JPH10186311A - Sequential color display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform a high definition picture display by providing a means writing the color picture of three colors to a display device with a time-shared system in the display period of one screen and a means controlling irradiation ranges by light sources. SOLUTION: Color video signals are written in a transmission light control type display device 11 every one line in an order from the upper side in the write direction of the video signal and the signals are written in a time-sharing manner in every screen of red color R, green color G, blue color B in one cycle of a vertical timing signal Vsync. For example, when the video signal R of red color is being written, in scanning lines, the video signal R of red color and the video signal B of blue color being a previous operation are respectively written in the screen of the upper part and the screen of the lower part and in the area of the middle part where the video signal R of red color is being written, light sources are made to be non-lighted and in areas of red color R and blue color B, light sources of corresponding colors are made to be lighted. For this purpose, a back light 13 is tripartited and made a constitution so that respective colors corresponding to respective color signals can be projected independently for every divided area.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color display device for illuminating a display device with a light source, and more particularly, to a structure in which the illuminating range of the light source is changed to increase the resolution and display a bright image. The present invention relates to a transmission type and a reflection type sequential color display device made possible.

[0002]

2. Description of the Related Art Conventionally, as a color display device for displaying a color image by disposing a color filter in front of a monochrome display, a flat color display device such as an LCD is known.

FIG. 12 is a perspective view showing an example of the configuration of a main part of a conventional flat panel color display device.
In the reference numerals in the figure, 1 indicates a monochrome display, 2 indicates a color filter, and R, G and B indicate red, green and blue filter elements.

FIG. 12 shows a flat color display device such as an LCD. A color filter 2 in which red, green and blue filter elements R, G and B are arranged in front of a monochrome display 1 is shown. Has been arranged. With such a configuration, color display becomes possible. Further, as another conventional color display technology, a method of performing color display by a projector, an HMD (head mounted display), or the like is also known.

FIG. 13 is a diagram showing an example of a system arrangement for explaining the principle of a conventional three-panel color display system. In the reference numerals in the figure, 3R, 3G, and 3B denote display devices that emit red, green, and blue light, respectively, 4 denotes a half mirror prism (or dichroic prism), and 5 denotes a projection surface.

As shown in FIG. 13, display devices 3R, 3G, which emit red, green, and blue colors, respectively.
If the 3B light is synthesized by the half mirror prism (or dichroic prism) 4 and projected on the projection surface 5, color display can be performed.

[0007]

As described in the prior art, a flat type color display device such as an LCD as shown in FIG. 12 is known. In the case of the color display, the resolution is reduced to 1/3 of that of the monochrome display, and the dots of the filter elements R, G, B are conspicuous, so that the image quality is reduced. Further, since the use efficiency of light is reduced to 1/3 by the color filter 2, not only the image is darkened, but also the color filter 2 is generally expensive, which is a factor of cost increase.
There was a problem. Further, as another color display system, a so-called three-panel color display system is also known as shown in FIG. However, this three-panel color display system has disadvantages that the size of the apparatus is increased and the cost is increased.

The first object of the present invention is to solve these disadvantages in the conventional color display system, to improve the resolution of the display device by three times, and to enable higher-definition image display. I do. A second object is to make it possible to display a natural image by making the dots of each of the colors R, G, and B of red R, green G, and blue B invisible. Even when used in projectors and HMDs,
A third object is to make it possible to display an image of the same quality as that of a three-panel type with a single-panel configuration (the invention of claim 8).

[0009]

According to a first aspect of the present invention, there is provided a display device having a display device and a light source of three colors, and displaying a color image by illuminating the display device with the light source. Means are provided for writing three color images to the display device in a time-division manner during the period, and means for controlling the irradiation range of the display device by the light source.

According to a second aspect of the present invention, in the sequential color display device of the first aspect, an LED is used as a backlight. According to a third aspect of the present invention, in the sequential color display device of the second aspect, the LEDs are arranged in a plane, so that a direct illumination method is employed.

