timing of the ringing waveform to the B filter or the R filter, the gradation expression accuracy by the ringing waveform can be improved. Try to prevent deterioration.

Furthermore, during the period when the beam bot passes the color boundary of the color filter, a reflection control off period is provided to stop the reflection control of the reflective display device, so that the color mixing occurs immediately after switching the lamp drive. By matching the ringing periods of the luminance level, it is possible to suppress the adverse effect of the time distribution control on the gradation expression accuracy. If the ringing period of the luminance level generated immediately after the switching of the lamp drive does not fall within the reflection control off period, the adaptive time distribution control method similar to that shown in the first embodiment is applied. Applying to time distribution control for each primary color component enables highly accurate gradation expression. In the second embodiment, a color disk composed of three color filters is used. 2 ΰ

The color filters that pass through the beam spot are switched by mechanical rotation, but if the color components are expressed in a time-division manner, the filter shape, filter characteristics, and number of colors Etc. may be different from the second embodiment.

(Third embodiment)

As a third embodiment of the present invention, a configuration (not shown) in which a series of processes for generating a pseudo waveform in the first and second embodiments is conceivable ::: In the example, when the ringing component of the lamp luminance level immediately after the lamp drive switching is known, time distribution information corresponding to the adaptive time distribution shown in the above-described second embodiment is prepared in advance. In other words, a configuration is provided in which a plurality of time allocation information is provided in advance, and the influence of the ringing component of the lamp luminance level is suppressed by selecting the optimum time allocation information for the lamp driving condition.

According to the _third embodiment, the processing circuit can be simplified and the circuit cost can be reduced, and the deterioration in the accuracy of the gradation expression caused by the ringing component of the luminance level can be reduced. Can be significantly reduced.

(Fourth embodiment)

FIG. 6 shows a fourth embodiment of the present invention, which is a block diagram of the configuration of an image display section which uses a reflective or transmissive liquid crystal panel and expresses gradations in analog display levels in image display cycle units. FIG. FIG. 7 is a waveform diagram for assisting the configuration shown in FIG. Although not shown in FIG. 6, this embodiment also has a micro computer for system main control (hereinafter, external CΡU), and is set as // COM in the figure as a set value. In the drawing, the same reference numerals are given to portions having basically the same configuration as those of the first, second, and third embodiments, and description thereof will be omitted.

As a liquid crystal panel, TN (Twisted Various types of liquid crystal have been proposed, such as liquid crystal and ferroelectric type liquid crystal which can express time distribution gradation with high-speed response.

In FIG. 6, reference numeral 300 denotes a light emission amount integrating circuit, reference numeral 310 denotes a total light amount determination circuit, reference numeral 302 denotes a comparator, reference numeral 303 denotes an amplifier circuit AMP, reference numeral 304 denotes an image forming device control circuit, and reference numeral 30 denotes an image forming device control circuit. 5 is an image forming device.

The operation will be described below with reference to Fig. 7-In the light emission amount integration circuit 300, the light amount detection circuit 8, which is a high-sensitivity photosensor, and the digital data obtained by the AMP 18 and the ADC 19 are displayed. The light intensity information 19 a of the light source to be obtained and a timing signal disp indicating the start of one-frame image display are obtained from the timing generation circuit 4. In this case, the sampling frequency and quantization accuracy of the digital data are set to the frequency (preferably several hundred kHz or more) and the number of bits (more than the number of image display gradations) enough to capture the change in light intensity. is necessary. Using the timing signal disp as the zero point, the integrated result の of the light emission amount 19 a is output as needed. In this case, as shown in Fig. 7, focusing on the same image display cycle (sf0, sf1, sf2, ...), the ringing waveform portion of the light source and the flutter force (fluctuation) ), The integration transition is not uniform, and the total light amount (∑ 0, ∑ 1, 1) for each image display cycle may be different for each cycle. The total light amount determination unit 301 determines the total light amount th used in one image frame display period according to the integration result に従い according to the history of the total light emission amount for each display cycle and the set value μ COM from the system control unit. Determine. Adjust the color reproducibility by providing an image display device for each color component, or if the color components are to be reproduced in a time-division manner, determine the total light quantity th for each of the R, G, and B primary colors. You can do it. At the same time, the total light quantity determining unit 301 also determines the amplitude expansion coefficient of the input image information. This coefficient depends on the excess or deficiency of the total light emission of the light source. If the amount is insufficient, the input image signal level is increased (amplitude extension), and if excessive, the input image signal level is decreased (oscillation). In the amplifier circuit AMP 3 0 3 for narrowing) good controlled so, the amplitude expansion coefficient alpha 'in accordance with the input image signal ₌ comparator 3 0 amplifies and outputs the 2, arrival information to use the total amount th of integration result sigma SW The timing of the arrival information SW, which indicates the timing of the arrival information SW, controls the on / off of the reflection or transmission of the luminous flux of the image forming device 305 by the image forming device control circuit 304. . In this case, the image forming device 305 is turned on in the non-arrival period by the arrival information SW, and an image is projected on the screen 24;

