JP2002217454A - LED array and LED display device using the same - Google Patents

Abstract

(57) [Problem] To reduce the size of an LED display device in a full color display device using LEDs. An LED array includes a sapphire substrate.
A GaN blue LED and a GaN green LED are formed on the blue LED.
The red light 12 excited by the blue light 126 emitted by the ED
7 and a band-pass filter 123 that transmits red light 127.

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 and an LED using the same.
The present invention relates to a display device.

[0002]

2. Description of the Related Art Recently, a blue LE using a GaN semiconductor has been developed.
D has been developed, and an LED display device capable of full-color display has been produced in combination with a green LED and a red LED. FIG. 10 is a cross-sectional view showing a conventional LED,
In the figure, 301 is an LED chip, 302 is a bonding wire drawn out from an electrode, and 303 is an LED
Reference numeral 304 denotes a bonding wire drawn from the other electrode, reference numeral 305 denotes another electrode, and reference numeral 306 denotes a lens-shaped transparent sealing material.
Part of the light generated in the active layer of the LED chip 301 is reflected by the electrode 303 serving also as a reflecting mirror, and
Along with the light traveling from 01 to the front (upward on the plane of FIG. 10),
The lens-shaped transparent sealing material 306 is collected in front of the LED (upper side of the paper of FIG. 10) to efficiently emit light. However, since each LED is configured by a single-color LED, when configuring a full-color display device, a display device using current LEDs is configured by combining red, green, and blue LEDs, respectively. I have.

[0003]

SUMMARY OF THE INVENTION Such a monochromatic LED
Are combined to form a full-color display device, for example, a full-color television image device having about 480 pixels in height and 640 pixels in width, and the size of each LED is about 5 mm in diameter. , 4.8m in height and 6.8m in width
It is difficult to construct a small, full-color display device with a large screen.

An object of the present invention is to reduce the size of a display device in a full-color display device using LEDs.

[0005]

In the LED array of the present invention, a GaN blue LED is provided on the same sapphire substrate.
And a GaN green LED, comprising, on one of the blue LEDs, a phosphor that is excited by blue light emitted by the blue LED and emits red light, and a bandpass filter or a low-pass filter that transmits red light. It is a thing.

According to the present invention, since the light emitting portions of the three primary colors are formed on the same substrate, the size of the LED display device can be reduced.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 is a method of forming two GaN blue LEDs and a GaN blue LED on the same sapphire substrate.
A green LED, and one of the blue LEDs blue L
The ED is provided with a phosphor that emits red light when excited by the blue light emitted by the blue LED and a band-pass filter or a low-pass filter that transmits the red light, each of which has one red, green, and blue light source. On a single substrate.

According to a second aspect of the present invention, there are provided two GaN blue LEDs and two GaN green LEDs on the same sapphire substrate.
A phosphor that emits red light when excited by blue light emitted by the blue LED on the back side of the sapphire substrate where one of the blue LEDs is located,
A band-pass filter or a low-pass filter that transmits red light is arranged. Since the phosphor is on the back surface of the sapphire substrate, the phosphor can be arranged with good planarity and the thickness can be arranged with high accuracy. Further, even in a band-pass filter or a low-pass filter that transmits red light formed on a phosphor, the arrangement can be efficiently performed with good flatness.

According to a third aspect of the present invention, three GaN blue LEDs are formed on the same sapphire substrate, and one of the blue LEDs is excited by blue light emitted by the blue LED to emit red light. A phosphor that emits light,
A band-pass filter or a low-pass filter that transmits red light, and the blue L
It is provided with a phosphor that emits green light when excited by the blue light emitted by the ED, and a bandpass filter that transmits the green light. Red, green, and blue light sources can be configured on one substrate.

According to a fourth aspect of the present invention, three GaN blue LEDs are formed on the same sapphire substrate, and the blue LEDs are arranged on the back side of the sapphire substrate where one of the blue LEDs is located. A phosphor that emits red by being excited by the emitted blue light, and a bandpass filter or a low-pass filter that transmits red light, and the blue emitted by the blue LED on the back side of the sapphire substrate where another blue LED is located A phosphor that emits green light when excited by light and a band-pass filter that transmits green light are arranged. Since the phosphor is on the back surface of the sapphire substrate, it has good flatness and can be arranged efficiently. And the thickness can be accurately arranged. Further, even in a band-pass filter or a low-pass filter that transmits red light formed on a phosphor, the arrangement can be efficiently performed with good flatness.

