JPH11231316A - Color image display - Google Patents

Abstract

[PROBLEMS] To provide a color image display device provided with an illumination system that is small and compact, has low power consumption, and has high uniformity of illuminance distribution of a display image. A color image display device according to the present invention comprises R, G,
Three pixels corresponding to the three colors B are regarded as one unit of color pixels, and the color pixels are arranged two-dimensionally adjacent to each other.
Single-panel color display liquid crystal display means 4 for spatially dividing color information of characters and images divided into three colors of G and B into three elements for display, and illuminating means for illuminating the liquid crystal display means And the lighting means are LEDs of three colors of R, G, B
Are combined into one light source unit, and an LED light source array 1 in which a plurality of the one set of light source units are arranged two-dimensionally adjacent to each other, and one lens unit corresponds to the one set of light source units And a microlens array 3 composed of unit lenses corresponding to the respective color pixels of the liquid crystal display means 4 divided into three colors.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a liquid crystal display (LC).
D: VS (Virt) using Liquid Crystal Display
ual Screen) type display, head up display (HUD), head mounted display (HM)
D), a color image display device such as a liquid crystal projector, or an LCD TV, a notebook computer, a finder of a video projector, a display device of a navigation system,
The present invention relates to a color image display device applied to a real projection TV, a front projection TV, and the like.
The present invention relates to a color image display device having a feature in a CD illumination system.

[0002]

2. Description of the Related Art The following technologies are related to a color image display device using a liquid crystal display (LCD) and its illumination system. `` Light source for projectors '' Tadatoshi Higashi, Optics, Vol.25, No.
6 (June. 1996) 296-300. Among the metal halide lamps, halogen lamps, and xenon lamps used in liquid crystal projectors, he describes the advantages of DC lighting, spectral distribution, luminance distribution, life characteristics, luminous efficiency, etc., focusing on metal halide lamps. It also refers to halogen lamps, xenon lamps, and illumination optical systems. "Backlight system" Hirokazu Kimura, O + E, No.207
(Feb. 1997) 108-114. After an overview of various types of backlights for LCDs, the technical trends of backlight systems using fluorescent lamps, mainly for notebook personal computers (notebook PCs), are described. Describes the technology of the system. "Sanyo Electric develops rear-projection television with 50% reduction in parts cost compared to conventional products" NIKKEIELECTRONICS Oct. 21, 1996 (No.67
4) 18-19. A color projector using a single diffracted photon is described as a color separator of a light source of a color projector using a single-panel liquid crystal panel. "Image display device", JP-A-8-76078. In an image display device including a light source, a color liquid crystal panel, and a convex lens, and irradiating light emitted from the light source to the color liquid crystal panel so as to view an image, a red (R), green (G) ) And blue (B) LEDs (light emitting diodes) are arranged so as to substantially coincide with the optical axis of the color liquid crystal panel. Alternatively, a monochrome liquid crystal panel is used instead of the color liquid crystal panel, and R, G, B
Are sequentially lit in time, and a video signal corresponding to each color is sequentially and sequentially lit in synchronization with this.

[0003]

Although the light source of the LCD projector has recently started to output less than 100 W, as shown in the above-mentioned prior art, the light source for a large projector may exceed 150 W and exceed 1 KW. Since a large amount of heat is generated, a cooling device is required, and the illumination system has become very large and complicated, including removal of heat rays, division of colors, and a cooling device. In addition, there is a problem that power consumption of the light source is large and energy consumption for cooling is large. On the other hand, in a liquid crystal display device such as a notebook personal computer, a portable TV, and a video camera, an illumination method called a backlight shown in the related art is generally used, and a cold cathode fluorescent lamp is used as a light source. , 1
Power consumption of about 10 W is common. In this case, only about 30% of the emitted light is used for the LCD because a diffusion plate or a light guide plate is used.
Since the LCD does not illuminate the light, and only about 6% of the light passes through the LCD, less than 1% of the input power comes out of the LCD. As a result, the power consumption of the backlight accounts for 2/3 or more of the entire LCD module.

Conventionally, in a color display using a single-panel LCD, a display area for R, G, B information is divided into three fine stripes, and R, G, B filters are arranged at corresponding positions. Color display, but the light absorption loss by the filter was large, causing a reduction in efficiency. On the other hand, as shown in the prior art, a method of separating R, G, and B by using a dichroic mirror or a diffracted photon without using a filter was announced, and the efficiency was reduced, and the size and cost were reduced. However, power consumption has not yet been sufficiently reduced.

