TW202032181A - Light emitting device and liquid crystal display device - Google Patents

Abstract

A light emitting device includes a light emitting diode. The light emitting diode includes a blue light emitting layer and a first wavelength conversion layer. The first wavelength conversion layer is disposed on a light outgoing surface of the blue light emitting layer. The light emitting device also includes a second wavelength conversion layer and a substrate. The blue light emitting layer is between the first wavelength conversion layer and the second wavelength conversion layer. The substrate includes a light reflection surface and an outermost surface opposite to the light reflection surface. The first wavelength conversion layer is between the blue light emitting layer and the light reflection surface.

Description

Light emitting device and liquid crystal display

This disclosure relates to a light emitting device and a liquid crystal display.

Liquid Crystal Display (LCD) has the advantages of power saving, light weight, low radiation and easy portability. It can be widely used in TVs, computer screens, notebook computers, car navigation systems, mobile communication devices, etc., and has gradually replaced traditional The display has become the mainstream product on the market. Among them, one of the key components used to provide the light source is the Backlight Module, whose purpose is to further form the point light source or the line light source emitted by the light-emitting element into a uniform surface light source to provide the use of a liquid crystal panel.

The use of light-emitting diodes as light-emitting elements has been widely used in the fields of displays and lighting. However, with regard to the structure of the existing light-emitting element using a light-emitting diode as a light source, it is relatively difficult to homogenize the light emitted by the light-emitting diode. Therefore, how to improve the luminous efficiency of the light-emitting element and the brightness uniformity of the light-emitting area has become an urgent issue to be solved.

The embodiment of the disclosure provides a light-emitting device and a liquid crystal monitor. By making the vertical projection area of the first wavelength conversion layer on the first substrate fall within the vertical projection area of the blue light-emitting layer on the first substrate, the light conversion efficiency of the first wavelength conversion layer is improved, and by setting the first wavelength The conversion layer and the second wavelength conversion layer are on different sides of the blue light-emitting layer, which can improve the chromaticity uniformity and brightness of the light-emitting device. The light-emitting device further includes a first light-reflecting structure and a second light-reflecting structure. The blue light and the first color light are reflected toward the left and right sides of the first substrate to prevent the blue light and the first color light from being reflected back to the light emitting diode. The second light reflecting structure is used to destroy the total reflection of the light in the light guide layer and improve the performance of the light emitting device. Light efficiency.

In one embodiment, a light emitting device includes a light emitting diode, the light emitting diode includes a blue light emitting layer and a first wavelength conversion layer, and the first wavelength conversion layer is disposed on a light emitting surface of the blue light emitting layer. The light emitting device further includes a second wavelength conversion layer and a substrate. The blue light emitting layer is located between the first wavelength conversion layer and the second wavelength conversion layer. The substrate has a reflective surface and an outer surface opposite to the reflective surface, and the first wavelength conversion layer is located between the blue light emitting layer and the reflective surface.

In one embodiment, a liquid crystal display includes a plurality of light-emitting devices and a liquid crystal display panel as described above, and the liquid crystal display panel is located on the light-emitting device.