According to a fourth aspect of the present invention, in the sequential color display device of the first aspect, the light of the LED is irradiated on the transmitted light control type display via the light guide plate.
According to a fifth aspect of the present invention, in the sequential color display device of the first aspect, a color liquid crystal shutter is provided, and each color of red, green, and blue is displayed by the color liquid crystal shutter. According to a sixth aspect of the invention, in the sequential color display device of the first aspect, a mechanical color filter is provided, and each of the red, green, and blue colors is displayed by the mechanical color filter.

According to a seventh aspect of the present invention, in the sequential color display device of the first aspect, a transmitted light control type device is used. According to the invention of claim 8, in the sequential color display device of claim 1,
Uses a reflected light control type device. According to the ninth aspect of the present invention, in a display comprising a display, an LCD backlight, and a field sequential color display device, the field sequential color display device is illuminated by an LCD light source, and the resolution is improved by utilizing the afterimage effect of the human eye. 3
It is rising twice.

[0013]

Next, an embodiment of a sequential color display device according to the present invention will be described with reference to the drawings. First Embodiment This first embodiment is mainly described in claims 1 and 7.
And corresponds to the invention of claim 9, but also relates to the invention of claims 2 to 6, and also to the invention of claim 8,
The invention of claim 1 is a basic invention. The first embodiment is directed to a transmission type sequential color display device, and focuses on a transmittance holding mechanism of a transmission light control type display device.
The irradiation range of the backlight of three colors corresponding to G and B is
The feature is that it is changed according to the writing range of the device.

FIG. 1 is a functional block diagram showing an example of an embodiment of a transmission type system configuration of a sequential color display device of the present invention. 1, reference numeral 11 denotes a transmitted light control type display device, 12 denotes a transmitted light control type display driver, 13
Is a backlight, 14 is a backlight lighting circuit, 15 is a field sequential color signal generation circuit, 16 is a personal computer, SG1 is an RGB color video signal, SG2 is a 3-video signal, SG3 is a 3 × video timing signal, Hsync indicates a horizontal timing signal, and Vsync indicates a vertical timing signal.

As shown in FIG. 1, a sequential color display device is a transmission light control type display device 1 in the case of a transmission type color display device.
1 and a transmitted light control type display driver 12, a backlight 13, a backlight lighting circuit 14, and a field sequential color signal generation circuit 15. The transmitted light control type display device 11
The device itself has a mechanism to maintain the pixel transmittance,
Until the next video signal is written, the transmittance of the previous video signal is maintained. The transmitted light control type display driver 12 transmits a red signal R, a green signal G, and a blue signal B (hereinafter, appropriately referred to as color signals R, G) to the transmitted light control type display device 11 by using the triple speed video timing signal SG3. , B) in this order. 3x video timing signal SG3
Is a field sequential color signal generation circuit 15
Is generated by the 3-video signal SG2, the horizontal timing signal Hsync, and the vertical timing signal Vsync, which will be described later in detail.

The backlight 13 is a light source of three colors of red, green and blue. The backlight 13 is arranged behind the transmitted light control type display device 11 and its lighting is controlled by a backlight lighting circuit 14, as shown in FIG. In this case, the backlight 13 is divided into three parts, and the backlight 13 is controlled so as not to be turned on during the writing of the color signal to the transmission light control type display device 11 (the area where the line being scanned exists). Field sequential color signal generation circuit 15
From an external circuit such as the personal computer 16.
The GB color video signal SG1 is input. The color video signal SG1 also includes a horizontal / vertical timing signal. In the case of the NTSC system, when a color signal is inputted, the color signals R, G, B of three colors and the horizontal / vertical timing signals Hsync, V
Convert to each component signal with sync and input. The field sequential color signal generation circuit 15 generates a 3-video signal SG2 and horizontal and vertical timing signals Hsync and Vsync. This figure 1
The configuration of the field sequential color signal generation circuit 15 will be described with reference to FIG.

FIG. 2 is a functional block diagram showing an example of a detailed configuration of the field sequential color signal generation circuit 15 shown in FIG. Reference numerals in the figure are the same as those in FIG. 1, 21 R is an A / D converter for red signal, 21 G is an A / D converter for green signal, 21 B is an A / D converter for blue signal, 22 is an output selection switch, and 23 is an output selection switch. D / A converter, 24 is a timing controller, SW-R1 and SW-R2 are switches for red signal, SW-G1 and SW-G2 are switches for green signal, SW-B1 and SW-B2 are switches for blue signal, FM
-R1 is the first red signal frame memory, FM-R2
Is the second red signal frame memory, and FM-G1 is the first
, FM-G2 denotes a second green signal frame memory, FM-B1 denotes a first blue signal frame memory, and FM-B2 denotes a second blue signal frame memory.