According to a fifth aspect of the present invention, three GaN violet LEDs or ultraviolet LEDs are formed on the same sapphire substrate, and one of the LEDs is mounted on one violet LED or ultraviolet LED. A phosphor that emits red light when excited by the violet light or ultraviolet light emitted by the light LED, a bandpass filter or a low-pass filter that transmits the red light, and another violet LED or ultraviolet light LE
A phosphor that emits green light upon being excited by the purple light or ultraviolet light emitted by the purple LED or ultraviolet LED on D;
A band-pass filter that transmits green light, and a phosphor that emits blue light when excited by the violet light or ultraviolet light emitted by the violet LED or ultraviolet light LED on another violet LED or ultraviolet light LED; And a band-pass filter for transmitting light, and red, green, and blue light sources can be formed on a single substrate.

According to a sixth aspect of the present invention, three GaN purple LEDs or ultraviolet LEDs are formed on the same sapphire substrate, and one of the purple LEDs or ultraviolet LEDs is located on the back side of the sapphire substrate. A phosphor that emits red light when excited by the purple light or ultraviolet light emitted by the purple LED or ultraviolet LED, and a bandpass filter or a low-pass filter that transmits red light, and the other purple LED or ultraviolet LED On the back side of the sapphire substrate where the purple LED or ultraviolet LED emits green light excited by the violet light or ultraviolet light emitted by the purple LED or ultraviolet light, and a bandpass filter that transmits green light, and further another purple color The purple LED on the LED or ultraviolet LED
Alternatively, a fluorescent material that emits blue light when excited by ultraviolet light or ultraviolet light emitted by an ultraviolet LED, and a band-pass filter that transmits blue light are arranged. Since the fluorescent material is on the back surface of the sapphire substrate, the flatness is reduced. The arrangement can be performed effectively, and the thickness can be accurately arranged. Furthermore, a band filter or a low-pass filter that transmits red, green, and blue light that is formed on a phosphor has good flatness and can be efficiently formed.

[0013] The invention according to claim 7 is the invention according to claims 1 to 6.
The red LED, the blue LED, and the green LED are each a component of one combination, and the components are one-dimensionally arranged, so that full-color line display can be easily performed. Can be configured.

[0014] The invention according to claim 8 is the invention according to claims 1 to 6.
The red LED, the blue LED, and the green LED are each a component of one combination, and the components are two-dimensionally arranged, and a full-color area display is provided. Can be easily configured.

According to a ninth aspect of the present invention, when red light, green light, and blue light emitted from the constituent elements are combined as one, the chip area of each color LED is changed according to the luminous efficiency of each color. Yes, LED according to luminous efficiency of each color
When each component emits light by changing the area of the light emitting element, light emission close to white can be obtained.

According to a tenth aspect of the present invention, when the red light, green light, and blue light emitted by the constituent elements according to any one of the first to sixth aspects are combined as one, the luminous efficiency of each color is reduced. The area of each color phosphor is changed correspondingly, and by changing the area of the phosphor according to the luminous efficiency of each color, when each component emits light, light emission close to white can be obtained.

According to an eleventh aspect of the present invention, one pixel is configured by combining a plurality of the LED arrays according to any one of the first to sixth aspects, and the configuration described in any one of the first to sixth aspects is provided. When the combination of red light, green light, and blue light emitted by the element is one, the number of LEDs of each color included in the component is changed according to the luminous efficiency of each color, and according to the luminous efficiency of each color. L contained in the component
By changing the number of EDs, when each component emits light, light emission close to white can be obtained.

According to a twelfth aspect of the present invention, a conductor is provided between the light emitting chips on the sapphire substrate to serve as a common electrode, and the number of electrodes is reduced, and the conductive material is a metal having good heat conductivity. It has the function of improving the heat radiation effect by the body and reduces the light emission crosstalk between the LED chips.

According to a thirteenth aspect of the present invention, there are provided a blue LED and a green LED respectively formed on the sapphire substrate.
A material having an optical black or a material having a low light transmittance is disposed between the LEDs, and by using a material having an optical black or a material having a low light transmittance between the LEDs, when each LED emits light, another LED adjacent thereto is used. The crosstalk that excites the phosphor and emits light is reduced, and the display contrast is enhanced.

According to a fourteenth aspect of the present invention, there is provided a display device including the LED array according to any one of the first to fourteenth aspects, which is capable of forming a small-sized and high-density display pixel display device.

An embodiment of the present invention will be described below with reference to FIGS.

(Embodiment 1) FIG. 1 is a sectional view showing an LED array according to Embodiment 1 of the present invention. In FIG. 1, reference numeral 101 denotes a sapphire substrate as a base material; GaN layer, 103 is an n-electrode of a blue LED, 104 is an active layer of InGaN, 105 is p-AlG
An aN layer, 106 is a p-GaN layer, 107 is a p-electrode of a blue LED, and 108 is blue light extracted and emitted from the active layer 104 of the blue LED.

Reference numeral 109 denotes an n-GaN layer of a green LED;
10 is an n electrode of a green LED, 111 is an active layer of InGaN, 112 is a p-AlGaN layer, 113 is p-GaN
Layer, 114 is the p-electrode of the blue LED, 115 is the green LE
This is green light emitted and extracted by the D active layer 111.

