MICRO LED array structure

Abstract

A MICRO LED array structure (S) comprises a pixel array (1) and a MICRO LED chip driving circuit (2). The pixel array (1) comprises a plurality of display pixels (1-11) and a plurality of redundant pixels (1-21), the display pixels (1-11) form a display pixel array (1-1), the redundant pixels (1-21) are arranged on the outer side of the display pixel array (1-1), the MICRO LED chip driving circuit (2) comprises a plurality of display driving circuits (3) and a plurality of redundant pixel circuits (4), the display driving circuits (3) respectively correspond to the display pixels (1-11), and the redundant pixel circuits (4) are arranged on the outer side of the display pixel array (1-1). The redundant pixel circuits (4) respectively correspond to the redundant pixels (1-21), and the redundant pixel circuits (4) are open circuits; therefore, the edge damage of the display pixel array (1-1) in the etching process can be reduced, and the purpose of improving the yield is achieved.

Description

MICRO LED array structure Technical Field

[0001] The present invention relates to the field of MICRO LED display technology, and more particularly to a MICRO LED array structure for improving process yield. Background Art

[0002] MICRO LED display technology uses self-luminous micron-sized LEDs as pixel units, assembled onto a driver panel to form a high-density LED array. Due to the small size, high integration, and self-luminescence of MICRO LED chips, MICRO LEDs offer significant advantages over LCDs and OLEDs in terms of brightness, resolution, energy consumption, lifespan, response speed, and thermal stability.

[0003] In existing micro LED arrays, each pixel in the array has a display function. When the micro LED array is in operation, driven by a driver circuit and an external chip, the micro LEDs perform their display function to display images or videos.

[0004] However, current micro LED array production processes, particularly those involving gallium nitride (GaN) semiconductors, can cause edge damage to the LED pixel structures surrounding the micro LED array, reducing the yield of the final micro LED product. Addressing this issue directly through etching requires extremely high process parameters and equipment, significantly increasing costs. Therefore, effectively addressing this issue and improving the yield of the final micro LED product is a critical issue.

[0005] Summary of the Invention

[0006] In view of this, the object of the present invention is to provide a MICRO LED array structure, which has a simple structure, can overcome the defects of the prior art, maintain a better complete display, avoid the influence of edge damage, and effectively improve the yield.

[0007] To achieve the above objectives, the present invention discloses a MICRO LED array structure, which is characterized by comprising:

[0008] a pixel array comprising a plurality of display pixels and a plurality of redundant pixels, wherein the display pixels form a display pixel array, and the redundant pixels are disposed outside the display pixel array; and

[0009] A MICRO LED chip driving circuit includes a plurality of display driving circuits and a plurality of redundant pixel circuits, wherein the display driving circuits correspond to the display pixels respectively, and the redundant pixel circuits correspond to the redundant pixels respectively;

[0010] The redundant pixel circuits are open circuited.

[0011] The redundant pixels form a redundant pixel set, and the redundant pixel set is arranged in a closed structure.

[0012] The redundant pixel set is in a shape of one of a circle and a quadrilateral.

[0013] Among them, each display driving circuit includes a display pixel driving circuit and a display light-emitting diode. The display pixel driving circuit includes a memory, a modulator and a driving circuit. The memory is used to output a pixel grayscale signal. The modulator is used to receive the pixel grayscale signal and a timing control signal. The modulator generates a light-emitting signal according to the pixel grayscale signal and the timing control signal and transmits the light-emitting signal to the driving circuit. The driving circuit is used to connect to the display light-emitting diode and control the display light-emitting diode to emit light according to the light-emitting signal.

[0014] The driving circuit includes a current source and a switch tube, and the switch tube includes a source, a gate and a drain. The source is connected to the current source, the gate is connected to the modulator, and the drain is connected to the display light emitting diode.

[0015] Among them, each redundant pixel circuit includes a redundant pixel driving circuit and a redundant light-emitting diode, the redundant pixel driving circuit includes a driving circuit, the driving circuit includes a current source and a switch tube, and the switch tube includes a source, a gate and a drain, the source is connected to the current source, and there is an open circuit between the source and the current source.

[0016] The redundant light emitting diode is connected to the drain of the switch tube.

[0017] In summary, the MICRO LED array structure of the present invention utilizes a redundant pixel set as a fence. When the display pixel array undergoes a gallium nitride (GaN) etching process, if the pixel array edges are damaged, the redundant pixel set structure will be damaged. However, the redundant pixels are non-luminous and thus do not affect the operation of the display pixel array. Furthermore, the display pixel array can permanently maintain a complete rectangular or other shape during display, unaffected by edge damage, thereby improving the yield of the MICRO LED product. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] FIG1 shows a schematic diagram of a MICRO LED array structure according to a specific embodiment of the present invention.

[0019] FIG2 shows a circuit diagram of a display driving circuit according to the present invention.

[0020] FIG3 shows a circuit diagram of a redundant pixel circuit according to the present invention.