The red video signal R is written to the first or second red signal frame memories FM-R1 and FM-R2 via the switch SW-R1 on the input side. The first and second frame memories for red signal FM-R1, F-F
The M-R2 alternately performs a write operation and a read operation on a frame frequency basis. Such behavior is
The same applies to the green video signal G and the blue video signal B. The reading-side frame memory is read at a frequency three times the frame frequency. This read signal is output to the output side switches SW-R2, SW-
After passing through G2 and SW-B2, the output selection switch 22
, The 3-video signal SG
2 is generated. At this time, the read signal is D / A
The signal is converted by the converter 23 into an analog signal. The control of each unit in FIG. 2 is performed by the timing controller 24. Next, the generation operation of the 3-video signal SG2 and the divided lighting control of the backlight 13 will be described with reference to a timing chart.

FIG. 3 is a timing chart for explaining the operation of the transmission type color display device shown in FIG. 1 and an example of screen scanning. The reference numerals in the figure correspond to the reference positions in FIG.
Indicates a line being scanned, and t1 to t9 indicate time.

The field sequential color signal generation circuit 15 receives the input RGB color video signal SG1.
Is compressed to 1/3 in the time axis direction, and the 3-video signal S
G2 is generated. That is, as shown in FIG.
The RGB color video signals indicated by G1 are color signals R, G,
B, and one screen (vertical timing signal V
(1 cycle of sync). In the field sequential color signal generation circuit 15, one cycle of the vertical timing signal Vsync, as shown in SG2,
3--color signals R, G, B of three colors as video signal SG2
Are output in the order of red R, green G, and blue B.

The transmitted light control type display driver 12 performs processing such as amplifying and inverting the input 3-video signal SG2 to an appropriate voltage, and transmits the transmitted light as a 3 × video timing signal SG3 together with various timing signals. Send it to the control type display device 11. Therefore, the transmitted light control type display device 11 includes:
Red, green, and blue color video signals are sequentially written line by line from the top of each screen in the order of R, G, and B. More specifically, in SG2 of FIG. 3, one screen of the red color video signal and the next color signal G during the output period of the color signal R are output.
, One screen of a green color video signal is sequentially written during the output period of the next color signal B, and one screen of a blue color video signal is sequentially written during the output period of the next color signal B. As described above, the transmission type color display device shown in FIG. 1 uses the transmittance maintaining mechanism of the transmission light control type display device 11, and when the backlight 13 is turned on, the transmission light control A color image corresponding to the transmittance of the display device 11 (determined by the level of the color video signal written for each color) is displayed. The backlight 13 shown in FIG. 1 is divided into three areas, and is controlled so that an area including a line being scanned (writing) is not turned on. The backlight division lighting control method in this case will be described with reference to FIG.

FIG. 4 is a diagram for explaining the divided lighting operation of the transmitted light control type display device 11 shown in FIG.
(1) is a scanning direction, (2) is an RGB color video signal SG1.
(3) is a diagram showing a state of divisional lighting of the backlight 13. The reference numerals in the figure are the same as those in FIG. 3, and indicates the horizontal scanning direction and the writing direction of the video signal.

As shown in FIG. 4A, the transmitted light control type display device 11 is provided with a color signal line by line (horizontal scanning direction) from the top in the writing direction of the video signal, as indicated by the arrow. As shown in SG2 in FIG. 3, video signals are written in a time-division manner for each screen of red R, green G, and blue B in one cycle of the vertical timing signal Vsync. As described above, in the transmitted light control type display device 11, the device itself has a mechanism for holding the pixel transmittance, and the transmittance of the previous video signal is held until the next video signal is written. ing. For example, as shown in FIG. 4 (2), when a red video signal R is being written, a red video signal R is displayed on the upper screen and a red video signal R is The blue video signal B has been written by the previous operation. In the present invention, the area where the red video signal R in the middle is written is not lit, and the upper red R area and the lower blue B area light the corresponding color light source. In order to enable such an operation, the backlight 13 of FIG.
As shown in (3), the image is divided into three parts in the vertical direction, for example, upper part, middle part and lower part, so that each color corresponding to the video signals R, G and B can be independently irradiated for each divided area. Is configured.