As described above, the total light amount used for image reproduction in the image forming device becomes substantially constant by making the used total light amount th for each successive image display frame period the same value by the configuration and operation described above. As a result, even if the ringing of the lamp light source 7, a certain level, or a frit component is generated, the screen 24 can reproduce an image with a stable light quantity, and the circuit processing delay is reduced. On the other hand, even if the timing of turning off the image forming device 105 is delayed by the circuit processing delay, the total light emission amount determining circuit 301 determines whether the total light emission amount of the past image display frame period has expired. The total light emission amount is stored as history information, the arrival time to th is calculated in advance from this history information, and the value of th is reduced by the circuit processing delay to shorten the issuance time of the s W signal. . This makes it possible to further stabilize the amount of light used between display frames even if the amount of light emitted from the light source fluctuates. When the light emission characteristics of the light source change over time, the light source is controlled so as to follow the light amount by updating the total light amount t h used. In this case, the update timing of th is set at the time of switching the screen (scene) of the input image signal or at the time of starting up the apparatus, and the force or the amount of fluctuation that minimizes the update on the continuous screen (scene). The continuity of the luminance level of the reproduced image quality is maintained by smoothly changing.

Although shown for the case of on-off by the image forming Debaisu, In addition, if the configuration capable of controlling the light of their time be other techniques yo Rere _π Also, by inputting, for example, the pseudo waveform signal 16a in the first embodiment configuration instead of 19a as the input value to 300, the same effect as in the first embodiment can be obtained. Is obtained.

In the fourth embodiment, the case where the one-image display frame RGB is individually driven has been described. In addition, as in the third embodiment, the one-image display frame is time-divided and R , G, it may also display the B alternately les, ₌ in this case, the total amount the same effect by controlling determined respectively by the total light quantity determining unit 3 0 1 used for each color component is obtained: In addition, even when the gradation is the same, when the total light amount is small, it is possible to keep the apparent light amount substantially constant by increasing the amplitude of the input image ί symbol by using AMP303. . On the other hand, if there is excess light in the total light amount, the visibility can be improved by reducing the amplitude, extending the light use time, and shortening the light non-use time. The configuration using either of them controls such that the amount of light expressing the same gradation is substantially constant, and the same effect can be obtained. Also, the AC drive type lamp that is driven in synchronization with the display frame has been described as the lamp drive timing. In addition, an AC drive type lamp that is driven asynchronously may be used. Further, a DC-driven lamp may be used. In the case of the DC drive type, switching of the driving direction is not required, so that the generation of a ringing waveform is suppressed at least to that extent. Further, in the fourth embodiment, the comparison result of the total light emission amount is used for the comparison of the total light emission amount in the comparator 302. However, the present invention is not limited to this. For example, a configuration using the integration result of the difference value with respect to the ideal light emission level) may be used. In this case, the arithmetic circuit can be simplified and the arithmetic processing can be reduced.

In each of the first, second and third embodiments, the case where the change in the luminance level of the lamp is fed back and applied after the next switching of the lamp driving current direction has been described. However, the present invention is not limited to this. In fact, the high-speed extraction of the ringing component by improving the processing speed of the processing circuit and processing software makes it possible to realize gradation expression by time distribution control within the same lamp driving current direction cycle. Good. The image forming device may be other than that shown in each embodiment.

Further, in the first, second, third and fourth embodiments, a case has been described in which a photosensor based on photoelectric conversion is used as the light amount detecting means 8, but the present invention is not limited to this. Detection technology. For example, by utilizing the fact that the lamp drive current and the lamp output match, the current value may be monitored and fed back to the gradation modulation control circuit: However, in this case, deterioration due to aging may occur. Since the light emission characteristics of the lamp deteriorate, it is necessary to compensate for the deterioration. Also, the ringing component of the lamp may be monitored by detecting the temperature change of the luminous flux from the lamp. Further, the light amount detection circuit 8 may be configured to have an integration function based on an analog value, thereby simplifying the configuration of an integrator configured by a digital arithmetic circuit and shortening the signal processing time. .

