JP4338613B2 - Image display device - Google Patents

Description

  The present invention relates to an image display device capable of expanding a color reproduction range, and more particularly to a multi-primary color image display device.

  As a conventional multi-primary color image display device, a diffusion light-guiding member, for example, two wedge-shaped light guides are laminated, and two types of LED array light sources are arranged close to each end to diffuse light from the light source A light guide that illuminates the light guide is known (for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2004-118133 (page 6, lines 27-31, FIG. 1)

  In such a conventional image display device, since two types of LED array light sources are arranged close to the side surface of the light guide for diffusion, a plurality of monochromatic lights emitted from the LEDs on the LED array light source There is a problem that color mixture is insufficient, color unevenness and brightness unevenness occur on the left and right of the image display device, and the expansion of the color reproduction range over the entire screen is obstructed. Furthermore, at the end of the light guide for diffusion, the LEDs on the LED array light source are discretely arranged in a dot shape, so that bright spots are visually recognized, and expansion of the color reproduction range is limited. It was. In addition, there is a problem that the LED arrangement space is small, it is difficult to install the heat sink of the LED, the emission spectrum changes with the temperature rise of the LED, and the color reproduction range fluctuates.

  The present invention has been made in order to solve the above-described problems, and an object of the present invention is to obtain an image display device having a wide color reproduction range and no color unevenness or brightness unevenness.

This invention
A first light source that generates first illumination light having a first spectral characteristic;
A second light source for generating second illumination light having a second spectral characteristic different from the first spectral characteristic;
Control means for alternately emitting light from the first light source and the second light source;
A diffusion light guide member that diffuses light from the light source;
Each of the plurality of sub-pixels includes a plurality of pixels, and the transmittance of the plurality of sub-pixels to the illumination light from the diffusion light-guiding member is synchronized with the alternate light emission from the first and second light sources. Or a light valve that controls the reflectance in accordance with the color signal constituting the image signal,
The first light source is
A first light-emitting means having a plurality of types of light emitters that emit light of different colors,
A first color mixing light guide member that mixes light of different colors from the first light emitting means and guides the light to the diffusion light guide member;
The second light source is
A second light emitting means having a plurality of types of light emitters that emit light of different colors,
A second color mixing light guide member that mixes light of different colors from the second light emitting means and guides the light to the diffusion light guide member ;
The first and second light sources further include a color filter provided on an emission side of the color mixture light guide member, and light mixed by the color mixture light guide member is diffused and guided through the color filter. Led to the member,
The spectral characteristic of the color filter is different for each of the plurality of light sources .

  According to the present invention, light of different colors from a plurality of types of light emitters is mixed in the color mixing light guide member and then incident on the diffusion light guide member, so that uneven color and uneven brightness are eliminated.

Embodiment 1 FIG.
FIG. 1 shows an image display apparatus according to Embodiment 1 of the present invention. The illustrated image display apparatus includes first and second light-emitting means 11 and 13, first and second color mixing light guide members 12 and 14, a diffusion light guide member 15, a light valve 16, and a color converter. 22, first and second field memories 23 and 24, a signal switch 25, a light source driver 27, an illumination light switch 28, and a switch controller 29.

  For example, as shown in FIG. 2, the first light emitting means 11 includes light emitters of three colors of red, green, and blue, for example, LED arrays 11r, 11g, and 11b (light emitting diodes). The light emitting means 13 includes, for example, red and green light emitters, for example, LED arrays 13r and 13g, as shown in FIG. The LED arrays 11r, 11g, 11b of the first light emitting means 11 and the LED arrays 13r, 13g of the second light emitting means 13 have spectral characteristics (emission spectra) C11r, C11g, C11b, as shown in FIG. C13r and C13g are different from each other, their peaks are shifted from each other, their emission bands are narrow (color purity is high), and overlap of the emission bands is preferably small in order to expand the color reproduction range of the display image.

  The first light emitting means 11 and 13 are alternately connected to the light source driver 27 by the illumination light switch 28 and driven by the light source driver 27. The light source driver 27 and the illumination light switch 28 constitute control means for causing the first and third light emitting means to emit light alternately.