Reference numeral 116 denotes a red phosphor; 117, an n-GaN layer of a blue LED for exciting the red phosphor 116;
Reference numeral 18 denotes an n electrode of the blue LED, 119 denotes an InGaN active layer of the blue LED, and 120 denotes p-Al of the blue LED.
GaN layer, 121 is p-GaN layer of the same blue LED, 12
Reference numeral 2 denotes a p-electrode of the blue LED.

Reference numeral 123 denotes a band-pass filter or a low-pass filter that passes red light, reference numeral 124 denotes a structure transparent to light supporting the phosphor and the filter, and reference numeral 125 denotes an opaque layer.
Reference numeral 26 denotes primary blue light that excites the red phosphor 116 emitted from the blue LED, and 127 denotes red light generated by the red phosphor 116 by the blue primary light and extracted through the filter 123 that transmits red. is there.

The blue light generated in the active layer 104 of the GaN blue LED is extracted outside through the window of the transparent structure 124. Similarly, the green light generated in the active layer 111 of the green LED is similar to the blue light. Through the window of the transparent structure 124.

On the other hand, another blue LED active layer 11
The blue light generated in 9 strikes the red phosphor 116 through the window of the transparent structure 124 and excites the phosphor 116. The red phosphor 116 excited by the blue light emits light in the red spectrum. With respect to the light emitted from the phosphor 116, only red in the emission spectrum is selected by a low-pass filter or band-pass filter 123 that transmits red light above the phosphor, passes through the filter, and is extracted.

With such a configuration, the band-pass filter 123 formed on the phosphor 116 prevents the excitation light blue from being directly consumed as blue without being consumed by the fluorescent light, and prevents the excitation light from being directly extracted as blue. Light of an extra wavelength included in the color can be prevented, and the color purity can be improved. In addition, when light having a wavelength shorter than red is incident from the outside, the bandpass filter 123 prevents the phosphor 116 from being erroneously excited by the external light and emitting fluorescence, thereby preventing a decrease in contrast. As described above, according to the present invention, it is possible to obtain red, blue, and green light with high color purity and high contrast by using an LED made of GaN formed on the same substrate. Further, according to the present invention, since three primary colors can be formed on one substrate, full-color display is possible and a small-sized display element can be manufactured.

(Embodiment 2) FIG. 2 is a sectional view of an LED array according to Embodiment 2 of the present invention.
The same reference numerals are given to the same components as those described above. The LED array shown in FIG. 2 has a configuration in which a phosphor is arranged on the back surface of the LED configuration surface of the sapphire substrate to extract light from the sapphire substrate side.

In FIG. 2, 128 is a red phosphor, 1
29 is a bandpass filter or a low-pass filter that passes red, 130 is a base material and a phosphor 128 constituting an LED, and a bandpass filter or a low-pass filter 1 that passes red.
A sapphire substrate also serving as a structure supporting 29, an n-GaN layer 102 of a blue LED, and an n-GaN layer 103 of a blue LED
Electrode, 104 is an InGaN active layer, 105 is p-Al
GaN layer, 106 is p-GaN layer, 107 is blue LED
P electrode 108 is blue light emitted and extracted by the active layer 104 of the blue LED.

Reference numeral 109 denotes an n-GaN layer of a green LED;
10 is an n electrode of a green LED, 111 is an active layer of InGaN, 112 is a p-AlGaN layer, 113 is p-GaN
Layer, 114 is the p-electrode of the blue LED, 115 is the green LE
This is green light emitted and extracted by the D active layer 111.

Reference numeral 117 denotes an n-GaN layer of a blue LED for exciting the red phosphor 128; 118, an n-electrode of the blue LED; 119, an InGaN active layer of the blue LED;
0 is a p-AlGaN layer of the blue LED, 121 is a p-GaN layer of the blue LED, and 122 is a p-electrode of the blue LED.

125 is an opaque layer, and 126 is blue L
Blue primary light 127 emitted from the ED to excite the red phosphor 128 is red light generated by the red phosphor by the blue primary light and extracted through the filter 129 that transmits red.

The blue light generated in the active layer 104 of the GaN blue LED is extracted outside through the window of the transparent sapphire substrate 130. Also, similarly, the active layer 1 of the green LED
The green light generated at 11 is also extracted through the window of the transparent sapphire substrate 130 like the blue light.

On the other hand, another blue LED active layer 11
The blue light generated at 9 passes through the window of the transparent sapphire substrate 130 and strikes the red phosphor 128, and the phosphor 128
To excite. The red phosphor 128 excited by the blue light emits light in the red spectrum. With respect to the light emitted from the phosphor 128, only red in the emission spectrum is selected by a low-pass filter or a band-pass filter 129 that transmits red, which is located above the phosphor, and passes through the filter to be extracted.

