JP2002353519A - Led array and display device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LED array which can be made small-sized and make a full-color display by an LED chip which emits light beams of red, blue, and green. SOLUTION: This LED array 1, having LED chips of red, blue, and green regularly arrayed on a substrate 101, has the substrate 101 of a translucent material, the blue LED chip 2 on the surface of the substrate 101, the green LED chip 3 on the surface of the substrate 101 where its optical path will not overlap the path of the light emitted by the blue LED chip 2, and the red LED chip 4 below the substrate 101, where its optical path overlap with neither of the optical paths of the light beams emitted by the blue LED chip 2 and the green LED chip 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an LED array capable of performing full-color display in which red, green, and blue LEDs are juxtaposed on a substrate and a display device using the same.

[0002]

2. Description of the Related Art Recently, a blue L using a GaN semiconductor has been developed.
An ED (Light Emitting Diode) has been developed, and an LED display device capable of performing full-color display in parallel with a green LED and a red LED on a substrate has been produced.

As such an LED display device, there is a dot matrix display or the like in which a combination of red, green, and blue LEDs is formed as one dot, and these are patterned and arranged in a matrix on the entire display screen. First, a conventional LED used in such an LED display device will be described.

A simple principle of an LED will be described below with reference to the drawings.

FIG. 6 is a sectional view showing a conventional general LED.

In FIG. 6, reference numeral 300 denotes a conventional LED, 3
01 is an LED chip of the LED 300; 302 is a bonding wire drawn from an electrode 303 described later;
Is an electrode provided with a reflecting mirror of the LED 300; 304 is a bonding wire drawn from an electrode 305 described later;
Reference numeral 5 denotes an electrode provided to face the electrode 303, and reference numeral 306 denotes a transparent sealing material formed in a lens shape.

In the conventional LED configured as described above, light generated in the active layer of the LED chip 301 is
A part of the light is reflected by the reflecting mirror, and is collected above the LED 300 by the lens-shaped transparent encapsulant 306, together with the light traveling upward from the LED chip 301, and efficiently emits light. When a full-color display device is configured using such conventional LEDs, since each LED is a single-color LED, it is configured by combining red, green, and blue LEDs.

[0008]

However, in the display device using the above-mentioned conventional LED, such a single-color LE is used.
D to display a full-color display device, for example,
When a full-color television image device or the like having about 480 pixels in length and 640 pixels in width is constructed, each pixel is composed of three LEDs of red, green and blue because each LED has a diameter of about 5 mm. 4.8m long and 6.8m wide
It is difficult to form a small, full-color display device with a large screen, and the number of components constituting the display device increases.

[0009] The present invention solves the above-mentioned conventional problems, and uses an LED chip that emits red, blue, and green light to provide:
An object of the present invention is to provide an LED array which has a small number of parts, can be miniaturized, and can perform full color display, and a display device using the same.

[0010]

In order to solve the above-mentioned conventional problems, an LED array in which red, blue, and green LED chips are regularly arranged on a substrate, which is formed of a translucent material. The substrate, the green LED chip disposed on the surface of the substrate, and the green LED chip disposed on the surface of the substrate and disposed at a position where the path of the emitted light does not overlap with each other. A blue LED chip, and a red LED chip disposed below the substrate, the red LED chip being disposed at a position where the paths of emitted light and the green LED chip and the blue LED chip do not overlap with each other. Configuration.

With this configuration, it is possible to provide an LED array that can be reduced in size and capable of full-color display by using LED chips that emit red, blue, and green light.

In order to solve the above-mentioned conventional problems,
The display device of the present invention is an LED array in which red, blue, and green LED chips are regularly arranged on a substrate, wherein the substrate is formed of a light-transmitting material, and is disposed on a surface of the substrate. A green LED chip, a blue LED chip disposed on the surface of the substrate, and a blue LED chip disposed at a position where the path of emitted light does not overlap with the path of emitted light. A green LED chip, a blue LED chip, and a red LED chip disposed at positions where the paths of emitted light do not overlap with each other. have.

With this configuration, it is possible to provide a display device that can be reduced in size and can perform full-color display by using LED chips that emit red, blue, and green light.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS LED according to claim 1 of the present invention
The array is an LED array in which red, blue, and green LED chips are regularly arranged on a substrate, and a substrate formed of a translucent material, and a green LED arranged on a surface of the substrate. A chip and a green LE provided on the surface of the substrate
The blue LED chip disposed at a position where the path of the D chip and the emitted light do not overlap each other, and the paths of the green LED chip and the blue LED chip disposed at the bottom of the substrate and the emitted light are mutually And a red LED chip disposed at a non-overlapping position.

