Micro light emitting diode display panel

Abstract

A micro light emitting diode display panel includes a substrate; a plurality of micro light emitting diodes arranged in columns and rows and disposed on the substrate; a driver disposed on the substrate; a plurality of first barrier walls respectively disposed between adjacent columns of the micro light emitting diodes; and a plurality of second barrier walls respectively disposed between adjacent micro light emitting diodes of the same column.

Description

TECHNICAL FIELD

[0001] The present application relates to a micro light emitting diode (microLED), and in particular, to a micro light emitting diode display panel. BACKGROUND

[0002] A micro light emitting diode (microLED, mLED or μLED) display panel is a type of flat panel display that is composed of individual microscopic light emitting diodes with a size ranging from 1 to 100 micrometers. Compared to a conventional liquid crystal display panel, a micro light emitting diode display panel has a greater contrast ratio and a faster response time, and consumes less power. Although a micro light emitting diode has the same low power consumption characteristic as an organic light emitting diode (OLED), a micro light emitting diode has a higher brightness, a higher luminous efficacy and a longer lifespan than an organic light emitting diode because it uses a III-V diode technology (e.g., gallium nitride).

[0003] A micro light emitting diode display panel nowadays usually has driver integrated circuits (ICs) disposed on a substrate. Since the height of a driver integrated circuit (e.g., 150 micrometers (μm)) is much greater than the height of a micro light emitting diode (e.g., 7 to 10 micrometers), the ratio is about 15 or greater, which limits the viewing angle of the micro light emitting diode display panel. Thus, the (vertical) vertical viewing angle is less than 90 degrees (e.g., 36 to 56 degrees), and the (horizontal) horizontal viewing angle is about 180 degrees. The difference between the vertical viewing angle and the horizontal viewing angle causes visual discomfort.

[0004] In particular, for large displays with a side length greater than the height of a person, the driver integrated circuits block part of the light emitted by the micro light emitting diodes, causing shading and thus dark stripes on the display. Furthermore, crosstalk occurs between the micro light emitting diodes.

[0005] Therefore, there is an urgent need to propose a novel mechanism to overcome the shortcomings of conventional micro light emitting diode display panels. SUMMARY

[0006] In view of the above, one of the purposes of embodiments of the present application is to propose a micro light emitting diode display panel with lighting uniformity, which can avoid visual discomfort caused by the difference in viewing angle and reduce crosstalk between micro light emitting diodes, thus having improved optical performance.

[0007] According to embodiments of the present application, a micro-LED display panel includes a substrate, micro-LEDs, drivers, first barrier walls, and second barrier walls. The micro-LEDs are arranged in columns and rows and disposed on the substrate. The drivers are disposed on the substrate. The first barrier walls are respectively disposed between adjacent columns of the micro-LEDs, and the second barrier walls are respectively disposed between adjacent micro-LEDs in the same column.

[0008] Preferably, the first barrier walls and the second barrier walls include non-transparent materials.

[0009] Preferably, the first barrier walls and the second barrier walls include non-reflective materials.

[0010] Preferably, the micro-LED display panel further includes an encapsulation layer covering each of the micro-LEDs.

[0011] Preferably, the encapsulation layer has a refractive index greater than 1.

[0012] Preferably, the first barrier walls have a height that is the same as or greater than a height of the drivers, and the second barrier walls have a height that is the same as or greater than a height of the micro-LEDs.

[0013] Preferably, the first barrier walls have a height that is greater than a height of the second barrier walls.

[0014] Preferably, a ratio of the height of the first barrier walls to the height of the second barrier walls is the same as a ratio of the height of the drivers to the height of the micro-LEDs.

[0015] Preferably, the second barrier walls and the first barrier walls are sequentially coated, and the first barrier walls overlap the second barrier walls.

[0016] Preferably, the second barrier walls and the first barrier walls are coated using a dispenser, a jet printer, or photolithography technology.

[0017] Preferably, the first barrier walls and the second barrier walls are simultaneously coated and do not overlap each other.

[0018] Preferably, the first barrier walls and the second barrier walls are coated using a mold.

[0019] Preferably, the micro-LEDs in a region adjacent to the drivers are asymmetrically arranged compared to the micro-LEDs outside the region.

[0020] Preferably, the region is adjacent to an upper end of the drivers, the region includes at least two columns of the micro-LEDs, and the micro-LEDs in the region are upwardly offset compared to the micro-LEDs outside the region.

[0021] Preferably, the micro-LEDs emit light against the substrate, thereby forming an upward-lighting display panel.

[0022] By means of the above technical solution, the micro light emitting diode display panel has at least the following advantages and effects: the micro light emitting diode display panel can avoid visual discomfort caused by viewing angle difference, and reduce light interference between micro light emitting diodes, thereby having improved optical performance. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 A top view of a micro light emitting diode display panel according to an embodiment of the present application is shown.

[0024] Figure 2 A cross-sectional view of the micro light emitting diode display panel along Figure 1 cross-sectional line 2-2'.

