Patent ID: 12211884

DETAILED DESCRIPTION OF THE EMBODIMENTS

The present invention provides a micro-LED display device. With embodiments and drawings thereof, the features of the present invention are described in detail as follows.

With reference toFIGS.1and2A, a first embodiment of a micro-LED display device of the present invention is shown, and the micro-LED display device has a plurality of pixel areas10and a driving circuit30. The driving circuit30is electrically connected to the pixel areas10to drive the pixel areas10.

The pixel areas10are arranged in a N*M matrix to constitute N rows of pixel areas11and M columns of pixel areas12. Each pixel area10has K sub-pixel areas20arranged adjacent to each other. Each sub-pixel area20has J micro-LEDs100a,100b,100cwith different colored lights for, so each sub-pixel area20may display different image colors. In the present embodiment, a pitch between two adjacent pixel areas10is less than 100 μm and a size of each micro-LED100a,100b,100cis less than 30 μm. With reference toFIG.2A, each pixel area10in the first embodiment of the present invention has four sub-pixel areas20(K=4). Each sub-pixel area20has three different colored-light micro-LED100a,100b,100c(J=3) and is electrically connected to a scan line311. The micro-LEDs with the same colored light of each pixel area10are commonly and electrically connected to one data line321. In particular, each sub-pixel area20at least has a red micro-LED100a, a green micro-LED100band bule micro-LED100c. In the present embodiment, the micro-LEDs100a,100b,100cof each pixel area10are also arranged in a K*J matrix. The micro-LEDs on the same row are electrically connected to the same scan line311and the micro-LEDs on the same column are electrically connected to the same data line321. Therefore, each pixel area10of the present embodiment has four scan lines311and three data lines321. With reference toFIG.7A, two electrodes of each micro-LED100a,100b,100care directly and electrically connected to the corresponding scan line311(VS) and data line321(VD). With reference toFIG.7B, one electrode of each micro-LED100a,100b,100cis electrically connected to the corresponding scan line311, the corresponding data line321and a first voltage terminal (high voltage terminal VDD) of a system power through a pixel driving circuit101. The other electrode of each micro-LED100a,100b,100cis electrically connected to a second voltage terminal (low voltage terminal VSS) of the system power. The pixel driving circuit101may be a 2T1C driver consisted of two transistors TD, TSand a storage capacitor CS, 3T1C driver, 6T2C driver or the like.

The driving circuit30has a scan module31and a data module32. With reference toFIG.2A, the scan module31is electrically connected to the K scan lines of each row of pixel areas11and the data module32is electrically connected to the at least three data lines321of each column of pixel areas12. The driving circuit30has a first driving mode and a second driving mode.

In the first driving mode, with further reference toFIG.2B, the driving circuit30sequentially enables the N rows of pixel areas11in one frame period through the scan module31. When the driving circuit30enables one of the rows of pixel areas11, the scan module31selects one of the sub-pixel areas20of each pixel area10on the row of pixel areas11and outputs a scanning signal S11˜Sn1to the selected sub-pixel area20to enable the sub-pixel area20. In addition, more than one but less than K sub-pixel areas20may be selected to be enabled. The data module32outputs an image data signal to each of the enabled sub-pixel areas20and the each of the enable sub-pixel areas20displays an image color corresponding the image data signal. In the present embodiment, since each pixel area10has the K sub-pixel areas20, the driving circuit30sequentially outputs N scanning signals in one frame period if the driving circuit30selects only one of the rows of pixel areas11to enable. At the time, the driving circuit30outputs the M*N image data signals to the enabled sub-pixel areas20through the data module32.

Furthermore, the present embodiment of the micro-LED display device may further increase a resolution of an image displayed in the first driving mode. That is, the N*M pixels areas10of the micro-LED display device is increased to (N*K)*M sub-pixel areas20and a more detailed image is displayed. For example, to increase the resolution of the displayed image, in one frame period, the N rows of pixel areas11are sequentially enabled. That is, the scan module31sequentially outputs the scanning signals to the four scan lines311(K=4), and the four sub-pixel areas20in the pixel area10are enabled in sequence. Therefore, in one frame period, the driving circuit30sequentially outputs the N*K scanning signals. After then, the driving circuit30outputs M*N*K image data signals to the enabled sub-pixel areas20through the data module32to display an image with (N*K)*M image pixels.

