JP2003084735A - Method and apparatus for displaying color image - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display method for a color image displaying apparatus which is capable of eliminating the discontinuity of the display luminance variation with respect to gradation variation. SOLUTION: A prescribed value of the incident light quantity and the timing assuming this prescribed value are previously determined by utilizing an image display panel consisting of a multiplicity of pixels capable of modulating the incident light according to respective color signals, an optical system of making the light of the respective colors incident on the image display panel and continuously moving the light of the respective colors on the image display panel and a circuit for driving the image display panel of subjecting the pixels in the arbitrary segment of the image display panel to PWM driving in correspondence to the colors of the incident light on this segment and further, the timing of the respective display gradation bits of the PWM driving is previously so set that the display luminance of the respective display gradation bits (n) of the PWM driving attains the product of the above prescribed value and 2<n> and the image display is performed by utilizing the set timing.

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 or a projection type image display device for performing color display with one light valve as a modulation means.

[0002]

2. Description of the Related Art Conventionally, there has been a PWM driving method as a method for displaying a full-color image, and recently, it has been widely used for a dot matrix type display such as a plasma display.

The PWM drive display is as shown in FIG.
This is a method of forming a grayscale display by amplitude-time axis conversion processing in which the display of the display element is turned on for a period proportional to the amplitude of the RGB video signal. FIG. 12 shows the most basic PWM pattern when the gradation of the RGB video signal is 8 bits.
This turns on / off the display for a time proportional to each gradation bit of RGB. However, this method has a problem that flicker and pseudo contours occur during moving images because the display-on portion tends to concentrate in a part of the period. Figure 1
FIG. 1 is commonly used to solve the second problem.
3 is a PWM pattern. In FIG. 13, each gradation bit is divided into fine segments to prevent a specific one gradation from being concentrated in a part of the period, and the problem of FIG. 12 is solved. However, FIG. 12 and FIG. 13 have separate common problems. Since both of them drive the PWM pattern of RGB in a time-division manner, there is a problem that color separation occurs when displaying a moving image. To solve this problem, the PWM of FIG.
The pattern is used. The PWM pattern in FIG. 14 is RG.
The PWM pattern of each color B is divided into several pieces, and the divided patterns are rearranged as RGBRGB--. By increasing the number of divisions and exceeding the detection range by the human eye, color separation is eliminated.

The image display panel has an optical system in which each color light of red, green, and blue is incident on the image display panel and continuously moves each color light on the image display panel, and the image display panel is PWM according to the timing of light passage. In a light valve type display that displays a full-color image by driving, even if the light source light is condensed into a rectangular light having a uniform light amount distribution by using a so-called integrator, a lens system of a color separation optical system and a scanning optical system When passing through, a luminance difference occurs between the central portion and the peripheral portion of the optical axis due to the cosine power law. Therefore, the brightness of the scanning light passing through the image display panel is not constant in time and space. The spatial brightness difference appears as a brightness difference at each position on the screen, but a method of solving it by brightness modulation of the video signal is general and does not cause a problem.

[0005]

However, the temporal luminance difference is the luminance difference between the gradations, that is, the display light amount with respect to the gradation change, since the PWM drive which is the processing in the time direction is performed on the image display panel. A discontinuity of change occurs.

Further, since the light valve type display uses the PWM driving type, gradation representation is limited by the number of quantization bits of the image. Therefore, when the number of gradations is insufficient, the image has pseudo contours lacking smoothness.

In the light valve type display, since the brightness of the boundary between the scanning lights of the respective colors for scanning the image display panel is lowered, the amount of light that can be used is reduced and the display luminance is decreased when the overlapping of the colors is avoided. To do.

The present invention takes into consideration such problems of the conventional light valve type display, and 1) it is possible to eliminate discontinuity of the change in display luminance with respect to the change in gradation, or 2) the number of quantization bits of video. The lack of smoothness of the image at the time of lack, or the occurrence of false contour can be eliminated, or
3) It is an object of the present invention to provide a color image display method and device capable of achieving both improvement of display brightness and expansion of the number of video quantization bits.

[0009]

In order to solve the above problems, the present invention uses the following methods and means.