With this configuration, the band-pass filter 129 formed on the phosphor 128 prevents the excitation light blue from being directly consumed as blue without being consumed by the fluorescent light, and prevents the excitation light from being directly extracted as blue. Light of an extra wavelength included in the light can be blocked, and the color purity can be improved. Also from outside
When light having a wavelength shorter than red is incident, it is prevented by the bandpass filter 129 that the fluorescent material 128 is erroneously excited by external light and emits fluorescence, and a decrease in contrast can be prevented.

According to the LED array of the present embodiment, the LEDs made of GaN formed on the same substrate have high color purity and high contrast, red and blue colors.
Green emission can be obtained. Further, since three primary colors can be formed on one substrate, full-color display can be performed, and a small-sized display element can be manufactured.

Further, as in the second, fourth and sixth aspects of the present invention, the phosphor and the red band-pass filter are arranged on the back surface of the sapphire substrate 130 opposite to the side on which the LEDs are formed, and are passed through the sapphire substrate. By adopting a configuration for extracting light, the transparent structure 124 supporting the phosphor in FIG. 1 becomes unnecessary, and the surface constituting the phosphor and the bandpass filter is the surface of the sapphire substrate 130, so that the smoothness is improved. In addition, the thickness of the phosphor can be made uniform, and the production becomes simple.

Also, an LED that emits light for exciting the phosphor
When a plurality of LEDs are formed on the same substrate, excitation from adjacent LEDs is reduced, and crosstalk can be reduced.

(Embodiment 3) FIG. 3 is a sectional view showing an LED array according to Embodiment 3 of the present invention. In FIG. 3, 128 is a red phosphor, and 129 is a bandpass filter or a bandpass filter which passes red. Low-pass filter, 131 is a green phosphor, 132 is a bandpass filter that passes green, 130
Is a band-pass filter or a low-pass filter 12 that passes through the base material constituting the LED, the phosphors 128 and 131, and red.
9 and a sapphire substrate that also serves as a structure supporting a band-pass filter 132 that passes green.
GaN layer, 103 is n-electrode of blue LED, 104 is In
An active layer of GaN, 105 is a p-AlGaN layer, 106 is a p-GaN layer, 107 is a p-electrode of a blue LED, and 108 is blue light emitted and extracted from the active layer 104 of the blue LED.

133 is an n-GaN layer of a blue LED for exciting the green phosphor 131; 134 is an n electrode of the blue LED; 135 is an InGaN active layer of the blue LED;
6 is a p-AlGaN layer of the blue LED, 137 is a p-GaN layer of the blue LED, and 138 is a p-electrode of the blue LED.

125 is an opaque layer, and 139 is blue L
The blue primary light 140 that excites the green phosphor 131 emitted from the ED, and 140 is the green phosphor 1 by the blue primary light 139
Green light generated at 31 and extracted through a filter 132 that transmits green light.

Reference numeral 117 denotes an n-GaN layer of a blue LED for exciting the red phosphor 128; 118, an n electrode of the blue LED; 119, an InGaN active layer of the blue LED;
0 is a p-AlGaN layer of the blue LED, 121 is a p-GaN layer of the blue LED, and 122 is a p-electrode of the blue LED.

As described above, 125 is an opaque layer.
Reference numeral 126 denotes blue primary light that excites the red phosphor 128 emitted from the blue LED, and 127 denotes red light generated by the red phosphor 128 by the blue primary light 126 and extracted through the filter 129 that transmits red. It is.

The blue light generated in the active layer 104 of the GaN blue LED is extracted to the outside through the window of the transparent sapphire substrate 130, and the active layer 134 of another blue LED is emitted.
The blue light generated in step (1) hits the green phosphor 131 through the window of the transparent sapphire substrate 130, and excites the phosphor 131. Green phosphor 1 excited by blue light
31 emits light in the green spectrum. With respect to the light emitted from the phosphor 131, only green in the emission spectrum is selected by the band-pass filter 132 that transmits the green light and is extracted through the filter.

With such a configuration, the band-pass filter 132 formed on the phosphor 131 prevents the blue light, which is the excitation light, from being directly consumed without being consumed by the fluorescent light, and prevents the blue light as the excitation light from being directly extracted. Can be blocked, and the color purity can be improved.

When light having a wavelength shorter than that of green light enters from the outside, the bandpass filter 132 prevents the phosphor 131 from being erroneously excited by the outside light and emitting fluorescence, thereby preventing a decrease in contrast.

On the other hand, another blue LED active layer 11
The blue light generated at 9 passes through the window of the transparent sapphire substrate 130 and strikes the red phosphor 128, and the phosphor 128
To excite. The red phosphor 128 excited by the blue light emits light in the red spectrum. Phosphor 128
In the light emitted in step (1), only red in the emission spectrum is selected by the low-pass filter or band-pass filter 129 that transmits red, which is located above the phosphor, and is extracted through the filter.