[0021] FIG. 4 shows a schematic diagram of a pixel array of a MICRO LED array structure according to another embodiment of the present invention. DETAILED DESCRIPTION

[0022] To make the advantages, spirit, and features of the present invention more easily and clearly understood, the following detailed description and discussion will be given using examples and with reference to the accompanying drawings. It should be noted that these examples are merely representative of the present invention, and the specific methods, devices, conditions, materials, etc. exemplified therein are not intended to limit the present invention or the corresponding embodiments.

[0023] The terms used in the various embodiments disclosed in the present invention are only used for the purpose of describing specific embodiments and are not intended to limit the various embodiments disclosed in the present invention. The singular form used in the specification also includes the plural form, unless the context clearly indicates otherwise. Unless otherwise specified, all terms used in this specification (including technical terms and scientific terms) have the same meanings as those generally understood by those skilled in the art in the field to which the various embodiments disclosed in the present invention belong. The above terms (such as those defined in generally used dictionaries) will be interpreted as having the same meanings as in the context of the same technical field, and will not be interpreted as having idealized meanings or overly formal meanings unless such terms are clearly defined in the various embodiments disclosed in the present invention.

[0024] Please refer to Figure 1. Figure 1 shows a schematic structural diagram of a MICRO LED array structure S according to a specific embodiment of the present invention. As shown in Figure 1, in this specific embodiment, the MICRO LED array structure S includes a pixel array 1 and a MICRO LED chip driver circuit 2. The pixel array 1 includes a plurality of display pixels 1-11 and a plurality of redundant pixels 1-21, and the plurality of redundant pixels 1-21 are arranged outside the plurality of display pixels 1-11. The MICRO LED chip driver circuit 2 includes a plurality of display driver circuits 3 and a plurality of redundant pixel circuits 4. The plurality of display driver circuits 3 correspond to the plurality of display pixels 1-11, respectively, and the plurality of redundant pixel circuits 4 correspond to the plurality of redundant pixels 1-21, respectively. However, Figure 1 shows only one display driver circuit 3 and redundant pixel circuit 4. In practice, each display driver circuit 3 can control a different display pixel 1-11, and each redundant pixel circuit 4 can control a different redundant pixel 1-21. In other words, the display pixels 1-11 and the redundant pixels 1-21 are all independently displayed.

[0025] In this specific embodiment, a plurality of display pixels 1-11 form a display pixel array 1-1, and a plurality of redundant pixels 1-21 form a redundant pixel set 1-2. The redundant pixel set 1-2 is arranged in a closed structure, that is, the redundant pixel set 1-2 is disposed outside the display pixel array 1-1. As shown in FIG1 , the display pixel array 1-1 is rectangular, and the redundant pixel set 1-2 is in the shape of a rectangular frame, but this is not limited to this in practice. In actual applications, the display pixel array may also be circular, elliptical, quadrilateral, or polygonal, and the redundant pixel set may be in the shape of a circular, elliptical, quadrilateral, or polygonal pixel frame. The shape of the redundant pixel set may vary depending on the structural shape of the display pixel array. When the redundant pixel set 1-2 is disposed outside the display pixel array 1-1, the redundant pixel set 1-2 may be considered a fence for the display pixel array 1-1.

[0026] Please refer to Figures 1 and 2 together. Figure 2 shows a circuit diagram of the display driving circuit 3 of the present invention. As shown in Figures 1 and 2, in this specific embodiment, the display driving circuit 3 includes a display pixel driving circuit 3-1 and a display light-emitting diode 3-2. Furthermore, the display pixel driving circuit 3-1 includes a memory 3-11, a modulator 3-12, and a driving circuit 3-13. The memory 3-11 is connected to the modulator 3-12, the modulator 3-12 is connected to the driving circuit 3-13, and the driving circuit 3-13 is connected to the display light-emitting diode 3-2. In practice, the display driving circuit 3 can be integrated into a driver chip, and the memory 3-11 can be a memory and is used to store multiple pixel grayscale data of the display pixel 1-11 corresponding to the display driving circuit 3 at multiple time points. The modulator 3-12 can be a controller and can receive an external timing control signal (SFx) and a pixel grayscale signal transmitted by the memory 3-11, wherein the timing control signal is a signal used to control the brightness / grayscale of the display pixel 1-11. When the display driver circuit 3 is operating, the memory 3-11 outputs a pixel grayscale signal according to a timing sequence and transmits it to the modulator 3-12. The modulator 3-12 then generates a light-emitting signal based on the pixel grayscale signal and the timing control signal, and outputs the light-emitting signal to the driver circuit 3-13. Finally, the driver circuit 3-13 controls the display light-emitting diode 3-2 to emit light based on the light-emitting signal.

[0027] Furthermore, in this specific embodiment, the driving circuit 3-13 includes a current source 3-131 and a switch tube 3-132, and the switch tube 3-132 can be a field effect transistor (PMOS). The switch tube 3-132 includes a source, a gate, and a drain. The source of the switch tube 3-132 is connected to the current source 3-131, the gate of the switch tube 3-132 is connected to the modulator 3-12, the drain of the switch tube 3-132 is connected to the positive electrode of the display light-emitting diode 3-2, and the negative electrode of the display light-emitting diode 3-2 is grounded. In practice, after the modulator 3-12 outputs a light-emitting signal, the gate of the switch tube 3-132 can receive the light-emitting signal, and the switch tube 3-132 can drive the display light-emitting diode 3-2 to emit light according to the light-emitting signal.