Regarding the discontinuity in the change in the display light amount with respect to the change in gradation, the incident light amount can be changed even when the light amount of the irradiation light of each color which is incident on the image display panel and is moved varies with time. The predetermined value and the timing with which the predetermined value is taken are obtained, and the timing of each PWM drive display gradation bit is set so that the display brightness of each PWM drive display gradation bit n becomes the product of the predetermined value and 2 ^n. , A color image is displayed by eliminating the brightness discontinuity between display gradations.

Next, with respect to the problem of insufficient number of display gradations, the PWM is applied when the light amount of each color light incident on the image display panel and moved varies with time, or even when there is no change.
A method and means for adding a PWM pattern to a timing having a light amount which is half the least significant expression bit of driving is used.

Regarding the decrease in display brightness, a period in which two adjacent colors of incident light on the image display panel are overlapped is provided.
The process of driving the luminance signal component is also performed in the period in which the colors overlap.

The present invention is not limited to the above means,
It has the following configuration.

The first invention (corresponding to claim 1) is
An image display panel consisting of a large number of pixels capable of modulating incident light in accordance with each color signal of red, green and blue, and each color light of red, green and blue is made incident on the image display panel to continuously image each color light. An image display panel drive in which an optical system for moving on a display panel and PWM driving of pixels of the portion corresponding to the color of light incident on the image display panel with a signal matching the color of the incident light And a circuit for displaying a predetermined value of the incident light amount and a temporal timing for obtaining the predetermined value.
The display brightness of each drive display gradation bit n is equal to the predetermined value and 2
^This is a display method of a color image display device in which the timing of each display grayscale bit for PWM driving is set so as to be a product of ⁿ , and an image is displayed by using the set timing.

The second invention (corresponding to claim 2) is
The predetermined value of the incident light amount is the average value of the brightness of the scanning light ×
It is the color image display method of the first invention of the unit time.

The third invention (corresponding to claim 3) is
An image display panel consisting of a large number of pixels capable of modulating incident light in accordance with each color signal of red, green and blue, and each color light of red, green and blue is made incident on the image display panel to continuously image each color light. An image display panel drive in which an optical system for moving on a display panel and PWM driving of pixels of the portion corresponding to the color of light incident on the image display panel with a signal matching the color of the incident light A color image display device including a circuit, wherein a predetermined value of an incident light amount and a temporal timing for obtaining the predetermined value are obtained in advance, and the display brightness of each PWM drive display gradation bit n is This is a color image display device in which the timing of each PWM drive display gradation bit is set so as to be a product of a predetermined value and 2 ⁿ , and an image is displayed using the set timing.

The fourth invention (corresponding to claim 4) is
An image display panel consisting of a large number of pixels capable of modulating incident light in accordance with each color signal of red, green and blue, and each color light of red, green and blue is made incident on the image display panel to continuously image each color light. An image display panel drive in which an optical system for moving on a display panel and PWM driving of pixels of the portion corresponding to the color of light incident on the image display panel with a signal matching the color of the incident light A method of displaying a color image display device including a circuit, wherein a PWM pattern is added to a timing having a light amount of half of the least significant expression bit of PWM driving,
This is a color image display method for increasing the number of display gradation bits.

A fifth aspect of the present invention (corresponding to claim 5) is as follows.
An image display panel consisting of a large number of pixels capable of modulating incident light in accordance with each color signal of red, green and blue, and each color light of red, green and blue is made incident on the image display panel to continuously image each color light. An image display panel drive in which an optical system for moving on a display panel and PWM driving of pixels of the portion corresponding to the color of light incident on the image display panel with a signal matching the color of the incident light A color image display device including a circuit, wherein a PWM pattern is added to a timing having a light amount which is half of the least significant expression bit of PWM driving to increase the number of display gradation bits.

The sixth invention (corresponding to claim 6) is
An image display panel consisting of a large number of pixels capable of modulating incident light in accordance with each color signal of red, green and blue, and each color light of red, green and blue is made incident on the image display panel to continuously image each color light. An image display panel drive in which an optical system for moving on a display panel and PWM driving of pixels of the portion corresponding to the color of light incident on the image display panel with a signal matching the color of the incident light A method for displaying a color image display device including a circuit, wherein the optical system provides an overlapping period of two adjacent colors for light incident on the image display panel,
The image display panel drive circuit drives the luminance signal component in the overlapping period of the two colors, and adds a PWM pattern to the timing having a light amount which is half of the least significant expression bit of the PWM drive, thereby increasing the number of display gradation bits. It is a display method of a color image display device.

