CN113675313B - Display pixel structure - Google Patents
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- CN113675313B CN113675313B CN202110954606.9A CN202110954606A CN113675313B CN 113675313 B CN113675313 B CN 113675313B CN 202110954606 A CN202110954606 A CN 202110954606A CN 113675313 B CN113675313 B CN 113675313B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/44—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the coatings, e.g. passivation layer or anti-reflective coating
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/15—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components with at least one potential-jump barrier or surface barrier specially adapted for light emission
- H01L27/153—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components with at least one potential-jump barrier or surface barrier specially adapted for light emission in a repetitive configuration, e.g. LED bars
- H01L27/156—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components with at least one potential-jump barrier or surface barrier specially adapted for light emission in a repetitive configuration, e.g. LED bars two-dimensional arrays
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements
- H01L33/507—Wavelength conversion elements the elements being in intimate contact with parts other than the semiconductor body or integrated with parts other than the semiconductor body
Abstract
The invention discloses a display pixel structure which comprises a first blue light micro light-emitting diode, a first transparent protective layer, a first transparent trapezoidal columnar structure and a plurality of color conversion films. The first transparent protective layer coats the first blue light micro light-emitting diode, the first transparent trapezoidal columnar structure is provided with a top surface, a bottom surface and a plurality of inclined surfaces, and the bottom surface of the first transparent trapezoidal columnar structure is arranged on the first transparent protective layer. All the color conversion films are respectively arranged on the inclined surface of the first transparent trapezoidal columnar structure, and the first blue light micro light-emitting diode emits first blue light. The first blue light is emitted from the top surface of the first transparent trapezoid columnar structure after passing through the first transparent protective layer and the first transparent trapezoid columnar structure, and the color conversion film converts the first blue light into red light and green light and converges the light-emitting angle.
Description
Technical Field
The present invention relates to a display structure, and more particularly, to a display pixel structure.
Background
Light emitting diodes are considered as a new generation of display technology, and the next generation of display technology dominates. A large number of manufacturers at home and abroad attack each other strongly, and the market prospect is well received. The light emitting diodes have a pitch of the order of micrometers, high brightness, low power consumption, ultra-high resolution and color saturation. The greatest advantage of the led comes from its greatest feature, where each pixel can be addressed and driven to emit light at a single point.
The micro-leds can improve the image quality, and are a next-generation revolutionary display technology, but the current technology is still not mature enough. For example, there are many problems in the technical solution of red, green and blue chips, which are caused by the problems of low yield of red chips, high cost, and low tolerance of each chip to wavelength deviation, and meanwhile, the aging mechanisms of red, green and blue chips are inconsistent, and color shift is easily generated during the use process. In addition, the light field pattern of the micro-leds is mostly Lambertian, and the range of the light-emitting angle is large, resulting in low resolution and low color saturation.
Therefore, the present invention provides a display pixel structure to solve the above problems.
Disclosure of Invention
The invention provides a display pixel structure, which converges a large light-emitting angle of a micro light-emitting diode and increases resolution and color saturation.
In an embodiment of the present invention, a display pixel structure includes a first blue micro led, a first transparent passivation layer, a first transparent trapezoidal pillar structure, and a plurality of color conversion films. The first transparent protective layer coats the first blue light micro light-emitting diode, the first transparent trapezoidal columnar structure is provided with a first top surface, a first bottom surface and a plurality of first inclined surfaces connected between the first top surface and the first bottom surface, and the first bottom surface of the first transparent trapezoidal columnar structure is arranged on the first transparent protective layer. All the color conversion films are respectively arranged on all the first inclined surfaces of the first transparent trapezoidal columnar structures. The first blue light micro light emitting diode is used for emitting first blue light, the first blue light is emitted from the first top surface of the first transparent trapezoidal columnar structure after passing through the first transparent protective layer and the first transparent trapezoidal columnar structure, and the color conversion film converts the first blue light into red light and green light.
In an embodiment of the invention, an exit angle of the first blue light with respect to the first top surface of the first transparent trapezoid-shaped columnar structure is 20 to 50 degrees.
In an embodiment of the invention, the light exit angles of the red light and the green light relative to all the first inclined surfaces of the first transparent trapezoidal columnar structure are 35 to 45 degrees.