In the second mode, with further reference toFIG.2C, the driving circuit30sequentially enables the N rows of pixel areas11through the scan module31. When the driving circuit30enables one of the rows of pixel areas11, the scan module31synchronously outputs the four scanning signals S1˜S4to the K scan lines311of the K sub-pixel areas20of each pixel area10on the row of pixel areas11. After then, the same image data signal is synchronously outputted to the enabled sub-pixel areas20in the same pixel area10to display the same image colors. That is, the K sub-pixel areas20of each pixel area10receive the same image data signals. In the second driving mode, a brightness of each pixel area10is increased by K times without increasing the driving current load.

In the first and second driving modes, the image data signal outputted from the data module32has at least three (j=3) constant-current signals or three variable current signals in one sub-pixel area20. When the enabled sub-pixel area20receives the image data signal, the at least three micro-LED100a,100b,100cwith different colored lights respectively emits the preset grayscale colors and the three grayscale colors are mixed to the image color corresponding the image data signal.

With reference toFIGS.3and2A, the second embodiment of a micro-LED display device of the present invention is shown and is similar to the first embodiment ofFIG.1. In the present embodiment, the micro-LED display device has a plurality of pixel areas10and a driving circuit30. The driving circuit30has a scan module31and a data module32. The scan module31further has K scan units310. The K scan units310are respectively and electrically connected to the K scan lines311of each pixel area10of each row of pixel areas11. For example, the first scan unit310is electrically connected to the first scan lines311of the pixel areas10, the second scan unit310is electrically connected to the second scan lines311of the pixel areas10, and the Kth scan unit310is electrically connected to the Kth scan lines311of the pixel areas10. In the present embodiment, the K scan units310may synchronously operate. In a second driving mode of the driving circuit30, when the K scan units310synchronously operate according to a common clock signal, the K scanning signals are synchronously outputted to the K scan lines311of the K sub-pixel areas20of each pixel area10to increase the brightness by K times. In the first driving mode, the K scan units310output the K scanning signals in different times to increase a resolution of an image displayed by the micro-LED display device of the present invention.

With reference toFIG.4A, a second embodiment of each pixel area10of the present invention. The pixel area10has K sub-pixel areas20and each sub-pixel area20has J micro-LEDs100a,100b,100cwith different colored lights. Compared with the pixel area10ofFIG.2A, in the present embodiment, all the pixel areas10on the same row of pixel areas11are commonly and electrically connected to one scan line311and all pixel areas10on the same column of pixel areas12are electrically connected to J*K data lines321. That is, all the micro-LEDs100a,100b,100cof each pixel area10are commonly and electrically connected to one scan line311, but respectively and electrically connected to K*J data lines321. Particularly, the micro-LEDs100a,100b,100cof each sub-pixel area12may be red, green and blue light-emitting elements. Therefore, each row of pixel areas11of the present embodiment has one scan line311and each column of pixel areas12has twelve data lines321.

In the first driving mode of the present embodiment, with further reference toFIG.4B, the scan module31outputs the N scanning signals S1, S2, S3. . . Sn in sequence to the N scan lines311of the N rows of pixel areas11. When the driving circuit30enables one of the N rows of pixel areas11, the scan module31outputs the scanning signal to the corresponding scan line311thereof to enable the K sub-pixel areas20of each pixel area10on the row of pixel areas11. At the time, the data module322selects the J data lines (J=3 in the present embodiment) of at least one sub-pixel area20and outputs an image data signal to the selected J data lines. When the at least one sub-pixel area20of the enabled pixel area10receives the image data signal, the sub-pixel area29displays an image color corresponding to the image data signal. Therefore, the image with N*M image pixels is displayed in one frame period. To further increase a resolution of the displayed image, the micro-LED display device may have (N*K)*M sub-pixel areas20. During the pixel area10is enabled, the data module32respectively outputs the K image data signals to the K sub-pixel areas20of the enabled pixel area10, and the K sub-pixel areas respectively display different image colors.

In the second driving mode of the present embodiment, when the driving circuit30enables one of the rows of pixel areas11, with reference toFIG.4B, the scanning signal S1, S2, S3. . . or Sn is outputted to the single scan line311of the row of pixel areas11to enable the K sub-pixel areas20of each pixel areas10on the row of pixel areas11. The data module32respectively outputs the same K image data signals to the K enabled sub-pixel areas20, so the K enabled sub-pixel areas20display the same image colors corresponding to the received image data signals to increase a brightness of the micro-LED display device by K times. That is, the data lines D1,1to D1,4receive the same controlling signals from the data module32, the data lines D1,5to D1,8receive the controlling signals from the data module32, and the data lines D1,9to D1,12receive the controlling signals from the data module32. Therefore, each sub-pixel area20is used as one image pixel of the displayed image.

