TWI703722B - Light emitting device - Google Patents

Abstract

A light emitting device includes a first light emitting element layer, a second light emitting element layer, and a third light emitting element layer. The first light emitting element layer has a plurality of red light emitting devices. The second light emitting element layer is disposed on a light emitting surface of the first light emitting element layer and has a plurality of green light emitting devices. The third light emitting element layer is disposed on a light emitting surface of the second light emitting element layer and has a plurality of blue light emitting devices. The green light emitting devices are correspondingly disposed on the red light emitting devices. The blue light emitting devices are correspondingly disposed on the green light emitting devices.

Description

Light-emitting device

The present invention relates to a light emitting device, and more particularly to a light emitting device including a first light emitting element layer, a second light emitting element layer, and a third light emitting element layer.

The light-emitting diode is a kind of electroluminescent semiconductor element, which has the advantages of high efficiency, long life, not easy to be damaged, fast reaction speed, and high reliability. With the investment of a lot of time and money, the size of light-emitting diodes has been reduced year by year. However, it is still difficult to use light-emitting diodes in the pixel structure of light-emitting devices, especially when a single pixel has a red color. In the light-emitting device of pixel, green sub-pixel, and blue sub-pixel, the size of a single sub-pixel is very small, whether it is manufacturing light-emitting diodes that conform to small-size sub-pixels or transposing the light-emitting device Diodes have the problem of low process yield. Therefore, there is an urgent need for a method to solve the aforementioned problems.

The invention provides a light-emitting device with a light-emitting diode, which can improve the problem of insufficient production yield.

A light-emitting device of the present invention includes a first light-emitting element layer, a second light-emitting element layer, and a third light-emitting element layer. The first light-emitting element layer has a plurality of red light-emitting elements. The second light-emitting element layer is located on the light-emitting surface of the first light-emitting element layer and has a plurality of green light-emitting elements. The third light-emitting element layer is located on the light-emitting surface of the second light-emitting element layer and has a plurality of blue light-emitting elements. The green light-emitting element is correspondingly arranged on the red light-emitting element, and the blue light-emitting element is correspondingly arranged on the green light-emitting element.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail in conjunction with the accompanying drawings.

FIG. 1 is an exploded schematic diagram of a light emitting device according to an embodiment of the invention. Fig. 2 is a schematic cross-sectional view taken along line 11' of Fig. 1.

1 and 2, the light-emitting device 10 includes a first light-emitting element layer 100, a second light-emitting element layer 200, and a third light-emitting element layer 300.

The first light-emitting element layer 100 has a back surface B1 and a light-emitting surface F1 opposite to the back surface B1. The first light emitting element layer 100 has a first substrate 110 and a plurality of red light emitting elements R on the first substrate 110. The red light-emitting element R emits light with directivity, and the light emitted by the red light-emitting element R leaves the first light-emitting element layer 100 from the light-emitting surface F1.

In this embodiment, the red light-emitting element R includes a first light-emitting diode 122 and a packaging material 124 surrounding the first light-emitting diode 122. The packaging material 124 is, for example, a red fluorescent material or a red phosphorescent material. In this embodiment, the first light emitting diode 122 is an inorganic light emitting diode (for example, an inorganic blue light emitting diode or an inorganic white light emitting diode), but the invention is not limited to this. In other embodiments, the red light-emitting element R is an organic red light-emitting diode.

In this embodiment, each red light-emitting element R has a corresponding drive circuit (not shown). In other words, each red light-emitting element R on the first light-emitting element layer 100 can be individually switched.

The second light emitting element layer 200 has a back surface B2 and a light emitting surface F2 opposite to the back surface B2. The second light-emitting element layer 200 is located on the light-emitting surface F1 of the first light-emitting element layer 100. It can also be said that the back surface B2 of the second light-emitting element layer 200 faces the light-emitting surface F1 of the first light-emitting element layer 100. The second light emitting element layer 200 has a second substrate 210 and a plurality of green light emitting elements G on the second substrate 210. The green light-emitting element G emits directional light, and the light emitted by the green light-emitting element G leaves the second light-emitting element layer 200 from the light-emitting surface F2.

In this embodiment, each green light emitting element G has a corresponding driving circuit (not shown). In other words, each green light emitting element G on the second light emitting element layer 200 can be individually switched.

In this embodiment, the green light-emitting element G includes a second light-emitting diode 222 and a packaging material 224 surrounding the second light-emitting diode 222. The packaging material 224 is, for example, a green fluorescent material or a green phosphorescent material. In this embodiment, the second light-emitting diode 222 is an inorganic light-emitting diode (for example, an inorganic blue light-emitting diode or an inorganic white light-emitting diode), but the invention is not limited to this. In other embodiments, the green light-emitting element G is an organic green light-emitting diode.