As described above, the band-pass filter 129 formed on the phosphor 128 prevents the blue of the excitation light from being directly extracted without being consumed by the fluorescent light, and has a wavelength outside the band included in the fluorescent light. Light can be blocked, and color purity can be improved. Also, when light having a wavelength shorter than red is incident from the outside, the fluorescent light
Is prevented from being excited and emits fluorescence by the bandpass filter 129, and a decrease in contrast can be prevented.

In the LED array of the present embodiment,
By configuring only blue LEDs on the same substrate,
It is possible to obtain red, blue, and green light with high color purity and good contrast. Further, since three primary colors can be formed on one substrate, full-color display can be performed, and a small-sized display element can be manufactured. The effect of disposing the phosphor and the color band-pass filter on the back surface of the sapphire substrate will not be described because it has been described in the second embodiment.
In the LED array of the present embodiment, the arrangement of the phosphors is the same as that of FIG.
Since the configuration is the same as that described above, description thereof will be omitted.

(Embodiment 4) FIG. 4 is a sectional view showing an LED array according to Embodiment 4 of the present invention. In the same figure, 128 is a red phosphor, and 129 is a bandpass filter or a red-pass filter. Low-pass filter, 131 is a green phosphor, 132 is a band-pass filter that passes green, 141
Is a blue phosphor, 142 is a bandpass filter that passes blue, 130 is the base material and phosphors 128, 1
31, 141 and a band-pass filter or low-pass filter 129 passing red and a band-pass filter 1 passing green.
32, a sapphire substrate also serving as a structure supporting a bandpass filter 142 that passes blue, 143 is an n-GaN layer of an LED that emits purple or ultraviolet light, 144 is an n electrode of an LED that emits purple or ultraviolet light, and 145 is InGaN. 146 is a p-AlGaN layer and 147 is a p-GaN
Layer 148 is a p-electrode of an LED that emits purple or ultraviolet light,
Reference numeral 149 denotes primary light of purple or ultraviolet light which is emitted from the active layer 145 of the purple or ultraviolet LED and excites the blue phosphor 141 emitted from the purple or ultraviolet LED, and 150 is a primary light 149 of purple or ultraviolet light. This is blue light generated by the blue phosphor and extracted through the filter 142 that transmits blue.

Reference numeral 151 denotes an n-GaN layer of a purple or ultraviolet LED for exciting the green phosphor 131; 152, an n electrode of the purple or ultraviolet LED; 153, a purple or ultraviolet LE;
D of InGaN active layer, 154 is the same purple or ultraviolet light L
ED p-AlGaN layer, 155 is the same purple or ultraviolet light L
ED p-GaN layer, 156 is the same purple or ultraviolet LED
Is the p-electrode. Reference numeral 125 denotes an opaque layer, reference numeral 157 denotes violet or ultraviolet primary light for exciting the green phosphor 131 emitted from the violet or ultraviolet LED, and reference numeral 140 denotes green fluorescent light by the violet or ultraviolet primary light 157. Occur in the body,
This is green light extracted through a filter 132 that transmits green.

Reference numeral 158 denotes an n-GaN layer of a violet or ultraviolet LED for exciting the red phosphor 128, 159 denotes an n-electrode of the violet or ultraviolet LED, and 160 denotes an violet or ultraviolet LE.
D is an active layer of InGaN, and 161 is the same purple or ultraviolet light L.
ED p-AlGaN layer, 162 is the same purple or ultraviolet light L
ED p-GaN layer, 163 is the same purple or ultraviolet LED
Is the p-electrode. Reference numeral 125 denotes an opaque layer, reference numeral 164 denotes purple or ultraviolet primary light for exciting the red phosphor 128 emitted from the purple or ultraviolet LED, and reference numeral 127 denotes blue 1
This is red light that is excited by the next light 164, is generated by the red phosphor, and is extracted through the filter 129 that transmits red.

The violet or ultraviolet light generated in the active layer 145 of the violet or ultraviolet LED is applied to the transparent sapphire substrate 13.
The blue phosphor 141 through the window 0, and the phosphor 1
Excite 41. The blue phosphor 141 excited by the violet or ultraviolet light emits light having a blue spectrum. In the light emitted from the phosphor 141, only blue in the emission spectrum is selected by the band-pass filter 142 that transmits blue light above the phosphor, passes through the filter, and is extracted.

With this configuration, the bandpass filter 142 formed on the phosphor 141 prevents the violet or ultraviolet light of the excitation light from being directly extracted without being consumed by the fluorescent light, and the fluorescent light from the fluorescent light. Light of an out-of-band wavelength included in the light can be blocked, and the color purity can be improved. Further, when light having a wavelength shorter than that of blue is incident from the outside, the bandpass filter 142 can prevent the fluorescent material 141 from being erroneously excited by the external light to emit fluorescence, thereby preventing a decrease in contrast.