  The light from the first light emitting means 11 is mixed and homogenized by the first color mixing light guide member 12 and emitted. The spectral characteristics (emission spectrum) of the light emitted from the first color mixing light guide member 12 correspond to the synthesized spectral characteristics C11r, C11g, and C11b of the three color LEDs of the first light emitting means 11, respectively. The LED arrays 11r, 11g, and 11b have peaks corresponding to the spectral characteristic peaks. Similarly, the light from the second light emitting means 13 is mixed and homogenized by the second color mixing light guide member 14 and emitted. The spectral characteristics of the light emitted from the second color mixing light guide member 14 correspond to a combination of the spectral characteristics C13r and C13g of the two-color LEDs of the second light emitting means 13, and the LED arrays 13r and 13g respectively. It has a peak corresponding to the peak of spectral characteristics.

  Thus, the combination of the first light emitting means 11 and the first color mixing light guide member 12 constitutes the first light source 17 that emits the first illumination light LA having the first spectral characteristic, and the second light emission. The combination of the means 13 and the second color mixing light guide member 14 constitutes the second light source 18 that emits the second illumination light LB having the second spectral characteristic different from the first spectral characteristic.

  Light emitted from the first and second light sources 17 and 18 enters the diffusion light guide member 15. The diffusion light guide member 15 diffuses incident light over the entire display screen. As described above, since the first light emitting means 11 and the second light emitting means 13 are alternately switched by the illumination light switch 28, the first and second illumination lights LA and LB is sequentially emitted in a time division manner. That is, the combination of the first and second light sources 17 and 18 and the diffusion light guide member 15 diffuses the first and second illumination lights having different spectral characteristics from each other, that is, diffuses in a time-division manner and emits the illumination light. Means are configured.

  The light valve 16 has a plurality of pixels each including a plurality of subpixels, and is synchronized with the alternate light emission of the light sources 17 and 18 from the light sources 17 and 18 of the plurality of subpixels via the diffusion light guide member 15. The transmittance or reflectance with respect to the supplied illumination light is controlled according to the color signal constituting the image signal. For example, the light valve 16 includes a liquid crystal panel having a plurality of pixels Px arranged in a matrix as shown in FIG. Each pixel includes, for example, a plurality of subpixels Pr, Pg, and Pb in FIG. A plurality of sub-pixels Pr, Pg, and Pb of each pixel are covered with different colors, for example, red, green, and blue filters, and the sub-pixels Pr, Pg, and Pb are controlled by different color signals of image signals described later. Thus, the light from the diffusion light guide member 15 is converted into image light corresponding to the image signal.

On the other hand, the image signal PS supplied from the outside is guided to the color converter 22.
The color converter 22 converts the image signal PS into a first image signal SA corresponding to the first illumination light LA and a second image signal SB corresponding to the second illumination light LB. The first image signal SA includes three color signals corresponding to the spectral characteristics of the LED arrays 11r, 11g, and 11b of the first light emitting means 11. The second image signal SB includes two color signals corresponding to the spectral characteristics of the LED arrays 13r and 13g of the second light emitting means 13.

The first image signal SA and the second image signal SB are stored in the field memories 23 and 24, respectively.
The image signals accumulated in the field memories 23 and 24 are read at a predetermined timing, are alternately selected for each field by the signal switch 25, and are input to the light valve 16.
The light valve 16 has a plurality of, for example, three subpixels for each pixel as described above, and each subpixel is controlled by the corresponding color signal of the first image signal SA or the second image signal SB. The For example, each pixel Px has red, green, and blue sub-pixels Pr, Pg, and Pb, and when the first image signal is selected by the signal switch 25, the red, green, and blue sub-pixels are respectively When driven by the red, green, and blue color signals of the first image signal and the second image signal is selected, the red and green sub-pixels are the red and green colors of the second image signal, respectively. While driven by the signal, the blue sub-pixel is supplied with a zero level signal.

  Both the illumination light switch 28 and the signal switch 25 are controlled by the switching controller 29 so as to perform a switching operation in synchronization with each other. More specifically, in one subframe period, the illumination light switch 28 selects the first light emitting means 11, the signal switcher 25 selects the first image signal SA, and the next subframe. In the period, the illumination light switch 28 is controlled to select the second light emitting means 13, and the signal switch 25 is controlled to select the second image signal SB. Thereafter, the first light emitting means 11 and the second light emitting means 13 are alternately selected every subframe period, and the first image signal SA and the second image signal SB are alternately selected in synchronism with this. Is done.

