CN110782806A - Display device - Google Patents

Abstract

The invention provides a display device comprising a reflective display panel and a micro light-emitting diode panel. The display device has a display surface, and the reflective display panel has a reflective surface. The micro light emitting diode panel is overlapped on the reflective display panel and comprises a driving circuit layer and a plurality of light emitting diode elements. The driving circuit layer is positioned between the reflective display panel and the display surface. The micro light-emitting diode elements are electrically connected with the driving circuit layer. The display surface and the reflection surface are respectively positioned at two opposite sides of the micro light-emitting diode elements, and the visible light penetration rate of the micro light-emitting diode panel is more than 50%.

Description

display device

technical field

The present invention relates to a display device, in particular to a display device with light emitting diode elements.

Background technique

With the continuous vigorous development of display technology, in addition to the display performance of display devices, such as resolution, contrast, and frame rate, the appearance of display devices is gradually becoming thinner, lighter, and more flexible. Flexible, borderless and other designs are developed to meet consumers' needs for visual taste, storage and portability. Among them, the reflective display device achieves the effect of displaying the picture by illuminating the external ambient light, which can save the configuration of the light source module, which helps to improve the thinness and portability of the reflective display device, and the advantage of low energy consumption is more Therefore, the reflective display device is widely used in products such as electronic paper, electronic book or electronic signboard.

However, since the reflective display device needs to be irradiated by an external light source to generate a display image, its display effect is easily affected by the irradiation method of the external ambient light or the viewing position of the user, resulting in inconvenience in use. For example, in a slightly dim place, the image of the reflective display device is not clear due to insufficient illumination of the ambient light; or in a situation where the directivity of the ambient light is high, the viewing position of the user is limited. That is to say, the reflective display device has poor adaptability to the operating environment. How to solve the above problems has become an important issue for related manufacturers.

SUMMARY OF THE INVENTION

The present invention provides a display device with a power saving function, which has better display quality and better operation adaptability.

The display device of the present invention has a display surface and includes a reflective display panel and a miniature light-emitting diode panel. The reflective display panel has a reflective surface. The miniature light-emitting diode panel is overlapped and arranged on the reflective display panel, and includes a driving circuit layer and a plurality of light-emitting diode elements. The driving circuit layer is located between the reflective display panel and the display surface. These micro light emitting diode elements are electrically connected to the driving circuit layer. The display surface and the reflection surface are respectively located on opposite sides of the micro-LED elements, and the visible light transmittance of the micro-LED panel is greater than 50%.

In an embodiment of the present invention, the reflective display panel of the above-mentioned display device includes a plurality of pixel structures. A first period exists between any two adjacent micro light emitting diode elements, and a second period exists between any two adjacent pixel structures, and the first period is an integer multiple of the second period.

In an embodiment of the present invention, the reflective display panel of the above-mentioned display device includes a plurality of pixel structures overlapping the display surface, and the pixel structures are staggered from the plurality of light emitting diode elements in the normal direction of the display surface.

In an embodiment of the present invention, the micro LED panel of the above-mentioned display device further includes a plurality of pixels. Each of these pixels has at least one miniature light emitting diode element. The number of the plurality of pixel structures of the reflective display panel is different from the number of the plurality of pixels of the micro light emitting diode panel.

In an embodiment of the present invention, the number of the plurality of pixel structures of the reflective display panel of the above-mentioned display device is greater than the number of the plurality of pixels of the micro light emitting diode panel.

In an embodiment of the present invention, each pixel of the above-mentioned display device has a red micro-LED, a blue micro-LED, and a green micro-LED.

In an embodiment of the present invention, the micro-LED panel of the above-mentioned display device further includes a plurality of dimming patterns. The dimming patterns are overlapped on a plurality of miniature light emitting diode elements, and the miniature light emitting diode elements are located between the reflective display panel and the dimming patterns.

In an embodiment of the present invention, the above-mentioned driving circuit layer of the display device includes a plurality of connection pads, which are disposed on a plurality of micro light emitting diode elements. The miniature light emitting diode elements are bonded to the connection pads, and the connection pads are in a plurality of dimming patterns.

In an embodiment of the present invention, the above-mentioned display device further includes a touch element layer. The touch element layer is overlapped on the reflective display panel and the micro-LED panel, and the micro-LED panel is located between the touch element layer and the reflective display panel.

In an embodiment of the present invention, the above-mentioned display device further includes a touch element layer disposed between the display surface and the micro-LED elements. The touch element layer includes driving electrodes and sensing electrodes.

In an embodiment of the present invention, the micro-LED panel of the above-mentioned display device further includes a substrate. The touch element layer is disposed on the first surface of the substrate, and the driving circuit layer is located on the touch element layer.

In an embodiment of the present invention, the substrate of the micro-LED panel of the above-mentioned display device is provided with a display surface, and the display surface is opposite to the first surface.