In an embodiment of the invention, the color conversion film is a quantum dot film.
In an embodiment of the invention, the color conversion films include two blue-green conversion films and two blue-red conversion films, the number of all the first inclined surfaces of the first transparent trapezoidal columnar structure is four, the two blue-green conversion films are opposite to each other, and the two blue-red conversion films are opposite to each other.
In an embodiment of the invention, the display pixel structure further includes a second blue micro light emitting diode, a second transparent passivation layer, a second transparent trapezoidal pillar structure, and a plurality of blue-green conversion films. The second transparent protective layer coats the second blue micro light-emitting diode. The second transparent trapezoidal columnar structure is provided with a second top surface, a second bottom surface and a plurality of second inclined surfaces connected between the second top surface and the second bottom surface. The second transparent trapezoidal column structure is arranged on the second transparent protective layer, and the second transparent trapezoidal column structure and the first transparent trapezoidal column structure are arranged in a straight line. All the blue-green conversion films are respectively arranged on all the second inclined surfaces and the second top surfaces of the second transparent trapezoidal columnar structures. The second blue light micro light emitting diode is used for emitting second blue light, and after the second blue light passes through the second transparent protective layer and the second transparent trapezoidal columnar structure, all the blue-green conversion films convert the second blue light into green light.
In an embodiment of the invention, the blue-green conversion film is a quantum dot film.
In an embodiment of the invention, the display pixel structure further includes a third blue micro-light emitting diode, a third transparent passivation layer and a third transparent trapezoidal pillar structure. The third transparent protection layer coats the third blue micro light emitting diode, and the third transparent trapezoidal columnar structure is provided with a third top surface, a third bottom surface and a plurality of third inclined surfaces connected between the third top surface and the third bottom surface. The third transparent trapezoidal column structure, the second transparent trapezoidal column structure and the first transparent trapezoidal column structure are arranged in an L shape. The third blue light micro light emitting diode is used for emitting third blue light, and the third blue light is emitted from all third inclined surfaces and third top surfaces of the third transparent trapezoidal columnar structure after passing through the third transparent protective layer and the third transparent trapezoidal columnar structure.
In an embodiment of the invention, the display pixel structure further includes a fourth blue micro-light emitting diode, a fourth transparent passivation layer, a fourth transparent trapezoidal pillar structure, and a plurality of blue-red conversion films. The fourth transparent protective layer coats the fourth blue micro light-emitting diode, and the fourth transparent trapezoidal columnar structure is provided with a fourth top surface, a fourth bottom surface and a plurality of fourth inclined surfaces connected between the fourth top surface and the fourth bottom surface. The fourth bottom surface of the fourth transparent trapezoidal columnar structure is arranged on the fourth transparent protective layer, wherein the fourth transparent trapezoidal columnar structure, the third transparent trapezoidal columnar structure, the second transparent trapezoidal columnar structure and the first transparent trapezoidal columnar structure are arranged in a square array. All the blue-red conversion films are respectively arranged on all the fourth inclined surfaces and the fourth top surfaces of the fourth transparent trapezoidal columnar structures. The fourth blue light micro light emitting diode is used for emitting fourth blue light, and after the fourth blue light passes through the fourth transparent protective layer and the fourth transparent trapezoidal columnar structure, all the blue-red conversion films convert the fourth blue light into red light.
In an embodiment of the invention, the blue-red conversion film is a quantum dot film.
Based on the above, the display pixel structure utilizes the transparent trapezoidal pillar structure to converge the large light-emitting angle of the micro-led, and combines with the color conversion film to increase the resolution and the color saturation.
Drawings
Fig. 1 is a cross-sectional view of a display pixel structure corresponding to a first blue micro light emitting diode according to an embodiment of the invention.
Fig. 2 is a top view of a display pixel structure according to an embodiment of the invention.
Fig. 3 is a schematic diagram of the pixel structure with three primary colors arranged in Pentile.
Fig. 4 is a schematic view of three primary color pixel structures arranged in diamond form according to the present invention.
Fig. 5 is a schematic diagram of the Delta arrangement of the pixel structures of the three primary colors according to the present invention.
