CN212515219U

CN212515219U - Micro-display device

Info

Publication number: CN212515219U
Application number: CN202021032207.4U
Authority: CN
Inventors: 杜晓松; 郭丰; 周文斌; 张峰; 孙剑; 高裕弟
Original assignee: Kunshan Mengxian Electronic Technology Co ltd
Current assignee: Kunshan Mengxian Electronic Technology Co ltd
Priority date: 2020-06-08
Filing date: 2020-06-08
Publication date: 2021-02-09
Anticipated expiration: 2030-06-08

Abstract

The utility model discloses a little display device. According to the micro-display device, the sensing layer, the pixel definition layer and the light emitting layer are arranged on the driving back plate, and the sensing layer can recognize and sense the movement of the preset target and output a signal corresponding to the movement of the preset target. The driving back plate can acquire a signal which is output by the sensing layer and corresponds to the movement of the preset target from the second electrode, and outputs a driving signal to the first electrode according to the signal to control the light emitting layer to emit light, so that the picture display of the micro-display device is controlled according to the dynamic tracking of human eyes. Be applied to VR/AR with the little display device of this application and show, can greatly strengthen human-computer interaction performance. The pixel definition layer comprises a plurality of first openings and a plurality of second openings to define a light emitting layer area of the light emitting display pixel sub-unit, so that light emitting layers are respectively arranged in the first openings, the physical limit of the existing evaporation patterning is favorably broken through, and high-pixel-density display can be realized.

Description

Micro-display device

Technical Field

The embodiment of the utility model provides a relate to and show technical field, especially relate to a little display device.

Background

Virtual Reality (VR) is a technique in which a computer simulates a Virtual environment to give the human an immersive environment. Augmented Reality (AR), a technique that skillfully fuses virtual information with the real world.

At present, the display device based on AR/VR has the problems of poor human-computer interaction performance, easy vertigo, insufficient immersion and poor display effect.

SUMMERY OF THE UTILITY MODEL

An embodiment of the utility model provides a micro display device to realize human-computer interaction performance's reinforcing and high pixel density's demonstration.

The embodiment of the utility model provides a little display device, this little display device includes:

the driving back plate is provided with a plurality of first electrodes and a plurality of second electrodes;

the pixel definition layer comprises a plurality of first openings and a plurality of second openings, the first electrodes and the light emitting layers are positioned in the first openings, and the second electrodes and the sensing layer are positioned in the second openings;

the whole common electrode layer covers the light emitting layer and the sensing layer, the light emitting layer is positioned between the first electrode and the common electrode, and the sensing layer is positioned between the second electrode and the common electrode layer;

the driving back plate acquires a signal on the second electrode and outputs a driving signal to the first electrode so as to control the light-emitting layer to emit light according to a signal which is output by the sensing layer and moves corresponding to a preset target.

Optionally, the light emitting layer includes a red light emitting unit, a green light emitting unit, and a blue light emitting unit; the sensing layer comprises a plurality of sensing units;

the red light-emitting unit, the green light-emitting unit, the blue light-emitting unit and the sensing unit are distributed in a shape of Chinese character tian.

Optionally, the 4 red light emitting units, the 4 green light emitting units, or the 4 blue light emitting units are distributed in a grid shape.

Optionally, the sensor further comprises a microlens array layer, the microlens array layer is located on one side of the sensing layer, which is far away from the driving back plate, and the microlens array layer is arranged corresponding to the sensing layer.

Optionally, a third opening is further disposed between adjacent first openings, and the common electrode covers the third opening.

Optionally, the liquid crystal display further comprises a thin film packaging layer, wherein the thin film packaging layer is positioned on one side of the common electrode, which is far away from the driving back plate, and covers the common electrode.

Optionally, the micro-display device further comprises a package cover plate, the package cover plate is fixed on one side, away from the driving back plate, of the thin film package layer through UV glue, and the UV glue is arranged on a frame of the micro-display device.

Optionally, the sensing layer comprises any one of a-Si, p-Si or reduced graphene oxide.

