TWI572062B - Light emitting device and display apparatus - Google Patents

Description

Light-emitting element and display device

The present invention relates to an optical component and an optical device, and more particularly to a light emitting device and a display device.

The light-emitting diode wafer has advantages such as long life, small volume, and low power consumption, and thus has been widely applied to various light-emitting elements. In recent years, light-emitting elements have developed toward multiple colors and high brightness, and thus the field of application of light-emitting elements has been extended to display devices such as large outdoor billboards, traffic lights, and the like.

Conventional light-emitting elements include a red light-emitting diode chip, a green light-emitting diode chip, a blue light-emitting diode chip, and an encapsulant. The red light emitting diode chip and the blue light emitting diode chip are respectively disposed on opposite sides of the green light emitting diode chip. The encapsulant covers the red light emitting diode chip, the green light emitting diode chip, and the blue light emitting diode chip. Since the red light emitting diode chip and the blue light emitting diode chip are respectively disposed on opposite sides of the green light emitting diode chip, generally, red light, green light, and blue light will pass through the encapsulant. Distributed over three different light distribution ranges. In detail, the distribution of red light and blue light The distribution range will deviate from the distribution of green light. As a result, when the light-emitting element is applied to a display device, the display device is liable to cause color unevenness.

The present invention provides a light-emitting element which has excellent optical characteristics.

The present invention provides a display device which is less prone to color unevenness.

The invention provides a light emitting element comprising a first light emitting chip, a second light emitting chip, a third light emitting chip and an encapsulant. The first illuminating wafer is configured to emit a first color light. The second illuminating wafer is configured to emit a second color light. The third illuminating wafer is used to emit a third color light. The first luminescent wafer, the second luminescent wafer, and the third luminescent wafer are sequentially arranged along the arrangement direction. The encapsulant covers the first luminescent wafer, the second luminescent wafer, and the third luminescent wafer and has a light emitting surface. The encapsulant system has an arcuate body and a joint, while the arcuate system has a uniaxial curvature change.

The present invention provides a display device comprising a plurality of light emitting elements as described above. These light emitting elements are arranged in an array.

In an embodiment of the invention, the orthographic projection of the arcuate body on the first reference plane is arcuate. The normal direction of the first reference plane is perpendicular to the alignment direction. The orthographic projection of the connecting portion on the first reference plane is a first rectangle.

In an embodiment of the invention, the first rectangle has a first straight line. The first line is located next to the orthographic projection of the first luminescent wafer on the first reference plane. The first line intersects the arc of the arc at a reference point. The reference point is connected to the orthographic projection of the first illuminating wafer on the first reference plane as a reference line. This reference line and the first straight The clip has an acute angle θ, where 20 degrees ≦ θ ≦ 70 degrees.

In an embodiment of the invention, the arcuate shape has an arc top perpendicular. The angle between the vertical line of the arc and the line connecting the top of the arc and the second illuminating chip is between 0 and 20 degrees.

In an embodiment of the invention, the arcuate shape has an arc top perpendicular. The angle between the vertical line of the arc and the line connecting the top of the arc and the first illuminating chip and the line connecting the vertical line of the arc to the line connecting the arc top and the third illuminating chip are respectively less than 70 degrees.

In an embodiment of the invention, the arcuate body has a radius of curvature of between 2 cm and 5 cm.

In an embodiment of the invention, the light emitting element further includes a substrate. The substrate has a bearing surface. The first luminescent wafer, the second luminescent wafer, and the third luminescent wafer are disposed on a bearing surface of the substrate. The normal direction of the bearing surface and the arrangement direction are located on the first reference plane.

In an embodiment of the invention, the substrate comprises a light absorbing layer. The first luminescent wafer, the second luminescent wafer, and the third luminescent wafer are exposed outside the light absorbing layer.

In an embodiment of the invention, the first light emitting chip, the second light emitting chip, and the third light emitting chip are electrically independent of each other.

Based on the above, the light-emitting element according to an embodiment of the present invention transmits the first color light emitted by the first light-emitting chip and the third color light emitted by the third light-emitting chip to the optical axis of the second light-emitting chip through the specially designed encapsulant. Thereby, the first color light, the second color light, and the third color light can be distributed substantially within the same specified range. When the light-emitting element is applied to a display device, since each of the light-emitting elements can project the first color light, the second color light, and the third color light into a specified range, in the prior art, The problem of uneven color of the display device can be improved.

The above described features and advantages of the invention will be apparent from the following description.