With this configuration, there is an effect that a red, green, and blue light source can be overlapped to form a full-color display.

Here, the red LED chip may be fixedly disposed on an upper surface of a flat holding member or the like disposed substantially parallel to the substrate below the substrate.

According to a second aspect of the present invention, there is provided the LED array according to the first aspect, wherein the blue LED chip and the green LED chip are disposed on the lower surface of the substrate. have.

With this configuration, in addition to the function of the first aspect,
The blue LED chip and the green LED chip are
By arranging in close proximity to the ED chip, each LE
This has the effect that the active layer of the D chip can be brought closer to reduce the parallax.

According to a third aspect of the present invention, there is provided the LED array according to the second aspect, wherein the blue LED chip and the green LED chip are sealed with a translucent material. Have.

With this configuration, in addition to the function of claim 2,
There is no need to dispose an LED chip on the surface of the translucent material, and the required material can be reduced by also serving as a sealing material.

According to a fourth aspect of the present invention, there is provided the LED array according to any one of the first to third aspects, wherein the translucent material is sapphire. Have.

According to this configuration, in addition to the function of any one of the first to third aspects, since a sapphire substrate having translucency is used as the substrate, sapphire has a lattice constant similar to that of GaN. Ga on sapphire substrate
When N is provided, a good crystal can be obtained and can be easily formed.

According to a fifth aspect of the present invention, there is provided the LED array according to any one of the first to fourth aspects, wherein the blue LED chip, the green LED chip, and the red LED chip are provided. And a unit in which at least one of them is arranged close to each other is defined as one unit, and one unit is arranged linearly.

According to this configuration, in addition to the function of any one of claims 1 to 4, the predetermined red LED chip, green LED chip, and blue LED chip are defined as one component, that is, one pixel. By linearly arranging the pixels, a full-color line display can be easily performed.

According to a sixth aspect of the present invention, there is provided the LED array according to the fifth aspect, wherein the linearly arranged LED chip groups are arranged substantially in parallel with each other, and a blue LED is provided.
It has a configuration in which a chip, a green LED chip, and a red LED chip are arranged in a plane.

With this configuration, in addition to the function of claim 5,
Since a predetermined red LED chip, green LED chip, and blue LED chip are one component, that is, one pixel, and one pixel is arranged in a plane, full-color area display can be easily performed. , And individual L
It has an effect that it can be reduced in size and the number of parts can be reduced as compared with the configuration in which the ED is combined.

The invention according to claim 7 of the present invention is the LED array according to any one of claims 1 to 6, wherein each of the green LED chip, the blue LED chip,
And the red LED chips have a chip area corresponding to each luminous efficiency.

According to this configuration, in addition to the function of any one of claims 1 to 6, in addition to the function of each color LED according to the luminous efficiency of red light, blue light, and green light emitted from each LED chip in one pixel. By changing the chip area, each LE
When all the D chips emit light, light emission close to white can be obtained. Further, when balancing the emission colors (white balance), there is no need to provide a drive current margin for each LED chip, and a wide dynamic range is obtained. Has the effect of ensuring that

The invention according to claim 8 of the present invention is the LED array according to any one of claims 1 to 6, wherein each of the green LED chip, the blue LED chip,
And a plurality of red LED chips are arranged close to each other so as to have an area corresponding to each luminous efficiency.

According to this configuration, in addition to the function of any one of claims 1 to 6, in addition to the functions of the LEDs of each color according to the luminous efficiency of the red light, blue light, and green light emitted from each LED chip in one pixel. By changing the number, when all of the LED chips emit light, it is possible to obtain light emission close to white, and when balancing the emission colors (white balance),
There is no need to provide a margin for the drive current for each LED chip, and an effect that a wide dynamic range can be secured.

According to a ninth aspect of the present invention, there is provided the LED array according to any one of the first to eighth aspects, wherein the substrate is a thin film made of optical black or a material having a low transmittance. , And has a configuration provided with a passing window through which blue light, green light, and red light pass.

