KR20230097948A - Display panel and display apparatus employing the same - Google Patents

Abstract

Disclosed are a display panel and a display device employing the same. The disclosed display panel includes a substrate; a first subpixel array including first subpixels arranged in a first region on the substrate to form a first primary color image; a second subpixel array including second subpixels arranged in a second region on the substrate to form a second primary color image; and a third subpixel array including third subpixels arranged in a third region on the substrate to form a third primary color image, wherein the first to third regions are spatially separated and side by side on the same side of the substrate. The first to third subpixels are grouped by the same primary color and patterned into first to third subpixel arrays in the first to third regions, respectively.

Description

Display panel and display apparatus employing the same {Display panel and display apparatus employing the same}

The present disclosure relates to a display panel and a display device employing the same.

Recently, a micro LED display panel using a micro light emitting diode (LED) device has been actively developed. These micro LED display panels use self-luminous properties of micro LEDs to provide virtual images for use in subminiature projectors or near-eye display devices such as head-mount displays (HMD) for AR/VR. can be used to do

On the other hand, in addition to the pick and place method of transferring individual LED chips to increase the PPI (Pixels per inch) of the micro LED panel, hybrid integration using flip-chip bonding, etc. Methods such as , monolithic integration, etc. are being studied.

In addition, a color conversion technology using quantum dots (QDs) is being developed to improve color reproducibility of micro LEDs.

The problem to be solved is to provide a display panel having a structure considering the limitations of process technology and a display device employing the same.

The problem to be solved is to provide a display panel with improved color conversion efficiency and a display device employing the same.

An object to be solved is to provide a display panel capable of minimizing excitation light that is lost without being transferred to quantum dots and a display device employing the same.

The technical problem to be solved is not limited to the technical problems described above, and other technical problems may exist.

A display panel according to one aspect includes a substrate; a first subpixel array including first subpixels arranged in a first region on the substrate to form a first primary color image; a second subpixel array including second subpixels arranged in a second region on the substrate to form a second primary color image; and a third subpixel array including third subpixels arranged in a third region on the substrate to form a third primary color image, wherein the first to third regions are spatially separated and side by side on the same side of the substrate. The first to third subpixels are grouped by the same primary color and patterned into first to third subpixel arrays in the first to third regions, respectively.

In an embodiment, a spacing between the first subpixel array and the second subpixel array and a spacing between the second subpixel array and the third subpixel array may be the same as pitches of the first to third subpixel arrays.

In an embodiment, a first distance between the first subpixel array and the second subpixel array and a second distance between the second subpixel array and the third subpixel array may be greater than the pitches of the first to third subpixel arrays. there is.

In an embodiment, each of the first subpixels includes at least one first primary color light emitting device, each of the second subpixels includes at least one second primary color light emitting device, and each of the third subpixels includes at least one One third primary color light emitting device may be included.

In one embodiment, the first to third primary color light emitting devices may be a red micro LED device, a green micro LED device, and a blue micro LED device, respectively.

In one embodiment, the first primary color light emitting element includes an excitation light micro LED element, and is provided on the excitation light micro LED element to absorb excitation light emitted from the excitation light micro LED element and emit light of the first primary color. The second primary color light emitting element includes an excitation light micro LED element and a second light emitting element provided on the excitation light micro LED element to absorb excitation light emitted from the excitation light micro LED element and emit light of a second primary color. A primary color color conversion layer may be included.

In one embodiment, the excitation light is blue light, the first primary color conversion layer includes first quantum dots that absorb blue light and emit red light, and the second primary color conversion layer includes second quantum dots that absorb blue light and emit green light. may include

In one embodiment, the first primary color conversion layer may include a plurality of first quantum dot layers having different first quantum dot densities.

In one embodiment, the first quantum dot density of an upper layer among the plurality of first quantum dot layers may be smaller than the first quantum dot density of the upper layer.

In one embodiment, the excitation light is ultraviolet light, and the third primary color light emitting element is provided on the ultraviolet light micro LED element and the ultraviolet light micro LED element to absorb ultraviolet light emitted from the ultraviolet light micro LED element and emit blue light. 3 primary color color conversion layers may be included.

In one embodiment, the third primary color conversion layer may include third quantum dots that absorb ultraviolet light and emit blue light.

In an embodiment, the first primary color light emitting device may further include a first dichroic mirror layer provided on the first primary color conversion layer and reflecting excitation light passing through the first primary color conversion layer to the first primary color conversion layer. there is.

In one embodiment, the first primary color light emitting element is provided between the excitation light micro LED element and the first primary color conversion layer to convert light of the first primary color converted in the first primary color conversion layer and directed toward the excitation light micro LED element. A second dichroic mirror layer that reflects the color conversion layer may be further included.

In one embodiment, a reflective barrier rib may be provided between the first to third primary color light emitting devices.

A display device according to another aspect includes a display panel; and the first light corresponding to the first primary color image output from the first subpixel array of the display panel, the second light corresponding to the second primary color image output from the second subpixel array, and the third subpixel array. and a coupling optical system for coupling third light corresponding to the output third primary color image, wherein the display panel includes: a substrate; a first sub-pixel array including first sub-pixels arranged in a first region on a substrate and forming a first primary color image; a second sub-pixel array including second sub-pixels arranged in a second area on the substrate different from the first area and forming a second primary color image; and third sub-pixels arranged in a third area on the substrate different from the first and second areas, wherein the third sub-pixels are combined with the first and second primary color images to form a third primary color image constituting a full-color image. It includes; sub-pixel array.

In one embodiment, the combining optical system may be an image combiner that combines the first to third lights and guides them to the user's eye motion box.

In one embodiment, the image combiner is positioned to face at least one waveguide and the first to third sub-pixel arrays, respectively, and the first to third inputs couple the first to third lights to the at least one waveguide. It may include a coupler and an output coupler that outputs the first to third lights from at least one waveguide to the user's eye motion box.

In one embodiment, the at least one waveguide includes first to third waveguides for guiding first to third lights, respectively, and first to third input couplers are provided on the first to third waveguides, respectively. can

In one embodiment, among the first to third waveguides, the second waveguide may not have an area facing the first sub-pixel array, and the third waveguide may not have an area facing the first and second sub-pixel arrays. can

In one embodiment, the display device may be a virtual reality device or an augmented reality device.

In an exemplary embodiment, the combining optical system may include an X-cube prism for coupling paths of first to third lights, and a plurality of reflecting members for changing paths of first to third lights toward the X-cube prism.

In one embodiment, the combining optical system may include first to third lenses that project the first to third lights in an overlapping manner on one screen.

The disclosed display panel and display device employing the same can overcome the limitations of processing technology through a pixel layout in which subpixels are spatially separated for each primary color.

The disclosed display panel and display device employing the same can improve color conversion efficiency through a multilayer structure of quantum dots having different quantum dot densities.

The disclosed display panel and a display device employing the same can increase the ratio of excitation light absorbed by quantum dots by using a reflective partition wall structure and/or a dichroic mirror structure.