[0005] The method which appeared there is a light emitting diode (L
ED). In the prior art invention,
LED is used mainly for LCD lighting used in video camera viewfinders and head mounted displays (HMD).
Try to use. In this case, since the image is formed on the retina, the amount of light is very small. According to the prior art invention, in an image display device including a light source, a color liquid crystal panel, and a convex lens, and irradiating light emitted from the light source to the color liquid crystal panel so as to view an image, Each LED of B is substantially coincident with the optical axis of the color liquid crystal panel. Alternatively, a monochrome liquid crystal panel is used in place of the color liquid crystal panel,
There has been proposed a method in which G and B are sequentially turned on in time, and video signals corresponding to respective colors are sequentially turned on in synchronization with this.
However, in the system using this LED, the power consumption becomes extremely small, and Table 1 on p.
Although power consumption of less than 0.1 W is likely to be sufficient as described above, it is said that LEDs are arranged on the optical axis,
It seems that they are considering using one LED for each color. In this case, the screen may not be uniformly illuminated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks of the prior art, and is an LED for a single-panel type color LCD, which is small and compact, has low power consumption, and has high uniformity of illuminance distribution of a display image. An object of the present invention is to provide a color image display device including an illumination system using a light source.

[0007]

A color image display device according to the present invention uses three pixels corresponding to three colors of red (R), green (G), and blue (B) as one unit of color pixels. Single-panel color display in which color pixels are arranged two-dimensionally adjacent to each other and color information of characters and images divided into three colors of R, G, and B are spatially divided and sequentially divided into three elements. Liquid crystal display means (LCD), and illumination means for illuminating the liquid crystal display means. Further, in the color image display device of the present invention, the illuminating means may be one of R, G and B.
A light emitting diode light source array (LEDA) in which a plurality of color light emitting diodes (LEDs) are combined into one light source unit, and a plurality of the set of light source units are two-dimensionally arranged adjacent to each other.
A condenser lens array (CLA) in which one lens unit corresponds to one set of light source units; and three color pixels (R, G, B) of the liquid crystal display means divided into the three colors.
And a microlens array (MLA) composed of a unit lens corresponding to each pixel (claim 1).

According to the present invention, in the color image display device, a condenser lens array (C
When the number of lens elements constituting LA) is N and the number of lens elements constituting the microlens array (MLA) is n,
It is characterized in that 1000N <n (claim 2).

Further, according to the present invention, in the above color image display device, light emitting diodes (LE) of three colors of the illuminating means are provided.
P) is the pitch of the array of D), α is the pitch of the pitch with respect to the condenser lens array (CLA), fc is the focal length of the unit lens that is a component of the condenser lens array, and fc is the microlens array (MLA). The focal length of the unit lens, which is a component, is fm, and R,
When the pitch of the pixels of the G and B corresponding portions is Pl, the following equation is substantially satisfied (claim 3). Ps / fc = Pl / fm = tanα

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a view showing the concept of an illumination optical system of a color image display device according to the present invention. In the drawing, reference numeral 1 denotes an LED light source array (LEDA), 2 denotes a condenser lens array (CLA), and 3 denotes a micro lens array ( MLA) and 4 are liquid crystal display means (LCD) such as a liquid crystal display panel.

The LED light source array 1 is a set of three color LEDs of red (R), green (G), and blue (B) to form one light source unit 1a. One set of the three color LEDs is integrated as one light source unit 1a corresponding to one unit of the condenser lens 2a of the condenser lens array 2. Since the LED light source array 1 is disposed apart from the condenser lens array 2 by a distance substantially corresponding to the focal length: fc of the unit lens 2a, the light beam emitted from the unit lens 2a of the condenser lens array 2 is almost a parallel light beam. Becomes In FIG. 1, the luminous flux emitted from the G-color LED located at the center among the three colors R, G, and B is a parallel luminous flux substantially parallel to the optical axis of the unit lens 2a of the condenser lens array 2. R, B color L
The light beam emitted from the ED becomes a substantially parallel light beam inclined at an angle of ± α with respect to the optical axis of the unit lens 2a. If the pitch of the R, G, B LEDs is Ps, then Ps = fc × tanα.