Fig. 6 is a luminance distribution diagram of the display pixel structure according to the present invention.
The reference signs are:
100 method 8230and display pixel structure
110 \ 8230and the first blue light micro LED
111-8230and the first transparent protective layer
112, 8230a first transparent trapezoidal columnar structure
113 \ 8230and color conversion film
1130\8230ablue-green conversion film
1131, 8230a blue-red conversion film
120 \ 8230and second blue light micro LED
121 deg.8230a second transparent protective layer
122 \ 8230and a second transparent trapezoidal columnar structure
123' \ 8230and blue-green conversion film
130 \ 8230and third blue light micro LED
131,8230a third transparent protective layer
132 \ 8230and a third transparent trapezoidal column structure
133 \ 8230and flexible circuit board
140 \ 8230and fourth blue light micro LED
141 \ 8230and a fourth transparent protective layer
142 < 8230 >, fourth transparent trapezoidal columnar structure
143 \ 8230and blue-red conversion film
20 \ 8230and red pixel
21 \ 8230and green picture element
22 \ 8230and blue pixel
Detailed Description
Embodiments of the invention will be further illustrated by the following description in conjunction with the associated drawings. Wherever possible, the same reference numbers will be used throughout the drawings and the description to refer to the same or like parts. In the drawings, the shape and thickness may be exaggerated for simplicity and convenience. It is to be understood that elements not specifically shown in the drawings or described in the specification are in a form known to those skilled in the art. Many variations and modifications may be made by one of ordinary skill in the art in light of the teachings of the present invention.
When an element is referred to as "in 8230that", it can generally be understood that the element is directly on the other element or that the other element is present in both. In contrast, when an element is referred to as being "directly on" another element, it is not intended that the other element be present between the two elements. As used herein, the term "and/or" includes any combination of one or more of the associated listed items.
Reference will now be made in detail to "one embodiment" or "an embodiment" of the present invention, which refers to a particular element, structure, or characteristic described in connection with at least one embodiment. Thus, the appearances of the phrase "one embodiment" or "an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
The disclosure has been described with respect to the following examples, which are intended to be illustrative only, since various modifications and changes may be made by those skilled in the art without departing from the spirit and scope of the disclosure, the scope of which is defined in the appended claims. Throughout the specification and claims, unless the context clearly dictates otherwise, the words "a" and "an" include the word "a" and "an" and "the" include "one or at least one" of the element or constituent. Furthermore, as used in this disclosure, the singular articles "a", "an", and "the" include plural referents unless the context clearly dictates otherwise. Also, as used in this description and throughout the claims that follow, the meaning of "in" may include "in" and "on" unless the content clearly dictates otherwise. The term (terms) used throughout the specification and claims, unless otherwise indicated, has the ordinary meaning as commonly understood by one of ordinary skill in the art, in the context of this disclosure, and in the specific context. Certain terms used to describe the disclosure are discussed below or elsewhere in this specification to provide additional guidance to the practitioner (practioner) regarding the description of the disclosure. The use of examples anywhere throughout the specification, including any examples of words discussed herein, is intended merely to be illustrative, and certainly not to limit the scope or meaning of the disclosure or any exemplary words. As such, the present disclosure is not limited to the various embodiments set forth in this specification.
It is understood that as used herein, the terms "comprising," "including," "having," "containing," "involving," and the like are open-ended, i.e., meaning including but not limited to. Moreover, not all objects, advantages, or features disclosed herein are necessarily achieved in any one embodiment or claim of the present invention. In addition, the abstract and the title of the invention are provided to assist the searching of the patent document and are not intended to limit the scope of the invention.
As used herein, the term "substantially", "about" or "approximately" shall mean substantially within 20%, preferably within 10%, of a given value or range. Moreover, the quantities provided herein can be approximate, meaning that the terms "about", "approximately", or "approximately" can be used unless otherwise indicated. When an amount, concentration, or other value or parameter is given a range, preferred range or table listing desirable or less than desirable, it is to be understood that all ranges subsumed by any pair of upper and lower limits or desirable are expressly disclosed, regardless of whether ranges are separately disclosed. For example, if a range of lengths from X centimeters to Y centimeters is disclosed, it should be considered that lengths of H centimeters are disclosed and H can be any real number between X and Y.