In addition, the present invention is configured to reproduce an image by controlling expansion and contraction of a light use time (period) basically in response to a change in light intensity of a light source. The light use time (period) is changed by changing a pulse width. It may be a method that changes the power, that is, a so-called PWM (Pulse Width Modulation) method.

Further, in this embodiment, the processing method is described using a hardware configuration. However, the processing method is not limited to this, and a configuration realized by software such as a DSP (Digital Signal Processor) or a microcomputer may be used. Industrial applicability

As described above, the image display technology according to the present invention employs a front type perimeter. It is useful as a projector-type projection display device, a television, etc., and is particularly suitable for reducing the flicking phenomenon and improving the image quality by making the amount of change in the luminance level of the displayed image substantially constant. I have.

Claims

Range of request

1. An image display method in which light corresponding to an image signal is projected from a display device to a display unit to display an image.

Detecting light intensity information from the light source side and forming a control signal based on the information;

Driving the display device based on the control signal.

An image display method, wherein an image display is performed by controlling a reflection time or a transmission time of light in the display device based on intensity information of light from the light source side.

2. An image display method for projecting light corresponding to an image signal from a display device to a display unit to display an image,

Integrating a light amount within a predetermined display period based on the control signal and outputting integrated light amount information;

Driving the display device based on the integrated light amount information,

An image display method, wherein an image display is performed by controlling a reflection time or a transmission time of light in the display device based on the integrated light amount information obtained from the light intensity information.

3. An image display method for projecting light corresponding to an image signal from a display device to a display unit to display an image,

Detecting light intensity information from the light source side and forming a control signal based on the information; Integrating a light amount within a predetermined display period based on the control signal and outputting integrated light amount information;

Driving the display device based on the integrated light amount information; determining a light amount necessary for image display;

Comparing the information on the amount of light necessary for displaying the image with the above-mentioned integrated light amount information;

With

An image display is performed by controlling the reflection time or transmission time of light in the display device based on the accumulated light amount information. When the accumulated light amount reaches the required light amount, the light is projected on the display unit. An image display method characterized by being stopped.

4. An image display method for projecting light corresponding to an image signal from a display device to a display unit to display an image,

A step of integrating the light amount within a predetermined display period based on the control signal and outputting integrated light amount information;

Driving the display device based on the integrated light amount information; controlling a signal level of an input image signal;

With

An image display is performed on the display unit by controlling a reflection time or a transmission time of light in the display device based on the integrated light amount information, and controlling an input image signal level based on the integrated light amount information. An image display method characterized by the following.

5. An image display method in which light corresponding to an image signal is projected from a display device to a display unit to display an image. Detecting light intensity information from the light source side and forming a control signal based on the information;

Generating pseudo waveform information based on the control signal;

Comparing the intensity information of the light from the light source side based on the control signal and the pseudo waveform information to extract waveform difference information;

Determining a waveform generation condition of the pseudo waveform generation unit according to the waveform difference information;

Determining in advance the distribution of the amount of reflection or transmission of light on the display device based on the pseudo waveform information;

With

The waveform generation condition is determined in a direction to reduce the difference value of the waveform difference information, and the distribution condition of the amount of reflection or transmission of light of the display device is determined in advance based on the pseudo waveform information corresponding to the determined waveform generation condition. An image display method, characterized in that the display device is driven according to the determined distribution condition to display an image.

6. An image display method for projecting light corresponding to an image signal from a display device to a display unit to display an image,

Generating pseudo-waveform information based on the control signal; comparing intensity information of light from the light source based on the control signal with the pseudo-waveform information to extract waveform difference information;

Determining in advance the distribution of the amount of reflection or transmission of light on the display device based on the pseudo waveform information; Integrating the difference between the reference light intensity information and the pseudo-waveform information to obtain an excess or deficiency of the pseudo-waveform information with respect to the reference light intensity information,

The waveform generation condition is determined in a direction to reduce the difference value of the waveform difference information, and the amount of reflected light or the amount of light transmitted through the display device in advance according to the pseudo waveform information corresponding to the determined waveform generation condition and the excess / deficiency amount An image display method, wherein the display device is driven according to the determined distribution condition to display an image.