10, 10a, 10b‧‧‧Lighting device

12‧‧‧LCD display

14‧‧‧Light source module

16‧‧‧LCD display panel

18‧‧‧Wire

100‧‧‧Light Emitting Diode

102‧‧‧Blue light emitting layer

102a‧‧‧Glossy surface

104‧‧‧First wavelength conversion layer

106‧‧‧Second wavelength conversion layer

108‧‧‧First substrate

108a‧‧‧Reflective surface

108b‧‧‧Outer surface

109‧‧‧Reflective Wall

110‧‧‧First reflective structure

111‧‧‧Base

112‧‧‧Second reflective structure

114a‧‧‧First insulating bump

114b‧‧‧Second insulating bump

116a‧‧‧First reflective layer

116b‧‧‧Second reflective layer

118‧‧‧Light guide layer

120‧‧‧Transparent dielectric layer

122‧‧‧Second substrate

124‧‧‧First semiconductor layer

126‧‧‧Second semiconductor layer

128‧‧‧First electrode

130‧‧‧Second electrode

132‧‧‧Third electrode

134‧‧‧Fourth electrode

136‧‧‧Light diffusion layer

136a‧‧‧Top surface

136b‧‧‧Bottom

B1, B2‧‧‧Bottom

BL‧‧‧Blu-ray

D1, D2‧‧‧Distance

H1, H2‧‧‧Height

L1‧‧‧First color light

L2‧‧‧Second color light

S1, S2‧‧‧Side

T‧‧‧Thickness

WL‧‧‧White light

θ 1‧‧‧First angle

θ 2‧‧‧second angle

Read the following detailed description and match the corresponding drawings to understand many aspects of this disclosure. It should be noted that many of the features in the drawing are not drawn in actual proportions according to the standard practice in the industry. In fact, the size of the feature can be increased or decreased arbitrarily to facilitate the clarity of the discussion.

Figure 1A shows a cross-sectional view of a light emitting device according to an embodiment of the present disclosure; Figure 1B shows a schematic diagram of a light exit path of Figure 1A; Figure 2 shows a cross section of a light emitting device according to another embodiment of the present disclosure Figures; Figure 3 shows a cross-sectional view of a liquid crystal display according to an embodiment of the present disclosure; and Figure 4 shows a top view of a light source module according to an embodiment of the present disclosure.

The following will clearly illustrate the spirit of the present disclosure with drawings and detailed descriptions. Anyone with ordinary knowledge in the relevant technical field can change and modify the techniques taught in the present disclosure after understanding the embodiments of the present disclosure. Depart from the spirit and scope of this disclosure. For example, the statement that "the first feature is formed on or on the second feature" will include the first feature and the second feature having direct contact; and will also include the first feature and the second feature being indirect The contact has an additional feature formed between the first feature and the second feature. In addition, the present disclosure will reuse component numbers and/or text in multiple examples. The purpose of repetition is to simplify and clarify, and it does not determine the relationship between multiple embodiments and/or the discussed configurations.

In addition, relative terms such as "below", "below", "below", "above" or "up" or similar terms are used in this article to facilitate the description of the words shown in the diagram The relationship of one element or feature to another element or feature. In addition to describing the position of the device in the diagram, the relative position vocabulary includes the different positions of the device under use or operation. When the device is additionally set (Rotate by 90 degrees or other orientations), the relative vocabulary of orientation used in this article can also be explained accordingly.

FIG. 1A is a cross-sectional view of a light emitting device 10 according to an embodiment of the disclosure. Figure 1B shows a schematic diagram of the light exit path of Figure 1A. Please refer to Figure 1A and Figure 1B together. The light emitting device 10 includes a light emitting diode 100, and the light emitting diode 100 includes a blue light emitting layer 102 and a first wavelength conversion layer 104. The first wavelength conversion layer 104 is disposed on the light emitting surface 102a of the blue light emitting layer 102, the blue light emitting layer 102 emits blue light BL, and the first wavelength conversion layer 104 is used to convert the blue light BL into the first color light L1. The light emitting device 10 further includes a second wavelength conversion layer 106, a first substrate 108, and a reflective wall 109. The first substrate 108 and the reflective wall 109 constitute a base 111, and the light emitting diode 100 is located on the second wavelength conversion layer 106 and the first substrate 108 In between, the blue light emitting layer 102 is located between the first wavelength conversion layer 104 and the second wavelength conversion layer 106. The first substrate 108 has a reflective surface 108a and an outer surface 108b opposite to the reflective surface 108a. The material of the first substrate 108 may be a light-transmitting material. For example, the first substrate 108 may be a glass substrate, a quartz substrate, a sapphire substrate, or other suitable hard substrates or flexible substrates, but the present disclosure is not limited to this. . The reflective wall 109 has the ability to reflect light, so its material is a reflective material. The material of the reflective wall 109 may include metal material or non-metal material. The metal material may include composite metals such as titanium, gold, aluminum, silver, platinum, palladium or more. The non-metallic material may be selected from polyphthalamide, ceramics, and polycarbonate. The non-metallic material can also be a polymer material doped with a reflective material, wherein the doped material includes a reflective non-metallic material or a metallic material.