Unless specifically stated otherwise, some conditional phrases or words, such as "can", "probably" (result) "," maybe (light) ", or" may ", are generally intended to convey that the embodiments of the present invention have, but may also be interpreted as having, features, elements, or steps that may not be required. In other embodiments, these features, elements, or steps may not be required.
The micro-leds have two advantages of the lcd and the oled, and are considered as a new generation display technology, and most of the current development stages are how to achieve mass production. The light field of the micro-leds is mostly Lambertian, and the micro-leds are used in image displays, such as color conversion films, array lenses or funnel arrays, which need to be matched. The blue-light color conversion film is matched with the structural array, and has the advantages of converging the large-angle light emission of the micro light-emitting diode, improving the resolution and the color saturation and the like. The blue color conversion film is made of quantum dot materials capable of releasing red and green spectrums into a film, and when the film is irradiated by blue light, the film and the originally irradiated blue light can form red, green and blue lights with independent spectrums and extremely narrow bandwidths. Compared with the frequency spectrum of a white light emitting diode, the frequency spectrum of the white light emitting diode has absolutely excellent red, green and blue independent frequency spectrums by matching a blue light emitting diode with a quantum dot film. The quantum dots can be regarded as new generation quantum fluorescent powder by the photoluminescence, and the quantum dots absorb high-energy backlight light sources such as blue light and ultraviolet light and are converted into high-purity red light or green light through the internal energy level of the quantum dots. Compared with the wide peak color light generated by the traditional micron fluorescent powder, such as yellow YAG fluorescent powder, the color filter is required to filter the mixed color light except red and green light, so that the requirements of the display of the three primary color light of red, green and blue are met.
The present invention provides a display pixel structure, which utilizes a transparent trapezoidal pillar structure to converge the large light-emitting angle of the micro-led and combines with a color conversion film to increase the resolution and the color saturation.
Fig. 1 is a cross-sectional view of a display pixel structure according to an embodiment of the invention. Fig. 2 is a top view of a display pixel structure according to an embodiment of the invention. Referring to fig. 1 and fig. 2, the display pixel structure 100 includes a first blue micro light emitting diode 110, a first transparent passivation layer 111, a first transparent trapezoidal pillar structure 112, and a plurality of color conversion films 113. The material of the first transparent protection layer 111 may be a transparent plastic material such as ethylene vinyl acetate or polyethylene terephthalate, but the invention is not limited thereto, wherein the ethylene vinyl acetate may be hot-pressed. The first transparent trapezoid pillar structure 112 can be made of a transparent material such as polycarbonate, polymethyl methacrylate, or BK7 glass, and is manufactured by a roll-to-roll process, but the invention is not limited thereto. The first transparent protection layer 111 covers the first blue micro-led 110, the first transparent trapezoidal pillar structure 112 has a first top surface, a first bottom surface and a plurality of first inclined surfaces connected between the first top surface and the first bottom surface, and the first bottom surface of the first transparent trapezoidal pillar structure 112 is disposed on the first transparent protection layer 111.