The violet light or ultraviolet light generated in the active layer 153 of another violet or ultraviolet LED hits the green phosphor 131 through the window of the transparent sapphire substrate 130 and excites the phosphor 131. The green phosphor 131 excited by violet light or ultraviolet light emits light of a green spectrum. In the light emitted from the phosphor 131, only green in the emission spectrum is selected by the band-pass filter 132 that transmits the green and is located above the phosphor, passes through the filter, and is extracted.

With such a configuration, the band-pass filter 132 formed on the phosphor 131 prevents the violet or ultraviolet light of the excitation light from being directly extracted without being consumed by the fluorescent light, and prevents the excitation light from being emitted. Can be blocked, and the color purity can be improved. Also, from outside
When light having a wavelength shorter than green is incident, it is prevented by the bandpass filter 132 that the fluorescent material 131 is erroneously excited by external light and emits fluorescence, thereby preventing a decrease in contrast.

Further, another purple or ultraviolet LED
The ultraviolet light or ultraviolet light generated in the active layer 160 of FIG. 1 hits the red phosphor 128 through the window of the transparent sapphire substrate 130 and excites the phosphor 128. The red phosphor 128 excited by violet light or ultraviolet light emits light of a red spectrum. The light emitted from the phosphor 128 is the phosphor 12
Only the red color in the emission spectrum is selected by a low-pass filter or band-pass filter 129 that transmits red color at the upper part of 8, and passes through the filter and is extracted.

With such a configuration, the bandpass filter 129 formed on the phosphor 128 prevents the violet or ultraviolet light of the excitation light from being directly taken out without being consumed by the fluorescent light, and prevents the excitation light from being emitted. , Light having a wavelength outside the band included in the color filter can be blocked, and the color purity can be improved. Further, when light having a wavelength shorter than red is incident from the outside, the bandpass filter 129 can prevent the fluorescent material 128 from being erroneously excited by the external light and emitting fluorescence, thereby preventing a decrease in contrast.

As described above, in the LED array of the present embodiment, by forming only the violet or ultraviolet LED on the same substrate, red, blue, and green light with high color purity and good contrast can be obtained. It becomes possible. Also,
Since three primary colors can be formed on one substrate, full-color display is possible and a small-sized display element can be manufactured. The effect when the phosphor and the color bandpass filter are formed on the sapphire substrate has been described in the second embodiment, and thus the description thereof is omitted. In the LED array according to the present embodiment, the arrangement of the phosphors is the same as in FIG. 1 and the combination of the LED and the phosphor is the same as in FIG.

(Embodiment 5) FIG. 5 is a plan view showing an LED display device according to Embodiment 5 of the present invention, and emits green light as described with reference to FIGS. 1, 2, 3 and 4. , An LED 202 that emits blue light,
One set of the LEDs 203 that can obtain red light emission is shown as a combination 204, and the combination 204 of the three LEDs is one.
And the substrate 20 along the direction of the arrow 206.
5, the full-color one-dimensional display element can be easily configured with a small number of components.

(Embodiment 6) FIG. 6 is a plan view showing an LED display device according to Embodiment 6 of the present invention, in which the green color shown in FIG. 1, FIG. 2, FIG. 3, and FIG. LED 211 that can emit light, LED 212 that can emit blue light,
The combination 214 of the LEDs 213 that can emit red light is one component, and the combination 214 is
5, a full-color two-dimensional display element can be easily formed with a small number of components by arranging two-dimensionally on the X direction of 216 and the Y direction of 217. On a single substrate.

(Embodiment 7) FIG. 7 is a plan view showing an LED display device according to Embodiment 7 of the present invention. In this LED display device, the area of the green LED 211 that emits green light with high visibility is small, and the areas of the blue LED 212 and the red LED 213 are large.
By changing the chip area of 2,213 in accordance with each color, a full-color two-dimensional display element whose emission color is close to white can be obtained. In addition, white balance can be easily adjusted in image display and the like, and each LED 211, 21
When an image is displayed by pulse lighting of 2,213, it is not necessary to secure a margin for the duty ratio for white balance adjustment, and the dynamic range of drive timing can be widened.

(Eighth Embodiment) FIG. 8 is a plan view showing an LED display device according to an eighth embodiment of the present invention. Each L
By changing the phosphor areas of the EDs 211, 212, and 213 in accordance with the respective colors, a full-color two-dimensional display element whose emission color is close to white can be obtained. Can be widely taken.

(Embodiment 9) FIG. 9 is a plan view showing an LED display device according to Embodiment 9 of the present invention. Each L
By changing the number of chips of the EDs 211, 212, and 213 according to the respective colors, a full-color two-dimensional display element in which the color at the time of light emission is close to white can be obtained. The range can be widened.