According to this structure, in addition to the function of any one of the first to eighth aspects, a thin film made of optical black or a material having low transmittance is attached between the LED chips on the substrate in a grid pattern. Since each LED chip emits light, it is possible to enhance the contrast when each LED chip emits light,
This has the effect of reducing crosstalk in which light leaks to the ED chip and improving image quality when displayed.

According to a tenth aspect of the present invention, there is provided the LED array according to any one of the first to ninth aspects, wherein an optical black or a transmission factor is provided between the red LED chips. It has a configuration including a light-shielding portion formed in a lattice shape from a material made of a low material.

According to this structure, in addition to the function of any one of the first to ninth aspects, the reflection of red light, blue light, and green light is prevented, and the display contrast when each LED chip emits light is enhanced. Has the effect of being able to

The display device according to the eleventh aspect of the present invention comprises:
It has the structure provided with the LED array as described in any one of Claim 1 thru | or 10.

According to this configuration, there is an effect that a display device having a small number of components and a small and high-density display pixel can be formed.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

(Embodiment 1) FIG. 1 is a sectional view of a main part of an LED array according to Embodiment 1.

In FIG. 1, reference numeral 1 denotes the LED array according to the first embodiment, 2 denotes a blue LED chip, 3 denotes a green LED chip, 4 denotes a red LED chip, 101 denotes a blue LED chip 2 and a green LED. A sapphire substrate on which the chip 3 is disposed; 102, an n-GaN layer of the blue LED chip 2; 103, a blue LED chip 2
N electrode 104 is InGaN of the blue LED chip 2
The active layer 105 is p-AlGa of the blue LED chip 2.
N layer, 106 is a p-GaN layer of blue LED chip 2,
Reference numeral 107 denotes a p-electrode of the blue LED chip 2, reference numeral 108 denotes an opaque layer formed on the sapphire substrate 101, reference numeral 109 denotes a pass window formed on the sapphire substrate 101 by the opaque layer 108, and a blue light 110 passes through, and reference numeral 110 denotes a blue LED. Blue light emitted and emitted by the InGaN active layer 104 of the chip 2, 111 is the n-GaN layer of the green LED chip 3,
112 is the n-electrode of the green LED chip 3, 113 is the InGaN active layer of the green LED chip 3, 114 is the p-AlGaN layer of the green LED chip 3, and 115 is the green L
The p-GaN layer of the ED chip 3, 116 is a p-electrode of the green LED chip 3, 117 is a pass window formed on the sapphire substrate 101 by the opaque layer 108 and a green light 118 passes, and 118 is a green LED chip 3. The green light to be irradiated, 119 is a holding substrate on which the red LED chip 4 is provided, and 120 is the n-AlGaI of the red LED chip 4.
nP layer, 121 is n electrode of red LED chip 4, 12
Reference numeral 2 denotes an AlGaInP active layer of the red LED chip 4;
23 is a p-AlGaInP layer of the red LED chip 4,
Reference numeral 124 denotes a p-electrode of the red LED chip 4, 125 denotes an opaque layer, and 126 denotes a pass window formed on the sapphire substrate 101 by the opaque layer 108 and through which red light 127 passes.
Reference numeral 27 denotes red light emitted from the red LED chip 4.

Here, the sapphire substrate 101 is formed to be transparent so that the light of the LED passes therethrough.
Blue light 110 generated in the InGaN active layer 104 of the D chip 2 is extracted to the outside through a pass window 109 formed in the transparent sapphire substrate 101.

The green light 118 generated in the InGaN active layer 113 of the green LED chip 3 disposed on the sapphire substrate 101 is extracted through the passage window 117 formed on the sapphire substrate 101. Sapphire substrate 1
The red light 127 generated in the AlGaInP active layer 122 of the red LED chip 4 disposed on the holding substrate 119 disposed below 01 is extracted from the p-electrode 124 side and extracted through the passing window 126 of the sapphire substrate 101. .

As described above, L in the first embodiment is
According to the ED array, green and blue LED chips 2 and 3 are formed on a sapphire substrate 101, a red LED chip 4 is disposed below the LED chips 2 and 3, and passing windows 109, 117 and 126 are provided in the sapphire substrate 101. Accordingly, there is an effect that a full-color display can be performed by light transmitted through the passing window and a small-sized display device can be manufactured.