The seventh invention (corresponding to claim 7) is
An image display panel consisting of a large number of pixels capable of modulating incident light in accordance with each color signal of red, green and blue, and each color light of red, green and blue is made incident on the image display panel to continuously image each color light. An image display panel drive in which an optical system for moving on a display panel and PWM driving of pixels of the portion corresponding to the color of light incident on the image display panel with a signal matching the color of the incident light A color image display device including a circuit, wherein the optical system provides an overlapping period of two colors adjacent to each other for incident light to the image display panel, and the image display panel drive circuit overlaps two colors. It is a color image display device that drives a luminance signal component during a period and adds a PWM pattern to a timing having a light amount that is half of the least significant expression bit of PWM driving to increase the number of display gradation bits.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION (Embodiment 1) Embodiment 1
Solves the problem that the change in the display light amount with respect to the change in gradation becomes discontinuous. FIGS. 1 and 2 are configuration diagrams of the first embodiment. FIG. 1 shows the overall configuration, and FIG. The signal processing contents are shown. FIG. 1 shows a light source section 12 and a light collecting means 1.
1, a color separation optical system 10, an optical system including a scanning unit 8 and a scanning optical system 9 of a scanning lens 7, a transmissive image display panel 6, and a PWM drive processing circuit 1 for driving the same.
It is composed of

First, the basic operation will be described. The light emitted from the light source unit 12 is condensed by the condensing unit 11, and the light having the same shape as that of the illumination light to the image display panel 6 in the subsequent stage is output. The light collecting means 11 is generally called an integrator, and a concrete example thereof is shown in FIG. FIG. 15 shows a multi-lens array having two stages with the same number of lenses. First stage array 41
The light incident on each of the lenses is focused on the corresponding lens of the second-stage array 42, and is uniformly irradiated to the image-forming surface 43 of the latter-stage array, so that the light intensity at each position in the latter-stage image-forming unit is made uniform. There is a function to do so.

The output light of the condenser means 11 is then separated by the color separation optical system 10 into rectangular light of each color of RGB. Color separation is generally performed using a color filter. The output light of the color separation optical system 10 is then input to the scanning means 8,
The RGB rectangular light is scanned and output.

The scanning means 8 can be realized by, for example, a method using a polygon mirror shown in FIG. The scanning output light is incident on the scanning lens 7. The scanning lens 7 is composed of a so-called fθ lens having a property of forming an image at a position proportional to the incident angle. As a result, rectangular color scanning lights as shown in FIG. 3 are incident on the image display panel 6.

On the other hand, to the image display panel 6, a PWM pattern created by conversion from RGB signals is input in synchronization with the rectangular color scanning lights. As a result, an image is formed by the transmitted light of the image display panel 6.

A rectangular light having a uniform light intensity is output from the light converging means 11, but various lenses are present in the optical system in the subsequent stage, so that the image input panel 6 at the input stage is shown in FIG. As shown in, the unevenness of the brightness of each RGB light in the scanning direction 1
9, 20, 21, and unevenness in brightness 22 in the direction vertical to the optical scanning
Occurs.

The brightness unevenness 22 appears as brightness shading in the horizontal direction on the screen. Scanning light 19 of each RGB color,
The effect that 20 and 21 have uneven brightness is shown in FIG. Figure 4
14 is the same as the PWM drive pattern shown in FIG. 14 of the conventional example. When there is no brightness unevenness (23), the brightness of each gradation bit of PWM is uniform, but when there is brightness unevenness (24), the brightness of each gradation bit is unbalanced.

For example, in contrast to the gradation bit 6 driven at the timing when the scanning light intensity is maximum, the light amount of the gradation bit 7 driven in the portion where the scanning light intensity is low is relatively reduced.
As a result, as shown in FIG. 5, the discontinuity of the display light amount in the portion where the gradation is increased to 7, that is, the discontinuity of the gradation linearity 2
5 occurs.

First, the PWM drive processing method for eliminating the discontinuity of the gradation linearity will be described with reference to FIGS.
This will be described with reference to FIGS. 7 and 8. The PWM drive pattern will be described by taking as an example the case of changing the PWM drive pattern based on that of FIG.