  As a result of performing such control, an image corresponding to the first image signal SA appears on the output side of the light valve 16 in one subframe period, and the second image signal SB in the next subframe period. An image corresponding to the above appears on the output side of the light valve 16. Since these are temporally synthesized by the viewer's eyes, the color reproduction range is compared with the case where the light valve 16 is irradiated only by the first light source 17 or the case where the light valve 16 is irradiated only by the second light source 18. A wide image can be obtained.

  Note that the period of “subframe” in the above description is a period of one frame when a display operation is performed with only one light source, unlike the case where two light sources are selected in a frame sequential manner as in the configuration of FIG. Corresponds to a half of

According to the above configuration, the LED arrays 11r, 11g, 11b, 13r, and 13g each have a high color purity, and the image signals correspond to the colors of the respective LED arrays 11r, 11g, 11b, 13r, and 13g. Therefore, the effect that the color reproducibility range can be expanded can be obtained.
Further, since the light from the light emitting means 11 and 13 is mixed by the color mixing light guide members 12 and 14 respectively and homogenized and then guided to the diffusion light guide member 15, color unevenness and brightness unevenness can be eliminated. .

Embodiment 2. FIG.
FIG. 6 shows an image display apparatus according to the second embodiment of the present invention. The image display apparatus according to the second embodiment is generally the same as the image display apparatus according to the first embodiment. However, the first and second light sources 17 and 18 are different in that they further include first and second heat radiating members 31 arranged in the vicinity of the first and second light emitting means 11 and 13. In addition, illustration of the members 1 to 5 and 7 to 9 in FIG. 1 is omitted.

  Since the LEDs of the LED array constituting the light emitting means 11 and 13 have a light emission recombination probability depending on the temperature, and the temperature coefficient differs depending on the material and light emission wavelength, it is preferable that each LED maintain a constant temperature. Moreover, it is preferable to perform temperature management collectively for each LED array. Therefore, as shown in FIG. 6, by providing the heat dissipating members 31 and 32 and cooling the light emitting means 11 and 13, the light emission wavelength of the LED having a large change in spectral characteristics due to temperature can be stabilized in each LED. . That is, by providing the heat dissipating members 31 and 32, the temperature drift amount of the light emitting means 11 and 13 is reduced, and the color fluctuation due to the temperature change can be reduced.

Embodiment 3 FIG.
FIG. 7 shows an image display apparatus according to Embodiment 3 of the present invention. The image display apparatus according to the third embodiment is generally the same as the image display apparatus according to the first embodiment. However, the first light source 17 further includes a first color filter 33 provided on the emission side of the first color mixture light guide member 12 (between the first color mixture light guide member 12 and the diffusion light guide member 15). And the second light source 18 includes a second color filter 34 provided on the emission side of the second color mixture light guide member 14 (between the second color mixture light guide member 14 and the diffusion light guide member 15). Furthermore, it differs in having it. In addition, illustration of the members 1 to 5 and 7 to 9 in FIG. 1 is omitted.

  By providing the color filters 33 and 34, unnecessary wavelength components of the light from the light emitting means 11 and 13 can be removed and filtered so as to have desired spectral characteristics, so that light with high color purity can be used, Accordingly, the color reproduction range can be further expanded.

  Furthermore, the spectral transmission characteristics of the color filters 33 and 34 can be different for each light source (17, 18), and can be optimized according to the spectral characteristics of the light emitting means 11 and 13, for example. Thereby, color purity can be improved and a color reproduction range can be expanded further.

As the color filters 33 and 34, a metal oxide or fluoride such as Ta ₂ O ₅ , SiO ₂ , MgF ₂ or the like is laminated to a thickness equal to or less than the wavelength of the target light, and reflected and transmitted at the layer boundary. A multilayer dielectric optical thin film filter of a functional thin film that controls transmission characteristics and reflection characteristics at a specific wavelength (wavelength band) using light interference may be used. A filter having spectral characteristics may be used.