[0025] Figure 3 A cross-sectional view of the micro light emitting diode display panel along Figure 1 cross-sectional line 3-3'.

[0026] Figure 4A A cross-sectional view of the micro light emitting diode display panel along Figure 1 cross-sectional line 4-4'.

[0027] Figure 4B Another cross-sectional view of the micro light emitting diode display panel along Figure 1 cross-sectional line 4-4'.

[0028] Figure 4C A schematic view of a mold for coating the first barrier wall and the second barrier wall is shown.

[0029] Figure 5 A top view of a micro light emitting diode display panel according to an embodiment of the present application is shown.

[0030]

MAIN ELEMENT SYMBOL EXPLANATION

[0031] 100: micro light emitting diode display panel 10: substrate

[0032] 101: region 11: micro light emitting diode

[0033] 111: encapsulation layer 12: driver

[0034] 13: first barrier wall 14: second barrier wall

[0035] X: axial direction Y: axial direction DETAILED DESCRIPTION

[0036] Figure 1 A top view of a micro light emitting diode (micro LED) display panel 100 according to an embodiment of the present application is shown.

[0037] In this embodiment, the micro-light-emitting diode display panel 100 may include a plurality of micro-light-emitting diodes 11 arranged in columns and rows (i.e., in an array) and disposed on the substrate 10. The substrate 10 may be a transparent substrate, such as a glass substrate. Figure 1 Each microLED 11 shown in the following figures may represent a single microLED or may include multiple (sub-) microLEDs (e.g., a red sub-LED, a green sub-LED, and a blue sub-LED). In one embodiment, the microLED display panel 100 is a top-emission display panel that emits light upwards or in the opposite direction to the substrate 10. The microLED display panel 100 may include at least one driver 12, such as an integrated circuit, disposed on the substrate 10. In this embodiment, passive matrix addressing or a driving mechanism is used to drive the microLEDs 11.

[0038] According to one feature of this embodiment, the micro-light-emitting diode display panel 100 may include a plurality of first barrier walls 13, respectively disposed between adjacent columns of micro-light-emitting diodes 11 and disposed on the substrate 10. The first barrier walls 13 are used to block light and may contain an opaque material. In one embodiment, the first barrier walls 13 may further contain a nonreflective material.

[0039] like Figure 1 As illustrated, the first barrier wall 13 is arranged laterally along a first direction (e.g., the X-axis) and is separated by columns of micro-light-emitting diodes 11. Furthermore, the first barrier wall 13 is parallel to the driver 12 and is also arranged laterally (e.g., along the X-axis). In this embodiment, the first barrier wall 13 may or may not cover the driver 12.

[0040] Figure 2 Display along Figure 1 A cross-sectional view of the micro-light-emitting diode display panel 100, with a cross-sectional line 2-2'. (See figure) Figure 2 As illustrated, each micro-LED 11 may be covered by at least one encapsulation layer 111, which may have a circular, elliptical, or rectangular outline. In this embodiment, the encapsulation layer 111 has a refractive index greater than 1. The outline of the first barrier 13 (e.g., circular, elliptical, or rectangular) may be compatible with the outline of the encapsulation layer 111. In this embodiment, the height of the first barrier 13 is the same as or greater than the height of the driver 12. Preferably, the height of the first barrier 13 is compatible with the height of the driver 12. For example, the height of the driver 12 is 150 micrometers, and the height of the first barrier 13 is 150–200 micrometers.

[0041] Figure 3 Display along Figure 1A cross-sectional view of the micro-LED display panel 100 along the cross-sectional line 3-3'. According to another feature of the present embodiment, referring to Figure 1 With Figure 3 , the micro-LED display panel 100 of the present embodiment can include a plurality of second barrier walls 14 respectively disposed between adjacent micro-LEDs 11 of the same column and on the substrate 10. The second barrier walls 14 are used to block light and can include an opaque material. In an embodiment, the second barrier walls 14 can further include a non-reflective material. Generally, the orientations of the first barrier walls 13 and the second barrier walls 14 can be determined according to the viewing angle requirement or / and the orientation of the driver 12. The profile (e.g. circular, elliptical or rectangular) of the second barrier walls 14 can be compatible with the profile of the encapsulation layer 111. In order not to hinder the light emission of the micro-LEDs 11, the second barrier walls 14 do not cover the micro-LEDs 11.

[0042] The height of the first barrier walls 13 is much greater than the height of the second barrier walls 14. In an embodiment, the height ratio of the first barrier walls 13 to the second barrier walls 14 is approximately the same as the height ratio of the driver 12 to the micro-LEDs 11.

[0043] In the present embodiment, the height of the second barrier walls 14 is the same as or greater than the height of the micro-LEDs 11. Preferably, the height of the second barrier walls 14 is compatible with the height of the micro-LEDs 11. For example, the height of the micro-LEDs 11 is 7-10 microns, and the height of the second barrier walls 14 is 10-20 microns.

