Patent ID: 12198612

DETAILED DESCRIPTION

In order to learn features and functions of the present invention more clearly, please refer to the following embodiments and detailed descriptions.

In order to solve the problems of the conventional techniques mentioned above, a micro light-emitting diode (LED) display of the present invention is provided. The micro LED display includes a panel provided with a first display area and a second display area. A first pixel on the first display area includes a sub-pixel while a second pixel on the second display area includes a plurality of sub-pixels. The sub-pixel of the first pixel is corresponding to a control signal of a control unit and the plurality of sub-pixels of the second pixel is corresponding to another control signal of another control unit. The display with such structure solves the problems of conventional near-eye displays including greater power consumption and higher production cost.

Refer toFIG.1, a first embodiment according to the present invention is provided. A micro light emitting diode (LED) display1includes a panel10, a plurality of first pixel20, and a plurality of second pixel30while both the first pixels20and the second pixels30are disposed on the panel10.

Still refer toFIG.1, in this embodiment, the panel10is provided with a first display area A1and a second display area A2while the first display area A1is arranged at one side of the second display area A2. That means an edge of the first display area A1and an edge of the second display area A2are connected with each other to form a mixed display area. The first pixels20are arranged at the first display area A1and the first pixel20which includes a first sub-pixel22receives a first control signal. The respective first sub-pixels22of the first pixels20are spaced apart from one another on the first display area A1. Thereby the plurality of the first sub-pixels22is evenly distributed on the first display area A1. The second pixels30are disposed on the second display area A2and each of the second pixels30includes a plurality of second sub-pixels32. The second pixel30receives a second control signal. The respective second sub-pixels32of the second pixels30are spaced apart from one another on the second display area A2. Thereby the plurality of the second sub-pixels32is evenly distributed on the second display area A2. The single first sub-pixel22receives the single first control signal and emits light to form a pixel on the first display area A1while the plurality of the second sub-pixels32receive the single second control signal and emit light to form another pixel on the second display area A2. Thereby a first resolution shown on the first display area A1is larger than a second resolution shown on the second display area A2.

In this embodiment, the first control signal and the second control signal are both a part of area of the same image signal. The area of the first control signal is corresponding to the first display area A1and the area of the second control signal is corresponding to the second display area A2for corresponding to viewing angles of human eyes.

In this embodiment, there is a plurality of the first pixels20spaced apart from one another and disposed on the first display area A1. Similarly, there is also a plurality of the second pixels30spaced apart from one another and arranged at the second display area A2.

In this embodiment, the first sub-pixel22of the first pixel20on the first display area A1has a first pixel density and the second sub-pixels32of the second pixel30on the second display area A2have a second pixel density while the first pixel density is larger than the second pixel density.

In this embodiment, the second display area A2surrounds the first display area A1so that the first display area A1and the second display area A2are arranged concentrically. And the first display area A1is located at the center. In a preferred embodiment, the micro LED display1is applied to virtual reality (VR) displays, augmented reality (AR) displays, and mixed reality (MR) displays. The first display area A1is within a horizontal field of view (FOV) and a vertical FOV of human eyes.

In this embodiment, the plurality of the first pixels20is disposed on the first display area A1and the plurality of the second pixels30is arranged at the second display area A2, but not limited.

Refer toFIG.1andFIG.2, in this embodiment, the first sub-pixel22of the first pixels20includes a red light emitting device R, a green light emitting device G, and a blue light emitting device B for emitting light with different colors (including white light). For example, the red light emitting device R, the green light emitting device G, and the blue light emitting device B respectively can be a red micro light emitting diode (LED), a green micro LED, and a blue micro LED. Each of the second sub-pixels32of the second pixel30consists of a red light emitting device R, a green light emitting device G, and a blue light emitting device B for emitting light with different colors (including white light). For example, the red light emitting device R, the green light emitting device G, and the blue light emitting device B respectively can be a red micro LED, a green micro LED, and a blue micro LED, but not limited.

Refer toFIG.3AandFIG.3B, schematic drawings showing active control of a second embodiment are provided. As shown in the figures, this is the second embodiment which is formed based on the first embodiment mentioned above. In this embodiment, the first pixel20further includes a first control unit24which is electrically connected with the first sub-pixel22in the first pixel20and sending the first control signal to the first sub-pixel22for controlling and driving the first sub-pixel22to emit light. That means the single first control unit24controls the single first sub-pixel22correspondingly in the respective first pixels20.

In this embodiment, each of the second pixels30further includes a second control unit34which is electrically connected with the second sub-pixels32in the second pixel30and sending a second control signal to the second sub-pixels32for control and driving of the second sub-pixels32to emit light. That means the single second control unit34controls the plurality of second sub-pixels32correspondingly in the respective second pixels30. The second sub-pixels32of the second pixel30emit the light with the same wavelength (including white light). That means the second sub-pixels32of the second pixel30show the same image and form a single pixel.