If a filter having a comb-shaped spectral characteristic is used, the desired spectral characteristic can be obtained with higher accuracy and unnecessary wavelengths can be reduced, so that the color reproduction range can be further expanded.
That is, since only light having a required wavelength from a long wavelength to a short wavelength can be used for each light source, the color purity can be further increased and the color reproduction range can be further expanded.

Embodiment 4 FIG.
FIG. 8 shows an image display apparatus according to Embodiment 4 of the present invention. The image display apparatus according to the fourth embodiment is generally the same as the image display apparatus according to the third embodiment. However, the difference is that the first light source 17 further includes an optical switch 35 provided on the emission side of the first color filter 33 (between the first color filter 33 and the diffusion light guide member 15).

  The optical switch 35 is controlled to open and close in accordance with the driving of the first light emitting means 11 by the illumination light switch 28. That is, when the first light emitting means 11 is selected, the optical switch 35 is also opened, and when the first light emitting means 11 is not selected, the optical switch 35 is closed.

By such an operation, when the light emitting means 11 is turned on, the light mixed by the color mixing light guide member 12 is made incident on the diffusion light guide member 15, while when the light emitting means 11 is turned off, the light is mixed to the color mixing light guide member 12 except the light emitting means 11. For example, when a fluorescent material-excited LED is used as the light-emitting means 11 with light that circulates from the light or afterglow, these unnecessary light can be blocked. Note that afterglow also becomes a problem when a cold cathode fluorescent discharge tube is used as the light emitting means.
As the optical switch 35, it is desirable to use an electronic device such as a high-speed liquid crystal optical switch that has a high-speed response and high transmittance.

  In the example illustrated in FIG. 8, the optical switch 35 is provided on the emission side of the first color mixing light guide member 12. However, the optical switch 35 may be provided on the emission side of the second color mixing light guide member 14. Optical switches may be provided on both the emission side of the color mixture light guide member 12 and the emission side of the second color mixture light guide member 14. In any case, the optical switch is controlled to be opened and closed in synchronization with the turning on / off of the corresponding light emitting means (light emitting means forming a part of the same light source).

  By adopting such a configuration, afterglow when using a light emitting means having afterglow characteristics, such as a cold cathode discharge tube or a phosphor-excited LED, can be cut off in accordance with turning off of the light emitting means. It is possible to prevent a plurality of types of illumination light from entering the diffusing light guide member 15 at the same time, and use only light with high color purity, thereby expanding the color gamut.

Embodiment 5 FIG.
FIG. 9 shows an image display apparatus according to Embodiment 5 of the present invention. The image display apparatus according to the fifth embodiment is generally the same as the image display apparatus according to the first embodiment. However, the first light source 17 includes a third light emitting unit 41 and a third color mixing light guiding member 42 in addition to the first light emitting unit 11 and the first color mixing light guiding member 12, and the second light emitting unit 11 and the first color mixing light guiding member 42. The light source 18 is different in that it includes a fourth light emitting unit 43 and a fourth color mixing light guide member 41 in addition to the second light emitting unit 13 and the second color mixing light guide member 14. In addition, illustration of the members 1 to 5 and 7 to 9 in FIG. 1 is omitted.

The third light emitting means 41 has the same spectral characteristics as the first light emitting means 11 and is controlled to operate at the same timing. The fourth light emitting unit 43 has the same spectral characteristics as the second light emitting unit 13 and is controlled to operate at the same timing.
The illumination light LA ′ emitted from the third color mixture light guide member 42 has the same spectral characteristics as the illumination light LA emitted from the first color mixture light guide member 12, and the fourth color mixture light guide member. The illumination light LB ′ emitted from 44 has the same spectral characteristics as the illumination light LB emitted from the second color mixing light guide member 14.

The diffusion light-guiding member 15 is formed in a substantially rectangular plate shape, and a second short side 15a side end surface (also indicated by reference numeral 15a) and a second side located on the opposite side of the first short side 15a. The end surface on the short side 15b side (also denoted by reference numeral 15b) constitutes the first and second incident end surfaces, respectively.
And the 1st light emission means 11, the 1st color mixing light guide member 12, the 4th light emission means 43, and the 4th color mixing light guide member 44 are arrange | positioned in the vicinity of the 1st incident end surface 15a, and 2nd end surface The second light emitting means 13, the second color mixing light guide member 14, the third light emitting means 41, and the third color mixing light guide member 42 are disposed in the vicinity of 15b. The light emitted from the fourth color mixture light guide members 12 and 44 is incident, and the light emitted from the second and third color mixture light guide members 14 and 42 is incident from the second incident end face 15b side.