1 is a plan view schematically illustrating a pixel layout of a display panel according to an exemplary embodiment.
2 is a side view of a display panel according to an exemplary embodiment.
3A to 3E are diagrams illustrating a manufacturing process of a display panel according to an exemplary embodiment.
4 is a side view of a display panel according to an exemplary embodiment.
5A to 5F are diagrams illustrating a manufacturing process of a display panel according to an exemplary embodiment.
6 is a plan view schematically illustrating a sub-pixel arrangement of a display panel according to an exemplary embodiment.
7 is a side view of a display panel according to an exemplary embodiment.
8 is a side view of a display panel according to an exemplary embodiment.
9 shows a schematic structure of a display panel according to an embodiment.
10 is a cross-sectional side view schematically illustrating a structure of a monochromatic micro LED device according to an exemplary embodiment.
11 illustrates relative radiation emitted from the micro LED device according to the mean free path (MFP) of the lower layer when the color conversion layer of the monochromatic micro LED device according to an embodiment is a double layer (thickness: 10 μm/10 μm). It is a chart showing relative (radiant flux) in contrast to the case of the comparative example, which is a single layer.
12 is a comparative example in which the relative radiation flux emitted from the micro LED device according to the MFP of the lower layer is a single layer when the color conversion layer of the monochromatic micro LED device according to an embodiment is a double layer (thickness: 2.5 μm/2.5 μm). It is a diagram showing the case by case.
13 is a side cross-sectional view schematically illustrating a structure of a monochromatic micro LED device according to an exemplary embodiment.
14 is a side cross-sectional view schematically illustrating a structure of a monochromatic micro LED device according to an exemplary embodiment.
15 is a diagram schematically illustrating a display device according to an exemplary embodiment.
16 is a diagram schematically illustrating a display device according to an exemplary embodiment.
17 schematically illustrates an augmented reality device according to an embodiment.
18 is a diagram schematically illustrating a display device according to an exemplary embodiment.
19 is a diagram schematically illustrating a display device according to an exemplary embodiment.

Hereinafter, embodiments of the present disclosure will be described in detail so that those skilled in the art can easily practice them with reference to the accompanying drawings. However, the present disclosure may be embodied in many different forms and is not limited to the embodiments described herein. And in order to clearly describe the present disclosure in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

The terms used in the embodiments of this specification have been selected from general terms that are currently widely used as much as possible while considering the functions of the present disclosure, but they may vary depending on the intention or precedent of a person skilled in the art, the emergence of new technologies, and the like. . In addition, in a specific case, there is also a term arbitrarily selected by the applicant, and in this case, the meaning will be described in detail in the description of the corresponding embodiment. Therefore, the term used in this specification should be defined based on the meaning of the term and the overall content of the present disclosure, not a simple name of the term.

Singular expressions include plural expressions unless the context clearly dictates otherwise. In addition, when a certain component is said to "include", this means that it may further include other components without excluding other components unless otherwise stated.

In the present disclosure, 'primary color' means a single color that can be combined to form a full color, such as red, green, and blue.

Hereinafter, the present disclosure will be described in detail with reference to the accompanying drawings.

1 is a plan view schematically illustrating a pixel layout of a display panel 100 according to an exemplary embodiment.

Referring to FIG. 1 , the display panel 100 includes first to third sub-pixels 131 , 132 , and 133 provided on a substrate 110 .

The substrate 110 may be any one of a glass substrate, a flexible substrate, and a plastic substrate. The substrate 110 may include a thin film transistor (TFT) layer (not shown) and wiring (not shown) electrically connecting circuits disposed on the back side of the substrate. A plurality of first to third sub-pixels 131 , 132 , and 133 (eg, micro LED elements) are arranged on the substrate 110 in a state of being electrically connected to the TFT layer to form the first to third sub-pixels. Arrays 121, 122 and 123 are formed.

The first to third sub-pixels 131 , 132 , and 133 form first to third primary color images, and are grouped by the same primary color to be spatially separated on the substrate 110 and next to each other next to each other. The first to third subpixel arrays 121 , 122 , and 123 are patterned in the third regions R1 , R2 , and R3 . Here, patterning means that the light emitting elements (eg, micro LED elements) constituting the first to third sub-pixels 131, 132, and 133 are transferred to the substrate 110 through a process such as transfer or inkjet printing. ) means that it is placed on

The first sub-pixel array 121 includes first sub-pixels 131 arranged in the first region R1 on the substrate 110 and forms a first primary color image. Since the arrangement of the first subpixels 131 includes two or more rows and two or more columns, a first primary color image can be formed in the first subpixel array 121 . The first primary color may be, for example, any one of red, green, and blue. Each of the first sub-pixels 131 may include at least one first light emitting device and emit light corresponding to a first primary color image. Illustratively, the first light emitting device may be a red light emitting device, in which case the first sub-pixels 131 become red sub-pixels, and the first sub-pixel array 121 emits light of a red image. can

The second subpixel array 122 includes second subpixels 132 arranged in a second region R2 different from the first region R1 on the substrate 110 and forms a second primary color image. That the second region R2 is different from the first region R1 means that the first region R1 and the second region R2 are spatially separated from each other without overlapping each other. Each of the second sub-pixels 132 may include at least one second light emitting element and emit light corresponding to a second primary color image. The arrangement of the second sub-pixels 132 includes two or more rows and two or more columns, so that a second primary color image can be formed in the second sub-pixel array 122 . The second primary color may be, for example, any one of red, green, and blue. Illustratively, the second light emitting device may be a green light emitting device. In this case, the second sub-pixels 132 become green sub-pixels, and the second sub-pixel array 122 emits light of a green image. can

The third sub-pixel array 123 includes third sub-pixels 133 arranged in a third region R3 different from the first and second regions R1 and R2 on the substrate 110 and has a third primary color. form a burn The fact that the third region R3 is different from the first and second regions R1 and R2 means that the third region R3 does not overlap and is spatially separated from the first region R1 and the second region R2. means The first to third regions R1 , R2 , and R3 are positioned on the same surface of the substrate 110 . Each of the third sub-pixels 133 may include at least one third light emitting element and emit light corresponding to a third primary color image. The arrangement of the third sub-pixels 133 includes two or more rows and two or more columns, so that a third primary color image can be formed in the third sub-pixel array 123 . The third primary color may be, for example, any one of red, green, and blue. Illustratively, the third light emitting device may be a blue light emitting device. In this case, the third sub-pixels 133 become blue sub-pixels, and the third sub-pixel array 123 emits light of a blue image. can

In one embodiment, the first to third sub-pixel arrays 121, 122, and 123 may be located side by side and adjacent to each other.

In one embodiment, the first to third sub-pixels 131, 132, and 133 may all have the same size, but are not limited thereto. For example, the brightness of the first to third light emitting devices constituting the first to third subpixels 131, 132, and 133 may be different, and thus the first to third subpixels 131, 132, and 133 may have different brightness. 133) may be different in size.

In one embodiment, the pitches of the first to third subpixels 131, 132, and 133 may all be the same, but are not limited thereto.

The interval between the first sub-pixel array 121 and the second sub-pixel array 122 and the interval between the second sub-pixel array 122 and the third sub-pixel array 123 are the first to third sub-pixels. It may be the same as the pitch of (131, 132, 133), but is not limited thereto.