With this configuration, in the area including the line being scanned, the backlight 13 is turned off, and the other areas can be kept in the lighted state. The lighting timing of the backlight 13 in this case is shown in the timing chart of FIG.
That is, the three waveforms shown as upper, middle, and lower portions in FIG. For example, in the waveform shown in the upper part of FIG. 3, when the video signal R is written to the upper region (time t1), the backlight 13 is turned off, and while the video signal R is written to the middle and lower regions (time t2, t3), Then, the backlight 13 is turned on. Next, when writing the video signal G to the upper region (time t4), the backlight 13 is turned off, and the backlight 13 is turned on during writing to the middle and lower regions (time t5, t6). Thereafter, when the video signal B is written to the upper area (time t7), the backlight 13 is similarly turned off, and the backlight 13 is turned on during writing to the middle and lower areas (time t8, t9). Let it.

Since the timing chart of FIG. 3 shows a case where the video signal R is divided into three regions, the upper backlight 13 is not lit while the video signal R is being written to the upper region (time t1). And the backlight 13 in the lower area is turned on, and the image of the video signal B written last time is displayed. Next, during a period (time t2) during which the video signal R is being written to the central region, the central backlight 13 is not lit, the backlights 13 in the upper and lower regions are in a lit state, and the upper portion is immediately illuminated. The written image of the video signal R is displayed in red, and the image of the previously written video signal B is displayed in the lower portion in blue. The lowermost part of FIG. 3 shows, by way of example, the display state of the screen when the video signal G is being written in the central area (time t5). In this case, since the video signal G is written in the central area, the backlight 1 in the central area is written.
3 is non-lighting, the backlight 1 in the upper and lower areas
Reference numeral 3 denotes a lighting state. In the upper area, the image of the video signal G written immediately before is displayed (by the green light source), and in the lower area, the image of the video signal R previously written is displayed (red light). (Light source).

As described above, in the first embodiment,
Since the backlight 13 is turned on except for the area where the video signal is being written, an efficient and bright image can be displayed. That is, the video signal (R, G, B) is changed by such a mechanism for changing the irradiation range.
In this case, the problem that an excessively high frequency is required is avoided, and an efficient and bright image display is realized with the backlight 13 having low power. In the first embodiment,
Since the description mainly focuses on the case where the backlight 13 is divided into three parts, the backlight is not turned on in the area where the video signal is being written, that is, in the range of 1/3 on the display screen. However, if the number of divisions is increased, the non-lighting range becomes narrower, so that a dark area due to the non-lighting range can be reduced. For example, if the backlight 13 is divided into six, the area in which the video signal is being written becomes 1/6 of the whole area, and only that area is not lit, so that the non-lit range is narrowed. As described in detail above, in the first embodiment, attention is paid to the transmittance holding mechanism of the transmitted light control type display device 11 shown in FIG. 1, and the video signals R, G, and B of each color are handled. The irradiation range of the color backlight light is changed according to the writing range of the device. In this case, one screen of the video signal R,
G and B are displayed for only 1/3 of the conventional time (so-called time-division method), but the resolution is tripled, so that a higher definition image is displayed as compared to the conventional one. be able to. In addition, since the dots of each color of the video signals R, G, and B cannot be seen, a natural image can be displayed.

Second Embodiment This second embodiment is mainly described in claims 2 and 3.
However, the present invention also relates to the first aspect of the present invention. In the first embodiment, the common configuration and operation of the sequential color display device of the present invention have been described. The second embodiment is characterized in that a direct lighting backlight is used as a specific example of the backlight 13.

FIGS. 5A and 5B show an example of a second embodiment of the sequential color display device according to the present invention. FIG. 5A is a side sectional view, and FIG. 5B is a top view below the light scattering plate 32. It is. In the reference numerals in the figure, 31a to 31c
Denotes each divided region, 32 denotes a light diffusion plate, 33 denotes a light separation plate, 34a to 34c denote LEDs, and A, B, and C denote divided upper, middle, and lower regions.