100,200‧‧‧Lighting elements

112‧‧‧First light-emitting chip

114‧‧‧Second light-emitting chip

116‧‧‧ Third illuminating chip

120‧‧‧Package colloid

120A‧‧‧Arc

120B‧‧‧Connecting Department

120a, 220a‧‧‧ shiny surface

122‧‧‧Arc

124‧‧‧ bow

124a‧‧‧Arc top

126, 128, 129‧‧‧ rectangle

128a, 128b‧‧‧ straight line

130‧‧‧Substrate

130a‧‧‧ bearing surface

131‧‧‧First electrode

132‧‧‧Light absorbing layer

133‧‧‧second electrode

134‧‧‧Insulation

135‧‧‧ third electrode

136‧‧‧fourth electrode

137‧‧‧ fifth electrode

212‧‧‧fourth light-emitting chip

214‧‧‧Film light-emitting chip

216‧‧‧6th illuminating chip

1000‧‧‧ display device

A-A’, B-B’‧‧‧ cut line

L1‧‧‧ arc top perpendicular

L2, L3‧‧‧ connection

P‧‧‧ reference point

S1~S6‧‧‧ Curve

X‧‧‧ optical axis

X‧‧‧ normal direction of the first reference plane

y‧‧‧Arranged direction

Z‧‧‧direction

Θ‧‧‧ acute angle

θ 1, θ 2‧‧‧ angle

1A is a schematic perspective view of a light-emitting element according to an embodiment of the present invention.

Fig. 1B is a schematic cross-sectional view of a light-emitting element taken along line A-A' of Fig. 1A.

Fig. 1C is a schematic cross-sectional view of a light-emitting element taken along line B-B' of Fig. 1A.

2 is a schematic perspective view of a light-emitting element of a comparative example.

3A, 3B, and 3C show the first color light emitted by the first light-emitting chip of FIG. 1, the second color light emitted by the second light-emitting chip, and the third color light emitted by the third light-emitting chip, respectively, after passing through the encapsulant. Light intensity distribution.

4A, 4B, and 4C show the fourth color light emitted by the fourth light-emitting chip of FIG. 2, the fifth color light emitted by the fifth light-emitting chip, and the sixth color light emitted by the sixth light-emitting chip, respectively, after passing through the encapsulant. Light intensity distribution.

FIG. 5 is a schematic diagram of a display device according to an embodiment of the present invention.

1A is a schematic perspective view of a light-emitting element according to an embodiment of the present invention. Figure 1B is a schematic cross-sectional view of the light-emitting element according to the line A-A' of Fig. 1A. Fig. 1C is a schematic cross-sectional view of a light-emitting element taken along line B-B' of Fig. 1A. Referring to FIG. 1A , FIG. 1B and FIG. 1C , the light emitting device 100 includes a first light emitting chip 112 , a second light emitting chip 114 , a third light emitting chip 116 , and an encapsulant 120 . The first luminescent wafer 112, the second luminescent wafer 114, and the third luminescent wafer 116 are luminescent diode wafers. The first light-emitting chip 112, the second light-emitting chip 114, and the third light-emitting chip 116 are sequentially arranged along the arrangement direction y, and are respectively used to emit the first color light, the second color light, and the third color light. The color of the first color light, the color of the second color light, and the color of the third color light are not particularly limited, and may be the same or different from each other. Preferably, one of the first color light, the second color light, and the third color light is white light, or both are mixed into white light, or the three are mixed into white light. The encapsulant 120 is a light transmissive material. The encapsulant 120 covers the first illuminating wafer 112, the second illuminating wafer 114, and the third illuminating wafer 116 and has a light emitting surface 120a. The first color light, the second color light, and the third color light exit the encapsulant 120 from the light exit surface 120a. In the present invention, the encapsulant 120 has an arcuate body 120A and a connecting portion 120B, wherein the arcuate body 120A has a uniaxial curvature change.

In this embodiment, the first color light emitted by the first light emitting chip 112 may be red light, the second color light emitted by the second light emitting chip 114 may be green light, and the third color light emitted by the third light emitting chip 116 may be Blu-ray. However, the present invention is not limited thereto. In other embodiments, the first color light may be red light, the second color light may be blue light, and the third color light may be green light; the first color light may be green light, and the second color light may be green light, second The color light may be blue light, and the third color light may be red light; the first color light may be green light, the second color light may be red light, and the third color light may be blue light; the first color light may be blue light, and the second color light may be blue light, second color light Can be green, and third The color light may be red light; or the first color light may be blue light, the second color light may be red light, and the third color light may be green light. In addition, the present invention also does not limit the color of the first color light, the color of the second color light, and the color of the third color light to be a combination of red, green, and blue. In other embodiments, the color of the first color light, The color of the two-color light or the color of the third color light may also be selected from colors other than red, green, and blue, or may be white. Such variations are within the scope of the invention as intended.