As is apparent from FIG. 1, a light source unit 1a of a set of R, G, and B LEDs of an LED light source array 1 and a condenser lens 2a of one unit of a condenser lens array 2 are integrated into an array. , The light beam transmitted through the condenser lens array 2 is a wide light beam whose central G color is substantially parallel to the optical axis group of the condenser lens array 2 (FIG. 1 shows a sectional view. However, since the condenser lens arrays 2 are actually arranged in a direction perpendicular to the plane of the paper, this light flux becomes a planar parallel light flux.) Therefore, the light beams of the R and B colors become planar parallel light beams inclined at an angle of approximately ± α in the vertical direction of FIG. 1 with respect to the optical axis group as can be predicted from FIG.

In FIG. 1, R,
When a portion corresponding to each color of G and B is represented by each symbol of +, ·, ×, the liquid crystal display means 4 displays +, ·, × as shown in FIG.
Are divided into pixel portions for displaying information corresponding to the respective colors of R, G, and B, and are actually connected in stripes in the vertical direction on the paper surface (FIG. 1 shows a sectional view. However, actually, a two-dimensional array in which a large number of pixel arrays connected in a stripe shape are arranged in a direction perpendicular to the paper surface). On the other hand, the micro lens array 3 is a set of three color pixels 4a of R, G, B of the liquid crystal display means 4.
Is arranged in such a manner that one unit of the micro lens 3a corresponds to the unit, and the lens is disposed almost apart from the liquid crystal display means 4 by the focal length of the lens: fm. Therefore, the light flux of G color focuses on the vicinity of the pixel indicated by the symbol. Therefore, if the pitch Pl of the pixels of the R, G, and B corresponding portions of the liquid crystal display means 4 is set as Pl = fm × tanα, the luminous fluxes of the R and B colors focus on the vicinity of the pixel indicated by the + and × symbols, respectively. Will be tied.

In this way, the LED light source array 1 and the condenser lens array 2 are integrated with the required parallelism and positional accuracy, and the microlens array 3 and the liquid crystal display means 4 are integrated with the required parallelism and positional accuracy. Therefore, even though the combination accuracy between these two units is not so strict, the LED light source array 1 can display the R, G, and B information display portions (pixels of R, G, and B colors) of the liquid crystal display means 4. R, G, B light can be supplied without interference. The luminous fluxes of R, G, and B colors that have exited the liquid crystal display means 4 each have a numerical aperture of approximately sin α, and are in a substantially uniform direction on the front surface of the liquid crystal display means 4 (in the example of FIG. Is emitted somewhat downwards, the B-colored light is emitted somewhat upwards, and the G-colored light is emitted almost vertically symmetrically).

In FIG. 1, the light rays corresponding to R, G, and B are indicated by broken lines, solid lines, and dashed lines, respectively. However, in order to prevent complication, only the light rays in the central part of the drawing are shown accurately. In the upper part of the figure, among the light beams of the R color, the light beam passing through one micro lens (ML) 3a of the micro lens array 3 on the optical axis of one unit of the condenser lens (CL) 2a of the condenser lens array 2 is shown. C after leaving the LED
The light is collimated by L, enters the ML at an angle of -α with respect to the optical axis of the CL and the ML, converges to a pixel (+ sign) position corresponding to the R color on the liquid crystal display means 4, and then diverges. Shows how to go. Similarly, in the center of the figure, the light flux of G color in the center and the light flux of B color in the lower part are collimated after passing through CL,
The state of focusing after exiting the ML is shown. Needless to say, the light beams actually pass in the same manner in all the arrays. In FIG. 1, the liquid crystal display means 4 is shown as a single layer for simplicity. However, the liquid crystal display means 4 is actually a multilayer structure having a substrate, electrodes, a polarizing layer and the like. , A drive circuit for the liquid crystal display means 4, an image signal processing circuit, a control circuit for controlling these, a power supply circuit, etc., but are not shown for simplicity. Further, a display medium such as a lens and a screen for projecting the light emitted from the liquid crystal display means 4 is provided as necessary, but these are not shown.

Next, a comparative example with respect to the color image display device of the present invention is shown in FIGS. FIG. 2 is a diagram showing a schematic configuration of a “projector-type color image display device” described in the specification of Japanese Patent Application No. 9-228245 filed by the present applicant. In this projector type color image display device, light sources (LED arrays) 11, 1 of R, G, B colors are used.
2 and 13 are arranged on three planes, respectively, combined by a dichroic prism 10 and incident on a liquid crystal panel 15, and R, G, and B are time-divisionally lit to separate colors. The light of each color transmitted through the liquid crystal panel 15 is projected by a projection lens 16 on a display medium such as a screen. Since this color image display device uses a single-panel type liquid crystal panel and uses light sources (LED arrays) of R, G, and B colors, a high-quality color image having a high pixel density can be displayed, and troublesome color separation can be performed. Although it is unnecessary and consumes less power, three R, G, and B light sources
Since they are arranged on two planes and synthesized by a dichroic prism, there is a need for a space to arrange them,
There is a problem in terms of compactness.