As shown in FIG. 5 (2), the backlight 13 is divided into three regions 31a to 31c by a light separating plate 33.
It is divided into regions, and each region is temporally divided and illuminated. In these three regions 31a to 31c, LEDs 34a to 34c are arranged as light sources of three colors R, G, and B, respectively, and can illuminate separately for each color. In FIG. 5, for simplification of the drawing, a pair of LEDs 34 is provided in each of the regions 31a to 31c.
Although a state where a to 34c are provided is shown, more LEDs 34a to 34c may be provided so as to obtain a required illuminance. Since the LEDs 34a to 34c and the light diffusing plate 32 are sufficiently separated, the light diffusing plate 32
Above, light is illuminated uniformly. These LEDs 34a-
34c is driven by the backlight lighting circuit 14 of FIG. As described above, in the second embodiment, the light diffusing plate 32, the light separating plate 33, and the LEDs 34a to 34
With c, the backlight area can be divided and illuminated. Therefore, efficient illumination by the backlight becomes possible, and a bright image can be displayed.

Third Embodiment The third embodiment mainly corresponds to the invention of the fourth aspect, but also relates to the first and second aspects of the invention. In the second embodiment, as a specific example of the backlight, the case where the direct lighting backlight is used has been described. The third embodiment is characterized in that a light guide plate type illumination backlight is used as a specific example of the backlight.

FIGS. 6A and 6B show an example of the third embodiment of the sequential color display device of the present invention, wherein FIG. 6A is a side view and FIG. 6B is a top view. In the reference numerals in the figure, 35R, 35G, 35B are LEDs, 36a
36c indicates a light guide plate, and 37 indicates a reflection plate.

The LEDs 35R, shown in FIGS. 6 (1) and 6 (2)
35G and 35B are connected to the backlight lighting circuit 14 of FIG. 1, and the upper, middle and lower portions are illuminated at the timing of the timing chart shown in FIG. In FIG. 6 as well, a pair of LEDs 3
5R, 35G, and 35B are shown, but a plurality of pairs of LEDs 35R, 3R are provided so that necessary illuminance can be obtained.
It is also possible to provide 5G and 35B. Light guide plate 36a
36c is made of, for example, a translucent milky white material that scatters light. The reflection plate 37 includes the LEDs 35R, 35
It functions to reflect light in the lower direction from G and 35B to the upper surface. Also in the third embodiment, the second
As in the embodiment, the backlight area can be divided and illuminated. Therefore, as in the second embodiment, efficient illumination is possible, and a bright image can be displayed.

Fourth Embodiment The fourth embodiment mainly corresponds to the fifth aspect of the present invention, but also relates to the first aspect of the present invention.
In the second and third embodiments, the case where the direct-type illumination backlight or the light guide plate type illumination backlight is used as a specific example of the backlight has been described. The fourth embodiment is characterized in that a backlight with a color liquid crystal shutter is used as a specific example of the backlight.

FIGS. 7A and 7B show an example of the fourth embodiment of the sequential color display device of the present invention, wherein FIG. 7A is a side view and FIG. 7B is a top view. The reference numerals in the figure are the same as those in FIG.

As shown in FIGS. 7A and 7B, the white light of the fluorescent lamp backlight 42 is
The light is converted into red R, green G, and blue B light by 1a to 41c and displayed. Also in this case, the display timing and the like are the same as those in FIG. Color liquid crystal shutters 41a-4
1c, one device configuration functions as a red R, green G, and blue B color filter. FIG. 8 shows the structure.

FIG. 8 is a diagram showing an example of the main structure of the color liquid crystal shutters 41a to 41c shown in FIG. The reference numerals in the figure are the same as those in FIG. 7, 43 denotes a polarizing filter, 44a to 44c denote color polarizing filters, LCD1 to LCD3 denote liquid crystal devices, and the arrows to indicate that a polarized color passes.