[0044] Figure 4A A cross-sectional view of the micro-LED display panel 100 along the cross-sectional line 4-4'. Referring to Figure 1 A cross-sectional view of the micro-LED display panel 100 along the cross-sectional line 4-4'. Referring to Figure 1 With Figure 4A , the second barrier walls 14 are longitudinally (e.g. along the Y-axis) disposed between adjacent micro-LEDs 11 of the same row on the substrate 10. Then, the first barrier walls 13 are transversely (e.g. along the X-axis) disposed between adjacent micro-LEDs 11 of the same column on the substrate 10 and between adjacent second barrier walls 14. In an embodiment, the second barrier walls 14 and the first barrier walls 13 are sequentially coated using a dispenser or an inkjet. In another embodiment, the second barrier walls 14 and the first barrier walls 13 are sequentially coated using a photolithography technique, which can form the second barrier walls 14 and the first barrier walls 13 more accurately than the dispenser or the inkjet. In any case, the total height in the overlapping area (of the second barrier walls 14 and the first barrier walls 13) is the sum of the height of the second barrier walls 14 and the height of the first barrier walls 13.

[0045] Figure 4B A cross-sectional view of the micro-LED display panel 100 along the cross-sectional line 4-4'. Referring to Figure 1Another cross-sectional view of the micro-LED display panel 100 along line 4-4'. See also Figure 1 and Figure 4B The first barrier wall 13 and the second barrier wall 14 are simultaneously (without overlap) coated on the substrate 10. In one embodiment, a method such as... Figure 4C The mold shown has recesses to fill with a non-transparent material, and a first barrier wall 13 and a second barrier wall 14 are simultaneously coated in a molding process.

[0046] In the above embodiments, the micro-light-emitting diodes 11 along one or more directions do not need to be arranged symmetrically. Figure 5 This image shows a top view of a micro-light-emitting diode (LED) display panel 100 according to an embodiment of the present invention. According to another feature of this embodiment, the micro-light-emitting diodes 11 located in region 101 adjacent to the driver 12 can be arranged asymmetrically compared to the micro-light-emitting diodes 11 outside region 101. For example... Figure 5 As illustrated, region 101 adjacent to the upper end of driver 12 includes two (partial) rows of micro-LEDs 11. Compared to the micro-LEDs 11 outside region 101, the micro-LEDs 11 within region 101 are offset upwards, the offset distance of which can be determined according to viewing angle requirements and / or the resolution of the display. In one embodiment, compared to the micro-LEDs 11 outside region 101, the top row of micro-LEDs 11 within region 101 is offset upwards by 50–100 micrometers, while the bottom row of micro-LEDs 11 within region 101 is offset upwards by 50–150 micrometers.

[0047] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A micro-light-emitting diode display panel, characterized in that, Include: substrate; Multiple micro light-emitting diodes are arranged in columns and rows on the substrate; The driver is located on the substrate; Multiple first barrier walls are respectively disposed between adjacent columns of micro light-emitting diodes and parallel to the driver; and Multiple second barrier walls are respectively set between adjacent micro light-emitting diodes in the same column; The height of the first barrier wall is greater than the height of the second barrier wall.

2. The micro-light-emitting diode display panel according to claim 1, characterized in that, The first barrier and the second barrier are made of non-transparent material.

3. The micro-light-emitting diode display panel according to claim 2, characterized in that, The first barrier and the second barrier are made of non-reflective material.

4. The micro-light-emitting diode display panel according to claim 1, characterized in that, It also includes: The encapsulation layer covers each micro LED.

5. The micro-light-emitting diode display panel according to claim 4, characterized in that, The refractive index of the encapsulation layer is greater than 1.

6. The micro-light-emitting diode display panel according to claim 1, characterized in that, The height of the first barrier wall is the same as or greater than the height of the driver, and the height of the second barrier wall is the same as or greater than the height of the micro LED.

7. The micro-light-emitting diode display panel according to claim 6, characterized in that, The height ratio of the first barrier wall to the second barrier wall is the same as the height ratio of the driver to the micro-LED.

8. The micro-light-emitting diode display panel according to claim 1, characterized in that, The second barrier wall is applied sequentially to the first barrier wall, and the first barrier wall overlaps the second barrier wall.

9. The micro-light-emitting diode display panel according to claim 8, characterized in that, The second barrier wall and the first barrier wall are coated using a dispensing machine, inkjet printer or photolithography.

10. The micro-light-emitting diode display panel according to claim 1, characterized in that, The first barrier wall and the second barrier wall were coated simultaneously and there was no overlap between them.

11. The micro-light-emitting diode display panel according to claim 10, characterized in that, The first barrier wall and the second barrier wall are coated using a mold.

12. The micro-light-emitting diode display panel according to claim 1, characterized in that, The micro-LEDs in the region adjacent to the driver are arranged asymmetrically compared to the micro-LEDs outside the region.

13. The micro-light-emitting diode display panel according to claim 12, characterized in that, The region is adjacent to the upper end of the driver and contains at least two rows of micro LEDs, which are offset upwards compared to the micro LEDs outside the region.

14. The micro-light-emitting diode display panel according to claim 1, characterized in that, The micro LED emits light against the substrate, thus forming an upper-emitting display panel.

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