The third light-emitting element layer 300 has a back surface B3 and a light-emitting surface F3 opposite to the back surface B3. The third light-emitting element layer 300 is located on the light-emitting surface F2 of the second light-emitting element layer 200. It can also be said that the back surface B3 of the third light-emitting element layer 300 faces the light-emitting surface F2 of the second light-emitting element layer 200. The third light-emitting element layer 300 has a third substrate 310 and a plurality of blue light-emitting elements B on the third substrate 310. The blue light-emitting element B emits directional light, and the light emitted by the blue light-emitting element B leaves the third light-emitting element layer 300 from the light-emitting surface F3.

In this embodiment, the blue light-emitting element B includes a third light-emitting diode 322 and a packaging material 324 surrounding the third light-emitting diode 322. The packaging material 324 is, for example, a transparent packaging material, a blue fluorescent material or a blue phosphorescent material. In this embodiment, the third light-emitting diode 322 is an inorganic light-emitting diode (for example, an inorganic blue light-emitting diode or an inorganic white light-emitting diode), but the invention is not limited thereto. In other embodiments, the blue light-emitting element B is an organic blue light-emitting diode.

In this embodiment, each blue light-emitting element B has a corresponding driving circuit (not shown). In other words, each blue light-emitting element B on the third light-emitting element layer 300 can be individually switched.

In this embodiment, the green light-emitting element G is correspondingly arranged on the red light-emitting element R, and the blue light-emitting element B is correspondingly arranged on the green light-emitting element G. The red light RL emitted by the red light-emitting element R may pass through the second light-emitting element layer 200 and the third light-emitting element layer 300, and be mixed with the green light GL emitted by the green light-emitting element G and/or the blue light BL emitted by the blue light-emitting element B . The green light GL emitted by the green light emitting element G may pass through the third light emitting element layer 300 and be mixed with the blue light BL emitted by the blue light emitting element B.

In this embodiment, a red light-emitting element R, a green light-emitting element G corresponding to the red light-emitting element R, and a blue light-emitting element B corresponding to the red light-emitting element R collectively form a light-emitting unit U. In this embodiment, the red light emitting element R at least partially overlaps the corresponding green light emitting element G, and the red light emitting element R at least partially overlaps the corresponding blue light emitting element B. In this embodiment, the red light emitting element R, the green light emitting element G, and the blue light emitting element have the same size. In some embodiments, the size of the red light emitting element R, the green light emitting element G, and the blue light emitting element is less than 200 microns. For example, the red light emitting element R, the green light emitting element G, and the blue light emitting element may be 100 microns in size. ~200 micron sub-millimeter light-emitting diode (Mini LED), it can also be a micro light-emitting diode (Micro LED) less than 100 microns or less than 30 microns in size.

When one of the light emitting units U of the light emitting device 10 is to emit red light RL, one of the red light emitting elements R is turned on, and the green light emitting element G corresponding to the red light emitting element R and the blue light emitting element R corresponding to the red light emitting element R are turned off. The color light-emitting element B is shown in the light-emitting unit U1.

When one of the light-emitting units U of the light-emitting device 10 is to emit green light GL, one of the green light-emitting elements G is turned on, and the red light-emitting element R corresponding to the green light-emitting element G and the blue light-emitting element G corresponding to the green light-emitting element G are turned off. The color light emitting element B is shown as the light emitting unit U2.

When one of the light-emitting units U of the light-emitting device 10 is to emit blue light GL, one of the blue light-emitting elements B is turned on, and the red light-emitting element R corresponding to the blue light-emitting element B and the blue light-emitting element B are turned off The green light-emitting element G is shown in the light-emitting unit U3.

When one of the light emitting units U of the light emitting device 10 is to emit cyan light, one of the green light emitting elements G and the blue light emitting element B corresponding to the green light emitting element G are turned on, and the red light corresponding to the green light emitting element G is turned off Light-emitting element R. As shown in the light-emitting unit U4, the green light GL emitted by the green light-emitting element G and the blue light BL emitted by the corresponding blue light-emitting element B are mixed into cyan light.

To make one of the light-emitting units U of the light-emitting device 10 emit magenta light (purple light), turn on one of the red light-emitting elements R and the blue light-emitting element B corresponding to the red light-emitting element R, and turn off the red light-emitting element R The corresponding green light-emitting element G. As shown in the light-emitting unit U5, the red light RL emitted by the red light-emitting element R and the blue light BL emitted by the corresponding blue light-emitting element B are mixed into magenta light.