The color liquid crystal shutter 41a shown in FIG.
As shown in FIG. 8, the color polarizing filters 44a to 44c and the liquid crystal devices LCD1 to
It is composed of an LCD 3. Each of the color polarization filters 44a to 44c transmits a color polarized in the directions indicated by the arrows. For example, the color polarizing filter 44a transmits vertically polarized light through all three colors R, G, and B, and horizontally polarized light transmits only red R and green G. The liquid crystal devices LCD1 to LCD3 have a function of rotating the deflection direction by 90 degrees when no voltage is applied (at the time of OFF). FIG. 9 shows the relationship between the transmitted light by the combination of the functions described above and the voltage application to the liquid crystal devices LCD1 to LCD3.

FIG. 9 is a view showing an example of light transmitted through the color liquid crystal shutter.

As shown in FIG. 9, when transmitting, for example, red R, all the liquid crystal devices LCD1 to LCD
Set 3 to no voltage application (OFF). When transmitting green G, only the liquid crystal device LCD2 is applied (ON).
Then, the other liquid crystal devices LCD1 and LCD3 are set to no voltage application (OFF). When transmitting blue B, only no voltage is applied (OFF) to the liquid crystal device LCD2, and the other liquid crystal devices LCD1 and LCD3 are applied (ON). Also in the fourth embodiment, similarly to the second and third embodiments, the backlight area can be divided and illuminated. Therefore, as in the second and third embodiments, efficient illumination is possible, and a bright image can be displayed.

Fifth Embodiment The fifth embodiment mainly corresponds to the invention of claim 6, but also relates to the invention of claim 1 described above.
In the fourth embodiment, a case where a backlight with a color liquid crystal shutter is used has been described as a specific example of the backlight. The fifth embodiment is characterized in that a backlight with a mechanical color shutter is used as a specific example of the backlight.

FIGS. 10A and 10B show an example of a fifth embodiment of the sequential color display device of the present invention. FIG. 10A is a side sectional view and FIG. 10B is a top view. In the reference numerals in the figure, reference numeral 51 denotes a transmitted light control type display;
Reference numeral 2 denotes a color filter; 53R, 53G, and 53B, portions of the color filter 52; 54a to 54c, rollers; and 55, a motor. Lines during scanning as in FIG. Show.

As shown in FIG. 10A, a color filter 52 is rolled around the fluorescent tube backlight 42 in the direction of the arrow. This color filter 5
2 is separated into three parts 53R, 53G, 53B. The color filters 52 are formed by rollers 54a to 54a.
The roller 55c is held by the motor 55c.
Rotated by The top view of FIG. 10 (2) shows the case where the red signal R is written to the transmitted light control type display 51, and the line being scanned is the separation boundary of the color filter 52 for the red signal R and the blue signal B. It is in the state of becoming. Also in the fifth embodiment, similarly to the second to fourth embodiments, the backlight region can be divided and illuminated. Therefore, similarly to the second to fourth embodiments, efficient illumination becomes possible, and a bright image can be displayed.

Sixth Embodiment The sixth embodiment mainly corresponds to the eighth aspect of the present invention, but also relates to the first aspect of the present invention.
In the first to fifth embodiments, specific examples of the backlight in the transmissive display device have been mainly described. The sixth embodiment is characterized in that a reflective display device is used instead of a transmissive display device.

FIGS. 11A and 11B show an example of the sixth embodiment of the sequential color display device according to the present invention. FIG. 11A shows a sectional shape, and FIG. 11B shows a state viewed from the direction of arrow D. In the reference numerals in the figure, 61 is an LED, 6
2 is a diffusion plate, 63 is a lens, 64 is a reflective display device, 65 is a half mirror, and 66 is a large lens.

In the case of the reflective display device 64, the light emitted from the LED 61 is converted into diffused light by the diffusion plate 62, and the light is emitted to the reflective display device 64 through the lens 63. The irradiation range in this case is, for example, as shown in FIG.
The optical system is arranged so as to irradiate the whole range of. LED6
Reference numeral 1 denotes a light source for three colors of R, G, and B,
Reference numeral 2 denotes a rectangular shape for irradiating the reflective display device 64. The upper and lower sides of the lens 63 are cut linearly so as not to contact each other. In this case, the reflective display device 64 is a device capable of controlling the reflectance for each pixel. By providing a pixel control circuit such as a TFT on the back side of the reflective surface, the reflective display device 64 has a larger aperture than the transmissive type. Since the rate can be increased, a bright image can be displayed. The reflected light from the reflective display device 64 is reflected by the half mirror 65 and guided to the large lens 66. In this case, by appropriately setting the focal length of the large lens 66 and the distance between the large lens 66 and the reflection type display device 64, it can be used as a projector or a display for viewing a virtual image.