The blue and green LED chips 2 and 3
Can be arranged on either the front side or the back side of the sapphire substrate 101, but if the blue and green LED chips 2 and 3 of the sapphire substrate 101 are configured to extract light from the back side of the arrangement surface, the red LED chip 4 When the position of the active layer and the positions of the active layers of the blue and green LED chips 2 and 3 can be brought close to each other, when observing display light,
The parallax of each of red, blue, and green can be reduced.

An opaque layer 108 made of optical black or a material having a low transmittance is arranged between each light emitting chip on the sapphire substrate 101 or on the back surface of the sapphire substrate 101 so that red light 127, blue light 110 and green light 118 are transmitted. By providing the pass windows 109, 117, and 126 at the positions where the LED chips emit light, it is possible to reduce the crosstalk at the time of light emission of the LED chip and enhance the display contrast.

Further, by disposing an opaque layer 125 of a material having low optical transmittance or optical black between a plurality of red LED chips 4 arranged in parallel, reflection of blue light 110 and green light 118 is prevented, and Crosstalk when the red LED chip 4 emits light can be reduced, and display contrast can be enhanced.

(Embodiment 2) FIG. 2 is a plan view of a main part of an LED array according to Embodiment 2 of the present invention.

In FIG. 2, 1a is the LED array according to the second embodiment, 201 is a green LED chip,
1a is a passage window through which green light emitted from the green LED chip 201 passes, 202 is a red LED chip, 20
2a is a pass window through which red light emitted from the red LED chip 202 passes, 203 is a blue LED chip, 20
3a is a window through which the blue light emitted from the blue LED chip 203 passes, and 204 is the green LED chip 20.
1, a component formed with the red LED chip 202 and the blue LED chip 203 as one unit, 205 is a sapphire substrate as a substrate, and 205a is an opaque layer formed on the sapphire substrate 205.

The LED array according to the second embodiment is formed by arranging the components 204 linearly in the direction A.

As described above, L in Embodiment 2
Green LED that emits green light according to the ED array
Chip 201, red LED chip 202 for obtaining red light emission, blue LED chip 203 for obtaining blue light emission
Are combined into one component 204, and are arranged one-dimensionally on the sapphire substrate 205 in the direction of A, so that a full-color one-dimensional display element can be easily configured with a small number of components. Have.

(Embodiment 3) FIG. 3 is a plan view of a main part of an LED array according to Embodiment 3 of the present invention.

In FIG. 3, 1b denotes the LED array according to the third embodiment, 201 denotes a green LED chip,
1a is a pass window, 202 is a red LED chip, 202a
Is a pass window, 203 is a blue LED chip, 203a is a pass window, 204 is a component, 205 is a sapphire substrate, 2
Reference numeral 05a denotes an opaque layer, which is the same as that described with reference to FIG.

The LED array according to the third embodiment is formed by arranging the components 204 side by side in the directions B and C. The LED array described in the second embodiment is formed in a straight line. In addition, they are formed side by side in a plane.

As described above, L in the third embodiment
According to the ED array, in addition to the operation of the first embodiment, a green LED chip 201 for obtaining green light emission, a red LED chip 202 for obtaining red light emission, and a blue LED chip 203 for obtaining blue light emission Are combined into one component element 204, and are formed side by side on the sapphire substrate 205 two-dimensionally in the directions of B and C, so that a full-color two-dimensional display element can be easily formed with a small number of parts. Therefore, it is possible to achieve a small size and a high resolution.

(Embodiment 4) FIG. 4 is a plan view of an essential part of an LED array according to Embodiment 4 of the present invention.

In FIG. 4, 1c is the LED array in the fourth embodiment, 201 is a green LED chip, 20
1a is a pass window, 202 is a red LED chip, 202a
Is a pass window, 203 is a blue LED chip, 203a is a pass window, 204 is a component, 205 is a sapphire substrate, 2
Reference numeral 05a denotes an opaque layer, which is the same as that described with reference to FIG.

In the fourth embodiment, the components 204 are arranged in a plane, and the chip area of each LED chip is changed according to the luminous efficiency.

As described above, L in Embodiment 4
According to the ED array, a green LED chip 2 with high visibility
01 is reduced, and the chip area of each LED is changed according to each color like the red LED chip 202 and the blue LED chip 203, so that the color at the time of light emission is full-color two-dimensional near white. A display element is obtained, and white balance can be easily adjusted in image display and the like, and when displaying images by pulsing each LED chip, there is no need to secure a margin in the duty ratio for white balance adjustment. This has the effect that the dynamic range of the drive timing can be widened.