The normal direction x of the first reference plane is perpendicular to the alignment direction y. The direction z is perpendicular to the normal direction x of the first reference plane and the alignment direction y. The first reference plane is, for example, a yz plane in which the direction y and the direction z are arranged, as shown in the paper plane of FIG. 1B. It should be noted that the orthographic projection of the light exiting surface 120a of the encapsulant 120 on the first reference plane (eg, the yz plane) is an arc 122 (shown in FIG. 1B). The arc 122 is convex toward the direction z away from the first illuminating wafer 112, the second illuminating wafer 114, and the third illuminating wafer 116. In other words, the encapsulant 120 has an arcuate body 120A (shown in FIG. 1A) and a connecting portion 120B. The orthographic projection of the arcuate body 120A on the first reference plane (e.g., the yz plane) is an arcuate 124 having an arc 122 (shown in Figure IB). In the present embodiment, the radius of curvature of the curved body 120A is, for example, between 2 cm and 5 cm, but the invention is not limited thereto, and the radius of curvature of the curved body 120A may be determined according to actual needs. In addition, in this embodiment, the first reference plane may be selectively the yz plane where the second illuminating wafer 114 is located, and the encapsulant 120 may be selectively mirror symmetrical to the first reference plane, but the present invention does not Limited.

In an embodiment of the invention, the arcuate 124 has an arcuate top 124a. In the case where the end product is horizontally oriented, the light-emitting center of the encapsulant 120 is preferably It is substantially coincident with the center of the second illuminating wafer 114, that is, the arc top perpendicular line L1 and the arc top 124a to the second illuminating wafer 114 are substantially coincident with each other. However, it is preferable that the light-emitting center of the encapsulant 120 is slightly offset from the second light-emitting wafer 114 when the end product is higher than the user's direct viewing level. Preferably, the angle between the arc top perpendicular line L1 and the arc top 124a to the second light emitting chip 114 may be between 0 degrees and 20 degrees to appropriately correct the difference in deviation caused by the height difference.

In addition, the angle of deviation of the arc top 124a from the first illuminating wafer 112 should be properly tuned to achieve better coordination between heat dissipation and angular deviation of the wafer. Specifically, in an embodiment of the invention, the angle θ 1 between the arc top perpendicular line L1 and the arc top 124a to the first light emitting chip 112 line L2 and the arc top perpendicular line L1 are connected to the arc top 124a to the third light emitting chip 116. The angle θ 1 of L3 can be less than 70 degrees, respectively.

In the present invention, the arcuate body 120A has a uniaxial curvature change. In particular, a movable reference plane is parallel or coincident with the first reference plane (eg, the yz plane). When the reference plane (eg, the yz plane or a plane parallel to the yz plane) is continuously translated along the normal direction x, the light exiting surface 120a of the encapsulant 120 is cut by the same plane by the same plane (for example: The arc 122) shown in Fig. 1B. In particular, the plurality of orthographic projections of the arcs on the first reference plane (eg, the yz plane) may coincide without being staggered from each other. In other words, the light-emitting surface 120a of the encapsulant 120 is curved in the alignment direction y without being bent in the direction z.

The second reference plane is perpendicular to the first reference plane. The second reference plane is, for example, the normal direction x and the xz plane where the direction z is located, as in the paper plane of FIG. 1C. It is worth noting that the arc body 120A of the present invention has a uniaxial curvature change. Next, the orthographic projection of the arcuate body 120A on the second reference plane (e.g., the xz plane) is a rectangle 126 (shown in Figure 1C). From another perspective, another movable reference plane is parallel or coincident with the second reference plane (eg, the xz plane). When the reference plane (for example, the xz plane or a plane parallel to the xz plane) is continuously translated along the arrangement direction y, the light exiting surface 120a of the encapsulant 120 is a plurality of straight lines intercepted by the reference plane. In this embodiment, the second reference plane may be selectively on the xz plane where the second illuminating wafer 114 is located, and the encapsulant 120 may be selectively mirror symmetrical to the second reference plane, but the present invention does not limit.