All the color conversion films 113 are respectively disposed on all the first inclined surfaces of the first transparent trapezoidal pillar structure 112. The first blue micro-led 110 is configured to emit a first blue light, the first blue light is emitted from the first top surface of the first transparent trapezoidal pillar structure 112 after passing through the first transparent protective layer 111 and the first transparent trapezoidal pillar structure 112, and the color conversion film 113 converts the first blue light into a red light and a green light, so that the emitted first blue light, the red light and the green light form a white light. Specifically, all the color conversion films 113 may include two blue-green conversion films 1130 and two blue-red conversion films 1131, the number of all the first inclined surfaces of the first transparent trapezoidal pillar structure 112 is four, the positions of the two blue-green conversion films 1130 are opposite to each other, and the positions of the two blue-red conversion films 1131 are opposite to each other, but the positions of the two blue-green conversion films 1130 and the two blue-red conversion films 1131 are not limited by the present invention. The blue-green conversion film 1130 converts blue light into green light, and the blue-red conversion film 1131 converts blue light into red light. In addition, all the color conversion films 113 may be quantum dot films, and the quantum dot films may be formed on all the first inclined surfaces of the first transparent trapezoidal pillar structure 112 by using a spraying technique or a three-dimensional lamination technique. If the spraying technique is adopted, the quantum dot film can be directly sprayed on all the first inclined surfaces of the first transparent trapezoidal columnar structure 112. If the three-dimensional lamination technique is adopted, the quantum dot film can be formed on a transparent adhesive film at a predetermined position, and then the transparent adhesive film is laminated on all the first inclined surfaces and the first top surfaces of the first transparent trapezoidal columnar structures 112, so that the quantum dot film is located on all the first inclined surfaces of the first transparent trapezoidal columnar structures 112. In a preferred embodiment, the first top surface and the first bottom surface of the first transparent trapezoid-shaped pillar structure 112 can be both square, wherein the ratio of the side length of the first top surface to the height of the first transparent trapezoid-shaped pillar structure 112 to the side length of the first bottom surface is substantially 1.8:3.5:4, but the present invention is not limited thereto. In order to converge the large-angle light emission of the first blue micro led 110 to increase the resolution and the color saturation, according to the snell's law, the first transparent trapezoidal pillar structure 112 may be designed such that the light emission angle of the first blue light with respect to the first top surface of the first transparent trapezoidal pillar structure 112 is 20 to 50 degrees. Similarly, the angles of the first inclined surfaces of the first transparent trapezoidal pillar structure 112 can be designed such that the light emitting angles of the red light and the green light with respect to all the first inclined surfaces of the first transparent trapezoidal pillar structure 112 are 35 to 45 degrees, but the invention is not limited to the angles. The lines in the figure represent the light exit traces.
The display pixel structure 100 may further include a second blue micro light emitting diode 120, a second transparent passivation layer 121, a second transparent trapezoidal pillar structure 122, and a plurality of blue-green conversion films 123. The material of the second transparent protection layer 121 may be a transparent plastic material such as ethylene vinyl acetate or polyethylene terephthalate, but the invention is not limited thereto, wherein the ethylene vinyl acetate may be made by hot pressing. The second transparent trapezoid-shaped pillar structure 122 can be made of a transparent material such as polycarbonate, polymethyl methacrylate, or BK7 glass, and is roll-to-roll processed, but the invention is not limited thereto. The second transparent passivation layer 121 covers the second blue micro led 120. The second transparent trapezoid pillar 122 has a second top surface, a second bottom surface and a plurality of second inclined surfaces connected between the second top surface and the second bottom surface. The second bottom surface of the second transparent trapezoidal pillar structure 122 is disposed on the second transparent passivation layer 121, wherein the second transparent trapezoidal pillar structure 122 and the first transparent trapezoidal pillar structure 112 may be arranged in a straight line.
All the blue-green conversion films 123 are respectively disposed on all the second inclined surfaces and the second top surfaces of the second transparent trapezoidal pillar structures 112. The second blue micro led 120 is configured to emit a second blue light, and after the second blue light passes through the second transparent passivation layer 121 and the second transparent trapezoid-shaped columnar structure 122, all the blue-green conversion films 123 convert the second blue light into a green light. In addition, all the blue-green conversion films 123 may be quantum dot films, and the quantum dot films may be formed on all the second inclined surfaces and the second top surfaces of the second transparent trapezoidal pillar structures 122 by a spraying technique or a three-dimensional bonding technique. If the spraying technique is adopted, the quantum dot film can be directly sprayed on all the second inclined surfaces and the second top surfaces of the second transparent trapezoidal columnar structures 122. If the three-dimensional bonding technique is adopted, the quantum dot film may be formed on a transparent adhesive film at a predetermined position, and then the transparent adhesive film is bonded on all the second inclined surfaces and the second top surfaces of the second transparent trapezoidal pillar structures 122, so that the quantum dot film is located on all the second inclined surfaces and the second top surfaces of the second transparent trapezoidal pillar structures 122. In a preferred embodiment, the second top surface and the second bottom surface of the second transparent trapezoidal pillar structure 122 may be both square, wherein the ratio of the side length of the second top surface to the height of the second transparent trapezoidal pillar structure 122 to the side length of the second bottom surface is substantially 1.8:3.5:4, but the present invention is not limited thereto. In order to converge the large-angle light emission of the second blue micro led 120 to increase the resolution and the color saturation, according to the snell's law, the second transparent trapezoidal pillar structure 122 can be designed such that the light emission angle of the green light with respect to the second top surface of the second transparent trapezoidal pillar structure 122 is 20 to 50 degrees. Similarly, the angles of the second inclined surfaces of the second transparent trapezoidal pillar structures 122 can also be designed such that the light-emitting angles of the green light with respect to all the second inclined surfaces of the second transparent trapezoidal pillar structures 122 are 35 to 45 degrees, but the invention is not limited to the angles. The lines in the figure represent the light exit traces.