In an embodiment of the present invention, the micro-LED panel of the above-mentioned display device further includes a substrate. The driving circuit layer is disposed on the first surface of the substrate. These micro light emitting diode elements are bonded on the driving circuit layer, and the substrate and the driving circuit layer are located between the reflective display panel and the plurality of micro light emitting diode elements.

In an embodiment of the present invention, the micro-LED panel of the above-mentioned display device further includes a plurality of dimming patterns. The dimming patterns are overlapped on a plurality of miniature light emitting diode elements, and the miniature light emitting diode elements are located between the reflective display panel and the dimming patterns.

In an embodiment of the present invention, when the above-mentioned display device operates in a light source mode, the micro LED panel provides a light source to the reflective display panel. When operating in the display mode, the micro LED panel is a display panel.

In an embodiment of the present invention, when the above-mentioned display device operates in the hybrid mode, the micro LED panel and the reflective display panel display different images respectively.

Based on the above, in the display device according to an embodiment of the present invention, through the configuration relationship between the LED panel and the reflective display panel, the operation flexibility of the reflective display panel can be increased, which helps to improve the operation of the display device for different usage scenarios. operational adaptability. On the other hand, the penetration rate of the LED panel is greater than 50%, which can effectively reduce the external ambient light and the light energy loss of the light beam reflected by the self-reflection display panel after passing through the LED panel, thereby increasing the light energy of the display device. The usage rate helps to improve the overall display quality.

Description of drawings

1 is a schematic diagram of a display device according to a first embodiment of the present invention;

2A to 2C are cross-sectional views of partial regions of the display device of FIG. 1 in different operation modes;

3 is a top view of a display device according to a second embodiment of the present invention;

4 is a cross-sectional view of a display device according to a third embodiment of the present invention;

5 is a cross-sectional view of a display device according to a fourth embodiment of the present invention;

6 is a cross-sectional view of a display device according to a fifth embodiment of the present invention;

7 is a cross-sectional view of a display device according to a sixth embodiment of the present invention;

8 is a cross-sectional view of a display device according to a seventh embodiment of the present invention;

9 is a cross-sectional view of a display device according to an eighth embodiment of the present invention.

Description of reference numbers:

10, 10A, 11, 11A, 12, 13, 20, 21: Display device

100: Reflective display panel

100A: Absorbing side

100R: Reflective surface

105, 105A: Display medium layer

110: Microcapsules

120: E-ink

121: White particles

122: Black Particles

123: Transparent liquid

130: Third electrode

140: Fourth electrode

200, 200-1, 200A, 200B, 200C: Micro LED Panels

201, 202: Substrate

201a: First Surface

201b: Second Surface

202a: Third surface

202b: Fourth surface

210, 210A: drive circuit layer

215, 215A, 215B: Connection pads

220, 220A, 220-1: Miniature Light Emitting Diode Elements

221: First electrode

222: Second electrode

223: first type semiconductor layer

224: Light Emitting Layer

225: second type semiconductor layer

230, PL: flat layer

240: encapsulation layer

250: Light reduction pattern

300, 300A: touch element layer

301: Substrate

310, 310A: drive electrodes

320, 320A: Sensing electrodes

AX1, AX2: central axis

D: Drain

DS: Display side

ES: Epitaxial structure

G: Gate

GI: Gate insulating layer

LB1, LB2, LB1a, LB2a, LB3a, LB4a: Beam

P1: first cycle

P2: Second cycle

PX: pixel structure

S: source

SC: Semiconductor pattern

T: Active element

Detailed ways

In the drawings, the thickness of layers, films, panels, regions, etc., are exaggerated for clarity. It will be understood that when an element such as a layer, film, region or substrate is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element, or Intermediate elements may also be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element, there are no intervening elements present. As used herein, "connected" may refer to a physical and/or electrical connection. Furthermore, the "electrical connection" may refer to the existence of other elements between the two elements.

Reference will now be made in detail to the exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numerals are used in the drawings and description to refer to the same or like parts.

FIG. 1 is a schematic diagram of a display device according to a first embodiment of the present invention. 2A to 2C are cross-sectional views of partial regions of the display device of FIG. 1 in different operation modes. 3 is a plan view of a display device according to a second embodiment of the present invention. It is particularly noted that, for the sake of clarity, FIG. 3 only shows the display medium layer 105 and the micro light emitting diode element 220 - 1 of the display device 10A.

Referring to FIG. 1 , the display device 10 includes a reflective display panel 100 and a micro LED panel 200 . In this embodiment, the reflective display panel 100 is, for example, an electrophoretic display (EPD) panel, but the invention is not limited thereto. In other embodiments, the reflective display panel may also be a cholesteric liquid crystal (CLC) panel, a reflective LCD (reflective LCD) panel, an electrowetting display (EWD) panel, or a fast-response liquid powder Display (quick response-liquid powder display, QR-LPD) panel.