In the present embodiment, the encapsulant 120 may further include a connection portion 120B (shown in FIG. 1A). The connecting portion 120B connects the curved body 120A and the substrate 130 and directly covers the first light emitting chip 112, the second light emitting chip 114, and the third light emitting wafer 116. The orthographic projection of the connecting portion 120B on the first reference plane (eg, the yz plane) is, for example, a rectangle 128 (shown in FIG. 1B) coupled to the arcuate 124. The orthographic projection of the connecting portion 120B on the second reference plane (e.g., the xz plane) is, for example, a rectangle 129 (shown in Figure 1C) that is coupled to the rectangle 126. In other words, the connection portion 120B of the encapsulant 120 may be a rectangular parallelepiped. However, the present invention is not limited thereto, and in other embodiments, the connecting portion 120B may also be a three-dimensional object of other suitable forms. That is, the orthographic projection of the connecting portion 120B on the first reference plane (eg, the yz plane) and the second reference plane (eg, the xz plane) need not be a rectangle, but may be other suitable shapes.

Referring to FIG. 1B, the rectangle 128 has opposing straight lines 128a and straight lines 128b. The straight line 128a and the straight line 128b are respectively located on two sides of the set of the first light emitting wafer 112, the second light emitting wafer 114, and the third light emitting wafer 116. Straight line 128a The line 128b is adjacent to the first illuminating wafer 112 and is located next to the orthographic projection of the first illuminating wafer 112 on the first reference plane (eg, the yz plane). The straight line 128a intersects the arc 122 at the reference point P. The reference point P is connected to the front projection L of the first illuminating wafer 112 on the first reference plane (for example, the yz plane). The reference line L and the straight line 128a are, for example, sandwiched by an acute angle θ, where 20 degrees ≦ θ ≦ 70 degrees, but the invention is not limited thereto.

Please refer to FIG. 1A, FIG. 1B and FIG. 1C. The light emitting element 100 of the present embodiment may optionally include a substrate 130 having a bearing surface 130a. The first luminescent wafer 112, the second luminescent wafer 114, and the third luminescent wafer 116 are disposed on the carrying surface 130a. The substrate 130 can also optionally include a light absorbing layer 132 and/or an insulating layer 134 covered by the light absorbing layer 132. The bearing surface 130a faces the first light emitting wafer 112, the second light emitting wafer 114, and the third light emitting wafer 116. The first luminescent wafer 112, the second luminescent wafer 114, and the third luminescent wafer 116 are disposed on the carrying surface 130a and exposed outside the light absorbing layer 132. In this embodiment, the light absorbing layer 132 may be black, but the invention is not limited thereto. In other embodiments, the light absorbing layer 132 may also be in other suitable colors. It is worth mentioning that if the light-emitting element 100 is used as one of the pixels of the display device, the first light-emitting chip 112, the second light-emitting chip 114, and the third light-emitting chip 116 are not illuminated, and the pixel is intended to be rendered. In the dark state, the substrate 130 is less likely to reflect external light. Thereby, the light-emitting element 100 which is a pixel of the display device can have extremely low brightness, thereby improving the display quality of the display device.

In the embodiment, the substrate 130 may further include a first electrode 131, a second electrode 133, a third electrode 135, a fourth electrode 136, and a fifth electrode 137. The second electrode 133 and the third electrode 135 are combined with the fourth electrode 136 and the fifth electrode 137 The set may be located on opposite sides of the first electrode 131, respectively. The first luminescent wafer 112, the second luminescent wafer 114, and the third luminescent wafer 116 may be fixed to the first electrode 131. The first light emitting chip 112 is electrically connected to the first electrode 131 and the second electrode 133. The second luminescent wafer 114 can be electrically connected to the third electrode 135 and the fourth electrode 136. The third light emitting chip 116 can be electrically connected to the third electrode 135 and the fifth electrode 137.

In addition, in the embodiment, the first illuminating wafer 112, the second illuminating wafer 114, and the third illuminating wafer 116 may be electrically independent of each other. Thereby, the light-emitting element 100 can separately control the light intensity of the first color light, the light intensity of the second color light, and the light intensity of the third color light, thereby providing a specific color depending on actual needs. It should be noted that the electrical relationship between the first light-emitting chip 112, the second light-emitting chip 114 and the third light-emitting chip 116, the first electrode 131, the second electrode 133, the third electrode 135, the fourth electrode 136, and the first The particular state of the five electrodes 137 and its relative relationship to the first, second, and third illuminating wafers 112, 114, 116 are intended to illustrate the invention and are not intended to limit the invention. In other embodiments, the first luminescent wafer 112, the second luminescent wafer 114, and the third luminescent wafer 116 may also be electrically connected to each other, for example, the first luminescent wafer 112, the second luminescent wafer 114, and the third luminescent wafer. 116 may be connected in parallel or in series; the states of the first electrode 131, the second electrode 133, the third electrode 135, the fourth electrode 136, and the fifth electrode 137, and the first, second, and third light emitting chips 112, 114, 116 The relative relationship between the two can also be appropriately designed.