To make one of the light-emitting units U of the light-emitting device 10 emit yellow light, turn on one of the red light-emitting elements R and the green light-emitting element G corresponding to the red light-emitting element R, and turn off the blue light-emitting element corresponding to the red light-emitting element R B. As shown in the light-emitting unit U6, the red light RL emitted by the red light-emitting element R and the green light GL emitted by the corresponding green light-emitting element G are mixed into yellow light.

When one of the light emitting units U of the light emitting device 10 is to emit white light, one of the red light emitting elements R, the green light emitting element G corresponding to the red light emitting element R, and the blue light emitting element B corresponding to the red light emitting element R are turned on . As shown in the light-emitting unit U7, the red light RL emitted by the red light-emitting element R will be mixed with the green light GL emitted by the corresponding green light-emitting element G and the blue light BL emitted by the corresponding blue light-emitting element B into white light. .

When one of the light-emitting units U of the light-emitting device 10 does not emit light, turn off one of the red light-emitting elements R, the green light-emitting element G corresponding to the red light-emitting element R, and the blue light-emitting element B corresponding to the red light-emitting element R . As shown in the light-emitting unit U8.

By disposing the red light-emitting element R, the green light-emitting element G, and the blue light-emitting element B on different light-emitting element layers, the resolution of the light-emitting device 10 can be improved and the manufacturing process difficulty of the light-emitting device 10 can be reduced, thereby improving the production of the display device 10 Insufficient yield.

In this embodiment, since the wavelength of the red light RL<the wavelength of the green light GL<the wavelength of the blue BL, the red light RL is less likely to excite the green light-emitting element G and the blue light-emitting element B, and the green light-emitting element G is more It is difficult to excite the blue light-emitting element B.

Based on the above, disposing the green light-emitting element G on the red light-emitting element R and disposing the blue light-emitting element B on the green light-emitting element G can avoid the first light-emitting element layer 100, the second light-emitting element layer 200, and the third light-emitting element. The component layers 300 interfere with each other. For example, when one of the red light-emitting elements R is turned on and the green light-emitting element G and/or the blue light-emitting element B corresponding to the red light-emitting element R is turned off, the red light RL emitted by the red light-emitting element R is not It is easy to excite the corresponding green light-emitting element G and/or blue light-emitting element B; when one of the green light-emitting elements G is turned on and the blue light-emitting element B corresponding to the green light-emitting element G is turned off, the green light is emitted The green light GL emitted by the element G cannot easily excite the corresponding blue light-emitting element B.

3 is a schematic cross-sectional view of a light-emitting device according to an embodiment of the invention. It must be noted here that the embodiment of FIG. 3 uses the component numbers and part of the content of the embodiment of FIG. 1 and FIG. 2, wherein the same or similar reference numbers are used to represent the same or similar components, and the same technical content is omitted. Description. For the description of the omitted parts, please refer to the foregoing embodiment, which is not repeated here.

Please refer to FIG. 3, each red light emitting element R in the light emitting device 20 includes a first light emitting diode 122 (for example, a blue light emitting diode) and a packaging material 124 surrounding the first light emitting diode 122. The packaging material 124 includes, for example, a polymer layer 124A and a red quantum dot material 124B dispersed in the polymer layer 124A, and the red quantum dot material 124B surrounds the first light emitting diode 122.

Each green light-emitting element G in the light-emitting device 20 includes a second light-emitting diode 222 (for example, a blue light-emitting diode) and a packaging material 224 surrounding the second light-emitting diode 222. The packaging material 224 includes, for example, a polymer layer 224A and a green quantum dot material 224B dispersed in the polymer layer 224A, and the green quantum dot material 224B surrounds the second light emitting diode 222.

Each blue light-emitting element B in the light-emitting device 20 includes a third light-emitting diode 322 (for example, a blue light-emitting diode) and a packaging material 324 surrounding the third light-emitting diode 322. The packaging material 324 is, for example, a transparent packaging material, or, for example, the packaging material 324 includes a polymer layer 324A and a blue quantum dot material 324B dispersed in the polymer layer 324A. The blue quantum dot material 324B surrounds the third light-emitting diode. 322.