  Since it is such a structure, when the 1st light source 17 is selected, illumination light LA and LA 'from the 1st and 3rd color mixing light guide members 12 and 42 are the 1st and 2nd entrance end surfaces 15a, When the second light source 18 is selected, the illumination lights LB and LB ′ are incident from the first and second incident end faces 15a and 15b when the second light source 18 is selected. Is done. That is, illumination light is incident from both sides of the diffusion light guide member 15 when any light source is selected. In the first embodiment and the like, when the first and second light sources 17 and 18 are alternately selected, the side on which the illumination light is incident is also alternately changed, which causes flicker, color unevenness, and luminance unevenness. In the fifth embodiment, such flickering, color unevenness, and luminance unevenness can be eliminated.

  Although the diffusion light guide member 15 has been described as having a rectangular plate shape with respect to the fifth embodiment, a rectangular plate shape is used as the diffusion light guide member 15 in the first to fourth embodiments. obtain.

Embodiment 6 FIG.
FIG. 10 shows an image display apparatus according to Embodiment 6 of the present invention. The image display device according to the sixth embodiment is generally the same as the image display device according to the fifth embodiment. However, it differs in that it further includes first and second reflecting members 47 and 48, and further includes first to fourth heat radiating members 31, 32, 45, and 46, and guide members 51, 52, 53, and 54. . In addition, illustration of the members 1 to 5 and 7 to 9 in FIG. 1 is omitted.

  The first and second heat radiating members 31 and 32 are the same as the first and second heat radiating members 31 and 32 described in the second embodiment, and the first and second light emitting means 11 and 14 It is provided for cooling. The third and fourth heat radiating members 45 and 46 are the same as the first and second heat radiating members 31 and 32, but are provided for cooling the third and fourth light emitting means 41 and 43. ing.

  Similar to the fifth embodiment, the diffusion light guide member 15 is formed in a rectangular plate shape, and the first to fourth color mixture light guide members 12, 14, 42 and 44 are also formed in a rectangular plate shape. The diffusion light guide member 15 is overlaid. That is, the first color mixture light guide member 12 is laminated on the portion (first portion) 15c near the first incident end face 15a of the diffusion light guide member 15, and the fourth color mixture light guide member 44 is formed thereon. Are stacked. Similarly, the second color mixture light guide member 14 is laminated on the portion (second portion) 15d near the second incident end face 15b of the diffusion light guide member 15, and the third color mixture light guide member 42 is formed thereon. Are stacked.

The incident end faces 12 a, 14 a, 42 a, and 44 a provided on the first side of the first to fourth color mixing light guide members 12, 14, 42, and 44 are positioned closer to the center of the diffusion light guide member 15. The first to fourth light emitting means 11, 13, 43, and 44 are located in the vicinity of the incident end faces 12a, 14a, 42a, and 44a, and the generated light has a guide member 51 having a reflection surface on the inner surface. , 52, 53, and 54 so that light is incident from these incident end faces 12a, 14a, 42a, and 44a.
The emission end faces 12b, 14b, 42b, and 44b of the first to fourth color mixing light guide members 12, 14, 42, and 44 are provided on the side opposite to the first side.
The exit end face 12b of the first color mixture light guide member 12 and the exit end face 44b of the fourth color mixture light guide member 44 are substantially at the same position as the first entrance end face 15a of the diffusion light guide member 15 (in the illustrated example, the surface). The emission end face 14b of the second color mixture light guide member 14 and the emission end face 42b of the third color mixture light guide member 42 are the second incident end face 15b of the diffusion light guide member 15. Are provided at substantially the same position (so as to be flush with each other in the illustrated example).