The display pixel structure 100 may further include a third blue micro light emitting diode 130, a third transparent passivation layer 131 and a third transparent trapezoidal pillar structure 132. The third transparent protection layer 131 may be made of a transparent plastic material such as ethylene vinyl acetate or polyethylene terephthalate, but the invention is not limited thereto, wherein the ethylene vinyl acetate may be hot-pressed. The third transparent trapezoid-shaped pillar structure 132 may be made of a transparent material such as polycarbonate, polymethyl methacrylate, or BK7 glass, and is roll-to-roll processed, but the invention is not limited thereto. The third transparent passivation layer 131 covers the third blue micro led 130, and the third transparent trapezoid-shaped pillar structure 132 has a third top surface, a third bottom surface, and a plurality of third inclined surfaces connected between the third top surface and the third bottom surface. The third bottom surface of the third transparent trapezoidal pillar 132 is disposed on the third transparent passivation layer 131, wherein the third transparent trapezoidal pillar 132, the second transparent trapezoidal pillar 122 and the first transparent trapezoidal pillar 112 are arranged in an L shape.
The third blue micro led 130 is configured to emit third blue light, and the third blue light is emitted from all third inclined surfaces and third top surfaces of the third transparent trapezoidal columnar structure 132 after passing through the third transparent protective layer 131 and the third transparent trapezoidal columnar structure 132. In a preferred embodiment, the third top surface and the third bottom surface of the third transparent trapezoidal pillar 132 can be both square, wherein the ratio of the side length of the third top surface, the height of the third transparent trapezoidal pillar 132 and the side length of the third bottom surface is substantially 1.8:3.5:4, but the present invention is not limited thereto. In order to converge the large-angle light emission of the third blue micro led 130 to increase the resolution and the color saturation, according to the snell's law, the third transparent trapezoidal pillar 132 may be designed such that the light emission angle of the blue light with respect to the third top surface of the third transparent trapezoidal pillar 132 is 20 to 50 degrees. Similarly, the angle of the third inclined surface of the third transparent trapezoidal pillar 132 may be designed such that the light-emitting angle of the blue light with respect to all the third inclined surfaces of the third transparent trapezoidal pillar 132 is 35 to 45 degrees, but the present invention is not limited to the above angle. The lines in the figure represent the light exit traces.
The display pixel structure 100 may further include a fourth blue micro light emitting diode 140, a fourth transparent passivation layer 141, a fourth transparent trapezoid pillar structure 142, and a plurality of blue-red conversion films 143. The material of the fourth transparent protection layer 141 may be a transparent plastic material such as ethylene vinyl acetate or polyethylene terephthalate, but the invention is not limited thereto, wherein the ethylene vinyl acetate may be hot-pressed. The material of the fourth transparent trapezoid-shaped pillar structure 142 may be a transparent material such as polycarbonate, polymethyl methacrylate, or BK7 glass, and a roll-to-roll process is adopted, but the invention is not limited thereto. The fourth transparent passivation layer 141 encapsulates the fourth blue micro led 140, and the fourth transparent trapezoid-shaped pillar structure 142 has a fourth top surface, a fourth bottom surface, and a plurality of fourth inclined surfaces connected between the fourth top surface and the fourth bottom surface. The fourth bottom surface of the fourth transparent trapezoidal pillar structure 142 is disposed on the fourth transparent passivation layer 141, wherein the fourth transparent trapezoidal pillar structure 142, the third transparent trapezoidal pillar structure 132, the second transparent trapezoidal pillar structure 122 and the first transparent trapezoidal pillar structure 112 are arranged in an array.