First, FIG. 6 shows the definition of parameters relating to the processing. FIG. 6A shows the relationship between the brightness of scanning light and time. Since the light amount of the end portion of the scanning light is small, it is not used and the range of time t0 to t1 is used for driving as shown in FIG. 6 (b). In addition, the brightness of the scanning light at time t is represented by a function f (t). Next, assuming that the amount of light that can be used is S, S is represented by the area of FIG. 6C (Formula 1). The average value Sav of brightness is represented by (Equation 2).

[0031]

[Equation 1]

[0032]

[Equation 2] Further, the timing at which the brightness of the scanning light becomes equal to the brightness average value Sav, that is, the solution of (Equation 3) is defined as t2 and t3.

[0033]

[Equation 3] Next, a method of arranging the PWM patterns will be described with reference to FIGS. 4 and 5. An example in which the method of FIG. 14 is improved will be described.

The minimum unit of the light quantity in the PWM pattern is represented by the average value Sav × the unit time of the brightness of the scanning light, and the unit light quantity is the following bit φ, the light quantity corresponding to the predetermined value.

Bit0 (least significant bit) is 2 in FIG.
6 and bit1 are 27 timings in FIG. 7, and are arranged in the vicinity of timings t2 and t3 at which the average value of the brightness of the scanning light is obtained. Of course, the period width of bit 1 is 2 of bit 0
Double.

For bit2, the bit plane 28,
They are arranged so that the difference between the sum of 29 and the value of 4 times the light amount of bitφ is minimized. The bit plane arrangement is determined by the same method for gradations of bit 3 and above.

That is, when displaying the gradation n, the brightness determined by the arrangement of the bit planes and the light amount of bitφ × (n of 2)
Squared), and decide to minimize the difference between.

By the above method, the PWM pattern array becomes as shown by 15 in FIG. As described above, 14 in FIG. 2 is the PWM pattern array of FIG. 4, that is, 14 of FIG. By the above method, the difference in the display light amount between the gradations is eliminated, and the gradation linearity is kept good.

Next, a specific example of circuit processing for embodying the above processing method will be described with reference to FIGS. 1, 2, 17, and 18.

In FIG. 1, the PWM drive processing circuit 1 comprises a buffer memory 2, a PWM output circuit 3, and a PWM output control circuit 4. Video signal P in real time
In order to convert to a WM pattern, it is necessary to store a video signal in a buffer memory of at least one frame, sequentially read video signal data from the memory, convert to a PWM pattern, and drive the image display panel 6. is there.

FIG. 17 shows an example of a specific circuit configuration of the buffer memory 2 and the PWM output circuit 3, and FIG. 18 shows a specific example of an image display panel configuration corresponding to the circuit configuration of FIG. In FIG. 17, the RGB video signal data is temporarily stored in the memory area of the first stage represented by the area from the memory area 1 to the memory area m. Each memory area corresponds to the display width 38 shown in FIG. 18 on the image display panel.

Then, the data is read from the first-stage memory area and stored in the second-stage memory area. The memory area in the second row stores the video signal data of the portion of X × Y dots shown by 37 in FIG. 18, and the video signal data of the entire screen is stored in m × n memories. Such a memory configuration is for slowing down the driving process, and is a method that is already widely used in general.

The read data of the second-stage memory is selected by the data selector 39 as 1 bit, and further by the data selector 40 as data of one color from RGB, which is input to the corresponding area of the image display panel 6. By sending the read data of the second-stage memory to the pixels of X × Y dots of the image display panel in time series at a gradation bit and timing matched with the PWM drive pattern (15 in FIG. 2), A predetermined PWM drive is realized.

(Second Embodiment) The second embodiment is to solve the problem of insufficient display gradation number. 9 and 10 are configuration diagrams of the second embodiment. FIG. 9 shows the overall configuration, and FIG. 10 shows signal processing contents.

FIG. 9 shows an optical system including a light source section 12, a condenser means 11, a color separation optical system 10, a scanning means 8 and a scanning optical system 9 of a scanning lens 7, and a transmission type image display panel 6. , And a PWM drive processing circuit 1 for driving the same, and P
It is configured by the WM gradation extension processing circuit 30.

Since the configuration of the optical system and the original PWM drive processing are the same as those in the first embodiment, the description thereof will be omitted.
The M gradation extension processing method will be described.

FIG. 10 shows the relationship between the brightness of scanning light and time. In FIG. 10, a period 35 from time t0 to t1 is a period used for PWM driving in the first embodiment.