Fig. 4 is an exploded schematic diagram of a light emitting device according to an embodiment of the present invention. Fig. 5 is a schematic cross-sectional view taken along the line 22' of Fig. 4; 6 is a schematic top view of some components in the liquid crystal display panel of FIG. 4. It must be noted here that the embodiments of FIGS. 4, 5, and 6 use the element numbers and part of the content of the embodiments of FIGS. 1 and 2, wherein the same or similar numbers are used to indicate the same or similar elements, and The description of the same technical content is omitted. For the description of the omitted parts, please refer to the foregoing embodiment, which is not repeated here.

Please refer to FIG. 4, FIG. 5 and FIG. 6, the light emitting device 30 further includes a liquid crystal display panel 400. The liquid crystal display panel 400 is located on the light emitting surface F3 of the third light emitting element layer 300.

The liquid crystal display panel 400 includes a substrate 410, a plurality of scan lines 420, a plurality of data lines 430, a plurality of sub-pixels 440, a liquid crystal layer 450 and an opposite substrate 460. In some embodiments, the liquid crystal display panel 400 further includes a cover layer 470, an alignment layer 480, an alignment layer 490, a polarizer P1, a polarizer P2, a driving circuit DC1, and a driving circuit DC2.

The substrate 410 is, for example, a transparent substrate. The scan line 420 and the data line 430 are located on the substrate 410. The driving circuit DC1 and the driving circuit DC2 are located on the substrate 410, and are electrically connected to the scan line 420 and the data line 430, respectively.

The sub-pixels 440 are located on the substrate 410, and each sub-pixel 440 is electrically connected to at least one corresponding scan line 420 and at least one corresponding data line 430. In some embodiments, the sub-pixel 440 includes a switch element 442 and a pixel electrode 444, and the switch element 442 is electrically connected to the pixel electrode 444, the corresponding at least one scan line 420, and the corresponding at least one data line 430. In some embodiments, the sub-pixel 440 further includes other driving elements, but the invention is not limited thereto. In this embodiment, the range of a sub-pixel 440 is defined by two adjacent scan lines 420 and two adjacent data lines 430. Each sub-pixel 440 overlaps a corresponding red light-emitting element R, a corresponding green light-emitting element G, and a corresponding blue light-emitting element B.

The liquid crystal layer 450 is located between the counter substrate 460 and the substrate 410. The liquid crystal layer 450 is located on the sub-pixel 440. In this embodiment, an alignment layer 480 is further provided between the liquid crystal layer 450 and the sub-pixel 440, and an alignment layer 490 is further provided between the liquid crystal layer 450 and the counter substrate 460. In some embodiments, there is a cover layer 470 between the alignment layer 490 and the opposite substrate 460.

The polarizer P1 and the polarizer P2 are respectively disposed on the substrate 410 and the opposite substrate 460.

In this embodiment, the first light-emitting element layer 100, the second light-emitting element layer 200, and the third light-emitting element layer 300 can be used as the backlight module BU. Since the backlight module BU can emit colored light, it is not necessary to provide a color filter element on the liquid crystal display panel 400. In this embodiment, the liquid crystal display panel 400 can be used to adjust the gray scale of the light emitted by the light emitting device 30.

In summary, the present invention can improve the resolution of the light-emitting device and reduce the manufacturing process difficulty of the light-emitting device by disposing the red light-emitting element, the green light-emitting element, and the blue light-emitting element on different light-emitting element layers, thereby improving the display device Insufficient production yield. In addition, disposing the green light-emitting element on the red light-emitting element and disposing the blue light-emitting element on the green light-emitting element can avoid mutual interference between the first light-emitting element layer, the second light-emitting element layer, and the third light-emitting element layer.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the relevant technical field can make slight changes and modifications without departing from the spirit and scope of the present invention. The scope of protection of the present invention shall be determined by the scope of the attached patent application.

11', 22'‧‧‧ Section line 10, 20, 30‧‧‧Light emitting device 100‧‧‧First light emitting element layer 110‧‧‧First substrate 122‧‧‧First light emitting diode 124,224, 324‧‧‧Encapsulation materials 124A, 224A, 324A‧‧‧Polymer layer 124B‧‧‧Red quantum dot material 200‧‧‧Second light-emitting element layer 210‧‧‧Second substrate 222‧‧‧Second light-emitting diode Body 224B‧‧‧Green quantum dot material 300‧‧‧Third light-emitting element layer 310‧‧‧Third substrate 322‧‧‧Third light-emitting diode 324B‧‧‧Blue quantum dot material 400‧‧‧Liquid crystal display Panel 410‧‧‧Substrate 420‧‧‧Scan line 430‧‧‧Data line 440‧‧‧Sub-pixel 442‧‧‧Switch element 444‧‧‧Pixel electrode 450‧‧‧Liquid crystal layer 460‧‧‧Opposite Substrate 470‧‧‧Covering layer 480‧‧‧Alignment layer 490‧‧‧Alignment layer B‧‧‧Blue light emitting elements B1, B2, B3‧‧‧Back DC1, DC2‧‧‧Drive circuit F1, F2, F3‧ ‧‧Light emitting surface G‧‧‧Green light emitting element P1, P2‧‧‧Polarizer R‧‧‧Red light emitting element