The vertical projection area of the first wavelength conversion layer 104 on the first substrate 108 is within the vertical projection area of the blue light emitting layer 102 on the first substrate 108 Inside, because the blue light BL emitted by the blue light emitting layer 102 is approximately circular, and its light intensity is similar to the Lambertian distribution, as a result, the blue light BL emitted by the blue light emitting layer 102 can easily enter the first The wavelength conversion layer 104 improves the light conversion efficiency of the first wavelength conversion layer 104 and can mix the blue light BL and the first color light L1 uniformly.

The second wavelength conversion layer 106 can convert the blue light BL emitted by the blue light emitting layer 102 into a second color light L2. The wavelength of the first color light L1 is different from the wavelength of the second color light L2. In one embodiment, the first color light The mixed light of L1, the second color light L2 and the blue light BL becomes white light WL. By disposing the first wavelength conversion layer 104 and the second wavelength conversion layer 106 on different layers, the first color light L1, the second color light L2, and the blue light BL can be fully mixed into white light WL, so that the chromaticity of the light emitting device 10 is The brightness is uniform. In an embodiment, the first wavelength conversion layer 104 includes a red light wavelength conversion material, the second wavelength conversion layer 106 includes a green light wavelength conversion material, the first color light L1 is red light, and the second color light L2 is green light. Since the green light is easily absorbed by the red wavelength conversion material, the second wavelength conversion layer 106 and the first wavelength conversion layer 104 are arranged on the different side of the blue light emitting layer 102, and the second wavelength conversion layer 106 is longer than the first wavelength conversion layer. The conversion layer 104 is farther away from the reflective surface 108a of the first substrate 108, and the vertical projection area of the first wavelength conversion layer 104 on the first substrate 108 is smaller than the vertical projection area of the second wavelength conversion layer 106 on the first substrate 108, which can reduce green The probability of light being absorbed by the first wavelength conversion layer 104 improves the brightness of the light-emitting device 10.

In addition, the second wavelength conversion layer 106 is separated from the light emitting diode 100 by a distance D1, so that enough space can be provided to fully mix the first color light L1, the second color light L2, and the blue light BL. The first wavelength conversion layer 104 and the second wave The material of the long conversion layer 106 is, for example, phosphor, quantum dot, or light conversion material.

The light emitting surface 102a of the blue light emitting layer 102 faces the light reflecting surface 108a of the first substrate 108, and the first wavelength conversion layer 104 is located between the blue light emitting layer 102 and the light reflecting surface 108a. The reflective surface 108a has at least a first reflective structure 110 and a plurality of second reflective structures 112. In one embodiment, the first reflective structure 110 has a first insulating bump 114a and a first reflective layer 116a, and the second reflective structure 112 has a Two insulating bumps 114b and a second reflective layer 116b. The first reflective layer 116a and the second reflective layer 116b are respectively located on the first insulating bump 114a and the second insulating bump 114b. The first and second insulating bumps 114a, 114b can include inorganic dielectric materials and resin materials, and the inorganic dielectric materials can be boron nitride, aluminum oxide, aluminum nitride, beryllium oxide, barium sulfate, magnesium oxide, or zirconium oxide. . The first and second reflective layers 116a, 116b may be metal reflective layers. For example, the materials of the first and second reflective layers 116a, 116b include aluminum, silver, other materials with high reflectivity, or a combination thereof. In one embodiment, the base 111 is cup-shaped, and the first color light L1, the second color light L2, and the blue light BL reflected by the first reflective structure 110 and the second reflective structure 112 can be reflected by the reflective wall 109 to the outside, thereby The luminous efficiency of the light-emitting device 10 is improved.