Referring to FIG. 1A , it is worth mentioning that the light-emitting element 100 transmits the first color light emitted by the first light-emitting chip 112 and the third light through the specially designed encapsulant 120 . The third color light emitted by the optical wafer 116 can be deflected toward the optical axis X of the second light emitting wafer 114. Thereby, the overlapping area of the first color light distribution range and the second color light distribution range and the overlapping area of the third color light distribution range and the second color light distribution range can be increased, thereby improving the distribution range of the plurality of color lights in the prior art. Too much deviation from the problem. The following is evidenced by the data shown in FIG. 2 and FIG. 3A to FIG. 3C and FIG. 4A to FIG. 4C.

2 is a schematic perspective view of a light-emitting element of a comparative example. The light-emitting element 200 of FIG. 2 includes a fourth light-emitting chip 212, a fifth light-emitting chip 214, a sixth light-emitting chip 216, and an encapsulant 220. The fourth light-emitting chip 212, the fifth light-emitting chip 214, and the sixth light-emitting chip 216 are sequentially arranged along the arrangement direction y. The fourth illuminating wafer 212, the fifth illuminating wafer 214, and the sixth illuminating wafer 216 are respectively configured to emit fourth color light, fifth color light, and sixth color light. The color of the fourth color light, the color of the fifth color light, and the color of the sixth color light are different from each other. The fourth color light, the fifth color light, and the sixth color light can be mixed into white light. The encapsulant 220 covers the fourth luminescent wafer 212, the fifth luminescent wafer 214, and the sixth luminescent wafer 216. The difference between the illuminating element 200 of FIG. 2 and the illuminating element 100 of FIG. 1 is that the encapsulating body 220 of FIG. 2 does not have a special design like the encapsulant 120 of FIG. 1, and the light emitting surface 220a of the encapsulant 220 is planar.

3A to 3C respectively show light intensity distributions of the first color light emitted by the first light-emitting chip of FIG. 1 , the second color light emitted by the second light-emitting chip, and the third color light emitted by the third light-emitting chip after passing through the encapsulant. . In particular, the curve S1 of FIG. 3A, the curve S2 of FIG. 3B, and the curve S3 of FIG. 3C respectively show the light intensities in the respective viewing directions on the yz plane after the first, second, and third colors of light pass through the encapsulant 220. 4A to 4C respectively show the fourth color light and the fifth color emitted by the fourth light emitting chip of FIG. The light intensity distribution of the fifth color light emitted by the light-emitting chip and the sixth color light emitted by the sixth light-emitting chip after passing through the encapsulant. In particular, the curve S4 of FIG. 4A, the curve S5 of FIG. 4B, and the curve S6 of FIG. 4C respectively show the light intensities of the fourth, fifth, and sixth color lights in the respective viewing angle directions on the yz plane after passing through the encapsulant 220.

Comparing FIG. 4A with FIG. 4B, it can be seen that the range enclosed by the curve S4 is shifted to the left from the range enclosed by the curve S5. Comparing Fig. 4C with Fig. 4B, it can be seen that the range enclosed by the curve S6 is shifted to the right from the range enclosed by the curve S5. That is, the fourth color light and the sixth color light cannot be sufficiently mixed with the fifth color light after passing through the encapsulant 220, and a large portion of the fourth color light and a large portion of the sixth color light fall in the fifth color. Outside the range of light distribution. Therefore, if the light-emitting element 200 is used as a pixel of the display device, the display device is liable to cause color unevenness.

In contrast, the light-emitting element 100 according to an embodiment of the present invention, as compared with FIG. 3A and FIG. 3B, can be found that the range enclosed by the curve S1 mostly overlaps with the range enclosed by the curve S2. Comparing Fig. 3C with Fig. 3B, it can be found that the range enclosed by the curve S3 mostly overlaps with the range enclosed by the curve S2. That is, the first color light, the second color light, and the third color light can be distributed substantially within the same specified range by the deflection of the encapsulant 120. Therefore, if the light-emitting element 100 is used as a pixel of the display device, the display device is less likely to cause color unevenness.