With reference toFIGS.2A and4A, in the first driving mode, the driving circuit30sequentially enables the N rows of pixel areas11. When one of the rows of pixel areas11is enabled, one sub-pixel area20of each pixel area10on the row of pixel areas11is driven to display the image color used as one image pixel. In the second driving mode, the driving circuit30sequentially enables the N rows of pixel areas11. When one of the rows of pixel areas11is enabled, the K sub-pixel areas20of each pixel area10on the row of pixel areas11are synchronously enabled and receive the same image data signals, so the K sub-pixel areas20of each pixel area10on the row of pixel areas11are synchronously driven to display the same image colors used as one image pixel. Therefore, in the second driving mode, the brightness of the micro-LED display device of the present invention is greatly increased to meet the high brightness of image requirement without increasing the conduction currents and the overall power consumption is not increased.

With reference toFIGS.5and6A, a third embodiment of a micro-LED display device of the present invention is shown. The micro-LED display device has a plurality of pixel groups40and a driving and driving circuit30. The driving circuit30is electrically connected to the pixel groups40to drive the pixel groups40.

The pixel groups40are arranged in a N*M matrix to constitute N rows of pixel groups41and M columns of pixel groups42. Each pixel group40has K pixel areas50arranged adjacent to each other. Each pixel area50has J micro-LEDs with different colored lights for displaying different image colors, wherein J=3. Therefore, the pixel groups40arranged in a N*M matrix also constitutes N*K rows of pixel areas50. In one embodiment, a pitch between two adjacent pixel areas50is less than 100 μm and a size of each micro-LED100a,100b,100cis less than 30 μm. With further reference toFIG.6A, in the present embodiment, each pixel group40has four pixel areas50(K=4). The K pixel areas50are respectively and electrically connected to K scan lines311. The micro-LEDs with the same colored light of each pixel group40are commonly and electrically connected to one data line321. In particular, each pixel area50at least has a red micro-LED100a, a green micro-LED100band blue micro-LED100c. Therefore, in the present embodiment, each row of pixel groups41has the four scan lines311and twelve data lines321of each column of pixel groups42.

The driving circuit30has a scan module31and a data module32. With further reference toFIG.6A, the scan module31is electrically connected to the K scan lines311of each row of pixel areas41, and the data module32is electrically connected to twelve scan lines321of each column of pixel groups42. The driving circuit30has a first driving mode and a second driving mode.

In the first driving mode, with further reference toFIG.6B, the driving circuit30sequentially outputs N*K scanning signals S11to Sn4to the N*K rows of pixel areas50in one frame period through the scan module31to sequentially enable the N*K rows of pixel areas50. The data module32outputs an image data signal to each enabled pixel area50and the enable pixel area50displays an image color corresponding the image data signal.

In the second mode, during one frame period, the driving circuit30sequentially enables the N rows of pixel groups41. When one of the rows of pixel group41is enabled, with further reference toFIG.6C, the K scan signal S11to S14are synchronously outputted to the K pixel areas50, and the image data signal is outputted to the enabled K pixel areas50. Therefore, the K pixel areas50of each enabled pixel group40receive the same image data signal to display the same image colors. Compared with the image displayed in the first driving mode, the resolution of the displayed image in the second driving mode decreases, but a brightness is relatively increased and meets the high-brightness requirement. In addition, the frame period of the second driving mode is shorter than that of the first driving mode, since the K scanning signals are synchronously outputted to the K pixel area50in the second driving mode, but the K scanning signals are respectively outputted to the K pixel area50at different times in the first driving mode. Therefore, a frame rate of the second driving mode is increased. In the present embodiment, the resolution of the image displayed in the first driving mode is higher than that of the second driving mode, but the brightness of displaying the image in the first driving mode is lower than that of the second driving mode.

In the first and second driving modes, the image data signal outputted from the data module32has at least three (j=3) constant-current signals or three variable current signals in one pixel area50. When the enabled pixel area50receives the image data signal, the at least three micro-LED100a,100b,100cwith different colored lights respectively emits the preset grayscale colors and the three grayscale colors are mixed to the image color corresponding the image data signal.

Based on the foregoing description, in the first and second embodiments of the present invention, each pixel area has K parallel sub-pixel areas. To increase the brightness of displaying image, the K sub-pixel areas are driven to display the same image colors in the second driving mode. In the third embodiment of the present invention, the adjacent pixel areas are divided to a pixel group. In the second driving mode, all pixel areas of each pixel group are driven to display the same image colors. Compared with the first driving mode, the pixel areas are driven to display different image colors, so the brightness of displaying the image in the second driving mode is greatly increased to meet the high-brightness requirement.

Even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and features of the invention, the disclosure is illustrative only. Changes may be made in the details, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.