The first primary color image formed in the first sub-pixel array 121, the second primary color image formed in the second sub-pixel array 122, and the third primary color image formed in the third sub-pixel array 123 are They can be combined by a coupling optical system (eg, 920 in FIG. 13) to provide a full-color image. For example, the first sub-pixel array 121 forms a red image, the second sub-pixel array 122 forms a green image, the third sub-pixel array 123 forms a blue image, and so on. , a full-color image can be formed by combining green and blue images. In other words, the first sub-pixel 131 located in the first sub-pixel array 121, the second sub-pixel 132 located in the second sub-pixel array 122, and the third sub-pixel array 123 The located third sub-pixel 133, for example, as red, green and blue sub-pixels, can be combined to operate as a full-color pixel.

2 is a side view of the display panel 100 according to an exemplary embodiment. Referring to FIG. 2 , the first to third light emitting devices 141 , 142 , and 143 constituting the first to third sub-pixels 131 , 132 , and 133 emit light by themselves without a backlight. It may be a micro LED chip containing a material. In one embodiment, the micro LED chip may have a width, length, and height of 1 μm to 100 μm, respectively. For example, each of the first light emitting elements 141 is a red micro LED chip emitting red light, each of the second light emitting elements 142 is a green micro LED chip emitting green light, and Each of the light emitting elements 143 may be a blue micro LED chip emitting blue light.

Although FIG. 2 shows an empty space between the first to third light emitting devices 141, 142, and 143, a barrier rib (not shown) may be provided to prevent crosstalk. The barrier ribs are formed between the first light emitting devices 141, between the second light emitting devices 142, between the third light emitting devices 143, and between the first to third subpixel arrays 121, 122, and 123. All can be provided in between. The minimum space separated by the barrier rib may define one sub-pixel, and may be approximately 1 μm to 100 μm in width and length.

3A to 3E are diagrams illustrating a manufacturing process of the display panel 100 according to an exemplary embodiment.

As shown in FIG. 3A , the first light emitting elements 141 constituting the first sub-pixels 131 are grown and manufactured on a growth substrate 180 . In an embodiment, a wavelength band of light emitted from the light emitting element (micro LED chip) 141 may be determined according to an inorganic light emitting material constituting the micro LED chip. For example, red, green, and blue micro LED chips can be manufactured by epitaxially growing nitride semiconductors having different compositional qualities and composition ratios on different growth substrates (eg, sapphire substrates) and forming n/p electrodes. there is. The first light emitting elements 141 may be, for example, red micro LED chips.

Next, as shown in FIG. 3B, the first light emitting devices 141 formed on the growth substrate 180 are transferred to the transfer substrate 190, and as shown in FIG. 3C, using the transfer substrate 190 The first light emitting elements 141 are transferred to the first region R1 on the substrate 110 . The transfer process using the transfer substrate 190 is exemplary and does not limit the present embodiment. Transfer of the first light emitting devices 141 may be performed in units of the first sub-pixel array 121 . The transferred first light emitting elements 141 may be understood as first sub-pixels 131, and may be, for example, red micro LED chips.

As shown in FIG. 3D, the second light emitting devices 142 are also manufactured through epitaxial growth on a separate growth substrate (not shown), and second sub-pixels are formed in the second region R2 on the substrate 110. It is transferred in array 122 units. The transferred second light emitting elements 142 may be understood as second sub-pixels 132, and may be, for example, green micro LED chips.

As shown in FIG. 3E, the third light emitting elements 143 are also manufactured through epitaxial growth on a separate growth substrate (not shown), and a third subpixel is formed in the third region R3 on the substrate 110 It is transferred in array 123 units. The transferred third light emitting elements 143 may be understood as third sub-pixels 133, and may be, for example, a blue micro LED chip.

In one embodiment, the process of forming barriers (not shown) between individual light emitting devices may be performed on individual growth substrates before transfer of the first to third light emitting devices 141, 142, and 143. For example, after growing the first light emitting devices 141 on the growth substrate 180 in FIG. 3A, a process of forming barriers between the first light emitting devices 141 is performed, and then the transfer process may proceed.

In an embodiment, after the transfer of the first to third light emitting devices 141, 142, and 143 is completed, partition walls (not shown) between the individual light emitting devices or the first to third sub-pixel arrays 121, 122, 123) may be added to form partition walls (not shown).

In a conventional full-color micro LED panel, red, green, and blue micro LED chips grown on different growth substrates are separated into individual chip units and then transferred to a substrate on which a pixel circuit is formed so as to be grouped by pixel. At this time, the pixel size is determined by the area of the area where the red, green, and blue micro LED chips are gathered together. Considering the process error of the transfer process, there is a limit to reducing the pixel size, so in this way, the PPI can be increased. I'm having difficulty

On the other hand, in the manufacturing process according to the present embodiment, the first to third light emitting elements 141, 142, and 143 are located in the first to third regions R1, R2, and R3 that are spatially separated from each other. It is transferred in units of three sub-pixel arrays 121, 122, and 123. Since the first to third light emitting devices 141, 142, and 143 do not need to be separated for individual chips and are transferred in units of the first to third sub-pixel arrays 121, 122, and 123, the first to third light emitting devices 141, 142, and 143 do not need to be separated. The size and pitch of the three sub-pixels 131, 132, and 133 can be reduced, and therefore, the manufacturing process according to the present embodiment is easy to increase the PPI.

2 and 3A to 3E show that the first to third light emitting elements 141, 142, and 143 constituting the first to third sub-pixels 131, 132, and 133 themselves are red, green, and blue, respectively. Although the case of emitting light has been described as an example, it is not limited thereto.

The display panel 200 according to an embodiment may use a color conversion method.

4 shows a schematic structure of a display panel 200 according to an embodiment. In the display panel 200 of this embodiment, the first to third light emitting devices 241, 242, and 243 constituting the first to third sub-pixels 131, 132, and 133 use a color conversion method. Since it is substantially the same as the display panel 100 described with reference to FIGS. 1 and 2 except for, the differences will be mainly described.

Referring to FIG. 4 , the first light emitting elements 241 include the excitation light micro LED chips 220 arranged in the first region R1 on the substrate 110 and the excitation light emitted from the excitation light micro LED chips 220 . It includes a first color conversion layer 231 that absorbs light and emits light of a first primary color wavelength. These first light emitting devices 241 may be understood as first sub-pixels 131 and constitute the first sub-pixel array 121 .

The second light emitting elements 242 absorb the excitation light emitted from the excitation light micro LED chips 220 and the excitation light micro LED chips 220 arranged in the second region R2 on the substrate 110 and absorb the second light emitting elements 242 . and a second color conversion layer 232 emitting light of a primary color wavelength. These second light emitting devices 242 may be understood as second sub-pixels 132 and constitute the second sub-pixel array 122 .

The third light emitting elements 243 absorb the excitation light emitted from the excitation light micro LED chips 220 and the excitation light micro LED chips 220 arranged in the third region R3 on the substrate 110 and absorb the excitation light emitted from the excitation light micro LED chips 220 and and a third color conversion layer 233 emitting light of a primary color wavelength. These third light emitting elements 243 may be understood as third sub-pixels 133 and constitute the third sub-pixel array 123 .