FIG. 3 mainly shows an illumination optical system of a general three-panel LCD projector. Light from a projection lamp 20 is decomposed into light of each color of B, G, and R by three dichroic mirrors 21. Thereafter, the light passes through the corresponding liquid crystal panel 22, is synthesized by the dichroic prism 23, and is projected by the projection lens 24 onto a display medium such as a screen. In the illumination optical system of the three-panel LCD projector having such a configuration, a high-output metal halide lamp is used as a light source (projection lamp), and a dichroic mirror and a dichroic prism must be used.
It was complicated, expensive, and large. In addition, there is a problem that cooling of the light source and power consumption are large.

FIG. 4 mainly shows an illumination optical system of a single-panel LCD projector that does not use a color filter. Light from a light source 30 receives three dichroic mirrors 3.
After being separated into light of each color of R, G, and B in 1, the light is transmitted through a single-panel type liquid crystal panel (LCD) 32 and
The light is projected on a screen 35 by a projection lens 34 via the projection lens 3. The single-panel LCD projector having such a configuration can be simpler and smaller than the three-panel LCD projector of FIG. 3, but the output of the light source is the same as that of FIG. In addition, this illumination system is an example in which R, G, and B colors are separated as angles by three dichroic mirrors, thereby eliminating the need for a color filter having a large amount of absorption and increasing the amount of light, and has been put to practical use. However, since color separation is performed with a dichroic mirror,
There is a problem that a space for color separation is required, and that the cooling of the light source and the power consumption are large.

In contrast to the comparative example, the color image display device of the present invention shown in FIG.
By using an LED light source array in which LEDs of three colors of R, G, and B are set as a light source unit and a plurality of these light source units are arranged adjacent to each other, a color filter for color separation and a dichroic mirror are not required. Further, since a dichroic prism for combining as shown in FIG. 2 is not required, a simple, compact and highly efficient illumination optical system can be realized, and a compact color image display device with low power consumption can be provided.

[0020]

Next, specific embodiments of the present invention will be described.

(Embodiment 1) In FIG. 1, one light source 1a of an LED light source array 1 has, for example, an element size of 2 mm ×
R, G, B three-color LED of 1.25mm surface mount type
Are arranged in a line in close contact with the 1.25 mm side, the arrangement pitch becomes 2.5 mm. This is integrated with one unit of the lens 2a of the condenser lens array 2. The LED light source array 1 is separated from the condenser lens array 2 by, for example, the approximate focal length of the lens: fc =
Since they are arranged at a distance of 23.8 mm, the light beams emitted from the unit lenses of the condenser lens array 2 are substantially parallel light beams. At this time, the light beam of G color is substantially parallel to the optical axis of the unit lens of the condenser lens array 2,
The luminous flux of R and B colors is almost α with respect to the optical axis of the unit lens.
= Almost parallel light beams inclined at ± 6 degrees. In the illumination optical system of FIG. 1, a unit in which one unit of a light source, which is a set of LEDs of three colors of R, G, and B, and one unit of a lens of the condenser lens array 2 are arranged in an array, is a condenser. The light beam that has passed through the lens array 2 becomes a wide planar parallel light beam in which the G color is substantially parallel to the optical axis group of the condenser lens array 2. Similarly, the luminous fluxes of the R and B colors become wide parallel planar luminous fluxes inclined at an angle α = ± 6 degrees in the vertical direction of FIG. 1 with respect to the optical axis group. The size of the unit lens of the condenser lens array 2 varies according to the requirements for the luminous flux divergence angle, light amount, and unevenness of the LED. For example, assuming that the vertical direction is about 10 degrees, 2 × 23.8 × si
n10 to 8 mm square size is conceivable.