On the other hand, in FIG. 4, the electrode 165 of the LED can be used as a common electrode of each LED, and by forming the common electrode between the chips, the electrodes can be broadly formed in a mesh-like manner. You can lower the value. By lowering the resistance of the electrode 165, the electrode 16
5 can be reduced, and the temperature rise around the LED chip can be reduced. Further, opacity of the electrode 165 with respect to light can reduce light leakage between chips, and can reduce crosstalk of light when the chip is turned on.

As described in FIG. 5, FIG. 6, FIG. 7, FIG. 8 and FIG.
By modulating the drive current of D with a video signal or the like, an LED display device that is small, lightweight, has high resolution, and has high power efficiency can be easily configured.

[0068]

According to the first aspect of the present invention, red, green,
A blue light source can be formed on one substrate.

According to the second aspect of the present invention, the flatness is good, the layout can be performed efficiently, and the thickness can be precisely arranged.

According to the third aspect of the present invention, red, green,
A blue light source can be formed on one substrate.

According to the fourth aspect of the invention, the flatness is good, the arrangement can be performed efficiently, and the thickness can be arranged with high accuracy.

According to the fifth aspect of the invention, the red, green, and blue light sources can be formed on one substrate.

According to the invention described in claim 6, the flatness is good, the arrangement can be performed efficiently, and the thickness can be arranged with high accuracy.

According to the seventh aspect of the invention, full-color line display can be easily configured.

According to the present invention, a full-color area display can be easily configured.

According to the ninth aspect of the present invention, when each component emits light, a light emission close to white can be obtained.

According to the tenth aspect, when each of the constituent elements emits light, light emission close to white is obtained.

According to the eleventh aspect, when each component emits light, light emission close to white is obtained.

According to the twelfth aspect, the number of electrodes can be reduced, the heat radiation effect can be improved, and the crosstalk of light emission between LED chips can be reduced.

According to the thirteenth aspect of the present invention, each LE
When D emits light, crosstalk for exciting the phosphor of another adjacent LED to emit light is reduced, and display contrast can be enhanced.

According to the fourteenth aspect of the present invention, it is possible to configure a display device having small and high-density display pixels.

[Brief description of the drawings]

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

FIG. 2 is a sectional view showing an LED array according to a second embodiment of the present invention;

FIG. 3 is a sectional view showing an LED array according to a third embodiment of the present invention;

FIG. 4 is a sectional view showing an LED array according to a fourth embodiment of the present invention.

FIG. 5 is a plan view showing an LED display device according to a fifth embodiment of the present invention.

FIG. 6 is a plan view showing an LED display device according to a sixth embodiment of the present invention.

FIG. 7 is a plan view showing an LED display device according to a seventh embodiment of the present invention.

FIG. 8 is a plan view showing an LED display device according to an eighth embodiment of the present invention.

FIG. 9 is a plan view showing an LED display device according to a ninth embodiment of the present invention.

FIG. 10 is a sectional view showing a conventional LED.

[Explanation of symbols]

Reference Signs List 101 sapphire substrate 102 blue LED n-GaN layer 103 blue LED n electrode 104 InGaN active layer 105 p-AlGaN layer 106 p-GaN layer 107 blue LED p electrode 108 blue light 109 green LED n- GaN layer 110 n-electrode of green LED 111 active layer of InGaN 112 p-AlGaN layer 113 p-GaN layer 114 p-electrode of blue LED 115 green light 116 red phosphor 117 n-GaN layer of LED 118 n-electrode 119 InGaN of InGaN Active layer 120 p-AlGaN layer 121 p-GaN layer 122 p-electrode 123 band-pass filter or low-pass filter that passes red 124 transparent structure 125 opaque layer 126 blue primary light 127 red light 128 red phosphor 129 red Band passing through Filter or low-pass filter 130 sapphire substrate 131 green phosphor 132 bandpass filter that passes green 133 n-GaN layer 134 n-electrode 135 active layer of InGaN 136 p-AlGaN layer 137 p-GaN layer 138 p-electrode 139 blue primary Light 140 green light 141 blue phosphor 142 blue bandpass filter 143 n-GaN layer 144 n electrode 145 InGaN active layer 146 p-AlGaN layer 147 p-GaN layer 148 p electrode 149 purple or ultraviolet light 1 Secondary light 150 Blue light 151 n-GaN layer 152 n-electrode 153 InGaN active layer 154 p-AlGaN layer 155 p-GaN layer 156 p-electrode 157 Purple or ultraviolet primary light 158 n-GaN layer 159 n-electrode 160 InGaN active layer 1 1 p-AlGaN layer 162 p-GaN layer 163 p-electrode 165 electrode 201 green LED 202 red LED 203 blue LED 204 combination of three LEDs 205 substrate 206 sign indicating direction 211 green LED 212 red LED 213 blue LED 214 three LEDs 215 Substrate 216 Symbol indicating direction 217 Symbol indicating direction