A transparent layer 235 may be disposed on the excitation light micro LED chips 220 , and first to third color conversion layers 231 , 232 , and 233 may be provided on the transparent layer 235 . The transparent layer 235 is a layer transparent to the excitation light. The first to third color conversion layers 231 , 232 , and 233 are separated for each sub-pixel by the upper barrier rib 236 . Although FIG. 4 shows an empty space between the excitation light micro LED chips 220, it goes without saying that partition walls (not shown) may be provided.

In an embodiment, the excitation light micro LED chips 220 emit ultraviolet light, and the first to third color conversion layers 231, 232, and 233 absorb the ultraviolet light, respectively, to emit red light, green light, and blue light. there is. The first to third color conversion layers 231, 232, and 233 may include quantum dots as a color conversion material.

In an embodiment, the excitation light micro LED chips 220 emit blue light, and the first and second color conversion layers 231 and 232 respectively absorb blue light to emit red light and green light, respectively. In this case, the third color conversion layer 233 may be formed of a material transparent to blue light.

5A to 5F are diagrams illustrating a manufacturing process of the display panel 200 according to an exemplary embodiment.

As shown in FIG. 5A , excitation light micro LED chips 220 are first prepared on a substrate 110 . In one embodiment, the excitation light micro LED chips 220 are manufactured by epitaxially growing a nitride semiconductor on a separate growth substrate and forming an n/p electrode, and may be transferred onto the substrate 110 on which the pixel circuit is formed. . In one embodiment, the excitation light micro LED chips 220 may be epitaxially grown directly on the substrate 110 . A barrier rib may be formed in an empty space between the excitation light micro LED chips 220 .

Next, the transparent layer 235 is disposed as shown in FIG. 5B, and the upper barrier rib 236 is formed as shown in FIG. 5C. The upper barrier rib 236 is formed in a lattice shape when viewed from a plane of the transparent layer 235, and a space separated by the upper barrier rib 236 defines one sub-pixel. The first to third color conversion layers 231 , 232 , and 233 are sequentially formed in the space separated by the upper barrier rib 236 above the transparent layer 235 . For example, as shown in FIG. 5D, by applying the first color conversion layer material 2311 on the first region R1 above the transparent layer 235 through inkjet printing or other known methods, A first color conversion layer 231 is formed. Similarly, as shown in FIG. 5E, the first color conversion layer 231 is formed by applying the second color conversion layer material 2321 on the second region R2 of the upper part of the transparent layer 235, and FIG. 5F , the third color conversion layer 233 is applied by applying the third color conversion layer material 2313 on the third region R3 above the transparent layer 235 .

Since the first to third regions R1, R2, and R3 are spatially separated, the same color conversion layer material can be collectively applied to the same region. of the display panel to overcome the limitations of the manufacturing process. In other words, since each of the first to third color conversion layers 231 , 232 , and 233 may be formed in units of area of the first to third sub-pixel arrays 121 , 122 , and 123 , the first to third sub-pixel arrays 121 , 122 , and 123 may be formed in units of area. The size and pitch of the pixels 131, 132, and 133 can be reduced, and as a result, the PPI can be increased.

6 is a plan view schematically illustrating a sub-pixel arrangement of a display panel according to an exemplary embodiment. This embodiment is substantially similar to the embodiments described with reference to FIGS. 1 to 5F except for the first and second intervals P1 and P2 between the first to third subpixel arrays 121, 122, and 123. Since they are the same, we will focus on the differences. A first distance P1 between the first subpixel array 121 and the second subpixel array 122 and a second distance P2 between the second subpixel array 122 and the third subpixel array 123 ) may be greater than the pitch Ps of the first to third subpixels 131, 132, and 133. In one embodiment, the first interval P1 and the second interval P2 may be the same, but are not limited thereto. The first and second intervals P1 and P2 may be designed with a sufficient size to secure a color separation margin of a combining optical system combining different primary color images. In one embodiment, the first to third sub-pixel arrays 121, 122, and 123 may be located side by side, but are not limited thereto.

7 is a side view of a display panel 300 according to an exemplary embodiment. Referring to FIG. 7 , the first to third light emitting devices 241 , 242 , and 243 constituting the first to third sub-pixels 131 , 132 , and 133 according to an exemplary embodiment. It may be a micro LED chip itself including a subminiature inorganic light emitting material that emits light by itself without a backlight. The first to third light emitting elements 241 , 242 , and 243 are transferred on the substrate 110 in units of first to third subpixel arrays 121 , 122 , and 123 , and the first to third subpixel arrays ( 121 , 122 , 123 ) are located with separation spaces 381 and 382 corresponding to the first and second intervals P1 and P2 interposed therebetween.

8 is a side view of a display panel 500 according to an exemplary embodiment. Referring to FIG. 8 , in an embodiment, the first to third light emitting devices 241 , 242 , and 243 constituting the first to third sub-pixels 131 , 132 , and 133 may use a color conversion method. there is. The excitation light micro LED chips 220 may be disposed on the substrate 110 with a separation space corresponding to the first and second intervals P1 and P2 interposed therebetween. Similarly, the first to third color conversion layers 231 , 232 , and 233 are disposed on the transparent layer 235 with separation spaces 481 and 482 corresponding to the first and second intervals P1 and P2 interposed therebetween. It could be. The separation spaces 481 and 482 corresponding to the first and second intervals P1 and P2 are designed to sufficiently secure a color separation margin in the process of forming the first to third color conversion layers 231, 232, and 233. do.

In the embodiments with reference to FIGS. 1 to 8 , an optical film may be attached or an optical lens may be disposed on the first to third sub-pixel arrays 121 , 122 , and 123 .

9 shows a schematic structure of a display panel 500 according to an embodiment. Referring to FIG. 9 , the display panel 500 further includes a microlens array unit 530 for collimating light emitted from the first to third sub-pixels 131, 132, and 133 into a parallel beam of light. can do. The microlens array unit 530 is an example of an optical lens disposed above the first to third sub-pixel arrays 121, 122, and 123, but is not limited thereto. Since the present embodiment is substantially the same as the embodiment with reference to FIGS. 1 to 8 except that the microlens array unit 530 is further included, the differences will be mainly described.

The microlens array unit 530 may include first to third microlens arrays 531 , 532 , and 533 positioned adjacent to the emission surfaces of the first to third subpixel arrays 121 , 122 , and 123 . there is. Since the first to third sub-pixel arrays 121, 122, and 123 emit light of different first to third primary color images, the first to third microlens arrays 531, 532, and 533 respectively A curved surface can be designed to suit the primary color wavelength band. In the conventional pixel layout, red sub-pixels, green sub-pixels, and blue sub-pixels are arranged adjacently to form one pixel. Since the size of each sub-pixel is very small, a microlens array is manufactured to suit each sub-pixel. And it was difficult to arrange them to match each sub-pixel. On the other hand, in the display panel 500 of this embodiment, since the first to third subpixel arrays 121, 122, and 123 are spatially separated, the first to third microlens arrays 531, 532, and 533 are not provided. It is easy to manufacture and arrange according to each primary color of the first to third sub-pixel arrays 121, 122, and 123.

In the microlens array unit 530 shown in FIG. 9, the first to third microlens arrays 531, 532, and 533 are in close contact with each other, but the first to third microlens arrays 531, 532, and 533 may be spaced apart from each other.

10 is a side cross-sectional view schematically illustrating a structure of a monochromatic micro LED device 600 according to an exemplary embodiment. The monochromatic micro LED device 600 of this embodiment may be applied to the light emitting devices of the display panels 100, 200, 300, and 400 of the above-described embodiments.

Referring to FIG. 10, the monochromatic micro LED device 600 includes a micro LED chip 620 provided on a substrate 610, a barrier rib 630 separating the micro LED chip 620 from neighboring chips, and a micro LED chip ( 620) may include first and second color conversion layers 641 and 642 absorbing the excitation light L _e emitted and emitting converted light L _c converted into a primary color wavelength band.

The micro LED chip 620 includes a subminiature inorganic light emitting material that emits light by itself without a backlight. The micro LED chip 620 may have a width, length, and height of 1 μm to 100 μm, respectively. A wavelength band of the excitation light L _e emitted from the micro LED chip 620 may be determined according to the inorganic light emitting material. The excitation light L _e emitted from the micro LED chip 620 may be blue light or ultraviolet light.

The micro LED chip 620 is manufactured by growing a plurality in a chip form on a wafer (growth substrate) through an epitaxial process or the like. The micro LED chip 620 manufactured in this way may be transferred onto the substrate 610 .

The barrier rib 630 is positioned between sub-pixels (eg, 131 of FIG. 1 ) to prevent crosstalk between sub-pixels. In other words, the space separated by the barrier rib 630 defines one sub-pixel. 10 shows a configuration in which one micro LED chip 620 is disposed in a space separated by a partition wall 630, but two or more micro LED chips 620 are placed in a space separated by a partition wall 630. may be placed.

First and second color conversion layers 641 and 642 are positioned above the micro LED chip 620 . The first color conversion layer 641 is a layer relatively close to the micro LED chip 620 and may be understood as a lower layer based on the drawing of FIG. 10 . The second color conversion layer 642 is a layer relatively far from the micro LED chip 620 and may be understood as an upper layer based on the drawing of FIG. 10 . A band pass filter 650 having a wavelength band of the converted light L _c converted by the first and second color conversion layers 641 and 642 as a pass band is provided above the second color conversion layer 642. can For example, when the converted light L _c is red light, the band pass filter 650 may use a red wavelength as a passband. When the converted light L _c is green light, the band pass filter 650 may use a green wavelength as a passband.

The first and second color conversion layers 641 and 642 include quantum dots that absorb excitation light L _e and emit converted light L _c converted into a primary color wavelength band.

Quantum dots are semiconductor nanocrystals that can be tuned to emit light across the visible and infrared spectrum. Due to the small size of 1 to 100 nm, more typically 1 to 20 nm, the wavelength of the emitted light, i.e. the color, may depend on the size of the quantum dots. In one embodiment, the excitation light L _e may be blue light, and the quantum dots may have a size that absorbs blue light and emits red light. In one embodiment, the excitation light L _e may be blue light, and the quantum dots may have a size that absorbs blue light and emits green light. In one embodiment, the excitation light (L _e ) may be ultraviolet light, and the quantum dots may have a size that emits red light by absorbing ultraviolet light. In one embodiment, the excitation light (L _e ) may be ultraviolet light, and the quantum dots may have a size that emits green light by absorbing ultraviolet light. In one embodiment, the excitation light (L _e ) may be ultraviolet light, and the quantum dots may have a size that emits blue light by absorbing ultraviolet light.

The quantum dots contained in the first color conversion layer 641 and the quantum dots contained in the second color conversion layer 642 are the same nanocrystal, but the density of the quantum dots in the first color conversion layer 641 (hereinafter, the first color conversion layer 641) Quantum dot density) in the second color conversion layer 642 is different from each other.

In one embodiment, the first quantum dot density of the first color conversion layer 641 may be smaller than the second quantum dot density of the second color conversion layer 642 .

The quantum dots of the first color conversion layer 641 absorb a part of the excitation light L _e emitted from the micro LED chip 620 and emit the converted light L _c . Among the converted lights (L _c ) converted in the first color conversion layer 641, the upwardly directed light passes through the second color conversion layer 642 and is emitted to the top of the monochromatic micro LED device 600, so the upwardly directed light A significant amount of the quantum dots may be reabsorbed by other quantum dots in the first color conversion layer 641 and quantum dots in the second color conversion layer 642 to reduce absorption efficiency of the quantum dots.

Meanwhile, another part of the excitation light L _e emitted from the micro LED chip 620 passes through the first color conversion layer 641 and is directed to the second color conversion layer 642 . The quantum dots of the second color conversion layer 642 also absorb a part of the excitation light L _e and emit the converted light L _c . Of the converted light (L _c ) converted in the second color conversion layer 642, most of the upwardly directed light is emitted to the top of the monochromatic micro LED device 600, and only some of the other quantum dots in the second color conversion layer 642. It can be reabsorbed by , and the absorption efficiency of quantum dots can be reduced.

Compared to the converted light (L _c ) converted in the second color conversion layer 642 as described above, the converted light (L c ) converted in the first color conversion layer 641 lowers the absorption efficiency of the quantum dots more _. It can be seen that it contributes to Therefore, in this embodiment, by making the first quantum dot density of the first color conversion layer 641 smaller than the second quantum dot density of the second color conversion layer 642, compared to a single-layer color conversion layer having the same amount of quantum dots, The absorption efficiency of quantum dots can be improved.

A protective layer 660 may be provided on top of the band pass filter 650 . The protective layer 660 is formed of a material that is transparent to the converted light L _c and protects the quantum dots included in the first and second color conversion layers 641 and 642 from an external environment.

10 illustrates a case in which the color conversion layer has a double-layer structure (ie, first and second color conversion layers 641 and 642) as an example, but the color conversion layer has a structure of three or more layers having different quantum dot densities. Of course you can have it.

11 illustrates relative radiation emitted from the micro LED device according to the mean free path (MFP) of the lower layer when the color conversion layer of the monochromatic micro LED device according to an embodiment is a double layer (thickness: 10 μm/10 μm). It is a chart showing relative (radiant flux) in contrast to the case of the comparative example, which is a single layer.

The lower layer (ie, the first color conversion layer 641 in FIG. 10 ) and the upper layer (ie, the second color conversion layer 642 in FIG. 10 ) of the color conversion layers of the monochromatic micro LED device each have a thickness of 10 μm. The MFP of the upper layer is 0.02 mm, and the MFP of the lower layer is changed from 0.02 mm to 0.12 mm. Since the MFP is an average free distance until light is scattered in the color conversion layer, it can be converted into a quantum dot density in the color conversion layer. That is, fixing the MFP of the upper layer and gradually changing the MFP of the lower layer can be interpreted as equivalent to fixing the quantum dot density of the upper layer and gradually changing the quantum dot density of the lower layer. That is, FIG. 9 shows that the relative radiation flux exceeds 0.5 Watt within a range in which the quantum dot density of the lower layer is smaller than the quantum dot density of the upper layer.