The pixel pitch of the liquid crystal display means (LCD) 4 varies greatly depending on the type and the number of pixels. For example, as the liquid crystal display means, the 15.1 type (1 diagonal) similar to the RGB vertical stripe type is used.
5.1 inch SXGA (color pixels: 1280 x
1024) Considering the LCD, the pixel pitch of the R, G, and B corresponding portions is Pl = 0.078 mm, so that the focal length of the unit lens 3a of the micro lens array 3 is fm = 0.74.
mm, the size is 0.234 mm square. Therefore, in this case, the number of lenses of the condenser lens array 2 or LE
The number of sets of R, G and B of the D light source array 1 is N = 35 × 28
= 980 or so. The number of lenses of the microlens array 3 is n = 1280 × 1024 = 131.
0720, so that n / N = 1337.5.

(Embodiment 2) In FIG. 1, one light source 1a of the LED light source array 1 has, for example, an element size of 2 mm ×
R, G, B three-color LED of 1.25mm surface mount type
Are arranged in a line in close contact with the 1.25 mm side, the arrangement pitch becomes 2.5 mm. This is integrated with one unit of the lens 2a of the condenser lens array 2. The LED light source array 1 is separated from the condenser lens array 2 by, for example, the approximate focal length of the lens: fc =
Since they are arranged at a distance of 23.8 mm, the light beams emitted from the unit lenses of the condenser lens array 2 are substantially parallel light beams. At this time, the light beam of G color is substantially parallel to the optical axis of the unit lens of the condenser lens array 2,
The luminous flux of R and B colors is almost α with respect to the optical axis of the unit lens.
= Almost parallel light beams inclined at ± 6 degrees. In the illumination optical system of FIG. 1, a unit in which one unit of a light source, which is a set of LEDs of three colors of R, G, and B, and one unit of a lens of the condenser lens array 2 are arranged in an array, is a condenser. The light beam that has passed through the lens array 2 becomes a wide planar parallel light beam in which the G color is substantially parallel to the optical axis group of the condenser lens array 2. Similarly, the luminous fluxes of the R and B colors become wide parallel planar luminous fluxes inclined at an angle α = ± 6 degrees in the vertical direction of FIG. 1 with respect to the optical axis group. The size of the unit lens of the condenser lens array 2 varies according to the requirements for the luminous flux divergence angle, light amount, and unevenness of the LED. For example, assuming that the vertical direction is about 10 degrees, 2 × 23.8 × si
n10 to 8 mm square size is conceivable.

The pixel pitch of the liquid crystal display means (LCD) 4 varies greatly depending on the type and the number of pixels. For example, type 4 (diagonal 4 inches) similar to the RGB vertical stripe type as the liquid crystal display means
Considering the SVGA (number of color pixels: 800 × 600) LCD, the pixel pitch of the R, G, B corresponding portion is Pl = 0.
Since it is about 033 mm, the focal length of the unit lens 3a of the micro lens array 3 is fm = 0.30 mm, and the size is about 0.1 mm square. Therefore, in this case, the number of lenses of the condenser lens array 2 or the number of sets of R, G, and B of the LED light source array 1 is about N = 10 × 8 = 80.
The number of lenses of the microlens array 3 is n = 800.
× 600 = 480000, so n / N = 600
It becomes 0.

(Embodiment 3) When relatively large R, G, and B three-color LEDs having a diameter of about 5 mm are arranged at a pitch of 7.5 mm, the LED light source array 1 is a condenser lens array 2
For example, the focal length of the unit lens 2a: fc = 80 mm
If they are arranged at a distance from each other, the light beam emitted from the unit lens 2a of the condenser lens array 2 becomes a substantially parallel light beam. At this time, the luminous flux of G color is condensed to the condenser lens array 2
Are substantially parallel to the optical axis of the unit lens, and the light beams of the R and B colors become substantially parallel light beams inclined at approximately α = ± 5 degrees with respect to the optical axis of the unit lens. The size of the unit lens of the condenser lens array 2 varies according to the requirements of the luminous flux divergence angle, light amount and unevenness of the LED. Can be considered.

The liquid crystal display means (LCD) 4 is the same type 4 (diagonal 4 inch) SVGA as in the second embodiment (the number of color pixels: 8).
00 × 600) LCD, the focal length of the unit lens 3a of the micro lens array 3 is fm = 0.30 mm and the size is about 0.1 mm square (the number of lenses of the micro lens array is n = 800 × 600 = 480000). In this case, the number of lenses of the condenser lens array 2 or L
The number of sets of R, G, and B of the ED light source array 1 is N = 3 × 2, which is quite small. Therefore, n / N = 8000
It becomes 0.