(Embodiment 5) FIG. 5 is a plan view of a main part of an LED array according to Embodiment 5 of the present invention.

In FIG. 5, 1d is the LED array according to the fifth embodiment, 201 is a green LED chip,
1a is a pass window, 202 is a red LED chip, 202a
Is a pass window, 203 is a blue LED chip, 203a is a pass window, 204 is a component, 205 is a sapphire substrate, 2
Reference numeral 05a denotes an opaque layer, which is the same as that described with reference to FIG.

In the fifth embodiment, the components 204 are arranged in a plane, and the number of LED chips included in each component 204 is changed according to the luminous efficiency.

As described above, L in Embodiment 5
According to the ED array, a green LED chip 2 with high visibility
01 is reduced, and the number of LED chips, such as the red LED chip 202 and the blue LED chip 203, is changed in accordance with the respective colors. A three-dimensional display element can be obtained, white balance can be easily adjusted in image display and the like, and when image display is performed by pulse lighting each LED chip, it is necessary to secure a margin in the duty ratio for white balance adjustment. In addition, there is an effect that the dynamic range of the drive timing can be widened.

Further, by forming each LED chip one-dimensionally or two-dimensionally and modulating the driving current of each LED chip by a video signal or the like, it is easy to reduce the size, weight and high resolution of one-dimensional or A two-dimensional display device can be configured.

[0063]

As described above, according to the LED array of the present invention, the following advantageous effects can be obtained.

According to the LED array according to the first aspect of the present invention, it is possible to provide an LED array capable of forming a full-color display by superposing red, green, and blue light sources.

According to the LED array according to the second aspect of the present invention, in addition to the effect of the first aspect, by disposing the blue LED chip and the green LED chip close to the red LED chip, It is possible to provide an LED array in which the active layer of each LED chip is brought close to each other and parallax can be reduced.

According to the LED array of the third aspect of the present invention, in addition to the effects of the second aspect, the LED array has
Since it is not necessary to dispose an ED chip and the surface of the LED can be configured to be flat, it is easy to form an opaque layer, and the sapphire substrate also serves as a sealing material, so that the material can be reduced. An LED array can be provided.

According to the LED array of the fourth aspect of the present invention, in addition to the effect of any one of the first to third aspects, by using a sapphire substrate having translucency as the substrate, sapphire can be reduced. Since the lattice constant is close to that of GaN, good crystals can be obtained when GaN is provided on a sapphire substrate, and the LED can be easily configured.
An array can be provided.

According to the LED array according to the fifth aspect of the present invention, in addition to the effects of any one of the first to fourth aspects, a predetermined red LED chip, a predetermined green LED chip,
By arranging the blue LED chip as one component, that is, one pixel, and linearly arranging one pixel at a time, it is possible to provide an LED array that can easily perform full-color line display.

According to the LED array described in claim 6 of the present invention, in addition to the effect of claim 5, a predetermined red LED chip, green LED chip, and blue LED chip are formed as one component, that is, one pixel. Since each pixel is arranged in a plane, full-color area display can be easily performed, and the size and the number of parts can be reduced as compared with a configuration in which individual LEDs are combined. An LED array that can be provided can be provided.

According to the LED array of the seventh aspect of the present invention, in addition to the effects of any one of the first to sixth aspects, each of the LED chips in one pixel emits red light, blue light, By changing the chip area of each color LED according to the luminous efficiency of green light, when all the LED chips emit light, it is possible to obtain light emission close to white and to balance the emission color (white balance). When each LED
It is possible to provide an LED array capable of securing a wide dynamic range without requiring a margin for the drive current in the chip.

According to the LED array of claim 8 of the present invention, in addition to the effects of any one of claims 1 to 6, the red light, blue light, By changing the number of LEDs of each color according to the luminous efficiency of green light, when all the LED chips emit light, it is possible to obtain light emission close to white, and to obtain a balance of luminescent colors (white balance). Therefore, it is possible to provide an LED array capable of securing a wide dynamic range without having to provide a drive current margin for each LED chip.