Claims (14)

[Claims] 1. A blue LED comprising two GaN blue LEDs and a GaN green LED on the same sapphire substrate.
An LED array, comprising: a blue LED that emits red light when excited by blue light emitted by the blue LED, and a band-pass filter or a low-pass filter that transmits red light. 2. A blue LED comprising two GaN blue LEDs and a GaN green LED on the same sapphire substrate.
A phosphor that emits red light when excited by the blue light emitted by the blue LED and a band-pass filter or a low-pass filter that transmits the red light, on the back side of the sapphire substrate where one of the blue LEDs is located. LED array. 3. Three GaN blue LEDs are formed on the same sapphire substrate, and one of the blue LEDs is a blue LED.
A phosphor that emits red light when excited by the blue light emitted by the blue LED on the ED, and a bandpass filter or a low-pass filter that transmits red light, and the blue LED emits on another blue LED An LED array comprising: a phosphor that emits green light when excited by blue light; and a bandpass filter that transmits green light. 4. Three GaN blue LEDs are formed on the same sapphire substrate, and one of the blue LEDs is a blue LED.
The blue L on the back side of the sapphire substrate where the ED is located
The ED is provided with a phosphor that emits red light by being excited by the blue light emitted by the ED, and a band-pass filter or a low-pass filter that transmits the red light. An LED array comprising: a phosphor that emits green light when excited by blue light; and a bandpass filter that transmits green light. 5. Three GaN purple LEDs or ultraviolet LEDs are formed on the same sapphire substrate, and one of the LEDs is arranged on one purple LED or ultraviolet LED.
Or a phosphor that emits red light when excited by ultraviolet light or ultraviolet light emitted by an ultraviolet LED, and a bandpass filter or a low-pass filter that transmits red light, and another purple LED or an ultraviolet LED on the ultraviolet LED. It is provided with a phosphor that emits green light excited by ultraviolet light or ultraviolet light emitted by the LED or ultraviolet LED, and a band-pass filter that transmits green light, and further includes another purple LED or ultraviolet light L.
What is claimed is: 1. An LED array comprising, on an ED, a phosphor that emits blue light when excited by violet light or ultraviolet light emitted by the violet LED or ultraviolet LED, and a bandpass filter that transmits blue light. 6. A three-GaN violet LED or an ultraviolet LED on the same sapphire substrate, and the violet LED or the ultraviolet LED is located on the back side of the sapphire substrate where one of the violet LED or the ultraviolet LED is located. A phosphor that emits red light when excited by the violet light or ultraviolet light emitted by the device, and a band-pass filter or a low-pass filter that transmits the red light, and the other one of the purple LED or the ultraviolet light L
The purple LE on the back side of the sapphire substrate where the ED is located
D or a phosphor that emits green light excited by ultraviolet light or ultraviolet light emitted by an ultraviolet LED, and a bandpass filter that transmits green light, and the purple LED or ultraviolet LED on another purple LED or ultraviolet LED An LED array comprising a violet light emitted by an ultraviolet LED or a phosphor that emits blue light when excited by ultraviolet light, and a bandpass filter that transmits the blue light. 7. An LED according to claim 1, wherein:
It consists of an array, each with a red LED, a blue LED,
An LED array comprising a green LED as one combination of components, and the components are arranged one-dimensionally. 8. An LED according to claim 1,
It consists of an array, each with a red LED, a blue LED,
An LED characterized in that a green LED is a component of one combination and the components are two-dimensionally arranged.
Array. 9. The device according to claim 1, wherein, when red light, green light, and blue light emitted from the constituent elements are combined into one, the chip area of each color LED is changed according to the luminous efficiency of each color. 7. The LED array according to any one of 6. 10. The area of each color phosphor according to the luminous efficiency of each color when the combination of the red light, green light and blue light emitted by the constituent elements according to any one of claims 1 to 6 is made. The LED array according to any one of claims 1 to 8, wherein 11. The LE according to claim 1, wherein:
7. A single pixel is formed by combining a plurality of D arrays, and when the red light, green light, and blue light emitted by the constituent elements according to claim 1 are combined as one, the luminous efficiency of each color is obtained. 2. The number of LEDs of each color included in a component is changed according to
0. The LED array according to any one of 0. 12. The LED array according to claim 1, wherein a conductor is provided between the light emitting chips on the sapphire substrate to form a common electrode. 13. The sapphire substrate according to claim 1, wherein a material having an optical black or a low light transmittance is disposed between the blue LED and the green LED, respectively. LED array. 14. L according to any one of claims 1 to 14,
An LED display device comprising an ED array.