[0046]

According to a first aspect of the present invention, there is provided a sequential color display apparatus having a display device and a light source of three colors, and displaying a color image by illuminating the display device with the light source. Means for writing three color images to the display device in a time-division manner, and means for controlling the irradiation range of the display device by the light source. Therefore, the resolution of the display device is improved by a factor of three, and a higher definition image can be displayed. Further, since the dots of each of the colors R, G, and B of red R, green G, and blue B cannot be seen, a natural image display is possible.

In the sequential color display device of the second aspect, the LED is used as the backlight in the sequential color display device of the first aspect. Therefore, similarly to the display device of the first aspect, it is possible to efficiently illuminate with the backlight and obtain an effect that a bright image can be displayed.

According to the sequential color display device of the third aspect, in the sequential color display device of the second aspect, the LEDs are arranged in a plane, and the direct illumination method is employed. Therefore, the same effect as that of the color display device according to claim 2 can be obtained.

According to a fourth aspect of the present invention, there is provided the sequential color display device, wherein the light of the LED is applied to the transmitted light control type display via the light guide plate. Therefore, the same effect as that of the color display device of the first aspect can be obtained.

According to a fifth aspect of the present invention, there is provided the sequential color display device, wherein the color display device according to the first aspect is provided with a color liquid crystal shutter, and the red, green and blue colors are displayed by the color liquid crystal shutter. Therefore, the same effect as that of the color display device of the first aspect can be obtained.

According to a sixth aspect of the present invention, there is provided the sequential color display device according to the first aspect, wherein a mechanical color filter is provided, and each of the red, green, and blue colors is displayed by the mechanical color filter. Therefore, the same effect as that of the color display device of the first aspect can be obtained.

According to a seventh aspect of the present invention, there is provided the sequential color display device, wherein the color display device of the first aspect uses a transmitted light control type device. Therefore, the same effect as that of the color display device of the first aspect can be obtained.

In the sequential color display device according to the eighth aspect, the reflected light control type device is used in the color display device according to the first aspect. Therefore, the same effect as that of the color display device of the first aspect can be obtained, and it can also be used as a projector or a display for viewing a virtual image.

According to a ninth aspect of the present invention, there is provided a sequential color display device comprising a display, an LCD backlight, and a field sequential color display device, and irradiating the field sequential color display device with an LCD light source. , The resolution is tripled. Therefore, the same effect as that of the color display device of the first aspect can be obtained.

[Brief description of the drawings]

FIG. 1 is a functional block diagram showing an example of an embodiment of a transmission type system configuration of a sequential color display device of the present invention.

FIG. 2 is a functional block diagram showing an example of a detailed configuration of the field sequential color signal generation circuit 15 shown in FIG.

3 is a diagram showing a timing chart and an example of screen scanning for explaining the operation of the transmission type color display device shown in FIG. 1;

FIG. 4 is a diagram illustrating a divided lighting operation of the transmitted light control type display device 11 shown in FIG.

FIG. 5 is a diagram showing an example of a second embodiment of the sequential color display device of the present invention.

FIG. 6 is a diagram showing an example of a third embodiment of the sequential color display device of the present invention.

FIG. 7 is a diagram showing an example of a fourth embodiment of the sequential color display device of the present invention.

FIG. 8 shows color liquid crystal shutters 41a to 41 shown in FIG.
It is a figure which shows an example of the principal part structure about 1c.

FIG. 9 is a diagram illustrating an example of transmitted light of a color liquid crystal shutter.

FIG. 10 is a diagram showing an example of a fifth embodiment of the sequential color display device of the present invention.

FIG. 11 is a diagram showing an example of a sixth embodiment of the sequential color display device of the present invention.

FIG. 12 shows a conventional flat-panel color display device.
It is a perspective view showing an example of the important section composition.