The embodiment of the utility model provides a micro-display device, including the drive backplate, be provided with a plurality of first electrodes and a plurality of second electrode on the drive backplate. And a sensing layer, a pixel definition layer and a light emitting layer are further arranged on the driving backboard. The sensing layer can recognize and sense the movement of the preset target (for example, the movement of light reflected by human eyes and the movement of light intensity), and output a signal corresponding to the movement of the preset target (for example, the corresponding signal may include pupil position information and eye movement data of human eyes), so that the driving back plate can acquire the signal, output by the sensing layer, corresponding to the movement of the preset target from the second electrode, and output a driving signal to the first electrode according to the signal to control the light emitting layer to emit light, thereby controlling the image display on the display side of the micro-display device. Therefore, will the utility model discloses in micro-display device is applied to VR/AR and shows, can realize controlling the picture display that VR/AR shows according to the dynamic tracking to the eyes, the utility model discloses the man-machine interaction performance that has strengthened VR/AR and show greatly, and reduce user's dizzy sense and promote to immerse and feel. The pixel definition layer comprises a plurality of first openings and a plurality of second openings so as to define the light-emitting layer area of the light-emitting display pixel subunit, and the light-emitting layers are respectively arranged in the first openings, so that the physical limit of the existing evaporation patterning is favorably broken through, the display with high pixel density is realized, and the display effect is greatly optimized.

Drawings

Fig. 1 is a schematic cross-sectional view of a micro display device according to an embodiment of the present invention;

fig. 2 is a schematic top view of a display panel according to an embodiment of the present invention;

fig. 3 is a schematic cross-sectional view of a micro display device according to an embodiment of the present invention;

fig. 4 is a schematic flow chart illustrating a method for manufacturing a micro display device according to an embodiment of the present invention;

fig. 5-7 are schematic structural diagrams of the display panel provided by the embodiment of the present invention in each manufacturing step.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

The embodiment of the utility model provides a little display device, it is applicable in VR/AR shows, and little display device can be Organic Light-Emitting Diode (OLED) display panel or Organic Light-Emitting Diode little display panel (Micro-OLED).

Fig. 1 is a schematic cross-sectional view of a micro display device according to an embodiment of the present invention, please refer to fig. 1, the micro display device includes: a driving back plate 10, wherein a plurality of first electrodes 20 and a plurality of second electrodes 30 are arranged on the driving back plate 10; the pixel structure comprises a sensing layer 31, a pixel defining layer 50 and a light emitting layer 21, wherein the pixel defining layer 50 comprises a plurality of first openings 51 and a plurality of second openings 52, a first electrode 20 and the light emitting layer 21 are positioned in the first openings 51, and a second electrode 30 and the sensing layer 31 are positioned in the second openings 52; the common electrode 60, the common electrode 60 covers the luminescent layer 21 and the sensing layer 31 in a whole layer, the luminescent layer 21 is positioned between the first electrode 20 and the common electrode 60, and the sensing layer 31 is positioned between the second electrode 30 and the common electrode 60; the driving backplane 10 acquires the signal on the second electrode 30 and outputs a driving signal to the first electrode 20 to control the light-emitting layer 21 to emit light according to the signal corresponding to the movement of the predetermined target output by the sensing layer 31.

Specifically, referring to fig. 1, the driving backplate 10 may include a silicon substrate, which can provide buffering, protection, or support for the micro display device. The driving backplane 10 may be disposed therein with a driving circuit, which may include a thin film transistor and a plurality of signal traces. The driving back plate 10 is provided with a plurality of first electrodes 20 and a plurality of second electrodes 30, and the first electrodes 20 and the second electrodes 30 can be electrically connected with the driving circuit in the driving back plate 10 through the via holes 11 on the driving back plate 10.

On the basis, referring to fig. 1, a sensing layer 31 is disposed on a side of the second electrode 30 away from the driving backplate 10, and the sensing layer 31 is disposed on the second electrode 30 and covers the second electrode 30. The material of the sensing layer 31 may be amorphous Silicon (a-Si), Low Temperature polysilicon (LTPS, also called p-Si), or reduced Graphene Oxide (rGO). Optionally, after the sensing layer 31 is disposed on a side of the second electrode 30 away from the driving backplate 10, referring to fig. 1, a plurality of third electrodes 40 are further disposed, the third electrodes 40 are disposed on a side of the first electrode 20 away from the driving backplate 10 and cover the first electrode 20, and the third electrodes 40 are disposed on a side of the sensing layer 31 away from the driving backplate 10 and cover the sensing layer 31. Preferably, the material of the third electrode 40 includes transparent Indium Tin Oxide (ITO).