According to the LED array of the ninth aspect of the present invention, in addition to the effect of any one of the first to eighth aspects, optical black or low transmittance is provided between each LED chip on the substrate. Since the thin film formed of the material is adhered in a grid pattern, the contrast when each LED chip emits light can be enhanced, the crosstalk in which light leaks to an adjacent LED chip can be reduced, and when displaying, An LED array capable of improving the image quality of the LED array can be provided.

According to the display device of the tenth aspect of the present invention, in addition to the effect of any one of the first to ninth aspects,
An LED array capable of preventing reflection of red light, blue light, and green light and enhancing display contrast when each LED chip emits light can be provided.

According to the display device of the eleventh aspect of the present invention, it is possible to provide a display device having a small number of components and capable of forming a small-sized and high-density display pixel display device.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of an LED array according to a first embodiment of the present invention.

FIG. 2 is a plan view of a main part of an LED array according to a second embodiment of the present invention.

FIG. 3 is a plan view of a main part of an LED array according to a third embodiment of the present invention.

FIG. 4 is a plan view of a main part of an LED array according to a fourth embodiment of the present invention.

FIG. 5 is a plan view of a main part of an LED array according to a fifth embodiment of the present invention.

FIG. 6 is a cross-sectional view of a conventional general LED.

[Explanation of symbols]

 Reference Signs List 1 LED array 1a, 1b, 1c, 1d LED array 2 Blue LED chip 3 Green LED chip 4 Red LED chip 101 Sapphire substrate 102 n-GaN layer 103 n electrode 104 InGaN active layer 105 p-AlGaN layer 106 p- GaN layer 107 p-electrode 108 opaque layer 109 passing window 110 blue light 111 n-GaN layer 112 n-electrode 113 InGaN active layer 114 p-AlGaN layer 115 p-GaN layer 116 p-electrode 117 passing window 118 green light 119 holding substrate (holding) 120 n-AlGaInP layer 121 n-electrode 122 AlGaInP active layer 123 p-AlGaInP layer 124 p-electrode 125 opaque layer 126 passing window 127 red light 201 green LED chip 201a passing window 202 red LED chip Flop 202a passing window 203 blue LED chip 203a passes through the window 204 component 205 sapphire substrate 205a opaque layer 300 LED 301 LED chip 302 n electrode bonding wires 303 electrode 304 bonding wires 305 electrode 306 a transparent encapsulant

Claims (11)

[Claims] 1. An LED array in which red, blue, and green LED chips are regularly arranged on a substrate, wherein the substrate is formed of a light-transmitting material, and is disposed on a surface of the substrate. A green LED chip, a blue LED chip disposed on a surface of the substrate, and a blue LED chip disposed at a position where a path of emitted light and the path of emitted light do not overlap with each other; An LED array comprising: the green LED chip, the blue LED chip, and a red LED chip disposed at positions where emitted light paths do not overlap with each other. 2. The blue LED chip and the green LED
The LED array according to claim 1, wherein an ED chip is provided on a lower surface of the substrate. 3. The blue LED chip and the green LED chip.
The LED chip according to claim 2, wherein the ED chip is sealed with a translucent material. 4. The light emitting device according to claim 1, wherein the light transmitting material is sapphire.
ED chip. 5. The blue LED chip and the green LE
D chip and at least one of each of the red LED chips are arranged in close proximity to each other as one unit.
The LED array according to any one of claims 1 to 4, wherein the units are arranged linearly. 6. The linearly arranged LED chip row groups are respectively arranged substantially in parallel, and the blue LED chip, the green LED chip, and the red LED chip are:
The LED array according to claim 5, wherein the LED array is arranged in a plane. 7. The method according to claim 1, wherein each of said green LED chip, said blue LED chip and said red LED chip has a chip area corresponding to each luminous efficiency. The LED array according to claim 1. 8. A plurality of the green LED chips, the blue LED chips, and the red LED chips are arranged close to each other so as to have an area corresponding to each luminous efficiency. The LED array according to any one of claims 1 to 6, wherein 9. The apparatus according to claim 1, wherein the substrate is provided with a transmission window through which blue light, green light, and red light pass, formed in a lattice shape by a thin film made of optical black or a material having low transmittance. The LED array according to claim 1. 10. The light-emitting device according to claim 1, further comprising a light-shielding portion formed between the red LED chips in a lattice shape using a material made of a material made of optical black or a material having a low transmittance. The LED array according to claim 1. 11. An LED display device comprising the LED array according to any one of claims 1 to 10.