[0027]

As described above, in the color image display device of the first aspect, the illuminating means is a set of light emitting diodes of three colors of R, G, and B as one light source unit, and the one set of light emitting diodes is used. A light emitting diode light source array in which a plurality of light source units are arranged two-dimensionally adjacent to each other, a condenser lens array in which one lens unit corresponds to the set of light source units,
The color pixels (R, G,
B (3 pixels of B) and a microlens array composed of unit lenses corresponding to each pixel.
Eliminates the need for color separation color filters and dichroic mirrors used in image display devices such as projectors, and eliminates the need for dichroic prisms that combine color-separated light, making it simple, compact and highly efficient. And a compact color image display device with low power consumption can be provided.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, the number of lens elements constituting the condenser lens array of the illuminating means is N, and the number of lens elements constituting the micro lens array is n. Time, 1000N <
n, it is possible to provide a low-power-consumption, compact color image display device that can efficiently illuminate, has a simple, compact, and highly efficient illumination optical system.

In the color image forming apparatus of the third aspect, in addition to the configuration of the first aspect, the pitch of the arrangement of the light emitting diodes of the three colors of the illuminating means is Ps, and the angle formed by the pitch with respect to the condenser lens array is α. The focal length of the unit lens which is a component of the condenser lens array is fc, the focal length of the unit lens which is a component of the microlens array is fm, and the pitch of the pixels of the R, G and B corresponding portions of the liquid crystal display means is fc. When Pl is set, the relationship of Ps / fc = Pl / fm = tanα is established, so the light emitting diode light source array and the condenser lens array are integrated with the necessary parallelism and positional accuracy, and the micro lens array And the liquid crystal display means are integrated with the necessary parallelism and positional accuracy. Therefore, even if the combination accuracy between these two units is not so strict, R, , B information display unit (R, G,
B corresponding to the pixel corresponding to B) with respect to R,
G and B light can be supplied without interference. Therefore, there is provided a low power consumption and compact color image display device having a high uniformity of the illuminance distribution of a display image, no interference of R, G, and B lights, a simple, small, and highly efficient illumination optical system. it can.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of an illumination optical system of a color image display device according to the present invention.

FIG. 2 is a diagram showing a schematic configuration of an illumination optical system of a color image display device according to the prior application of the present applicant.

FIG. 3 is a diagram illustrating a configuration example of an illumination optical system of a conventional three-panel LCD projector.

FIG. 4 is a diagram illustrating a configuration example of an illumination optical system of a conventional single-panel LCD projector.

[Explanation of symbols]

Reference Signs List 1 LED light source array (LEDA) 1a Light source unit 2 Condenser lens array (CLA) 2a Condenser lens (CL) 3 Micro lens array (MLA) 3a Micro lens (ML) 4 Liquid crystal display means (LCD) 4a Color pixels (R, G , B corresponding to three pixels)

 ────────────────────────────────────────────────── ─── Continued on front page (72) Inventor Ken Ueda 1-3-6 Nakamagome, Ota-ku, Tokyo, Ricoh Co., Ltd.

Claims (3)

[Claims] 1. Three color pixels corresponding to three colors of red (R), green (G) and blue (B) are regarded as one unit of color pixels, and the color pixels are two-dimensionally arranged adjacent to each other. , G, B single-panel color display liquid crystal display means for displaying color information of characters and images divided into three colors spatially sequentially into three elements, and illumination for illuminating the liquid crystal display means A lighting device, wherein the illuminating means comprises a set of light emitting diodes of three colors of R, G, and B as one light source unit, and a plurality of the set of light source units adjacent to each other. A light source array of light emitting diodes, a condenser lens array in which one lens unit corresponds to one set of light source units, and a color pixel (R, G, (3 pixels of B) And a micro lens array. 2. The color image display device according to claim 1, wherein when the number of lens elements constituting the condenser lens array of the illuminating means is N and the number of lens elements constituting the micro lens array is n, 1000N <n. A color image display device, characterized in that: 3. The color image display device according to claim 1, wherein the pitch of the arrangement of the light emitting diodes of the three colors of the illuminating means is Ps, the angle formed by the pitch with respect to the condenser lens array is α, When the focal length of the unit lens which is a component of the micro lens array is fc, the focal length of the unit lens which is a component of the micro lens array is fm, and the pixel pitch of the R, G and B corresponding portions of the liquid crystal display means is Pl, A color image display device characterized by substantially satisfying the following expression. Ps / fc = Pl / fm = tanα