7. An image display device for projecting light corresponding to an image signal from a display device to a display unit to display an image,

A display device for controlling the amount of reflection or transmission of light emitted from the light source,

A drive circuit for driving the display device,

With

An image display is performed by controlling the amount of reflection or transmission by controlling the reflection time or transmission time of light in the display device by the drive circuit based on the control signal of the detection system. Image display device.

8. An image display device for projecting light corresponding to an image signal from a display device to a display unit to display an image,

An illumination optical system that emits light from the light source side,

A display device which is irradiated with light from the illumination optical system and controls a reflection amount or a transmission amount of the irradiated light;

A driving circuit for driving the display device; A detection system that detects information on the intensity of light from the light source side and outputs information on the integrated light amount from the start of image display within a predetermined display period based on the information.

The drive circuit is driven based on the output signal of the detection system, and the amount of reflection or transmission is controlled by controlling the reflection time or transmission time of light in the display device, so that an image is displayed on the display unit. An image display device comprising:

9. An image display device for projecting light corresponding to an image signal from a display device to a display unit to display an image,

An illumination optical system that emits light from the light source side,

A driving circuit for driving the display device;

An integrating unit that integrates a light amount within a predetermined display period based on the control signal of the detection system;

With

The output signal of the integration unit is input to the drive circuit to control the reflection time or transmission time of light in the display device, thereby controlling the amount of reflection or transmission and displaying an image on the display unit. An image display device comprising:

10. An image display device for projecting light corresponding to an image signal from a display device to a display unit to display an image,

An illumination optical system that emits light from the light source side,

Light from the illumination optical system is irradiated, and the amount of reflection or transmission of the irradiated light A display device to control the amount;

A drive circuit for controlling and driving the display device;

A detection system that detects the light intensity information from the light source side and outputs information on the integrated light amount from the start of image display within a predetermined display period based on the information, and a light amount determination that determines the light amount necessary for image display Department and

A comparing unit that compares information on the amount of light necessary for displaying the image with the information on the integrated amount of light,

With

The drive circuit is driven based on the information on the integrated light amount of the detection system, and the reflection time or the transmission time of the light in the display device is controlled to control the reflection amount or the transmission amount, thereby displaying an image on the display unit. And when the integrated light amount reaches the required light amount, projection of light from the display device to the display unit is stopped based on the output signal of the comparison unit. Image display device.

1 1. An image display device for projecting light corresponding to an image signal from a display device to a display unit to display an image,

An illumination optical system that emits light from the light source side,

A drive circuit for controlling and driving the display device;

An integrating unit that integrates the light amount within a predetermined display period based on the control signal of the detection system and outputs information of the integrated light amount;

A light amount determining unit for determining a light amount required for image display,

A ratio for comparing the information on the amount of light required for displaying the image with the information on the integrated amount of light. With comparison department,

With

The driving circuit is driven based on the information on the integrated light amount of the integrating unit, and the reflection time or the transmission time of the light in the display device is controlled to control the reflection amount or the transmission amount, thereby displaying an image on the display unit. When the integrated light amount reaches the required light amount, the projection of the light from the display device to the display unit is stopped based on the output signal of the comparison unit. Image display device.

1 2. An image display device that displays an image by projecting light corresponding to an image signal from a display device to a display unit,

An illumination optical system that emits light from the light source side,

A drive circuit for controlling and driving the display device;

An amplitude control unit that controls the signal level of the input image signal;

With

The drive circuit controls the reflection time or transmission time of the light in the display device based on the output signal of the integration unit, thereby controlling the amount of reflection or transmission, and based on the output signal of the integration unit. An image display device characterized in that an input image signal level is controlled by an amplitude control unit and an image is displayed on the display unit.

1 3. Project the light corresponding to the image signal from the display device onto the display An image display device for displaying,

An illumination optical system that emits light from the light source side,

A display device that is irradiated with light from the illumination optical system and controls a reflection amount or a transmission amount of the irradiated light;

A drive circuit for controlling and driving the display device;

With

The drive circuit controls the reflection time or transmission time of the light in the display device based on the output signal of the detection system to control the amount of reflection or transmission, and based on the output signal of the detection system, The amplitude control unit controls the input image signal level to display an image. When the integrated light amount reaches the required light amount, the display unit from the display device based on the output signal of the comparison unit An image display device characterized in that it is configured to stop projecting light onto the device.