In particular, the display device 10 can have various operation modes, and can be divided into a light source mode, a display mode and a hybrid mode according to the operation mode of the micro LED panel 200 . For example, when the display device 10 (or the micro LED panel 200 ) operates in the light source mode, the micro LED panel 200 provides the light source to the reflective display panel 100 ; when the display device 10 (or the micro LED panel 200 ) When operating in the display mode, the micro LED panel 200 is a display panel. However, the present invention is not limited thereto, and according to other embodiments, the display device may also operate in a hybrid mode, in which the reflective display panel and the micro-LED panel display different images respectively. On the other hand, when the micro LED panel 200 is not enabled, the display device 10 can display the display image of the reflective display panel 100 through the illumination of external ambient light.

An adhesive layer (not shown) may optionally be disposed between the reflective display panel 100 and the micro LED panel 200 to connect the reflective display panel 100 and the micro LED panel 200 . For example, the adhesive layer can be pressure sensitive adhesive (Pressure Sensitive Adhesive, PSA), Optical Clear Adhesive (OCA), photosensitive water adhesive (UV adhesive), or Optical Clear Resin (OCR) ). In the present embodiment, the adhesive layer can be overlaid on the reflective display panel 100 and the micro LED panel 200 over the entire surface. That is, the reflective display panel 100 and the micro LED panel 200 can be combined in a direct bond manner. It should be noted that the present invention does not limit the joining method between the two panels. For example, the reflective display panel 100 can also be connected to the micro LED panel 200 through other suitable components, such as frame components.

Further, the reflective display panel 100 has a reflective surface 100R, and the micro LED panel 200 is overlapped on the side of the reflective display panel 100 where the reflective surface 100R is provided. Specifically, external environmental light can penetrate the micro LED panel 200 and be incident on the reflective surface 100R of the reflective display panel 100 . Next, after being reflected by the reflective surface 100R and passing through the micro LED panel 200 again, the display device 10 is emitted from the display surface DS to display the image to be displayed by the reflective display panel 100 . In particular, the visible light transmittance of the micro LED panel 200 is greater than 50%, which can effectively reduce the luminous energy loss of the external ambient light after passing through the LED panel, thereby increasing the luminous energy utilization rate of the display device 10. Helps to improve the overall display quality.

Referring to FIG. 2A , in this embodiment, the micro LED panel 200 includes a substrate 201 , a driving circuit layer 210 and a plurality of micro LED elements 220 . The substrate 201 has an opposite first surface 201 a and a second surface 201 b , the first surface 201 a faces the reflective surface 100R of the reflective display panel 100 , and the second surface 201 b can define the display surface DS of the display device 10 . The driving circuit layer 210 is disposed on the first surface 201 a of the substrate 201 and has a plurality of connection pads 215 . A plurality of micro light emitting diode elements 220 are disposed on the driving circuit layer 210 and electrically connected to the connection pads 215 respectively. In other words, the display surface DS and the reflective surface 100R are located on opposite sides of the micro light emitting diode element 220 respectively.

For example, the micro light emitting diode element 220 includes an epitaxial structure ES, a first electrode 221 and a second electrode 222 . In this embodiment, the first electrode 221 and the second electrode 222 can be respectively disposed on opposite sides of the epitaxial structure ES, and are electrically connected to the epitaxial structure ES; that is, the micro light emitting diode element 220 of this embodiment It may be a vertical type light emitting diode. However, the present invention is not limited to this, and according to other embodiments, the light emitting diode elements can also be adjusted to flip-chip type or lateral type light emitting diodes according to actual design requirements, and such light emitting diodes The element can also optionally include an insulating layer, and the first electrode and the second electrode located on the same side of the epitaxial structure penetrate through the insulating layer to electrically connect the epitaxial structure.

More specifically, the vertical projection of the micro LED element 220 on the substrate 201 of the present embodiment has a length, and the length is between 3 μm and 60 μm. For example, the length of the vertical micro-LED device can be between 3 micrometers to 15 micrometers, and the length of the flip-chip or horizontal micro-LED devices can be between 15 micrometers and 60 micrometers. On the other hand, the micro-LED device has a thickness in the normal direction of the substrate 201 , and the thickness is between 5 μm and 10 μm.

Further, a plurality of micro LED elements 220 may define a plurality of pixels of the micro LED panel 200 . In this embodiment, each micro LED element 220 may be defined as a pixel of the micro LED panel 200 , but the invention is not limited thereto. In other embodiments, the number of micro LED elements 220 included in each pixel of the micro LED panel may also be more than two. For example, in one embodiment, each pixel includes three micro light-emitting diodes (Micro LEDs), which are red micro-LEDs, blue micro-LEDs, and green micro-LEDs, respectively.

On the other hand, the micro LED element 220 is electrically connected to the driving circuit layer 210 through the connection pads 215 . In this embodiment, the micro light emitting diode panel 200 may further include a flat layer 230 covering the epitaxial structure ES, and the plurality of second electrodes 222 of the plurality of micro light emitting diode elements 220 are extended on the flat layer 230 to be connected to each other and formed There is a common electrode, but the present invention is not limited to this. The material of the planarization layer 230 includes inorganic materials (eg, silicon oxide, silicon nitride, silicon oxynitride, spin on glass (SOG), other suitable materials, or a stacked layer of at least two of the above materials), organic materials material, or other suitable materials, or a combination of the above.