FIG. 1 is an exploded schematic diagram of a light emitting device according to an embodiment of the invention. Fig. 2 is a schematic cross-sectional view taken along line 11' of Fig. 1. 3 is a schematic cross-sectional view of a light-emitting device according to an embodiment of the invention. Fig. 4 is an exploded schematic diagram of a light emitting device according to an embodiment of the present invention. Fig. 5 is a schematic cross-sectional view taken along the line 22' of Fig. 4; 6 is a schematic top view of some components in the liquid crystal display panel of FIG. 4.

11’‧‧‧ Section line

10‧‧‧Light-emitting device

100‧‧‧First light-emitting element layer

110‧‧‧First substrate

200‧‧‧Second light-emitting element layer

210‧‧‧Second substrate

300‧‧‧The third light-emitting element layer

310‧‧‧Third substrate

B‧‧‧Blue light emitting element

B1, B2, B3‧‧‧Back

F1, F2, F3‧‧‧Emitting surface

G‧‧‧Green light emitting element

R‧‧‧Red light-emitting element

Claims (8)

A light-emitting device includes: a first light-emitting element layer having a plurality of red light-emitting elements; a second light-emitting element layer located on the light-emitting surface of the first light-emitting element layer and having a plurality of green light-emitting elements; and Three light-emitting element layers, located on the light-emitting surface of the second light-emitting element layer, and having a plurality of blue light-emitting elements, wherein the green light-emitting elements are correspondingly disposed on the red light-emitting elements, and the blue light-emitting elements correspond to Disposed on the green light-emitting elements, wherein each of the red light-emitting elements, each of the green light-emitting elements, and each of the blue light-emitting elements are individually switched on and off, wherein the first light-emitting element layer includes a first A substrate, the red light emitting elements are located on the first substrate; the second light emitting element layer includes a second substrate, the green light emitting elements are located on the second substrate; and the third light emitting element layer includes a third substrate , The blue light-emitting elements are located on the third substrate. The light-emitting device according to claim 1, wherein each of the red light-emitting elements includes a first blue light-emitting diode and a red fluorescent material or a red fluorescent material surrounding the first blue light-emitting diode A red phosphorescent material; each of the green light emitting elements includes a second blue light emitting diode and a green fluorescent material or a green phosphorescent material surrounding the second blue light emitting diode; and Each of the blue light-emitting elements includes a third blue light-emitting diode and a transparent packaging material, a blue fluorescent material or a blue phosphorescent material surrounding the third blue light-emitting diode. The light-emitting device according to claim 1, wherein each of the red light-emitting elements includes a first blue light-emitting diode and a red quantum dot material surrounding the first blue light-emitting diode; Each of the green light-emitting elements includes a second blue light-emitting diode and a green quantum dot material surrounding the second blue light-emitting diode; and each of the blue light-emitting elements includes a third blue light-emitting diode A diode and a transparent packaging material or a blue quantum dot material surrounding the third blue light-emitting diode. The light-emitting device described in item 1 of the scope of patent application further includes: a liquid crystal display panel located on the light-emitting surface of the third light-emitting element layer. According to the light-emitting device described in claim 4, the liquid crystal display panel includes: a substrate; a plurality of scan lines and a plurality of data lines on the substrate; a plurality of sub-pixels on the substrate; a liquid crystal A layer located on the sub-pixels; and a counter substrate, the liquid crystal layer is located between the counter substrate and the substrate. According to the light-emitting device described in item 5 of the scope of patent application, each of the sub-pixels overlaps a corresponding red light-emitting element, a corresponding green light-emitting element, and a corresponding blue light-emitting element. The light-emitting device according to claim 1, wherein the red light-emitting elements, the green light-emitting elements, and the blue light-emitting elements are smaller than 200 microns in size. According to the light-emitting device described in claim 1, wherein each of the red light-emitting elements includes an organic red light-emitting diode, each of the green light-emitting elements includes an organic green light-emitting diode, and each The blue light-emitting element includes an organic blue light-emitting diode.

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