Since the light emitting surface 102a of the blue light emitting layer 102 faces the reflective surface 108a of the first substrate 108, the blue light BL emitted by the blue light emitting layer 102 and the first color light L1 converted by the first wavelength conversion layer 104 are directed toward the first substrate The reflective surface 108a of 108 is specifically directed toward the first reflective structure 110 and the second reflective structure 112. In one embodiment, the first reflective structure 110 is an axisymmetric structure. For example, the first reflective structure 110 may be an isosceles triangle, and the insulating bump 114 of the first reflective structure 110 is vertically projected on the first substrate 108 Partially overlaps the vertical projection of the light emitting diode 100 on the first substrate 108, so the first reflective structure 110 can Reflect most of the blue light BL and most of the first color light L1 toward the left and right sides of the first substrate 108. In this way, the blue light BL and the first color light L1 can be prevented from being reflected back to the light emitting diode 100 to make the light emitting diode The body 100 reduces light loss during operation and improves its light output efficiency, so that the brightness of the light emitting device 10 is improved. The vertical distance D2 between the light emitting diode 100 and the top of the first reflective structure 110 is between about 10 microns and about 100 microns. As a result, the first reflective structure 110 can make the blue light BL and the first color light L1 effectively face The left and right sides of the first substrate 108 are reflected.

The light emitting device 10 further includes a light guide layer 118 and a light transmissive medium layer 120. The light guide layer 118 is located between the blue light emitting layer 102 and the first light reflecting structure 110 and the second light reflecting structure 112. The thickness T of the light guide layer 118 is greater than that of the first light reflecting structure. The height of the reflective structure 110 (such as the sum of the height H of the first insulating bump 114a and the thickness of the first reflective layer 116a) is greater than the height of the second reflective structure 112 (such as the height H of the second insulating bump 114b and the second The total thickness of the reflective layer 116b), the light-transmitting medium layer 120 is located between the light guide layer 118 and the second wavelength conversion layer 106. The refractive index of the light-transmitting medium layer 120 is smaller than the refractive index of the light guide layer 118. In one embodiment, the refractive index of the light guide layer 118 is between about 1.46 and about 5, and the refractive index of the light-transmitting medium layer 120 is between about 1 and about 1.3. The travel route of the blue light BL and the first color light L1 first enter the transparent medium layer 120 and the light guide layer 118 in sequence, and then are reflected by the first light reflecting structure 110 and the second light reflecting structure 112. The light guide layer 118 is used to The blue light BL and the first color light L1 reflected by the light reflecting structure 110 and the second light reflecting structure 112 are emitted toward the light-transmitting medium layer 120 to improve the front light emission efficiency of the light emitting device 10. The travel path of the second color light L2 enters the light-transmitting medium layer 120 and the light guide layer 118 in sequence, and is then reflected by the first light reflecting structure 110 and the second light reflecting structure 112. The light guide layer 118 is used to connect the first light reflecting structure 110 with The second reflective structure 112 reflects the The dichroic light L2 is emitted toward the light-transmitting medium layer 120 to improve the front light emission efficiency of the light-emitting device 10. The thickness T of the light guide layer 118 is between about 10 μm and about 100 μm, so as to effectively reflect the blue light BL, the first color light L1 and the second color light L2 to the transparent medium layer 120. The material of the light guide layer 118 can be resin material or silicon material. In an embodiment, the light-transmitting medium layer 120 may be air, and its refractive index is close to 1.

The size of the first reflective structure 110 is different from the size of each second reflective structure 112. In one embodiment, the vertical projection area of the first reflective structure 110 on the first substrate 108 is larger than the vertical projection area of each second reflective structure 112 on the first substrate 108. In an embodiment, the side surface S1 and the bottom surface B1 of the first insulating bump 114a sandwich a first angle θ1, the side surface S2 and the bottom surface B2 of the second insulating bump 114b sandwich a second angle θ2, and the first angle θ1 and The second angle θ 2 is greater than about 30° and less than about 60°, and the first angle θ 1 is smaller than the second angle θ 2. As a result, the second light reflecting structure 112 can damage the first color light L1, the second color light L2, and The total reflection of the blue light BL in the light guide layer 118 increases the light extraction efficiency of the first color light L1, the second color light L2, and the blue light BL.

The light emitting diode 100 further includes a second substrate 122, a first semiconductor layer 124, a second semiconductor layer 126, a first electrode 128, and a second electrode 130. The first electrode 128 and the second electrode 130 are electrically opposite. The blue light emitting layer 102 is disposed on the first semiconductor layer 124, and the first wavelength conversion layer 104 is disposed between the blue light emitting layer 102 and the second semiconductor layer 126. The first electrode 128 is disposed on the first semiconductor layer 124, and the second electrode 130 is disposed on the second semiconductor layer 126. The top surface of the light guide layer 118 is provided with a third electrode 132 and a fourth electrode 134. The third electrode 132 and the fourth electrode 134 are electrically opposite to each other. The first electrode 128 of the light emitting diode 100 and the light guide layer The third electrode 132 of the 118 is electrically connected, and the second electrode 130 of the light emitting diode 100 is electrically connected to the fourth electrode 134 of the light guide layer 118. In one embodiment, the first electrode 128, the The two electrodes 130 are electrically connected to the third electrode 132 and the fourth electrode 134 respectively.

In some embodiments, the second substrate 122 is made of a transparent material to facilitate light emission. For example, the second substrate 122 can be a glass substrate, a quartz substrate, a sapphire substrate, or other suitable hard substrates or flexible substrates, but the disclosure is not limited to this. In one embodiment, the first semiconductor layer 124 is an N-type semiconductor layer, the second semiconductor layer 126 is a P-type semiconductor layer, the first electrode 128 is a positive electrode, and the second electrode 130 is a negative electrode, an N-type semiconductor layer and a P-type semiconductor layer The material of the layer is gallium nitride (GaN). The N-type semiconductor layer mainly provides electrons, and the P-type semiconductor layer mainly provides holes. The material of the blue light emitting layer 102 includes a multiple quantum well (MQW) structure, which may include a gallium nitride-based material, which mainly gathers electrons and holes to generate light.

FIG. 2 is a cross-sectional view of a light-emitting device 10a according to another embodiment of the present disclosure. The light-emitting path of the light-emitting device 10a is similar to that of the light-emitting device 10, so it is omitted from the figure. As shown in Figure 2, the difference between this embodiment and the embodiment shown in Figures 1A and 1B is mainly that: this embodiment further includes a light diffusion layer 136, which is disposed on the second wavelength conversion Between the layer 106 and the blue light emitting layer 102, that is, the light diffusion layer 136 is placed between the second wavelength conversion layer 106 and the light emitting diode 100. The light diffusion layer 136 has a top surface 136a and a bottom surface 136b opposite to each other. The bottom surface 136b can have a matte surface treatment, a scattering point design or the like. The bottom surface 136b contacts the light-transmitting medium layer 120, so that the first color light L1 and the blue light BL are uniformly mixed. The top surface 136a of the light diffusion layer 136 contacts the second wavelength conversion layer 106. In this way, when the uniformly mixed first color light L1 and blue light BL reach the second wavelength conversion layer 106, the blue light BL can be uniformly converted into the second color light L2 by the second wavelength conversion layer 106. In this way, The uniformity of mixing of the first color light L1, the second color light L2 and the blue light BL of the light emitting device 10a is improved. Moreover, when the second color light L2 emitted toward the light-transmitting medium layer 120 is reflected back to the light diffusion layer 136, the light diffusion layer 136 can also uniformly mix the second color light L2 with the first color light L1 and the blue light BL, thereby improving the performance of the light emitting device 10a. The uniformity of the mixing of the first color light L1, the second color light L2 and the blue light BL enables the light emitting device 10a to emit light with uniform brightness and high color rendering.

FIG. 3 shows a cross-sectional view of a liquid crystal display (LCD) 12 according to an embodiment of the present disclosure. The liquid crystal display 12 includes a light source module 14 and a liquid crystal display panel 16 composed of a plurality of light emitting devices 10b, and emits light The structure of the device 10b can adopt the structure of the light emitting device 10 or the light emitting device 10a as required. The light emitting devices 10b can be arranged in a matrix. The liquid crystal display panel 16 is located on the light source module 14 to receive light from the light source module 14. The light emitting device 10b can The liquid crystal display panel 16 is provided with uniform brightness and high color rendering light to improve the display quality of the liquid crystal display panel 16. FIG. 4 is a top view of the light source module 14 according to an embodiment of the disclosure. Please refer to FIGS. 3 and 4 together. The light source module 14 further includes a plurality of wires 18, one end of which is electrically connected to the light emitting device 10b, and the other end is electrically connected to the control circuit and ground (not shown). The wire 18 may be electrically connected to the third electrode 132 and the fourth electrode 134 by means such as welding or hot pressing. The connection method of the light-emitting devices 10b is not limited here. The light-emitting devices 10b can be connected in parallel, in series, or partially in parallel or partially in series. Those with ordinary knowledge in this field can base on the number of light-emitting devices 10b and actual requirements. Adjust the connection mode of the light emitting device 10b. Understandably, in order to fill The number of light-emitting devices 10b can be selected according to the needs to meet the light-emitting requirements of greater power.

The light source module 14 may further include an optical sheet (not shown) such as a diffusion sheet, a rim sheet, a brightness enhancement sheet, etc., and the optical sheet may be disposed between the liquid crystal display panel 16 and the light emitting device 10b. In other embodiments, if the light source module 14 is implemented in the form of a side-lit backlight module, the light source module 14 may include a light guide plate having adjacent light incident surfaces and light output surfaces. At this time, the light emitting direction of the light emitting device 10b may face the light incident surface of the light guide plate, and the light output surface of the light guide plate may face the liquid crystal display panel 16.

The light emitting device improves the light conversion efficiency of the first wavelength conversion layer by making the vertical projection area of the first wavelength conversion layer on the first substrate fall within the vertical projection area of the blue light emitting layer on the first substrate, and by setting the A wavelength conversion layer and a second wavelength conversion layer are on different sides of the blue light emitting layer, which can improve the chromaticity uniformity and brightness of the light emitting device. The light emitting device further includes a first light reflecting structure and a second light reflecting structure. In order to make the blue light and the first color light reflect toward the left and right sides of the first substrate to prevent the blue light and the first color light from being reflected back to the light emitting diode, the second light reflecting structure is used to destroy the total reflection of the light in the light guide layer and improve the light emission The light output efficiency of the device.

The above summarizes the characteristics of several implementations or embodiments, so that those with ordinary knowledge in the field can better understand the present disclosure from various aspects. Those skilled in the art should understand, and can easily design or modify other processes and structures based on this disclosure, so as to achieve the same purpose and/or to achieve the implementation modes or embodiments introduced herein The same advantages. Those with ordinary knowledge in the technical field should also understand that these equivalent structures do not deviate from this disclosure The spirit and scope of disclosure. Without departing from the spirit and scope of this disclosure, various changes, substitutions or modifications can be made to this disclosure.