The epitaxial structure ES may include a first-type semiconductor layer 223 , a light-emitting layer 224 and a second-type semiconductor layer 225 . The first type semiconductor layer 223 and the second type semiconductor layer 225 are located on opposite sides of the light emitting layer 224 respectively, and are electrically connected to the first electrode 221 and the second electrode 222 respectively. In this embodiment, the first-type semiconductor layer 223 is, for example, a P-type semiconductor, the second-type semiconductor layer 225 is, for example, an N-type semiconductor, and the light-emitting layer 224 may be a Multiple Quantum Well (MWQ) layer, but not This is the limit.

For example, when the micro LED panel 200 is enabled, the first electrode 221 can have a high potential, and the second electrode 222 can have a ground potential (Ground) or a low potential. The current generated by the potential difference between the first electrode 221 and the second electrode 222 enables the corresponding epitaxial structure ES and emits a (visible) beam. More specifically, the micro LED panel 200 can be controlled by the active elements of the driving circuit layer 210, for example, the plurality of first electrodes 221 have substantially the same high potential respectively, so that the emission intensity of the epitaxial structures ES is substantially The same light beam is used to form a uniform illumination light source; or the plurality of first electrodes 221 have different high potentials respectively, so that these epitaxial structures ES emit light beams of different intensities due to their respective driving currents, thereby forming images. The screen is seen by the human eye.

In this embodiment, the first electrode 221 and the second electrode 222 are, for example, light-transmitting electrodes, and the material of the light-transmitting electrodes includes metal oxides, such as indium tin oxide, indium zinc oxide, aluminum tin oxide oxide, aluminum zinc oxide, or other suitable oxide, or a stack of at least two of the foregoing. However, the present invention is not limited to this. In other embodiments, the first electrode 221 may also be a reflective electrode, and the material of the reflective electrode includes metal, alloy, nitride of metal material, oxide of metal material, and Oxynitride, or other suitable materials, or stacked layers of metallic materials and other conductive materials.

In this embodiment, the micro light emitting diode element 220 may also optionally include an encapsulation layer 240 covering the second electrode 222 of the micro light emitting diode element 220 . The material of the encapsulation layer 240 may include silicon nitride, aluminum oxide, aluminum nitride carbide, silicon oxynitride, acrylic resin, hexamethyldisiloxane (HMDSO) or glass.

Further, the reflective display panel 100 may include a display medium layer 105 overlapping the display surface DS, a plurality of third electrodes 130 and a plurality of fourth electrodes 140, and the third electrodes 130 and the fourth electrodes 140 are respectively located on the display medium Opposite sides of layer 105 . For example, the display medium layer 105 may include a plurality of microcapsules 110 and the electronic ink 120 filled in the microcapsules 110 . The microcapsules 110 may correspond to a plurality of third electrodes 130 (or fourth electrodes 140 ), respectively. The electronic ink 120 may selectively include a plurality of white particles 121 , a plurality of black particles 122 and a transparent liquid 123 , and one of the white particles 121 and the black particles 122 may be positively charged and the other negatively charged. However, the present invention is not limited thereto, and in some embodiments, the electronic ink may also contain charged particles of multiple different colors.

Specifically, the microcapsules 110 , the electronic ink 120 and the corresponding third electrodes 130 and the fourth electrodes 140 can define the pixel structure PX of the reflective display panel 100 . In this embodiment, the number of pixel structures PX of the reflective display panel 100 may be selectively different from the number of pixels of the micro light emitting diode panel 200 . For example, the number of pixel structures PX of the reflective display panel 100 may be greater than the number of pixels of the micro LED panel 200 , but the invention is not limited thereto. In other embodiments, the number of pixel structures PX of the reflective display panel may also be substantially equal to the number of pixels of the micro light emitting diode panel.

When the reflective display panel 100 is enabled, one of the third electrode 130 and the fourth electrode 140 of each pixel structure PX may have a positive potential, and the other may have a negative potential. For example, when the white particles 121 of the electronic ink 120 are negatively charged, the third electrode 130 of the pixel structure PX has a positive potential, so that the white particles 121 can move and accumulate toward the side of the microcapsule 110 adjacent to the third electrode 130; On the contrary, since the fourth electrode 140 of the pixel structure PX has a negative potential, the positively charged black particles 122 move toward the fourth electrode 140 and accumulate on the side of the microcapsule 110 adjacent to the third electrode 130 . At this time, a side surface of the microcapsule 110 of the pixel structure PX adjacent to the third electrode 130 can define the reflective surface 100R of the reflective display panel 100 . On the contrary, when the third electrode 130 of the pixel structure PX has a negative potential, the positively charged black particles 122 move toward the third electrode 130 and accumulate on the side of the microcapsule 110 adjacent to the third electrode 130; at this time, the pixel structure PX The side of the microcapsule 110 adjacent to the third electrode 130 may define the absorption surface 100A of the reflective display panel 100 .