On the other hand, the monochromatic micro LED device of Comparative Example has a color conversion layer of a single layer structure, has a thickness of 10 μm, and similarly, the MFP is changed from 0.02 mm to 0.12 mm. As a result, it can be seen that the relative radiation flux of the Comparative Example is less than 0.5 Watt in most of the range of MFP from 0.02 mm to 0.12 mm, which is lower than that of the color conversion layer having a double layer structure in one embodiment.

12 is a comparative example in which the relative radiation flux emitted from the micro LED device according to the MFP of the lower layer is a single layer when the color conversion layer of the monochromatic micro LED device according to an embodiment is a double layer (thickness: 2.5 μm/2.5 μm). It is a diagram showing the case by case.

The lower layer and the upper layer of the color conversion layer of the monochromatic micro LED device according to an embodiment each have a thickness of 2.5 μm. The MFP of the upper layer is 0.02 mm, and the MFP of the lower layer is changed from 0 mm to 0.1 mm. 12 shows that the relative radiation flux is 0.3 Watt or more within a range in which the quantum dot density of the lower layer is smaller than the quantum dot density of the upper layer.

On the other hand, the monochromatic micro LED device of Comparative Example has a color conversion layer of a single layer structure, has a thickness of 5 μm, and similarly, the MFP was changed from 0 mm to 0.1 mm. As a result, it can be seen that the relative radiation flux of the Comparative Example is lower than that of the color conversion layer having a double layer structure according to one embodiment in most of the MFP range of 0 mm to 0.1 mm.

As shown in FIGS. 11 and 12, when the monochromatic micro LED device has a double-layered color conversion layer and the density of quantum dots in the lower layer is smaller than that in the upper layer, the monochromatic micro LED device has a single-layered color conversion layer. It can be seen that it has a high radiation flux (in other words, high color conversion efficiency) compared to the monochromatic micro LED device of the comparative example. The single color micro LED device having the color conversion layer of the double layer structure described in FIGS. 11 and 12 may be understood as the single color micro LED device 600 described with reference to FIG. 10 .

13 is a cross-sectional side view schematically illustrating a structure of a monochromatic micro LED device 700 according to an exemplary embodiment.

Referring to FIG. 13, the monochromatic microLED device 700 is similar to the monochromatic microLED device 600 described with reference to FIG. 10 except that the barrier rib 730 has reflectivity for the excitation light L _e . Since they are substantially the same, the description will focus on the differences.

The barrier rib 730 may be formed of a reflective material for the excitation light L _e or coated with a reflective material. The barrier rib 730 may also reflect the converted light L _c converted by the first and second color conversion layers 641 and 642 .

Since at least a part of the excitation light (L _e ) emitted from the micro LED chip 620 is directed toward the barrier rib 730, the barrier rib 730 is made to have reflectivity for the excitation light (L _e ), thereby reducing the barrier rib 730. Light absorption efficiency in the first and second color conversion layers 641 and 642 may be increased by returning the excitation light L _e to the first and second color conversion layers 641 and 642 .

14 is a side cross-sectional view schematically illustrating a structure of a monochromatic micro LED device 800 according to an exemplary embodiment.

Referring to FIG. 14 , the monochromatic micro LED device 800 includes a first dichroic mirror layer 850 provided on the upper portion of the second color conversion layer 642 and a second dichroic mirror layer provided on the lower portion of the first color conversion layer 641 . At least one of the mirror layers 860 may be included. The monochromatic micro LED device 800 of the present embodiment is the same as the monochromatic micro LED devices 600 and 700 described with reference to FIG. 10 or FIG. 13 except that the first and second dichroic mirror layers 850 and 860 are included. Since it is substantially the same as, it will be described focusing on the differences.

It can be understood that the first dichroic mirror layer 850 replaces the band pass filter 650 of the monochromatic micro LED device 600 described with reference to FIG. 10 . The first dichroic mirror layer 850 is a layer that passes the converted light L _c converted by the first and second color conversion layers 641 and 642 and reflects the excitation light L _e . For example, when the converted light L _c is red light, the first dichroic mirror layer 850 passes the red light and reflects the excitation light L _e . When the converted light L _c is green light, the first dichroic mirror layer 850 passes the green light and reflects the excitation light L _e . The excitation light (L _e ) passing through the second color conversion layer 642 and directed to the top of the monochromatic micro LED device 800 is returned to the first and second color conversion layers 641 and 642 to return to the first and second color conversion layers 641 and 642 . Light absorption efficiency in the color conversion layers 641 and 642 may be increased.

The second dichroic mirror layer 860 reflects the converted light L _c converted by the first and second color conversion layers 641 and 642 and passes the excitation light L _e . For example, when the converted light L _c is red light, the second dichroic mirror layer 860 reflects the red light and passes the excitation light L _e . When the converted light L _c is green light, the second dichroic mirror layer 860 reflects the green light and passes the excitation light L _e . The second dichroic mirror layer 860 reflects the downwardly directed light of the converted light _Lc converted in the first color conversion layer 641 and directs it upward, thereby controlling the light amount of the emitted converted light _Lc . can increase

15 is a diagram schematically illustrating a display device 900 according to an exemplary embodiment.

Referring to FIG. 15 , a display device 900 includes a display panel 910 and a coupling optical system 920 .

The display panel 910 may be any one of the display panels 100, 200, 300, 400, and 500 of the above-described embodiments.

The combining optical system 920 transmits the first light L1 corresponding to the first primary color image output from the first sub-pixel array 911 of the display panel 910 and the first light L1 output from the second sub-pixel array 912 . A full-color image is formed by combining the second light L2 corresponding to the two primary color image and the third light L3 corresponding to the third primary color image output from the third sub-pixel array 913. As an optical member to do, it may be composed of a lens, a reflector, a mirror, and the like. For example, the first subpixel array 911 forms a red picture, the second subpixel array 912 forms a green picture, the third subpixel array 913 forms a blue picture, and the combination Red, green, and blue images may be superimposed by the optical system 920 and combined into one full-color image.

The coupling optical system 920 may further include a projection lens (not shown) so that the display device 900 functions as a projection type.

16 is a diagram schematically illustrating a display device 1000 according to an exemplary embodiment.

Referring to FIG. 16 , the display device 1000 may include a display panel 1010 and an image combiner that combines and guides first to third lights emitted from the display panel 1010 . The display device 1000 includes a collimating optical system 1020 such as a microlens array (see 530 in FIG. 9 ) that collimates the first to third lights L1, L2, and L3 emitted from the display panel 1010 into parallel beams. may further include.

The image combiner includes first to third waveguides 1031, 1032, and 1033, first to third input couplers 1041, 1042, and 1043, and first to third output couplers 1051, 1052, and 1053. can include The image combiner may be understood as an example of a combining optical system for generating a full-color image by combining the first to third lights.

The first to third waveguides 1031, 1032, and 1033 are formed of a material that is transparent to the first to third lights L1, L2, and L3 and may be spaced apart from each other. A spacer (not shown) may be interposed between the first to third waveguides 1031, 1032, and 1033. The first to third waveguides 1031, 1032, and 1033 respectively propagate the first to third lights L1, L2, and L3 by total internal reflection.