In this embodiment, the first control unit24sends the first control signal to the red light emitting device R, the green light emitting device G, and the blue light emitting device B of the first sub-pixel22for controlling and driving the first sub-pixel22to emit light with different colors (including white light).

In this embodiment, the second control unit34sends the second control signal to the red light emitting device R, the green light emitting device G, and the blue light emitting device B of the respective second sub-pixels32at the same time for controlling and driving the second sub-pixels32to emit light with different colors (including white light).

In this embodiment, the single second control unit34controls the second sub-pixels32at the same time so that the number of control units on the second display area A2can be reduced. Thereby manufacturing cost of the micro LED display1is further lowered and a yield rate of the micro LED display1is improved.

In this embodiment, the first control unit24and the second control unit34drives the sub-pixels by active matrix. For example, a transistor array on a back panel of the micro LED display is used to control on/off of current and drive pixels. The first control unit24and the second control unit34can be silicon transistors, or thin-film transistors (TFT). The silicon transistor can be made quite tiny and transistors on the back panel produced have fine pitch, able to be applied to VR, AR, MR displays with high resolution. As to the TFT, it can be can be made of low-temperature polycrystalline silicon (LTPS) or indium gallium zinc oxide (IGZO). The TFT is produced on a substrate with larger size than a substrate for silicon transistors. Thus the cost per unit area is further reduced.

Refer toFIG.4AandFIG.4B, schematic drawings showing passive control of a third embodiment are provided. As shown in the figures, this is the third embodiment which is formed based on the first embodiment mentioned above. In this embodiment, the panel10further includes a column drive circuit50and a row drive circuit52. The column drive circuit50is electrically connected with the first sub-pixel22of the respective first pixels20and the second sub-pixels32of the respective second pixels30. The row drive circuit52is electrically connected with the first sub-pixel22of the respective first pixels20and the second sub-pixels32of the respective second pixels30. The column drive circuit50and the row drive circuit52send the first control signal to the first sub-pixel22included in the respective first pixel20. The column drive circuit50and the row drive circuit52send the second signal to the second sub-pixels32included in the respective second pixel30.

In this embodiment, the second sub-pixels32of the respective second pixel30receives the same control signal at the same time so that the amount of drive circuit used on the second display area A2is reduced and circuit layout area is also decreased. Thereby manufacturing cost of the micro LED display1is further reduced and a yield rate of the of the micro LED display1is increased.

In this embodiment, passive matrix is used. In an array, a P-electrode of each row of pixels is connected to a row data current source while a N-electrode of each column of pixels is connected to a column scan line for control of the first sub-pixel22of the respective first pixels20and the second sub-pixels32of the respective second pixels30to emit light. By the second control signal, the second sub-pixels32of the respective second pixels30remit the light with the same wavelength (including white light).

In this embodiment, the panel10further includes a drive member60which is electrically connected with the column drive circuit50and the row drive circuit52for transmission of the first control signal and the second control signal.

Refer toFIG.5, a schematic drawing showing light emitting of an embodiment is provided. As shown in the figure, the embodiment can be one of the three embodiments mentioned above. The respective first pixels20on the first display area A1can emit different light and generate a plurality of pixel points. Similarly, the respective second pixels30on the second display area A2can also emit different light and generate a plurality of pixel points. It should be noted that the second pixel30includes a plurality of second sub-pixels32which are combined to form one pixel point. Thus a second resolution of an image shown on the second display area A2is smaller than a first resolution of an image shown on the first display area A1. The second display area A2is corresponding to an area where human eyes provide poor judgement so that power consumption of the second display area A2with lower resolution is further reduced. Moreover, the second display area A2with lower demand for the control units (such as the second and the third embodiments) can also reduce manufacturing cost of the micro LED display1.

Refer toFIG.6, a schematic drawing showing pixel densities of an embodiment according to the present invention is provided. This embodiment can correspond to the above first, the second and the third embodiments. In this embodiment, the first sub-pixel22of the first pixel20on the first display area A1has a first pixel density while the second sub-pixels32of the second pixel30on the second display area A2has a second pixel density. The first pixel density is larger than the second pixel density. That means an interval between the adjacent two second sub-pixels32distributed on the second display area A2is larger than an interval between the two adjacent first sub-pixels22distributed on the first display area A1. The above structure further reduces the amount of light emitting devices used on the second display area A2. Thereby the manufacturing cost is decreased and a yield rate of the display is raised.

Refer toFIG.7, a schematic drawing showing a third display area of an embodiment according to the present invention is provided. As shown in the figure, the micro LED display1further includes a third display area A3on which at least one third pixel40is disposed. That means the third pixel40is arranged at the third display area A3, including a plurality of third sub-pixels42, and receiving a third control signal. The rest components of this embodiment are the same as those of the first embodiment mentioned above.