Light emitted from the first and fourth light emitting means 11 and 43 and incident from the incident end faces 12a and 44a of the first and fourth color mixing light guide members 12 and 44 is emitted from the emission end faces 12b and 44b, The light is reflected (folded back) by the first reflection member 47 and is incident on the diffusion light guide member 15 from the first incident end face 15 a of the diffusion light guide member 15. Similarly, light emitted from the second and third light-emitting means 13 and 41 and incident from the incident end faces 14a and 42a of the color mixing light guide members 14 and 42 is emitted from the exit end faces 14b and 42b and is reflected by the second reflection. The light is reflected (folded) by the member 48 and is incident on the diffusion light guide member 15 from the second incident end face 15 b of the diffusion light guide member 15.
In order to perform such reflection efficiently, the first and second reflecting members 47 and 48 have semi-cylindrical inner surfaces. The illustrated reflecting member 47 has a semicylindrical surface as well as an inner surface.

  By setting it as such a structure, the dimension of the surface direction of a light valve can be made small. For example, when the light valve is composed of a liquid crystal panel, the color mixing light guide member, the light emitting means, etc. can be accommodated within the range of the screen size of the liquid crystal panel, and a compact image display device can be obtained.

  In addition, with reference to FIG. 10, the case where the feature of using the reflecting members 47 and 48 is added to the image display apparatus according to the fifth embodiment has been described. The features of using the reflecting members 47 and 48 can be combined.

It is a block diagram which shows the image display apparatus by Embodiment 1 of this invention. 3 is a schematic diagram illustrating a configuration example of a first light emitter used in Embodiment 1. FIG. 5 is a schematic diagram illustrating a configuration example of a second light emitter used in Embodiment 1. FIG. It is a figure which shows the spectral characteristic of the LED array which comprises the 1st and 2nd light-emitting body. 2 is a schematic diagram illustrating a configuration example of a light valve used in Embodiment 1. FIG. It is a block diagram which shows the image display apparatus by Embodiment 2 of this invention. It is a block diagram which shows the image display apparatus by Embodiment 3 of this invention. It is a block diagram which shows the image display apparatus by Embodiment 4 of this invention. It is a block diagram which shows the image display apparatus by Embodiment 5 of this invention. It is a block diagram which shows the image display apparatus by Embodiment 6 of this invention.

Explanation of symbols

  11, 13, 41, 43 Light emitting means, 11r, 11g, 11b, 13r, 13g Light emitter, 12, 14, 42, 44 Color mixing light guide member, 15 Diffusing light guide member, 16 Light valve, 22 Color converter, 23 , 24 field memory, 25 signal switching device, 27 light source driver, 28 illumination light switching device, 29 switching controller, 31, 32, 45, 46 heat radiation member, 33, 34 color filter, 35 optical switch, 47, 48 reflection Element.

Claims (7)