The first to third input couplers 1041, 1042, and 1043 and the first to third output couplers 1051, 1052, and 1053 may be, for example, a diffractive optical element (DOE) or a holographic optical element. optical element: HOE).

The first input coupler 1041 is positioned opposite to the first sub-pixel array 1011 of the first waveguide 1031, and couples the first light L1 to the first waveguide 1031 (ie, input ) make The surface on which the first input coupler 1041 is provided in the first waveguide 1031 may be a surface facing the first subpixel array 1011 or a surface opposite to the surface facing the first subpixel array 1011. Alternatively, the first input coupler 1041 may be located inside the first waveguide 1031.

The second input coupler 1042 is positioned opposite to the second sub-pixel array 1012 of the second waveguide 1032, and couples the second light L2 to the second waveguide 1032 (ie, input ) make In the second waveguide 1032, the side on which the second input coupler 1042 is provided may be a side facing the second sub-pixel array 1012 or a side opposite to the side facing the second sub-pixel array 1012. Alternatively, the second input coupler 1042 may be located inside the second waveguide 1032.

The third input coupler 1043 is positioned opposite to the third sub-pixel array 1013 of the third waveguide 1033, and couples the third light L3 to the third waveguide 1033 (ie, input ) make The surface of the third waveguide 1033 on which the third input coupler 1043 is provided may be a surface facing the third sub-pixel array 1013 or a surface opposite to the surface facing the third sub-pixel array 1013. Alternatively, the third input coupler 1043 may be located inside the third waveguide 1033.

The first to third output couplers 1051, 1052, and 1053 are provided in the output regions of the first to third waveguides 1031, 1032, and 1033, respectively, and the first to third lights L1, L2, and L3 to the target area. The target area may be a user's eye motion box, and in this case, the display device 1000 may be a near-eye display device such as an augmented reality device or a virtual reality device. The image combiner may transmit light of a real word in the thickness direction of the first to third waveguides 1031, 1032, and 1033. When the image combiner combines light of a virtual image emitted from the display panel 1010 and light of a real environment, the display device 1000 may be understood as an augmented reality device.

In one embodiment, the first light L1 emitted from the first sub-pixel array 1011 does not pass through the second and third waveguides 1032 and 1033 while reaching the first waveguide 1031, As shown in FIG. 16 , portions of the second and third waveguides 1032 and 1033 opposite to the first subpixel array 1011 may be removed or a through hole may be formed. Similarly, the third waveguide 1033 prevents the second light L2 emitted from the second sub-pixel array 1012 from passing through the third waveguide 1033 while reaching the second waveguide 1032. A portion facing the second subpixel array 1012 may be removed or a through hole may be formed. Areas of the first to third waveguides 1031, 1032, and 1033 into which the first to third lights L1, L2, and L3 are input may have a stepped shape. That is, the second waveguide 1032 does not have an area facing the first sub-pixel array 1011, and the third waveguide 1033 faces the first and second sub-pixel arrays 1011 and 1012. It can be configured not to have an area.

In one embodiment, the first to third waveguides 1031, 1032, and 1033 are stacked without changing their shape, so that, for example, after the first light L1 passes through the second and third waveguides 1032 and 1033, the first It can also be made to reach the waveguide 1031.

In one embodiment, the image combiner may have only one waveguide and guide the first to third lights L1, L2, and L3 within one waveguide.

17 schematically illustrates an augmented reality device 1100 according to an embodiment. Referring to FIG. 17 , the augmented reality device 1100 may be augmented reality glasses.

The augmented reality device 1100 may use the display device 1000 described with reference to FIG. 16 as a left eye element and a right eye element.

The augmented reality device 1100 may further include a display panel 1120 and an image combiner 1110 . The image combiner 1110 may be fixed to the frame 1190 . The display panel 1120 may be located near the temple of the user's head and fixed to the frame 1190 . Information processing and image formation for the display panel 1120 are performed directly on the computer of the augmented reality device itself, or when the augmented reality device is connected to an external electronic device such as a smart phone, tablet, computer, laptop, or any other intelligent (smart) device. It can be connected to and made in an external electronic device. Signal transmission between the augmented reality device and the external electronic device may be performed through wired communication and/or wireless communication. The augmented reality device may receive power from at least one of a built-in power source (rechargeable battery), an external device, and an external power source.

The input-coupler 1130 of the image combiner 1110 is located on the surface opposite to or behind the display panel 1120 of the waveguide (see 1031, 1032, and 1033 in FIG. The output light is input to the waveguide. The waveguide guides the input light toward the output-coupler (1051, 1052, and 1053 in FIG. 16), and outputs the light to the target area through the output-coupler. In this case, the target area may be the user's eye motion box.

17 shows a case where the image combiner 1110 and the display panel 1120 are provided on the left and right sides, respectively, but is not limited thereto. In one embodiment, the image combiner 1110 and the display panel 1120 may be provided on either the left side or the right side. In one embodiment, the image combiner 1110 may be provided over the entire left and right sides, and the display panel 1120 may be provided for both left and right sides, or may be provided to correspond to each of the left and right sides.

In the present disclosure, the display device has been described focusing on an example applied to augmented reality glasses, but it will be apparent to those skilled in the art that it can be applied to a virtual reality device capable of expressing virtual reality and a head-up display (HUD) device.

18 is a diagram schematically illustrating a display device 1200 according to an exemplary embodiment.

Referring to FIG. 18 , the display device 1200 includes a display panel 1210, an X-cube prism 1220, and first and second reflection members 1231 and 1232.

The display panel 1210 may be any one of the display panels 100, 200, 300, 400, and 500 of the above-described embodiments.

The X-cube prism 1220 and the first and second reflection members 1231 and 1232 may be understood as specific examples of a combined optical system.

The first and second reflection members 1231 and 1232 may be mirrors or prisms. The first reflective member 1231 allows the first light L1 corresponding to the first primary color image output from the first sub-pixel array 1211 of the display panel 1210 to hit the first surface of the X-cube prism 1220. The optical path of the first light L1 is changed so as to be directed. The second reflection member 1232 directs the third light L3 corresponding to the third primary color image output from the third sub-pixel array 1213 of the display panel 1210 to the first surface of the X-cube prism 1220. The path of the third light L3 is changed so as to face the second surface opposite to the .

The X-Cube prism 1220 is a known optical element having a cubic shape in which dichroic mirror layers are provided, and paths of the first to third lights L1 and L3 of different wavelengths are combined. Specifically, the X-cube prism 1220 is disposed such that a third surface different from the first and second surfaces faces the second sub-pixel array 1212 . The X-cube prism 1220 passes the second light L2 corresponding to the second primary color image output from the second sub-pixel array 1212 as it is, and transmits the first light L1 and the third light L3. Reflected in the same direction as the second light L2, the first to third lights L1, L2, and L3 are combined to form one full-color image. For example, the first sub-pixel array 1211 forms a red image, the second sub-pixel array 1212 forms a green image, the third sub-pixel array 1213 forms a blue image, and Red, green, and blue images may be superimposed by the cube prism 1220 and combined into one full-color image.