All the blue-red conversion films 143 are respectively disposed on all the fourth inclined surfaces and the fourth top surfaces of the fourth transparent trapezoidal pillar 142. The fourth blue light micro led 140 is configured to emit fourth blue light, and after the fourth blue light passes through the fourth transparent passivation layer 141 and the fourth transparent trapezoid-shaped columnar structure 142, all the blue-red conversion films 143 convert the fourth blue light into red light. In addition, all the blue-red conversion films 143 may be quantum dot films, and the quantum dot films may be formed on all the fourth inclined surfaces and the fourth top surfaces of the fourth transparent trapezoidal pillar structures 142 by using a spraying technique or a three-dimensional lamination technique. If the spraying technique is adopted, the quantum dot film can be directly sprayed on all the fourth inclined surfaces and the fourth top surfaces of the fourth transparent trapezoidal columnar structure 142. If the three-dimensional bonding technique is adopted, the quantum dot film may be formed on a transparent adhesive film at a predetermined position, and then the transparent adhesive film is bonded to all the fourth inclined surfaces and the fourth top surface of the fourth transparent trapezoidal columnar structure 142, so that the quantum dot film is located on all the fourth inclined surfaces and the fourth top surface of the fourth transparent trapezoidal columnar structure 142. In a preferred embodiment, the fourth top surface and the fourth bottom surface of the fourth transparent trapezoidal pillar 142 can be both square, wherein the ratio of the side length of the fourth top surface to the height of the fourth transparent trapezoidal pillar 142 to the side length of the fourth bottom surface is substantially 1.8:3.5:4, but the present invention is not limited thereto. In order to converge the large-angle light emission of the fourth blue micro led 140, so as to increase the resolution and the color saturation, according to the snell's law, the fourth transparent trapezoidal pillar structure 142 may be designed such that the light emission angle of the green light with respect to the fourth top surface of the fourth transparent trapezoidal pillar structure 142 is 20 to 50 degrees. Similarly, the angle of the fourth inclined surface of the fourth transparent trapezoidal pillar structure 142 can be designed to make the light-emitting angle of the red light to all the fourth inclined surfaces of the fourth transparent trapezoidal pillar structure 142 be 35 to 45 degrees, but the present invention is not limited to the above angle. The lines in the figure represent the light exit traces.
If the structures corresponding to the first blue micro led 110, the second blue micro led 120, the third blue micro led 130 and the fourth blue micro led 140 are respectively regarded as a white light device, a green light device, a blue light device and a red light device, and the four devices are regarded as a complete pixel structure, the color saturation can be improved by the square matrix.
Fig. 3 is a schematic view of the pixel structure with three primary colors arranged in Pentile. FIG. 4 is a schematic diagram of three primary color pixel structures arranged in diamond form according to the present invention. Fig. 5 is a schematic diagram of the pixel structures of three primary colors in Delta arrangement according to the present invention. Referring to fig. 3, 4 and 5, the red pixel 20, the green pixel 21 and the blue pixel 22 can respectively correspond to the red light device, the green light device and the blue light device, that is, the invention does not limit the position and area of the red light device, the green light device and the blue light device, and the red light device, the green light device and the blue light device can be implemented by Pentile arrangement, diamond arrangement or Delta arrangement.
FIG. 6 is a luminance distribution diagram of the display pixel structure according to the invention. Referring to FIG. 6, FIG. 6 shows the brightness distribution of the display pixel structures 100. It can be seen that the trapezoidal pillar structure can function as a pixel-like structure and can provide uniform brightness for the LED, unlike the pixel structure lacking the trapezoidal pillar structure.
According to the above embodiments, the display pixel structure utilizes the transparent trapezoidal pillar structure to converge the large light-emitting angle of the micro-led, and combines with the color conversion film to increase the resolution and the color saturation.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, so that equivalent variations and modifications in the shape, structure, characteristics and spirit of the present invention described in the claims should be included in the scope of the present invention.