In this embodiment, the third electrode 130 and the fourth electrode 140 are, for example, light-transmitting electrodes, and the material of the light-transmitting electrodes includes metal oxides, such as indium tin oxide, indium zinc oxide, aluminum tin oxide oxide, aluminum zinc oxide, or other suitable oxide, or a stack of at least two of the foregoing. However, the present invention is not limited thereto. In other embodiments, the fourth electrode 140 may be a reflective electrode, and the material of the reflective electrode includes metal, alloy, nitride of metal material, oxide of metal material, metal material oxynitride, or other suitable materials, or stacked layers of metal materials and other conductive materials.

Further, the micro light-emitting diode element 220 and the pixel structure PX have a central axis AX1 and a central axis AX2, respectively. In this embodiment, the central axes AX1 of the micro LED elements 220 are offset from the central axes AX2 of the pixel structures PX in the normal direction of the display surface DS (ie the second surface 201b). Accordingly, the moiré produced by the visual superposition of the periodic structures of the two panels can be improved. However. The present invention is not limited to this, in other embodiments, the plurality of central axes AX1 of the plurality of micro light emitting diode elements 220 may also coincide with the plurality of central axes AX1 of the plurality of pixel structures PX; that is, the micro light emitting diode elements 220 May be aligned to the corresponding pixel structure PX.

On the other hand, there is a first period P1 between any two adjacent micro LED elements 220 (ie, the central axis AX1 ) of the micro LED panel 200 , and any two adjacent pixel structures PX (ie, the central axis AX1 ) of the reflective display panel 100 There is a second period P2 between the central axes AX2), and the first period P1 is an integral multiple of the second period P2. For example, in this embodiment, the first period P1 of the plurality of micro LED elements 220 is four times the second period P2 of the plurality of pixel structures PX. However, the present invention is not limited to this. According to other embodiments, the multiple relationship between the first period P1 of the plurality of micro light emitting diode elements 220 and the second period P2 of the plurality of pixel structures PX may also be based on actual design requirements (eg, the lighting area The size of the LED panel, the resolution of the LED panel, or the viewing angle requirement of the display device) can be adjusted to be doubled, doubled, tripled, or five times or more.

Various modes of operation of the display device 10 will be described below. Please continue to refer to FIG. 2A , when the operating environment of the display device 10 is bright, only the reflective display panel 100 is enabled to form the distribution of the reflective surface 100R (or the absorbing surface 100A) corresponding to the display screen, and pass the external The illumination of the ambient light forms a corresponding image beam and is seen by the human eye. For example, the external ambient light source can provide multiple light beams, wherein the light beam LB1 can be deposited by the electronic ink 120 of a pixel structure PX when incident on the micro LED panel 200 and transmitted to the display medium layer 105 of the reflective display panel 100 The plurality of white particles 121 on the side of the microcapsule 110 adjacent to the third electrode 130 are reflected to form a corresponding image light beam; while the other light beam LB2 can be transmitted to another pixel structure PX by the electronic ink of the pixel structure PX The plurality of black particles 122 deposited on the side of the microcapsule 110 adjacent to the third electrode 130 are absorbed and cannot be emitted from the reflective display panel 100 . In particular, since the transmittance of the micro LED panel 200 is greater than 50%, the light energy loss of the light beam after passing through the micro LED panel 200 can be effectively reduced, thereby increasing the light energy utilization rate of the display device 10, which is helpful for Improve the overall display quality.

Referring to FIG. 2B , when the operating environment of the display device 10 is dim or the directivity of the external ambient light is high, in order to increase the visibility of the reflective display panel 100 , the micro LED panel 200 can be enabled as a For auxiliary light source. That is, when the display device 10 operates in the light source mode, the micro LED panel 200 provides the light source to the reflective display panel 100 . For example, when the light beam LB1a emitted by the micro light emitting diode element 220 is transmitted to the display medium layer 105 of the reflective display panel 100, the electronic ink 120 of a pixel structure PX can be deposited on the microcapsule 110 adjacent to the third electrode 130 by the electronic ink 120 of the pixel structure PX. The plurality of white particles 121 on the side are reflected to form a corresponding image light beam; when another light beam LB2a is transmitted to another pixel structure PX, the electronic ink 120 of the pixel structure PX can be deposited on the microcapsule 110 adjacent to the third electrode by the electronic ink 120 of the pixel structure PX The plurality of black particles 122 on one side of the 130 are absorbed and cannot be emitted from the reflective display panel 100 .

It is particularly mentioned that, since the first electrode 221 in this embodiment is a reflective electrode, the light beam LB3a emitted by the micro light emitting diode element 220 toward the first electrode 221 can be reflected to the display medium layer 105 to form an image light beam (or absorbed ). On the other hand, when the micro LED panel 200 is used as the auxiliary light source, the light beam intensities provided by the plurality of micro LED elements 220 are substantially the same, but the invention is not limited to this. In other embodiments, the plurality of miniature light-emitting diode elements 220 can also provide illumination beams with different intensities correspondingly according to the pixel gray-scale distribution of the reflective display panel 100, so as to achieve the effect of local dimming, and then Improved (dynamic) contrast performance of display devices.