Sav represents the average value of the brightness of the scanning light. Timing 36 at which the average brightness Sav of the scanning light becomes half
Is obtained outside the period from t0 to t1, and the PWM bit plane is driven by 1 bit at the entire timing. The display resolution can be extended by 1 bit by using the driving of this portion for 1 bit of gradation for extending.

Next, a circuit process that embodies the above process will be described with reference to FIGS. The PWM gradation expansion processing circuit 30 includes a buffer memory 31, a pulse output circuit 32, and a timing control circuit 33. Assuming that the quantization bit number of the video signal is 9 bits and the PWM drive is 8 bit processing, the case where the display resolution is 9 bits will be described. The quantizing circuit means for RGB video signals is omitted in the figure.

The upper 8 bits of the RGB video signal quantized by 9 bits are input to the PWM drive processing circuit 1, and PWM output is performed as in the first embodiment. On the other hand, the least significant bit of quantization is input to the PWM gradation expansion processing circuit 30,
It is input to the buffer memory 31. The concept of the buffer memory is similar to that of the first embodiment, and the entire image is m
The least significant bit data is temporarily stored in the memory area divided by × n.

The data stored in the memory is read out by the timing control circuit 33 as a pulse having a 1-bit length in accordance with the timing 36 of each scanning light of RGB (pulse output circuit 32), and the multiplexer (Mpx) 3
At 4, the signal is time-division multiplexed with the PWM drive output signal of the main line, is input to the image display panel 6, and is driven to obtain an image display.

(Third Embodiment) In the third embodiment, the improvement of the brightness and the extension of the display resolution are made compatible with each other.

FIG. 19 is a configuration diagram of the third embodiment, and FIG.
0, FIG. 21 and FIG. 22 described the processing method.
FIG. 19 shows an optical system including a light source unit 12, a condensing unit 11, a color separation optical system 10, a scanning unit 8 and a scanning optical system 9 of a scanning lens 7, a transmissive image display panel 6, and the same. A PWM drive processing circuit 1 for driving, a PWM gradation expansion processing circuit 30, and a luminance signal calculation output unit 50 are included.

Since the configuration of the optical system, the PWM drive processing, and the PWM gradation expansion processing are the same as those in the first and second embodiments, the description thereof will be omitted, and a method for improving the brightness will be described.

FIG. 20 shows scanning light emitted on the image display panel 6 in the third embodiment. The optical system is adjusted so that the scanning lights 19, 20, and 21 for each of the RGB colors have an overlap at the boundary as shown in the figure. As a result, the color mixing areas 52, 5 are formed at the boundary between the RGB scanning lights 19, 20, 21.
3, 54 can be done.

Next, FIG. 21 shows a PWM pattern of the third embodiment. 21. In addition to the divided RGB signal PWM pattern repeating units 58, 59, and 60 described in FIG. 20, FIG.
6, 57, and the PWM pattern which is always inserted in the part between each PWM pattern of RGB (61, 62, 63 of FIG. 21).

FIG. 22 shows the timing of the scanning light of each color of RGB and the PWM pattern. As is apparent from FIG. 22, when the boundary portions of RGB colors (61, 62, and 63 in FIG. 22) are added up, the RGB light is included equally, and thus when combined, white is combined. Utilizing this fact, the PWM pattern in this period drives the luminance signal component. Thereby, the brightness can be improved.

Next, a circuit configuration that enables the above processing method will be described with reference to FIG. The RGB signal data is input to the luminance signal calculation output circuit 50. It is generally well known that the luminance signal can be synthesized from the RGB signal by calculation. For example, in case of NTSC system, 0.3R
It is + 0.59G + 0.11B. Therefore, the brightness signal calculation output circuit 50 is configured by a circuit that performs the above-described calculation processing, and outputs the brightness signal data 51. The brightness signal data 51 is input to the PWM drive processing circuit 1 and is processed in the same manner as the RGB signal data, and the PWM of the image display panel 6 is processed.
Drive.