19 is a diagram schematically illustrating a display device according to an exemplary embodiment.

Referring to FIG. 19 , a display device 1300 includes a display panel 1310 and first to third lenses 1321 , 1322 , and 1323 .

The display panel 1310 may be any one of the display panels 100, 200, 300, 400, and 500 of the above-described embodiments.

The first lens 1321 projects the first light L1 corresponding to the first primary color image output from the first sub-pixel array 1311 of the display panel 1310 onto the screen S.

The second lens 1322 projects the second light L2 corresponding to the second primary color image output from the second sub-pixel array 1312 of the display panel 1310 onto the screen S.

The third lens 1323 projects the third light L3 corresponding to the third primary color image output from the third sub-pixel array 1313 of the display panel 1310 onto the screen S.

The first to third lenses 1321, 1322, and 1323 are optical members that project the first to third lights L1, L2, and L3 emitted from the display panel 1310 to overlap one screen S. It can be understood as a specific example of the coupling optical system.

The first to third primary color images are overlapped and projected on the screen S by the first to third lenses 1321, 1322, and 1323, so that full-color images can be formed on the screen S. For example, the first sub-pixel array 1311 forms a red image, the third sub-pixel array 1312 forms a green image, the third sub-pixel array 1313 forms a blue image, Red, green, and blue images may be superimposed on the screen S by the first to third lenses 1321, 1322, and 1323 and combined into one full-color image.

The above-described display panel of the present invention and a display device employing the same have been described with reference to the embodiments shown in the drawings to help understanding, but this is only an example, and various modifications and It will be appreciated that other equivalent embodiments are possible. Therefore, the true technical protection scope of the present invention should be defined by the appended claims.

100, 200, 300, 400, 500, 910: display panel
900, 1000, 1200, 1300: display device
1010, 1320, 1320: display panel
121, 122, 123, 911, 912, 913. 1011, 1012, 1013, 1211, 1212, 1213, 1311, 1312, 1313: subpixel array
131, 132, 133: sub-pixels
1020: collimation optical system
1031, 1032, 1033: Waveguide
1041, 1042, 1043: input coupler
1051, 1052, 1053: output coupler
1100: augmented reality device
1110: image combiner
1220: X Cube Prism
1231, 1232: reflective member
1321, 1322, 1323: lens
231, 232, 233, 641, 642: color conversion layer
236, 630, 730: bulkhead
481, 482: spacing space corresponding to
530: microlens array unit
531, 532, 533: microlens array
600, 700, 800: Monochrome micro LED elements
650: band pass filter
850, 860: dichromatic mirror layer
920: combined optical system

Claims (22)

Board;
a first subpixel array including first subpixels arranged in a first region on the substrate to form a first primary color image;
a second subpixel array including second subpixels arranged in a second region on the substrate to form a second primary color image; and
a third subpixel array including third subpixels arranged in a third region on the substrate to form a third primary color image;
The first to third regions are configured to be spatially separated and adjacent side by side on the same side of the substrate,
The first to third subpixels are grouped by the same primary color and patterned into the first to third subpixel arrays in the first to third regions, respectively.
display panel. According to claim 1,
The spacing between the first subpixel array and the second subpixel array and the spacing between the second subpixel array and the third subpixel array are the same as the pitch of the first to third subpixels,
display panel. According to claim 1,
A first spacing between the first subpixel array and the second subpixel array and a second spacing between the second subpixel array and the third subpixel array are greater than pitches of the first to third subpixels. ,
display panel. According to claim 1,
Each of the first subpixels includes at least one first primary color light emitting device;
Each of the second sub-pixels includes at least one second primary color light emitting device;
Each of the third sub-pixels includes at least one third primary color light emitting device.
display panel. According to claim 4,
The first to third primary color light emitting devices are a red micro LED device, a green micro LED device, and a blue micro LED device, respectively.
display panel. According to claim 4,
The first primary color light emitting element includes an excitation light micro LED element and a first primary color color conversion provided on the excitation light micro LED element to absorb excitation light emitted from the excitation light micro LED element and emit light of a first primary color. contains layers,
The second primary color light emitting element includes an excitation light micro LED element, and is provided on the excitation light micro LED element to absorb excitation light emitted from the excitation light micro LED element and emit light of a second primary color. containing layers,
display panel. According to claim 6,
The excitation light is blue light,
The first primary color conversion layer includes first quantum dots absorbing blue light and emitting red light,
The second primary color conversion layer includes second quantum dots that absorb blue light and emit green light.
display panel. According to claim 7,
The first primary color conversion layer includes a plurality of first quantum dot layers having different first quantum dot densities,
display panel. According to claim 8,
The first quantum dot density of the upper layer of the plurality of first quantum dot layers is smaller than the first quantum dot density of the upper layer,
display panel. According to claim 6,
The excitation light is ultraviolet light,
The third primary color light emitting element includes an ultraviolet light micro LED element and a third primary color color conversion layer provided on the ultraviolet light micro LED element to absorb ultraviolet light emitted from the ultraviolet light micro LED element and emit blue light ,
display panel. According to claim 10,
The third primary color conversion layer includes third quantum dots absorbing ultraviolet light and emitting blue light,
display panel. According to claim 6,
The first primary color light emitting device further comprises a first dichromatic mirror layer provided on the first primary color conversion layer and reflecting the excitation light passing through the first primary color conversion layer to the first primary color conversion layer.
display panel. According to claim 12,
The first primary color light emitting element is provided between the excitation light micro LED element and the first primary color conversion layer to emit light of a first primary color converted in the first primary color conversion layer and directed toward the excitation light micro LED element. Further comprising a second dichroic mirror layer for reflecting on the first color conversion layer,
display panel. According to claim 4,
A reflective barrier rib is provided between the first to third primary color light emitting devices,
display panel. The display panel according to any one of claims 1 to 14; and
The first light corresponding to the first primary color image output from the first sub-pixel array of the display panel, the second light corresponding to the second primary color image output from the second sub-pixel array, and the third sub-pixel array A coupling optical system for combining the third light corresponding to the output third primary color image; including,
display device. According to claim 15,
The combining optical system is an image combiner that combines the first to third lights and guides them to the user's eye motion box,
display device. According to claim 16,
The image combiner is positioned to face at least one waveguide and the first to third sub-pixel arrays, respectively, and first to third inputs couple the first to third lights to the at least one waveguide. A coupler and an output coupler for outputting the first to third lights from the at least one waveguide to the user's eye motion box,
display device. According to claim 17,
The at least one waveguide includes first to third waveguides respectively guiding the first to third lights,
The first to third input couplers are provided in the first to third waveguides, respectively.
display device. According to claim 18,
Among the first to third waveguides, a second waveguide does not have an area facing the first sub-pixel array, and the third waveguide does not have an area facing the first and second sub-pixel arrays. ,
display device. According to claim 16,
The display device is a virtual reality device or an augmented reality device,
display device. According to claim 15,
The combining optical system includes an X-cube prism for combining the paths of the first to third lights and a plurality of reflecting members for changing the paths of the first to third lights toward the X-cube prism.
display device. According to claim 15,
The combining optical system includes first to third lenses for projecting the first to third lights to overlap on one screen.
display device.

Images