FIG. 5 is a schematic diagram of a display device according to an embodiment of the present invention. Referring to FIG. 5, the display device 1000 includes a plurality of light emitting elements 100 arranged in an array. Each of the light emitting elements 100 can be used as one of the pixels of the display device 1000. Since each of the light emitting elements 100 is capable of projecting the first color light, the second color light, and the third color light to a specified Within the range, the display device 1000 is less prone to color unevenness.

In summary, the light-emitting element of the embodiment of the present invention transmits the first color light emitted by the first light-emitting chip and the third color light emitted by the third light-emitting chip to the optical axis of the second light-emitting chip through a specially designed encapsulant. fold. Thereby, the first color light, the second color light, and the third color light can be distributed substantially within the same specified range. When the light-emitting element is applied to a display device, since each of the light-emitting elements can project the first color light, the second color light, and the third color light into a specified range, the problem of color unevenness of the display device in the prior art can be obtained. improve.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

100‧‧‧Lighting elements

112‧‧‧First light-emitting chip

114‧‧‧Second light-emitting chip

116‧‧‧ Third illuminating chip

120‧‧‧Package colloid

120A‧‧‧Arc

120B‧‧‧Connecting Department

120a‧‧‧Glossy

130‧‧‧Substrate

130a‧‧‧ bearing surface

131‧‧‧First electrode

132‧‧‧Light absorbing layer

133‧‧‧second electrode

134‧‧‧Insulation

135‧‧‧ third electrode

136‧‧‧fourth electrode

137‧‧‧ fifth electrode

A-A’, B-B’‧‧‧ cut line

X‧‧‧ optical axis

X‧‧‧ normal direction of the first reference plane

y‧‧‧Arranged direction

Z‧‧‧direction

Claims (10)

A light-emitting element comprising: a substrate; a first light-emitting chip disposed on the substrate for emitting a first color light; and a second light-emitting chip disposed on the substrate for emitting a second color light; a third illuminating chip is disposed on the substrate for emitting a third color light, the first illuminating wafer, the second illuminating wafer and the third illuminating wafer are sequentially arranged along an array direction; and an encapsulant Covering the first illuminating wafer, the second illuminating wafer, and the third illuminating wafer and having a light emitting surface, wherein the encapsulant system has an arc body and a connecting portion, and the arc system has a uniaxial curvature change; The substrate includes a light absorbing layer, and the first light emitting chip, the second light emitting chip, and the third light emitting chip are exposed outside the light absorbing layer. The illuminating element of claim 1, wherein the orthographic projection of the curved body on a first reference plane is an arcuate shape, and a normal direction of the first reference plane is perpendicular to the arranging direction; wherein the connection The orthographic projection on the first reference plane is a first rectangle. The illuminating element of claim 2, wherein the arc has an arc, the first rectangle having a first line, the first line being located next to the orthographic projection of the first illuminating wafer on the first reference plane, The first line intersects the arc at a reference point, and the reference point is connected with the orthographic projection of the first illuminating chip on the first reference plane into a reference line, and the reference line has an acute angle with the first line θ, where 20 degrees ≦ θ ≦ 70 degrees. The illuminating element of claim 2, wherein the arc has an arc top perpendicular, and the angle between the arc top line and the line connecting the arc top and the second illuminating chip is between 0 degrees and 20 degrees. The illuminating element of claim 2, wherein the arc has an arc top perpendicular, an angle between the arc top perpendicular and a line connecting the arc top and the first illuminating chip, and an arc top perpendicular to the arc top The angle between the lines connecting the third illuminating wafers is less than 70 degrees. The illuminating element according to claim 1, wherein the curved body has a radius of curvature of from 2 cm to 5 cm. The light-emitting element of claim 1, wherein the substrate further comprises: a bearing surface, the first light-emitting chip, the second light-emitting chip and the third light-emitting chip are disposed on the bearing surface of the substrate, The normal direction of the bearing surface and the alignment direction are located on a first reference plane. The light-emitting element of claim 7, wherein the substrate further comprises a first electrode, and the first light-emitting chip, the second light-emitting chip and the third light-emitting chip are fixed on the first electrode. The light-emitting element of claim 1, wherein the first light-emitting chip, the second light-emitting chip, and the third light-emitting chip are electrically independent of each other. A display device comprising a plurality of light-emitting elements according to any one of claims 1 to 9, wherein the light-emitting elements are arranged in an array.