The present invention is not limited to the scope of the above embodiments, and various modifications and variations that may be considered in line with the gist of the present invention are not excluded from the scope of the invention. For example, although the condensing unit 11, the color separation optical system 10, and the scanning optical system 9 are described separately in FIG. 1, the present invention also includes the case where the respective functions are integrated and realized.
It can also be applied to a projection display using a transmissive or reflective image display panel. In FIG. 1, the PWM pattern of each RGB color per frame is divided into four and RGB is divided.
The case where the time division drive is repeated four times is shown, but the number of divisions is four.
It may be other than. Although the case where the display gradation is increased by 1 bit has been described with reference to FIG. 10, the display gradation can be increased by 2 bits or more by using the same idea.

A specific circuit configuration for implementing the PWM drive processing of the present invention, such as a memory configuration and a bus configuration for inputting image data to an image display panel, is limited to the specific circuit configuration shown in the present invention. However, it includes all that can realize the driving method of the present invention. For example, in the first embodiment, the case where the quantization bit number of the video signal is 8 bits is used in the second embodiment.
Although the case where the number of quantization bits of the video signal is 9 has been described, the number of quantization bits may be arbitrary.

In the above-described embodiment, the average value of the brightness of the scanning light × unit time is used as the predetermined value of the incident light amount for determining the timing of each display gradation bit of the PWM drive of the present invention. However, the present invention is not limited to this,
A predetermined value smaller than the average value × unit time may be used.

[0062]

As described above, according to the present invention, the following effects can be obtained.

The optical system has an optical system in which each color light of red, green, and blue is incident on the image display panel and continuously moves each color light on the image display panel, and the image display panel is PWM according to the timing of light passage. In a light valve type display that displays a full-color image by driving, 1) it is possible to eliminate discontinuity in display luminance change with respect to gradation change.

2) It is possible to eliminate the lack of smoothness of the image or the occurrence of pseudo contour when the number of quantization bits of the image is insufficient.

3) It is possible to provide a processing method / apparatus that achieves both improvement of display brightness and expansion of the number of quantization bits of video.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a first embodiment of the present invention.

FIG. 2 is a configuration diagram of the first embodiment of the present invention.

FIG. 3 is a diagram for explaining a conventional problem.

FIG. 4 is a diagram for explaining a conventional problem.

FIG. 5 is a diagram for explaining a conventional problem.

FIG. 6 is an explanatory diagram of the first embodiment of the present invention.

FIG. 7 is a PWM pattern diagram according to the first embodiment of the present invention.

FIG. 8 is a PWM pattern diagram according to the first embodiment of the present invention.

FIG. 9 is a configuration diagram of a second embodiment of the present invention.

FIG. 10 is a configuration diagram of a second embodiment of the present invention.

FIG. 11 is a diagram illustrating the principle of PWM driving.

FIG. 12 is an explanatory diagram of PWM drive pattern formation.

FIG. 13 is an explanatory diagram of PWM drive pattern formation.

FIG. 14 is an explanatory diagram of PWM drive pattern formation.

FIG. 15 is a configuration diagram of a specific example of a light collecting unit.

FIG. 16 is a configuration diagram of a specific example of a scanning unit.

FIG. 17 is a configuration diagram of a specific example of a PWM drive processing circuit.

FIG. 18 is a configuration diagram of a specific example of an image display panel.

FIG. 19 is a configuration diagram of a conventional PWN pattern.

FIG. 20 is a conventional PWN pattern.

FIG. 21 is a conventional PWN pattern.

FIG. 22 is a conventional PWN pattern.

[Explanation of symbols]

1 PWM drive processing circuit 2 buffer memory 3 PWM output circuit 4 PWM output control circuit 6 Image display panel 7 Scan lens 8 scanning means 9 Scanning optical system 10 color separation optical system 11 Light collecting means 12 Light source 13-divided bit plane (8 bits) 14 Conventional PWM pattern 15 PWM pattern of the present invention 16, 17, 18 scanning light band 30 PWM gradation expansion processing circuit 31 buffer memory 32 pulse output circuit 33 Timing control circuit 34 Multiplexer 35 Normal PWM drive period 36 bit extended PWM drive period 39, 40 data selector 50 Luminance signal calculation output circuit

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G09G 3/20 680 G09G 3/20 680C 3/34 3/34 J H04N 5/74 H04N 5/74 D 9 / 31 9/31 ZF term (reference) 2H093 NA61 NC16 NC28 ND08 ND17 ND34 NG02 5C006 AA01 AA14 AA15 AA17 AA22 AB01 AF03 AF04 AF06 AF44 AF46 BB29 BF02 EA01 JA11 FA29 FA01 FA05 FA02 FA01 FA05 FA02 FA01 GA09 BB03 EA03 BB02 CB03 BB03 EA02 5C080 AA10 BB05 CC06 DD01 EE19 EE29 GG09 GG12 GG15 GG17 JJ02 JJ06