Claims (10)
1. A display pixel structure, comprising:
a first blue micro-LED;
the first transparent protective layer coats the first blue micro light-emitting diode;
a first transparent trapezoidal columnar structure having a first top surface, a first bottom surface, and a plurality of first inclined surfaces connected between the first top surface and the first bottom surface, the first bottom surface of the first transparent trapezoidal columnar structure being disposed on the first transparent protective layer; and
the color conversion films are respectively arranged on the first inclined surfaces of the first transparent trapezoidal columnar structure, the first blue light micro light-emitting diode is used for emitting first blue light, the first blue light passes through the first transparent protective layer and the first transparent trapezoidal columnar structure and then is emitted from the first top surface of the first transparent trapezoidal columnar structure, and the color conversion films convert the first blue light into red light and green light.
2. The display pixel structure of claim 1, wherein an angle of light extraction of the first blue light with respect to the first top surface of the first transparent trapezoidal pillar structure is 20 to 50 degrees.
3. The display pixel structure of claim 1, wherein the light-exit angle of the red light and the green light relative to the first inclined surfaces of the first transparent trapezoidal pillar structure is 35-45 degrees.
4. The display pixel structure of claim 1, wherein the plurality of color conversion films are quantum dot films.
5. The display pixel structure of claim 1, wherein the plurality of color conversion films comprises two blue-green conversion films and two blue-red conversion films, the number of the first inclined surfaces of the first transparent trapezoidal pillar structure is four, the two blue-green conversion films are opposite to each other, and the two blue-red conversion films are opposite to each other.
6. The display pixel structure of claim 1, further comprising:
a second blue micro-LED;
the second transparent protective layer coats the second blue micro light-emitting diode;
a second transparent trapezoidal columnar structure having a second top surface, a second bottom surface, and a plurality of second inclined surfaces connected between the second top surface and the second bottom surface, the second bottom surface of the second transparent trapezoidal columnar structure being disposed on the second transparent protective layer, wherein the second transparent trapezoidal columnar structure and the first transparent trapezoidal columnar structure are linearly arranged; and
a plurality of blue-green conversion films are respectively arranged on the second transparent trapezoidal columnar structure, the second inclined surfaces and the second top surface are used for emitting second blue light, the second blue light passes through the second transparent protective layer and the second transparent trapezoidal columnar structure, and the second blue light is green light.
7. A display pixel structure according to claim 6, wherein the blue-green conversion film is a quantum dot film.
8. The display pixel structure of claim 6, further comprising:
a third blue micro-LED;
the third transparent protective layer coats the third blue micro light-emitting diode; and
the third transparent trapezoidal columnar structure is provided with a third top surface, a third bottom surface and connected with the third top surface and a plurality of third inclined surfaces between the third bottom surface, the third bottom surface of the third transparent trapezoidal columnar structure is arranged on the third transparent protective layer, wherein the third transparent trapezoidal columnar structure is arranged in an L shape with the first transparent trapezoidal columnar structure, the third blue light micro-light emitting diode is used for emitting third blue light, and the third blue light passes through the third transparent protective layer and the third transparent trapezoidal columnar structure, and then is output from the third transparent trapezoidal columnar structure.
9. A display pixel structure according to claim 8, further comprising:
a fourth blue micro-LED;
the fourth transparent protective layer coats the fourth blue micro light-emitting diode;
a fourth transparent trapezoidal columnar structure having a fourth top surface, a fourth bottom surface, and a plurality of fourth inclined surfaces connected between the fourth top surface and the fourth bottom surface, the fourth bottom surface of the fourth transparent trapezoidal columnar structure being disposed on the fourth transparent protective layer, wherein the fourth transparent trapezoidal columnar structure, the third transparent trapezoidal columnar structure, the second transparent trapezoidal columnar structure, and the first transparent trapezoidal columnar structure are arranged in a square matrix; and
and the blue-red conversion films are respectively arranged on the fourth inclined surfaces and the fourth top surface of the fourth transparent trapezoidal columnar structure, the fourth blue light micro light-emitting diode is used for emitting fourth blue light, and the fourth blue light passes through the fourth transparent protective layer and the fourth transparent trapezoidal columnar structure and then is converted into red light.
10. The display pixel structure of claim 9, wherein the blue-red conversion film is a quantum dot film.
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| TWI782673B (en) | 2022-11-01 |
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