A first light source that generates first illumination light having a first spectral characteristic;
A second light source for generating second illumination light having a second spectral characteristic different from the first spectral characteristic;
Control means for alternately emitting light from the first light source and the second light source;
A diffusion light guide member that diffuses light from the light source;
Each of the plurality of sub-pixels includes a plurality of pixels, and the transmittance of the plurality of sub-pixels to the illumination light from the diffusion light-guiding member is synchronized with the alternate light emission from the first and second light sources. Or a light valve that controls the reflectance in accordance with the color signal constituting the image signal,
The first light source is
A first light-emitting means having a plurality of types of light emitters that emit light of different colors,
A first color mixing light guide member that mixes light of different colors from the first light emitting means and guides the light to the diffusion light guide member;
The second light source is
A second light emitting means having a plurality of types of light emitters that emit light of different colors,
A second color mixing light guide member that mixes light of different colors from the second light emitting means and guides the light to the diffusion light guide member ;
The first and second light sources further include a color filter provided on an emission side of the color mixture light guide member, and light mixed by the color mixture light guide member is diffused and guided through the color filter. Led to the member,
The image display device according to claim 1, wherein spectral characteristics of the color filter are different for each of the plurality of light sources .   The image display device according to claim 1, wherein the plurality of light sources further include a heat radiating member provided in the vicinity of the light source of the light emitting means. The image display device according to claim 1 , wherein the color filter has comb-shaped spectral characteristics. A first light source that generates first illumination light having a first spectral characteristic;
A second light source for generating second illumination light having a second spectral characteristic different from the first spectral characteristic;
Control means for alternately emitting light from the first light source and the second light source;
A diffusion light guide member that diffuses light from the light source;
Each of the plurality of sub-pixels includes a plurality of pixels, and the transmittance of the plurality of sub-pixels to the illumination light from the diffusion light-guiding member is synchronized with the alternate light emission from the first and second light sources. Or a light valve that controls the reflectance in accordance with the color signal that constitutes the image signal
Have
The first light source is
A first light-emitting means having a plurality of types of light emitters that emit light of different colors,
A first color mixing light guide member that mixes light of different colors from the first light emitting means and guides the light to the diffusion light guide member;
The second light source is
A second light emitting means having a plurality of types of light emitters that emit light of different colors,
A second color mixing light guide member that mixes light of different colors from the second light emitting means and guides the light to the diffusion light guide member;
At least one of the first and second light sources has an optical switch provided on the emission side of the color mixing light guide member, and the optical switch is opened in synchronization with the light emission of the light emitting means of the light source. , images display you being controlled so as to be closed in synchronism with the dark. A first light source that generates first illumination light having a first spectral characteristic;
A second light source for generating second illumination light having a second spectral characteristic different from the first spectral characteristic;
Control means for alternately emitting light from the first light source and the second light source;
A diffusion light guide member that diffuses light from the light source;
Each of the plurality of sub-pixels includes a plurality of pixels, and the transmittance of the plurality of sub-pixels to the illumination light from the diffusion light-guiding member is synchronized with the alternate light emission from the first and second light sources. Or a light valve that controls the reflectance in accordance with the color signal that constitutes the image signal
Have
The first light source is
A first light-emitting means having a plurality of types of light emitters that emit light of different colors,
A first color mixing light guide member that mixes light of different colors from the first light emitting means and guides the light to the diffusion light guide member;
The second light source is
A second light emitting means having a plurality of types of light emitters that emit light of different colors,
A second color mixing light guide member that mixes light of different colors from the second light emitting means and guides the light to the diffusion light guide member;
The first light source is
A third light emitting means having the same plurality of types of light emitters as the first light emitting means;
A third color mixing light guide member for mixing light from the third light emitting means,
The second light source is
A fourth light emitting means having the same plurality of types of light emitters as the second light emitting means;
A fourth color mixing light guide member for mixing light from the fourth light emitting means,
The diffusion light-guiding member has a rectangular plate shape, and has a first incident end face and a second incident end face located on opposite sides of each other;
Light emitted from the first and fourth color mixture light guide members is incident from the first incident end surface of the diffusion light guide member,
The emitted light of the second and third color mixing light guide members is incident from the second incident end face of the diffusion light guide member,
The control means, the third light emitting means to emit simultaneously with the first light emitting means, the fourth light emitting means said second light emitting means and the images display you characterized in that emit light at the same time . A first light source that generates first illumination light having a first spectral characteristic;
A second light source for generating second illumination light having a second spectral characteristic different from the first spectral characteristic;
Control means for alternately emitting light from the first light source and the second light source;
A diffusion light guide member that diffuses light from the light source;
Each of the plurality of sub-pixels includes a plurality of pixels, and the transmittance of the plurality of sub-pixels to the illumination light from the diffusion light-guiding member is synchronized with the alternate light emission from the first and second light sources. Or a light valve that controls the reflectance in accordance with the color signal that constitutes the image signal
Have
The first light source is
A first light-emitting means having a plurality of types of light emitters that emit light of different colors,
A first color mixing light guide member that mixes light of different colors from the first light emitting means and guides the light to the diffusion light guide member;
The second light source is
A second light emitting means having a plurality of types of light emitters that emit light of different colors,
A second color mixing light guide member that mixes light of different colors from the second light emitting means and guides the light to the diffusion light guide member;
The diffusion light guide member and the color mixture light guide member are plate-shaped and overlap each other, and further include a reflection member that causes light emitted from the color mixture light guide member to enter the diffusion light guide member. and images display device you. A cylindrical inner surface in which the exit end face of the color mixing light guide member and the entrance end face of the diffusion light guide member are disposed adjacent to each other, and the reflection member is provided to face the exit end face and the entrance end face The image display device according to claim 6 , comprising:

Images