10‧‧‧Light-emitting device

100‧‧‧Light Emitting Diode

102‧‧‧Blue light emitting layer

102a‧‧‧Glossy surface

104‧‧‧First wavelength conversion layer

106‧‧‧Second wavelength conversion layer

108‧‧‧First substrate

108a‧‧‧Reflective surface

108b‧‧‧Outer surface

109‧‧‧Reflective Wall

110‧‧‧First reflective structure

111‧‧‧Base

112‧‧‧Second reflective structure

114a‧‧‧First insulating bump

114b‧‧‧Second insulating bump

116a‧‧‧First reflective layer

116b‧‧‧Second reflective layer

118‧‧‧Light guide layer

120‧‧‧Transparent dielectric layer

122‧‧‧Second substrate

124‧‧‧First semiconductor layer

126‧‧‧Second semiconductor layer

128‧‧‧First electrode

130‧‧‧Second electrode

132‧‧‧Third electrode

134‧‧‧Fourth electrode

B1, B2‧‧‧Bottom

D1, D2‧‧‧Distance

H1, H2‧‧‧Height

S1, S2‧‧‧Side

T‧‧‧Thickness

θ 1‧‧‧First angle

θ 2‧‧‧second angle

Claims (10)

A light-emitting device includes: a light-emitting diode, including a blue light-emitting layer and a first wavelength conversion layer, the first wavelength conversion layer is arranged on a light-emitting surface of the blue light-emitting layer; a second wavelength conversion layer, wherein The blue light emitting layer is located between the first wavelength conversion layer and the second wavelength conversion layer; and a substrate has a light reflecting surface and an outer surface opposite to the light reflecting surface. The first wavelength conversion layer is located on the blue light emitting layer. Between the layer and the reflective surface. The light-emitting device according to claim 1, further comprising: a reflective wall, the reflective wall and the substrate forming a base, the base is cup-shaped, and the reflective surface has at least one first reflective structure and a plurality of second reflective structures The size of the first reflective structure is different from the size of each of the second reflective structures. The light emitting device according to claim 2, wherein the first reflective structure has a first insulating bump and a first reflective layer, the first reflective layer is located on the first insulating bump, and the first insulating bump The vertical projection on the substrate overlaps the vertical projection of the light-emitting diode on the substrate. The light emitting device according to claim 2, wherein the vertical projection area of the first reflective structure on the substrate is larger than the vertical projection area of each of the second reflective structures on the substrate, wherein the second reflective structure has a second insulating protrusion Block and a second reflective layer located on the second insulating bump And the side surface and the bottom surface of the first insulation bump sandwich a first angle, the side surface and the bottom surface of the second insulation bump sandwich a second angle, the first angle and the second angle are greater than about 30° and less than It is about 60°, and the first angle is smaller than the second angle. The light-emitting device according to claim 2, wherein the light-emitting diode comprises: a first semiconductor layer, the blue light-emitting layer is disposed on the first semiconductor layer; a second semiconductor layer, the first wavelength conversion layer is disposed Between the blue light emitting layer and the second semiconductor layer; a first electrode disposed on the first semiconductor layer; and a second electrode disposed on the second semiconductor layer, wherein the light emitting diode and The vertical distance of the top of the first reflective structure is between about 10 microns and about 100 microns. The light emitting device according to claim 2, further comprising: a light guide layer located between the blue light emitting layer and the first light reflecting structure and the second light reflecting structures, and the thickness of the light guide layer is about 10 microns And a light-transmitting medium layer located between the light guide layer and the second wavelength conversion layer, wherein the refractive index of the light-transmitting medium layer is lower than the refractive index of the light guide layer, and the transparent The refractive index of the optical medium layer is between about 1 and about 1.3. The light-emitting device according to claim 6, further comprising: a light diffusion layer disposed between the second wavelength conversion layer and the blue light emitting layer, the light diffusion layer contacting the second wavelength conversion layer and the light-transmitting medium Floor. The light-emitting device according to claim 1, wherein the vertical projection area of the first wavelength conversion layer on the substrate is within the vertical projection area of the blue light emitting layer on the substrate. The light-emitting device according to claim 1, wherein the first wavelength conversion layer includes a red wavelength conversion material, and the second wavelength conversion layer includes a green wavelength conversion material. A liquid crystal display, comprising: a plurality of light-emitting devices as described in any one of claims 1 to 9; and a liquid crystal display panel located on the light-emitting devices.

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