Further, when the micro LED panel 200 of the display device 10 is used as a display panel, the pixel structure PX in the partial area where the reflective display panel 100 and the micro LED elements 220 overlap can define the reflection of the reflective display panel 100 The surface 100R (that is, the local area is the reflection area of the reflective display panel 100 ), and the pixel structure PX located outside the local area defines the absorption surface 100A of the reflective display panel 100 , as shown in FIG. 2C . In other words, when the micro LED panel 200 is used as a display panel, the reflective display panel 100 may have a plurality of reflection regions and a plurality of light absorption regions, and the reflection regions and the light absorption regions are arranged alternately.

Following the above, the plurality of micro LED elements 220 can emit light beams with different intensities (ie, image light beams), which are respectively reflected by the plurality of reflective regions of the reflective display panel 100 and then transmitted to the user to form a display screen. In this embodiment, two pixel structures PX may be provided in a local area of the reflective display panel 100 corresponding to the micro light emitting diode elements 220 , but the invention is not limited to this. In other embodiments, the number of pixel structures PX in the local area can also be adjusted according to actual design requirements (eg, the resolution of the reflective display panel or the viewing angle range of the display device).

In particular, since the arrangement period of the micro LED elements 220 is greater than the arrangement period of the pixel structure PX, the display resolution of the micro LED panel 200 can be smaller than that of the reflective display panel 100 to meet the minimum display resolution requirements. requirements, but the present invention is not limited to this. In other embodiments, as shown in FIG. 3 , at least one micro light emitting diode element 220 - 1 is disposed between any two adjacent microcapsules 110 of the reflective display panel 100 . That is to say, the display resolution of the micro LED panel 200 - 1 of the display device 10A can also be substantially equal to the display resolution of the reflective display panel 100 or greater than that of the reflective display panel 100 .

Hereinafter, other embodiments will be listed to describe the present disclosure in detail, wherein the same components will be marked with the same symbols, and the description of the same technical content will be omitted.

4 is a cross-sectional view of a display device according to a third embodiment of the present invention. Referring to FIG. 4 , the main difference between the display device 11 of this embodiment and the display device 10 of FIG. 2C is that the composition of the connection pads is different. In this embodiment, the connection pads 215A of the driving circuit layer 210 may have a specific transmittance, for example, a light transmittance of less than 50%; that is, the connection pads 215A of this embodiment may be used for light reduction pattern. Specifically, when the micro LED panel 200A is used as a display panel, the light beam LB4a emitted by the micro LED element 220A toward the connection pad 215A can be partially transmitted to the user directly through the connection pad 215A. Accordingly, the utilization rate of light energy when the micro LED panel 200A is used for display can be further increased. Further, the display device 11 can also operate in a hybrid mode. At this time, the micro LED panel 200A and the reflective display panel 100 display different images (not shown), respectively.

It is particularly mentioned that when the micro LED panel 200A is used as the illumination light source, the micro LED element 220A can provide the illumination beam with a small output power. Therefore, the light beam LB4a transmitted toward the outside is not easily noticed by the user after passing through the dimming pattern (ie, the connection pad 215A), which reduces the visibility of the light source (ie, the micro LED element 220A). However, the present invention is not limited thereto, and according to other not shown embodiments, the dimming pattern may also be other components different from the connection pads, and the light emitting diode element may be located between the reflective display panel and the dimming pattern.

5 is a cross-sectional view of a display device according to a fourth embodiment of the present invention. Referring to FIG. 5 , the main differences between the display device 11A of the present embodiment and the display device 11 of FIG. 4 are: different types of micro-LED elements and different configurations of dimming patterns. In this embodiment, the micro LED element 220A is, for example, a lateral type micro LED or a flip-chip type micro LED, and is electrically connected to the two connection pads 215B of the driving circuit layer 210A .

Further, the driving circuit layer 210A of the miniature light emitting diode panel 200B has a plurality of active elements T, and the method for forming the active elements T may include: sequentially forming a gate G and a gate insulating layer on the first surface 201 a of the substrate 201 GI, the semiconductor pattern SC, the source electrode S, the drain electrode D and the flat layer PL, wherein a connection pad 215B electrically connected with the micro light emitting diode element 220A penetrates through the flat layer PL and is electrically connected to the drain electrode D of the active element T. For example, the active element T of the driving circuit layer 210A can be used to control the driving current of the micro light emitting diode element 220A, but not limited thereto.

It is worth mentioning that the drain D and the connection pad 215B of the active element T in this embodiment can respectively have specific transmittances; that is, the drain D and the connection pad 215B of the active element T can be used as Light reduction pattern. However, the present invention is not limited to this, and in other embodiments, the source S or the gate G of the active element can also be used as a light reduction pattern according to the disposition relationship between the active element and the micro light emitting diode element. It should be noted that the gate G, the source S, the drain D, the gate insulating layer GI and the flat layer PL can respectively be any gate, any gate, any known to those skilled in the art for the active device array substrate. A source electrode, any drain electrode, any gate insulating layer and any flat layer can be realized, and the gate G, source S, drain D, gate insulating layer GI and flat layer PL can be implemented by any technical field. It can be formed by any method well known to those skilled in the art, so it is not repeated here.

6 is a cross-sectional view of a display device according to a fifth embodiment of the present invention. Referring to FIG. 6 , the main difference between the display device 12 of the present embodiment and the display device 11 of FIG. 4 is that the composition and arrangement of the micro-LED panels are different. In this embodiment, the miniature light-emitting diode panel 200C may further include a substrate 202 and a plurality of dimming patterns 250 . The dimming patterns 250 are disposed on the third surface 202a of the substrate 202, and are disposed overlapping the plurality of micro light emitting diode elements 220A. The third surface 202 a of the substrate 202 faces the reflective display panel 100 , and the fourth surface 202 b of the substrate 202 relative to the third surface 202 a can define the display surface DS of the display device 12 . In other words, the substrate 201 and the driving circuit layer 210A may be located between the reflective display panel 100 and the micro LED elements 220A.

In this embodiment, the micro LED element 220A is, for example, a lateral type micro LED or a flip-chip type micro LED, and is electrically connected to the two connection pads 215B of the driving circuit layer 210A . In this embodiment, the connection pads 215B and the dimming pattern 250 of the micro LED panel 200C may respectively have specific transmittances. For example, the light transmittance of the connection pads 215B of the driving circuit layer 210A may be greater than that of the dimming pattern 250, so as to enhance the light energy of the micro LED panel 200C as a light source (ie, the display device 12 operates in the light source mode). usage. On the other hand, since the types of the micro LED elements 220A in this embodiment are different from those of the micro LED elements 220 (eg, vertical micro LEDs) in FIG. 4 , the micro LED panel 200C may not have the type shown in FIG. 4 . The flat layer 230 and the encapsulation layer 240 .

7 is a cross-sectional view of a display device according to a sixth embodiment of the present invention. Referring to FIG. 7 , the main difference between the display device 13 of this embodiment and the display device 10 of FIG. 2B is that the composition of the reflective display panel is different. In this embodiment, the display medium layer 105A of the reflective display panel 100A may be a liquid crystal layer, and is sandwiched between the third electrode 130A and the fourth electrode 140 . That is to say, the reflective display panel 100A of this embodiment is a reflective liquid crystal display panel, and the surface 100Ra of the fourth electrode 140 can define the reflective surface of the reflective display panel 100A. On the other hand, the reflective display panel 100A further includes a polarizer 150 disposed between the third electrode 130A and the micro LED panel 200 .

For example, the light beam LB1 , the light beam LB2 from the outside, and the light beam LB1 a and the light beam LB3 a from the micro light emitting diode element 220 are polarized after passing through the polarizer 150 . Then, after passing through the display medium layer 105A, the light beams are reflected by the fourth electrode 140 and pass through the display medium layer 105A again to be transmitted to the polarizer 150 . At this time, the polarization states of the light beam LB1, the light beam LB1a and the light beam LB3a are not orthogonal to the transmission axis (not shown) of the polarizer 150 and can partially (or completely) pass through the polarizer 150; on the contrary, the light beam LB2 The polarization state of is absorbed by the polarizer 150 because it is orthogonal to the transmission axis of the polarizer 150 .

8 is a cross-sectional view of a partial region of a display device according to a seventh embodiment of the present invention. Referring to FIG. 8 , the main difference between the display device 20 of this embodiment and the display device 10 of FIG. 1 (or FIG. 2A ) is that the display device 20 of this embodiment further includes a touch element layer 300 . The touch element layer 300 is overlapped on the reflective display panel 100 and the micro LED panel 200 , and the micro LED panel 200 is located between the reflective display panel 100 and the touch element layer 300 .

In this embodiment, the touch element layer 300 may include a substrate 301 and driving electrodes 310 and sensing electrodes 320 disposed on opposite sides of the substrate 301 , but the invention is not limited thereto. For example, the driving electrodes 310 and the sensing electrodes 320 can be used to transmit the driving pulse signal and the sensing signal respectively, so as to realize the effect of multi-touch sensing, but the invention is not limited thereto. In this embodiment, the driving electrodes 310 and the sensing electrodes 320 are, for example, light-transmitting electrodes, and the material of the light-transmitting electrodes includes metal oxides, such as indium tin oxide, indium zinc oxide, and aluminum tin oxide. oxide, aluminum zinc oxide, or other suitable oxide, or a stack of at least two of the foregoing.

9 is a cross-sectional view of a display device according to an eighth embodiment of the present invention. Referring to FIG. 9 , the main difference between the display device 21 of this embodiment and the display device 20 of FIG. 8 is that the configuration of the touch element layer is different. In this embodiment, the driving electrodes 310A and the sensing electrodes 320A of the touch element layer 300A are disposed on the first surface 201 a of the substrate 201 . The driving circuit layer 210 is located on the touch element layer 300A, and the driving electrodes 310A (or the sensing electrodes 320A) do not overlap the micro LED elements 220 in the normal direction of the first surface 201a. Accordingly, the overall thickness of the display device 21 with touch function can be further reduced. In this embodiment, the driving electrodes 310A and the sensing electrodes 320A may selectively belong to the same film layer, but the invention is not limited thereto.

To sum up, in the display device according to an embodiment of the present invention, the configuration relationship between the light-emitting diode panel and the reflective display panel can increase the operation flexibility of the reflective display panel, which helps to improve the display device for different usage scenarios operational adaptability. On the other hand, the penetration rate of the LED panel is greater than 50%, which can effectively reduce the external ambient light and the light energy loss of the light beam reflected by the self-reflection display panel after passing through the LED panel, thereby increasing the light energy of the display device. The usage rate helps to improve the overall display quality.

Claims (16)

1. A display device having a display surface, the display device comprising:

a reflective display panel having a reflective surface; and

the miniature light emitting diode panel, overlap set up in reflective display panel, the miniature light emitting diode panel is equipped with the display surface, and include:

the drive circuit layer is positioned between the reflective display panel and the display surface; and

a plurality of micro light emitting diode elements electrically connected to the driving circuit layer,

the display surface and the reflection surface are respectively positioned at two opposite sides of the plurality of micro light-emitting diode elements, and the visible light penetration rate of the micro light-emitting diode panel is more than 50%.

2. The display device according to claim 1, wherein the reflective display panel comprises a plurality of pixel structures, a first period is provided between any two adjacent micro light emitting diode devices, a second period is provided between any two adjacent pixel structures, and the first period is an integer multiple of the second period.

3. The display device of claim 1, wherein the reflective display panel comprises a plurality of pixel structures overlapping the display surface, and the plurality of pixel structures are staggered from the plurality of micro light emitting diode elements in a normal direction of the display surface.

4. The display device of claim 3, wherein the micro light emitting diode panel further comprises:

a plurality of pixels respectively having at least one of the micro light emitting diode elements, wherein the number of the plurality of pixel structures of the reflective display panel is different from the number of the plurality of pixels of the micro light emitting diode panel.

5. The display device of claim 4, wherein the number of the plurality of pixel structures of the reflective display panel is greater than the number of the plurality of pixels of the micro light emitting diode panel.

6. The display device according to claim 4, wherein each of the pixels has a red micro light emitting diode, a blue micro light emitting diode, and a green micro light emitting diode.

7. The display device of claim 1, wherein the micro light emitting diode panel further comprises:

and the plurality of light reduction patterns are overlapped and arranged on the plurality of micro light-emitting diode elements, wherein the plurality of micro light-emitting diode elements are positioned between the reflective display panel and the plurality of light reduction patterns.

8. The display device according to claim 7, wherein the driver circuit layer comprises:

and the connecting pads are overlapped and arranged on the micro light-emitting diode elements, wherein the micro light-emitting diode elements are jointed with the connecting pads, and the connecting pads are the dimming patterns.

9. The display device according to claim 1, further comprising:

and the touch control element layer is overlapped and arranged on the reflective display panel and the micro light-emitting diode panel, wherein the micro light-emitting diode panel is positioned between the touch control element layer and the reflective display panel.

10. The display device of claim 1, wherein the micro light emitting diode panel further comprises:

and the touch control element layer is arranged between the display surface and the plurality of micro light-emitting diode elements and comprises a driving electrode and a sensing electrode.

11. The display device according to claim 10, wherein the micro light emitting diode panel further comprises a substrate, the touch element layer is disposed on a first surface of the substrate, and the driving circuit layer is disposed on the touch element layer.

12. The display device of claim 11, wherein the substrate of the micro light emitting diode panel is provided with the display surface, and the display surface is opposite to the first surface.

13. The display device of claim 1, wherein the micro light-emitting diode panel further comprises a substrate, the driver circuit layer is disposed on a first surface of the substrate, the plurality of micro light-emitting diode elements are bonded on the driver circuit layer, and the substrate and the driver circuit layer are between the reflective display panel and the plurality of micro light-emitting diode elements.

14. The display device of claim 13, wherein the micro light emitting diode panel further comprises a plurality of light reduction patterns overlapping the plurality of micro light emitting diode elements, and the plurality of micro light emitting diode elements are located between the reflective display panel and the plurality of light reduction patterns.

15. The display device of claim 1, wherein the micro light emitting diode panel provides light to the reflective display panel when operating in a light source mode, and the micro light emitting diode panel functions as a display panel when operating in a display mode.

16. The display device of claim 15, wherein the micro light emitting diode panel and the reflective display panel respectively display different images when operating in a hybrid mode.

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