14. An image display device that displays an image by projecting light corresponding to an image signal from a display device to a display unit,

An illumination optical system that emits light from the light source side,

A drive circuit for controlling and driving the display device;

A detection system for detecting intensity information of light from the light source side and forming a control signal When,

A pseudo waveform generator that generates pseudo waveform information based on the control signal of the detection system;

A comparing unit that compares intensity information of light from the light source side based on the control signal of the detection system with the pseudo waveform information of the pseudo waveform generating unit and extracts waveform difference information;

A first determination unit that determines a waveform generation condition of the pseudo waveform generation unit according to the waveform difference information extracted by the comparison unit;

A second determining unit that predetermines the distribution of the amount of reflection or transmission of light on the display device based on the pseudo waveform information;

With

The waveform generation condition is determined in a direction to reduce the difference value of the waveform difference information by controlling the first determination unit, and the second determination unit is controlled based on the pseudo waveform information corresponding to the determined waveform generation condition. An image display device, wherein a distribution condition of a reflection amount or a transmission amount of light of the display device is determined in advance, and the display circuit is driven by the drive circuit based on the distribution condition to display an image. .

15. An image display device that displays an image by projecting light corresponding to an image signal from a display device to a display unit,

An illumination optical system that emits light from the light source side,

A drive circuit for controlling and driving the display device;

A pseudo waveform generator for generating pseudo waveform information based on the control signal of the detection system. Narbe and

A comparing unit that compares intensity information of light from the light source based on the control signal of the detection system with the pseudo waveform information of the pseudo waveform generation unit and extracts waveform difference information;

A second determination unit that determines in advance the distribution of the amount of reflection or transmission of light in the display device based on the pseudo waveform information;

An integration unit that integrates the difference between the reference light intensity information and the pseudo-waveform information to obtain an excess / deficiency amount of the pseudo-waveform information with respect to the reference light intensity information,

The first determination unit is controlled to determine the waveform generation condition in a direction to reduce the difference value of the waveform difference information. The second determining unit is controlled based on the corresponding signal to determine in advance the distribution condition of the amount of reflection or transmission of light in the display device. An image display device that performs display.

16. The gradation expression of each color component in the above display device is represented by N bits, a predetermined image display period is divided into N times, and time distribution is determined for each bit unit. Claim 13 or Claim 14 wherein the time region of the corresponding bit is blinked in accordance with the gradation information, so that the gradation is expressed as light emission within a predetermined display period. An image display device according to the item.

17. The image display device according to claim 16, wherein the second determination unit is configured to determine a time distribution in units of bits in accordance with the excess / deficiency amount in the integration unit.

18. The image display device according to any one of claims 7 to 17, wherein the display device is configured to switch a light reflection direction according to a tilt of the minute mirror.

19. The image display device according to any one of claims 7 to 17, wherein the display device is a liquid crystal panel.

20. The image display device according to any one of claims 7 to 19, wherein the display device is provided for each primary color component.

21. A color filter unit that extracts primary color components of light from the light source side, and a color filter driving unit that switches the color filter unit in a time-division manner within a predetermined image display period,

10. The image display device according to any one of claims 7 to 19, wherein the primary color component of the light is extracted in a time-division manner and is applied to the display device.

2 2. The light source includes an AC drive type lamp, a lamp drive timing generator that generates a drive switching timing signal of the AC drive lamp in synchronization with a predetermined image display period, and a lamp drive timing. The image display device according to any one of claims 7 to 21, comprising a lamp driving unit that drives a lamp according to a signal.

23. The image display device according to any one of claims 7 to 20, wherein the light source is configured to use a DC-driven lamp having a fixed driving direction.

24. The image display device according to claim 22, wherein the color filter switching timing by the color filter driving unit and the switching timing of the driving direction of the AC driving lamp coincide with each other.

25. In the above color filter switching timing, when the intensity level of the light passing through the color filter selected next in time series is lower than that of the other color filters, the lamp driving unit controls the lamp. Drive direction is switched The image display device according to claim 22 or claim 24, wherein

26. The image display device according to any one of claims 7 to 25, wherein the detection system is configured to detect light intensity with a photo sensor.

27. The image display device according to any one of claims 7 to 2, wherein the detection system is configured to obtain light intensity information from a lamp drive current.

2 8. The detection system, image display device according to any one of Claim 7 from heat of the lamp light beam is configured to determine the intensity information of the light of the second Section 5 ₍

29. The image display device according to any one of claims 7 to 28, wherein the detection system has a configuration for converting detected light intensity information into digital data.

30. A control circuit used in the image display device according to any one of claims 1 to 29, wherein the control circuit includes at least a part of the detection system. circuit.