FIG. 13 is a diagram showing an example of a system arrangement for explaining the principle of a conventional three-panel color display system.

[Explanation of symbols]

11 transmission light control type display device, 12 transmission light control type display driver, 13 backlight,
14 backlight lighting circuit, 15 field sequential color signal generation circuit, 16 personal computer

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[Procedure amendment]

[Submission date] August 21, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 2

[Correction method] Change

[Correction contents]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0003

[Correction method] Change

[Correction contents]

FIG. 12 is a perspective view showing an example of the configuration of a main part of a conventional flat panel color display device.
In the reference numerals in the figure, 1 indicates a monochrome display , 2 indicates a color filter, and R, G and B indicate red, green and blue filter elements.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

The first object of the present invention is to solve these disadvantages in the conventional color display system, to improve the resolution of the display device by three times, and to enable higher-definition image display. I do. A second object is to make it possible to display a natural image by making the dots of each of the colors R, G, and B of red R, green G, and blue B invisible. Even when used in projectors and HMDs,
A third object is to make it possible to display an image of the same quality as a three-plate type with a single-plate configuration .

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction contents]

According to a second aspect of the present invention, in the sequential color display device of the first aspect, an LED is used as an irradiation light source . According to the invention of claim 3, in the sequential color display device of claim 2,
The LEDs are arranged in a plane to provide a direct illumination method.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0024

[Correction method] Change

[Correction contents]

With this configuration, in the area including the line being scanned, the backlight 13 is turned off, and the other areas can be kept in the lighted state. The lighting timing of the backlight 13 in this case is shown in the timing chart of FIG.
That is, the three waveforms shown as upper, middle, and lower portions in FIG. For example, in the waveform shown in the upper part of FIG. 3, when the video signal R is written in the upper area (time t1), the upper area of the backlight 13 is turned off, and the writing is performed in the middle and lower areas (time t2). t3) is above the backlight
The area is lit. Next, the video signal G is displayed in the upper area.
Is written on the backlight 13 (time t4).
The section area and unlit, while writing to the central and lower part of the region (time t5, t6) lights the upper region of the backlight 13. Thereafter, when the video signal B is written in the upper area (time t7), the backlight 13 is similarly turned on.
The upper region is turned off, and the upper region of the backlight 13 is turned on during writing to the middle and lower regions (time t8, t9).

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0047

[Correction method] Change

[Correction contents]

In the sequential color display device according to the second aspect, the sequential color display device according to the first aspect uses an LED as an illumination light source . Therefore, similarly to the display device of the first aspect, efficient illumination by the illumination light source is enabled, and an effect that a bright image can be displayed is obtained. That is, the three waveforms shown as upper, middle, and lower portions in FIG.

[Procedure amendment 7]

[Document name to be amended] Drawing

[Correction target item name] Fig. 9

[Correction method] Change

[Correction contents]

FIG. 9

Claims (9)

[Claims] 1. A display device having a display device and a light source of three colors, and illuminating the display device with a light source to display a color image, wherein three colors are supplied to the display device during a display period of one screen. A sequential color display apparatus comprising: an image writing unit that writes an image in a time-division manner; and a control unit that controls an irradiation range of the display device by the light source. 2. The sequential color display device according to claim 1, further comprising an LED as a backlight. 3. The sequential color display device according to claim 2, wherein the LEDs are arranged in a plane and a direct illumination method is used. 4. The sequential color display device according to claim 2, wherein the light of the LED is irradiated on the transmitted light control type display via the light guide plate. 5. The sequential color display device according to claim 1, further comprising a color liquid crystal shutter, wherein the color liquid crystal shutter displays red, green and blue colors. 6. The sequential color display device according to claim 1, further comprising a mechanical color filter, wherein each of the red, green and blue colors is displayed by the mechanical color filter. 7. The sequential color display device according to claim 1, further comprising a transmission light control type device. 8. The sequential color display device according to claim 1, further comprising a reflection light control type device. 9. A display comprising a display, an LCD backlight, and a field sequential color display device, wherein the field sequential color display device is illuminated with an LCD light source to achieve a resolution of 3 by utilizing the afterimage effect of the human eye. A sequential color display device characterized in that it is doubled.