Claims (7)

[Claims] 1. An image display panel comprising a large number of pixels capable of modulating incident light according to red, green, and blue color signals, and red, green, and blue color lights are continuously incident on the image display panel. An optical system for moving each color light on the image display panel, and a pixel corresponding to the color of the light incident on an arbitrary portion of the image display panel by a signal P matching the color of the incident light.
A display method of a color image display device comprising an image display panel drive circuit for WM driving, wherein a predetermined value of an incident light amount and a timing with which the predetermined value is obtained are obtained in advance, and further, each PWM driven display The timing of each PWM drive display gradation bit is set so that the display brightness of the gradation bit n becomes a product of the predetermined value and 2 ⁿ , and an image is displayed by using the set timing. Image display device display method. 2. The color image display method according to claim 1, wherein the predetermined value of the incident light quantity is an average value of brightness of scanning light × unit time. 3. An image display panel comprising a large number of pixels capable of modulating incident light according to red, green, and blue color signals, and red, green, and blue lights are continuously incident on the image display panel. And an optical system for moving each color light on the image display panel, and corresponding to the color of the light incident on any part of the image display panel, a pixel of that part is supplied with a signal matching the color of the incident light.
A color image display device including a WM-driven image display panel drive circuit, wherein a predetermined value of an incident light amount and a temporal timing for obtaining the predetermined value are obtained in advance, and further, a PWM drive display gradation bit A color image display device in which the timing of each PWM driving display gradation bit is set in advance so that the display brightness of ⁿ becomes a product of the predetermined value and 2 ⁿ , and image display is performed using the set timing. . 4. An image display panel comprising a large number of pixels capable of modulating incident light according to red, green, and blue color signals, and red, green, and blue color lights are continuously incident on the image display panel. And an optical system for moving each color light on the image display panel, and corresponding to the color of the light incident on any part of the image display panel, a pixel of that part is supplied with a signal matching the color of the incident light.
A display method of a color image display device comprising an image display panel drive circuit for WM driving, wherein a PWM pattern is added to a timing having a light amount which is half of a least significant expression bit of PWM driving, and a display gradation bit number is set. Color image display method to raise. 5. An image display panel comprising a large number of pixels capable of modulating incident light according to red, green, and blue color signals, and red, green, and blue lights are continuously incident on the image display panel. And an optical system for moving each color light on the image display panel, and corresponding to the color of the light incident on any part of the image display panel, a pixel of that part is supplied with a signal matching the color of the incident light.
A color image display device including a WM-driven image display panel drive circuit, wherein a PWM pattern is added to a timing having a light amount which is half of a least significant expression bit of PWM drive to increase a display gradation bit number. Display device. 6. An image display panel comprising a large number of pixels capable of modulating incident light according to red, green, and blue color signals, and red, green, and blue lights are continuously incident on the image display panel. And an optical system for moving each color light on the image display panel, and corresponding to the color of the light incident on any part of the image display panel, a pixel of that part is supplied with a signal matching the color of the incident light.
A method of displaying a color image display device comprising a WM-driven image display panel drive circuit, wherein the optical system provides an overlapping period of two adjacent colors for incident light to the image display panel, The display panel drive circuit drives the luminance signal component in the overlapping period of the two colors and adds a PWM pattern to the timing having a light amount of half the least significant expression bit of the PWM drive, thereby increasing the number of display gradation bits. Image display device display method. 7. An image display panel comprising a large number of pixels capable of modulating incident light in accordance with red, green, and blue color signals, and red, green, and blue lights are continuously incident on the image display panel. And an optical system for moving each color light on the image display panel, and corresponding to the color of the light incident on any part of the image display panel, a pixel of that part is supplied with a signal matching the color of the incident light.
A color image display device comprising a WM-driven image display panel drive circuit, wherein the optical system provides an overlapping period of two adjacent colors for incident light to the image display panel, The circuit drives a luminance signal component in an overlapping period of two colors and adds a PWM pattern to a timing having a light amount which is half of a least significant expression bit of PWM driving, thereby increasing the number of display gradation bits.