A pixel defining layer 50 is disposed, the pixel defining layer 50 includes a plurality of first openings 51 and a plurality of second openings 52, wherein the first electrode 20 is located in the first openings 51, the second electrode 30 and the sensing layer 31 are located in the second openings 52, and optionally, the first electrode 20 and the third electrode 40 are located in the first openings 51, and the second electrode 30, the sensing layer 31 and the third electrode 40 are located in the second openings 52. The pixel defining layer 50 is arranged to define the light emitting layer area of the light emitting display pixel sub-units of the micro-display device, one light emitting display pixel sub-unit being equivalent to one sub-pixel of the micro-display device. Preferably, the material of the pixel defining layer 50 includes silicon dioxide (SiO 2).

Further, the light emitting layer 21 is disposed in the plurality of first openings 51 of the pixel defining layer 50, respectively, and the light emitting layer 21 may cover the third electrode 40. The light-emitting layer 21 may include three kinds of organic materials of red, green and blue OLEDs, and different organic materials are respectively disposed in different first openings 51, so as to form three kinds of light-emitting display pixel sub-units of red, green and blue of the micro-display device, one red light-emitting display pixel sub-unit, one green light-emitting display pixel sub-unit and one blue light-emitting display pixel sub-unit may constitute one light-emitting display pixel unit, and a plurality of light-emitting display pixel units implement multi-color display on the display side of the micro-display device.

And, a common electrode 60 is provided, the common electrode 60 entirely covering the light emitting layer 21 and the sensing layer 31. Preferably, the material of the common electrode 60 may be a semitransparent conductive material, such as aluminum, silver or other metal materials. Optionally, a third opening 53 is further disposed between the adjacent first openings 51 in the pixel defining layer 50, and the common electrode 60 covers the third opening 53. Optionally, a fourth opening 54 is further disposed between the first opening 51 and the second opening 52 of the pixel defining layer 50, and the common electrode 60 covers the fourth opening 54. By arranging the common electrode 60 in this way, in addition to signal transmission to the light-emitting display pixel units and the sensing layer, light crosstalk between the light-emitting display pixel subunits can be avoided, and light crosstalk occurs between the light-emitting of the light-emitting display pixel subunits and the light entering of the sensing layer 31, so that the display effect of the micro display device is ensured, and the eyeball tracking accuracy during human eye dynamic tracking is ensured.

To sum up, the embodiment of the utility model provides a little display device has following theory of operation: the sensing layer 31 recognizes and senses the movement of a preset target, such as light reflected from a human eye, and the movement of the preset target may be the movement of the light reflected from the human eye and the movement of light intensity, and the pupil position information and the eye movement data of the human eye may be further determined according to the movement of the light reflected from the human eye and the movement of the light intensity, and accordingly, the sensing layer 31 outputs a signal corresponding to the movement of the preset target, that is, outputs a signal corresponding to the pupil position information and the eye movement data of the human eye. The driving circuit acquires a signal corresponding to the movement of the preset target from the second electrode 30, and outputs a driving signal to the first electrode 20 according to the signal to control the light emitting layer 21 to emit light, thereby controlling the image display on the display side of the micro-display device. The light reflected from the human eye includes, but is not limited to, natural light, lamp light, and light emitted from the light emitting layer of the micro-display device.

Therefore, will the embodiment of the utility model provides a little display device is applied to during VR/AR shows, can realize controlling the picture display that VR/AR shows according to the dynamic tracking to the people's eye, greatly strengthens human-computer interaction performance, and reduces user's dizzy sense and promotes to immerse and feel. Illustratively, the man-machine interaction of applying the micro-display device provided by the embodiment of the invention to VR/AR display can be implemented in such a way that the pupil position information and the eye movement data of the human eye are determined: for example, if the human eye moves up and down, YES is indicated, and if the human eye moves left and right, NO is indicated; further, for example, when the low frequency blinking motion is determined, YES is indicated, and when the high frequency blinking motion is determined, NO is indicated; for example, when the human eye moves up and down, page turning up and down is indicated, and when the human eye moves left and right, page turning left and right or upper and lower menu selection is indicated. Therefore, the embodiment of the invention can replace traditional interaction processes such as touch control, mouse or keyboard input and the like according to the pupil position and the eye movement condition of human eyes, so that the man-machine interaction is more intelligent.

As a possible implementation manner of the present application, fig. 2 is a schematic top view structure diagram of a display panel according to an embodiment of the present invention, please refer to fig. 2, in which a light emitting layer 21 includes a red light emitting unit R, a green light emitting unit G, and a blue light emitting unit B; the sensing layer 31 includes a plurality of sensing units S; the red light-emitting unit R, the green light-emitting unit G, the blue light-emitting unit B and the sensing unit S are distributed in a grid shape. Preferably, the 4 red light emitting units R, the 4 green light emitting units G, or the 4 blue light emitting units B are distributed in a matrix shape.

Specifically, the red light emitting unit R can emit red monochromatic light corresponding to the red OLED organic material, that is, corresponding to the red light emitting display pixel sub-unit, the green light emitting unit G can emit green monochromatic light corresponding to the green red OLED organic material, that is, corresponding to the green light emitting display pixel sub-unit, and the blue light emitting unit B can emit blue monochromatic light corresponding to the blue red OLED organic material, that is, corresponding to the blue light emitting display pixel sub-unit, so as to implement multicolor display on the display side of the micro-display device.

The sensing layer 31 divides a plurality of sensing units S each capable of independently recognizing the movement of the sensing preset target. As shown in fig. 2, the red light-emitting unit R, the green light-emitting unit G, the blue light-emitting unit B, and the sensing unit S are distributed in a grid shape, and 1 red light-emitting unit R, 1 green light-emitting unit G, 1 blue light-emitting unit B, and 1 sensing unit S may form a light-emitting display pixel unit PX1 arranged in a grid shape in the micro-display device. Preferably, the 4 red light emitting units R, the 4 green light emitting units G, or the 4 blue light emitting units B are distributed in a matrix shape. Thus, preferably, 4 red light-emitting units R, 4 green light-emitting units G, 4 blue light-emitting units B, and 4 sensing units S may constitute one light-emitting display pixel unit PX2 arranged in a checkerboard pattern in the display panel. In this way, 4 light-emitting display sub-pixel units with the same color are arranged in a centralized manner, and 4 sensing units S are arranged in a centralized manner, in the manufacturing process of the micro-display device, the sensing layers 31 and the third electrodes 40 of the 4 sensing units S can be formed in one process, the light-emitting layers 21 of the 4 light-emitting display sub-pixels can be formed in one step through electrofluid printing, and the light-emitting display sub-pixel units with the same color are arranged in a ringing manner, so that the number of the light-emitting display pixel sub-units (namely the number of the sub-pixels of the micro-display device) in a unit area is increased, the physical limit of the existing evaporation patterning is broken through, the display with high pixel density is realized, and the real R, G, B three-color display is realized, so that the display effect is greatly optimized, the use of an optical filter is also avoided, and the light-emitting efficiency is further. Therefore, will the utility model discloses in little display device is applied to VR AR and shows, just can promote its biological identification performance well, improve and play up efficiency.

As a possible implementation manner of the present application, fig. 3 is a schematic cross-sectional structure view of a micro display device according to an embodiment of the present invention, please refer to fig. 3, the micro display device further includes a film encapsulation layer, and the film encapsulation layer is located on one side of the common electrode 60 away from the driving back plate 10 and covers the common electrode 60. Specifically, the thin film encapsulation layer may be an organic thin film, an inorganic thin film, or a pair of stacked inorganic thin films on the organic thin film, so as to implement encapsulation of the common electrode 60, the light emitting layer 21, and the sensing layer 31, prevent oxidation of materials of each layer, and ensure reliability of the manufacturing process.

Referring to fig. 3, the micro display device further includes a micro lens array layer 70 disposed on a side of the sensing layer 31 away from the driving backplane 10 and corresponding to the sensing layer 31. Specifically, the microlens array layer 70 may include a plurality of microlenses, i.e., the microlens array layer 70 is formed of a plurality of microlenses. The microlenses may be disposed in one-to-one correspondence with the aforementioned sensing units S, and preferably, each microlens covers one sensing unit S. The micro-lens can converge light of a preset target, for example, light reflected from a human eye, on the sensing unit S or the sensing layer 31, so as to facilitate the sensing layer 31 to perform recognition and sensing, and ensure high efficiency of tracking movement of the preset target, for example, an eyeball.

Referring to fig. 3, the micro display device further includes a package cover 80, the package cover 80 is fixed on a side of the thin film package layer away from the driving backplane 10 by UV glue, and the UV glue is disposed on a frame of the micro display device. Specifically, the package cover plate 80 may be a glass cover plate, and the glass cover plate is fixed on a side of the thin film package layer away from the driving backplane 10 by UV glue, so as to implement the packaging of the micro display device.

The embodiment of the utility model provides a still provide a little display device's preparation method, this little display device's preparation method can be used to prepare the little display device among the above-mentioned technical scheme, and fig. 4 is the embodiment of the utility model provides a little display device's preparation method's flow schematic diagram, fig. 5-fig. 7 are the embodiment of the utility model provides a display panel is at the schematic structure of each preparation step in. Referring to fig. 4, the method of manufacturing the micro display device includes:

and S10, forming a driving back plate, and forming a plurality of first electrodes and a plurality of second electrodes on the driving back plate.

Specifically, referring to fig. 5, the preparation of the driving back plate 10 is completed, the driving back plate 10 may include a silicon substrate, and the first electrode 20 and the second electrode 30 may be electrically connected to the driving circuit in the driving back plate 10 through the via hole 11 on the driving back plate 10.

And S20, forming a sensing layer, wherein the sensing layer covers the second electrode.

In particular, with continued reference to FIG. 5, a sensing layer 31 is grown on the second electrode 30, with the second electrode 30 acting as an anode for the sensing layer 31. At S20, forming a sensing layer, the sensing layer covering the second electrode further comprising: s21, with continued reference to fig. 5, a plurality of third electrodes 40 are formed, the third electrodes 40 are located on the side of the first electrode 20 away from the driving backplate 10 and cover the first electrode 20, and the third electrodes 40 are located on the side of the sensing layer 31 away from the driving backplate 10 and cover the sensing layer 31.

And S30, forming a pixel defining layer, wherein the pixel defining layer comprises a plurality of first openings and second openings, the first electrodes are positioned in the first openings, and the second electrodes and the sensing layer are positioned in the second openings.

Specifically, referring to fig. 6, a pixel definition layer 50 is grown and patterned on the driving backplate 10 using a yellow light and etching process to achieve high pixel density patterning.

S40, forming a light emitting layer in the first opening.

Specifically, referring to fig. 7, the red, green, and blue OLED organic materials are printed by an electrofluid process, so that the real display of the three light-emitting display pixel sub-units is completed, the use of an optical filter is avoided, and the light-emitting efficiency is improved.

S50, with continued reference to fig. 7, the common electrode 60 is formed, the common electrode 60 entirely covering the light-emitting layer 21 and the sensing layer 31.

At S50, forming a common electrode, the common electrode further including, after the entire layer covers the light emitting layer and the sensing layer: s51, with reference to fig. 7, forming a thin film encapsulation layer, where the thin film encapsulation layer is located on the side of the common electrode 60 away from the driving backplane 10 and covers the common electrode 60; s52, with reference to fig. 7, forming a microlens array layer 70, where the microlens layer is located on a side of the thin film encapsulation layer away from the driving backplate 10, corresponding to the sensing layer 31, and finally forming an encapsulation cover plate 80, where the glass encapsulation cover plate 80 is fixed on the side of the thin film encapsulation layer away from the driving backplate 10 by UV glue, so as to implement the encapsulation of the microdisplay device as shown in fig. 3.

The embodiment of the utility model provides a little display device's preparation method can be used to prepare the utility model discloses any technical scheme's display panel, therefore this preparation method also has the corresponding beneficial effect of display panel, and here is no longer repeated.

It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

Claims

1. A microdisplay device, comprising:

the common electrode covers the light emitting layer and the sensing layer in a whole layer, the light emitting layer is positioned between the first electrode and the common electrode, and the sensing layer is positioned between the second electrode and the common electrode layer;

the driving back plate acquires a signal on the second electrode and outputs a driving signal to the first electrode so as to control the light emitting layer to emit light according to a signal which is output by the sensing layer and corresponds to the movement of a preset target.

2. The micro-display device according to claim 1, wherein the light emitting layer comprises a red light emitting unit, a green light emitting unit, and a blue light emitting unit; the sensing layer comprises a plurality of sensing units;

3. The micro-display device of claim 2, wherein 4 of the red light-emitting units, 4 of the green light-emitting units, or 4 of the blue light-emitting units are distributed in a grid shape.

4. The microdisplay device of claim 1 further comprising a microlens array layer on the side of the sensing layer away from the driving backplane, the microlens array layer being disposed in correspondence with the sensing layer.

5. The microdisplay device of claim 1 wherein a third aperture is disposed between adjacent first apertures, and the common electrode covers the third aperture.

6. The microdisplay device of claim 1 further comprising a thin film encapsulant layer on the common electrode on a side away from the driving backplane and covering the common electrode.

7. The micro-display device of claim 6, further comprising a package cover plate, wherein the package cover plate is fixed to a side of the thin film package layer away from the driving backplane by a UV glue, and the UV glue is disposed on a frame of the micro-display device.

8. The microdisplay device of claim 1, wherein the sensing layer comprises any of a-Si, p-Si, or reduced graphene oxide.