In this embodiment, the first display area A1surrounds the third display area A3while the second display area A2surrounds the first display area A1. The first display area A1, the second display area A2, and the third display area A3are respectively corresponding to 5°-30°, 30°˜60°, and 0°˜5° viewing angle of human eyes. The third sub-pixels42of the third pixel40on the third display area A3have a third pixel density which is larger than the second pixel density while the first pixel density is larger than the third pixel density. Thereby the pixel density is in a sparse-dense-sparse pattern from a periphery to a center point of the panel10and the design is not only for adaptation of human eyes' viewing angles but also for reduction of manufacturing cost of the panel10.

The maximum horizontal viewing angle of both eyes is 188 degrees and a person's field of vision overlaps at 124 degrees for both eyes. That means within certain range human eyes can see, users only have stereoscopic vision for objects within the 124°. A central axis from fixation points of eyes to the middle of the eyes is defined as 0°. A visual angle of the left and right sides of the human eyes is 62° and −62°. The comfortable field of vision of one eye is −30°˜30° degrees. Objects within this range of 60° can be seen clearly and focused. A peripheral zone out of the viewpoint about 30° (or −30°) is called peripheral vision (out of the corner of the eyes). That's the area the eyes are not so sensitive to and unable to see things clearly. Thus in the above embodiment, the first display area A1with the highest pixel density is corresponding to 5°˜30° viewing angle of human eyes while the second display area A2with the lowest pixel density is corresponding to 30°˜60° viewing angle of human eyes. Thereby both manufacturing cost and energy consumption of the display can be reduced.

While being applied to near-eye displays, the panel10of the display has an area between the eyes (in front of the nose bridge) which users are unable to see clearly. Thereby the above embodiment is further provided with the third display area A3with the second lowest pixel density and corresponding to 0°˜5° viewing angle of the eyes in order to reduce manufacturing cost and power consumption of the display.

Refer toFIG.8AandFIG.8B, a multi-layer panel of an embodiment of the present invention is provided. As shown in the figures, this embodiment is based on the first embodiment mentioned above. In this embodiment, the display further includes a third display area A3at which at least one third pixel40is arranged. The third pixel40is composed of a plurality of third subpixels42and receiving a third control signal. A P-type electrode layer P and a N-type electrode layer N are disposed on the panel10. The P-type electrode layer P is electrically connected with the first sub-pixel22, the second sub-pixels32, and the third sub-pixels42while the N-type electrode layer N is disposed on an outer edge of the panel10and electrically connected with the first sub-pixel22, the second sub-pixels32, and the third sub-pixels42. In this embodiment, the micro LED display1includes a plurality layers of the panels10,10′ and the N-type electrode layer N of the panel10is electrically connected with another N-type electrode layer N of another panel10′ at a positioning point11. That means the N-type electrode layer N at the positioning point11of the panel10is electrically connected with the N-type electrode layer N at another positioning point11′ of the panel10′ so that the panel10and the panel10′ are stacked to form the display panel with vertically stacked light emitting devices. The rest components of this embodiment are the same as those of the first embodiment mentioned above and are not described in details.

In this embodiment, the N-type electrode layer N of the panel10is electrically connected with the N-type electrode layer N of the panel10′ by fan-out packaging.

In this embodiment, the positioning point11of the panel10is arranged at the outer edge of the panel10, but not limited.

In this embodiment, an area of the positioning point11of the panel10is larger than an area of the positioning point11′ of the panel10′. That means the positioning point11′ is also disposed on an outer edge of the panel10′ under the panel10and the area of the positioning point11′ of the panel10′ should be smaller than the area of the positioning point11of the panel10. After the two panels10,10′ being stacked, the positioning points11,11′ located at upper side and lower side are easier to be found and the N-type electrode layers N can be electrically connected by wires. Thereby a problem of difficulty in positioning can be solved.

In a preferred embodiment, the number of the layers of the stacked panels10,10′ is not limited to two. The layers stacked can be three layers or multiple layers.

In summary, in the micro LED display according to the present invention, the number of control units in a part of area of the panel (the second display area) is reduced or resolution of a part of area of the panel is controlled by location-selection signal for reduction of the resolution while that part of area is corresponding to an area where the eyes sees things without focusing (such as peripheral vision). The power consumption of the display is further reduced and so is the manufacturing cost of the display. Moreover, fewer control units or wires are used at the panel of the display so that yield rate of the display is improved and response time of images is reduced. The micro LED display the above structure can solve the problems of the conventional near-eye displays including greater energy consumption and higher manufacturing cost.

Additional advantages and modifications will readily occur to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the specific details, and representative devices shown and described herein. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalent.