Patent Application
20190245006
This application claims priority to TW Application Serial Number 107103892, filed Feb. 2, 2018, which is herein incorporated by reference.
The present disclosure relates to a display device. More particularly, the present disclosure relates to a micro LED display device.
Recently, a display device has been rapidly developed as an important human-machine interface. A portable electronic device, a computer or a television can represent complicated messages through the display device.
Owing to the demands on the large visible area, compact volume and low energy consumption, a liquid crystal display (LCD) device is getting more popular and has become a mainstream. A conventional LCD device 100 is shown in
However, the power efficiency and the brightness (contrast) of such kind of LCD device 100 is low because only few lights emitted from the backlight module 111 can pass through the liquid crystal layer 116. Furthermore, the manufacturing processes of the transistor layer 114 are complicated thereby increasing the manufacturing cost. A kind of OLED device has been reached to the market as an alternative of the LCD device 100. Although the OLED device has larger viewing angle then the conventional LCD device 100, however, issues such as light color flashing and light color decay still exist and will cause a short lifetime.
Therefore, there is a need to develop a display device having high power efficiency, large viewing angle and long lifetime.
According to one aspect of the present disclosure, a micro LED display device is provided. The micro LED display device includes a micro LED array, a light transmission layer, a color filter and a polarizer. The micro LED array includes a plurality of micro LEDs. The light transmission layer is located above the micro LED array. The color filter is located above the light transmission layer. The polarizer is located above the color filter.
In one example, the micro LED display device further includes an electrode layer, wherein the electrode layer drives the micro LED array to emit lights.
In one example, the micro LED display device further includes a first substrate and a second substrate, wherein the first substrate is located between the light transmission layer and the color filter, and the second substrate is located between the color filter and the polarizer.
In one example, the light transmission layer includes a quantum dot film, a polarizer film, a light enhancing film or a diffusion film.
In one example, the color filter includes a plurality of sub-pixel units; a color of each of the sub-pixel units is corresponded to a red color, a green color or a blue color.
In one example, a light color emitted from each of the micro LEDs includes a red light color, a green light color or a blue light color, and a color of each of the sub-pixel units is corresponded to the light color of each of the micro LEDs.
In one example, each of the micro LEDs emits a single light color.
In one example, each of the sub-pixel units of the color filter is departed by a mask.
In one example, each of the micro LEDs is aligned correspondingly to each of the sub-pixel units.
In one example, the sub-pixel units of the color filter are aligned in a linear shape, a square shape, a triangle shape or a mosaic shape.
The present disclosure can be more fully understood by reading the following detailed description of the embodiment, with reference made to the accompanying drawings as follows:
The operation mechanism of the micro LED display device 200 is then described. The micro LED array 212 includes a plurality of micro LEDs 212a which are aligned in order. Each of the micro LEDs 212a is electrically driven by the electrode layer 211, and can emit a light spontaneously. The electrode layer 211 can be made from conductive materials (metal or other materials), and can provide the required electric power. The lights emitted from the micro LED array 212 pass through the light transmission layer 213 located above. The micro LED 212a is commonly an inorganic LED, and the light emitted therefrom is commonly a point light source. Although the micro LEDs 212a can be aligned together to form an array to provide a large-area surface light source, however, controlling the alignment of the micro LEDs is still a challenge. In the present disclosure, the light transmission layer 213 can include a quantum dot film, a polarizer film, a light enhancing film, a diffusion film or a combination thereof. Therefore, a light shape of the light passed through the light transmission layer 213 can be enlarged for providing a uniformity surface light source.
For generating a color variation, the color filter 215 is disposed above the light transmission layer 213. It is known that an image is constructed by a plurality of pixels. The color filter 215 includes a plurality of sub-pixel units 215a. A single pixel can be formed by combining some of the sub-pixels 215a. For example, in a three primary color system, a sub-pixel unit 215a corresponded to a red color, a sub-pixel unit 215a corresponded to a green color and a sub-pixel unit 215a corresponded to a blue color are combined to form a single pixel. In a four primary color system, a sub-pixel unit 215a corresponded to a red color, a sub-pixel unit 215a corresponded to a green color, a sub-pixel unit 215a corresponded to a blue color and a sub-pixel unit 215a corresponded to a yellow color are combined to form a single pixel. In a six primary color system, a sub-pixel unit 215a corresponded to a red color, a sub-pixel unit 215a corresponded to a green color, a sub-pixel unit 215a corresponded to a blue color, a sub-pixel unit 215a corresponded to a cyan color, a sub-pixel unit 215a corresponded to a purple color and a sub-pixel unit 215a corresponded to a yellow color are combined to form a single pixel. A better color saturation and color reproduction can be achieved while using more sub-pixel units 215a with different colors. Furthermore, an alignment form of the sub-pixel units 215a also has influence on the color saturation. In other word, the sub-pixel units 215a of the color filter 215 can be aligned in a linear shape, a square shape, a triangle shape or a mosaic shape fir obtaining different color saturation.
A color variation is formed when a light passes through the color filter 215, and the micro LED array 212 is used to provide a required light source. The micro LED array 212 includes a plurality of micro LEDs 212a, and each of the micro LEDs 212a is aligned correspondingly to each of the sub-pixel units 215a of the color filter 215. Each of the micro LEDs 212a can emit the same or different light color. In one example, if the sub-pixel units 215a of the color filter 215 uses a three primary color system, a light color emitted from each of the micro LEDs includes a red light color, a green light color or a blue light color.
The polarizer 217 is used for generating a brightness variation (gray scale). A polarization angle and a polarization direction of a light can be adjusted when the light passes through the polarizer 217. Thus, the brightness variation (gray scale) can be adjusted for producing a colorful illumination as a natural light.
In the micro LED display device 200, 300, the emitted light is provided by the micro LED array 212, 312, and the micro LED array 212, 312 includes a plurality of micro LEDs 212a, 312a which are made of inorganic materials. The mechanism of color Illumination of such micro LED display device 200, 300 is significantly different from the conventional LCD device. Therefore, in the micro LED display device 200, 300 of the present disclosure, the backlight controlling structure can be simplified thereby reducing the manufacturing cost. Furthermore, the micro LED display device 200, 300 of the present disclosure has higher power efficiency, wider viewing angle and longer lifetime.
Although the present disclosure has been described in considerable detail with reference to certain embodiments thereof, other embodiments are possible. Therefore, the spirit and scope of the appended claims should not be limited to the description of the embodiments contained herein.
It will be apparent to those skilled in the art that various modifications and variations can be made to the structure of the present disclosure without departing from the scope or spirit of the disclosure. In view of the foregoing, it is intended that the present disclosure cover modifications and variations of this disclosure provided they fall within the scope of the following claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 107103892 | Feb 2018 | TW | national |