[0028] Please refer to Figures 1 and 3 together. Figure 3 shows a circuit diagram of the redundant pixel circuit 4 of the present invention. As shown in Figures 1 and 2, in this specific embodiment, the redundant pixel circuit 4 includes a redundant pixel driving circuit 4-1 and a redundant light-emitting diode 4-2. Furthermore, the redundant pixel driving circuit 4-1 includes a memory 4-11, a modulator 4-12 and a driving circuit 4-13. The memory 4-11 is connected to the modulator 4-12, the modulator 4-12 is connected to the driving circuit 4-13, and the driving circuit 4-13 is connected to the redundant light-emitting diode 4-2. It is worth noting that the functions of the memory 4-11 and the modulator 4-12 in this specific embodiment are roughly the same as those of the memory and the modulator in the display driving circuit, and will not be repeated here.

[0029] Furthermore, the driving circuit 4-13 includes a current source 4-131 and a switch 4-132, and the switch 4-132 can be a field-effect transistor (PMOS). The switch 4-132 includes a source, a gate, and a drain. The gate of the switch 4-132 is connected to the modulator 4-12, the drain of the switch 4-132 is connected to the positive electrode of the redundant light-emitting diode 4-2, and the negative electrode of the redundant light-emitting diode 4-2 is grounded. The difference between the redundant pixel circuit 4 and the display driving circuit is that the circuit between the source of the switch 4-132 of the redundant pixel circuit 4 and the current source 4-131 is open. Therefore, when the switch 4-132 receives the light signal output by the modulator 4-12, the switch 4-132 will not control the redundant light-emitting diode 4-2 to emit light because the current / voltage of the current source 4-131 cannot pass through. In other words, the redundant light-emitting diode 4-2 will remain in an inoperative state. In this case, the redundant pixel 1-21 can also be called a dead pixel.

[0030] In this embodiment, the circuit structures of the display driver circuit 3 and the redundant pixel circuit 4 are identical, and the circuit structures of the display LED 3-2 and the redundant LED 4-2 are identical. The only difference between the display driver circuit 3 and the redundant pixel circuit 4 is that the driver circuit 3-13 of the display driver circuit 3 is turned on, while the driver circuit 4-13 of the redundant pixel circuit 4 is turned off. In other words, all LEDs corresponding to the pixel array 1 can be considered display LEDs, and the driver circuits in the outermost circle of the pixel array 1 are turned off to form redundant LEDs.

[0031] As shown in FIG1 , because each redundant pixel 1-21 in the redundant pixel set 1-2 is disconnected and does not emit light, the images and pictures presented by the MICRO LED array structure S of the present invention are generated by all the display pixels 1-11 of the display pixel array 1-1 in the pixel array 1. Furthermore, because the redundant pixel set 1-2 is disposed outside the display pixel array 1-1 and located at the edge of the pixel array 1, during the production process of the MICRO LED array structure S of the present invention, if a gallium nitride (GaN) etching process is performed on the pixel array 1 and damage occurs at the edge of the pixel array 1, only the redundant pixels 1-21 in the redundant pixel set 1-2 will be damaged, while the display pixels 1-11 of the display pixel array 1-1 will not be damaged. This maintains the integrity of the MICRO LED array structure S and the images / pictures, thereby improving the yield rate of the finished MICRO LED product.

[0032] In addition to the aforementioned forms, the MICRO LED array structure of the present invention may also be in other forms. Please refer to Figure 4. Figure 4 shows a schematic diagram of the pixel array 1' of the MICRO LED array structure S' according to another embodiment of the present invention. As shown in Figure 4, the difference between this embodiment and the aforementioned embodiment is that the redundant pixel set of the aforementioned embodiment is a single row of redundant pixels, the position of the redundant pixels in each row / column corresponds to the position of the display pixels, and the size of the redundant pixels is the same as the size of the display pixels. The redundant pixel set 1-2' of this embodiment is a double row of redundant pixels 1-21', the number of redundant pixels in each row / column is greater than the number of display pixels, and the size of the redundant pixels is smaller than the size of the display pixels. In practice, when the redundant pixel set 1-2' is a double row of redundant pixels 1-21', the redundant pixel set 1-2' can further protect the structure of the display pixel array 1-1' to maintain the integrity of the MICRO LED array structure S and the image / picture. In addition, after the MICRO LED array structure is produced, the redundant pixel set 1-2' can be covered and hidden by a cover plate 7 having the same shape as the redundant pixel set 1-2'. This not only does not affect the luminescence and image / video presentation of the pixel array 1-1', but also improves the aesthetics of the MICRO LED array structure.

[0033] In summary, the MICRO LED array structure of the present invention utilizes a redundant pixel set as a fence. When the display pixel array undergoes a gallium nitride (GaN) etching process, if the pixel array edges are damaged, the redundant pixel set structure will be damaged. However, the redundant pixels are non-luminous and thus do not affect the operation of the display pixel array. Furthermore, the display pixel array can permanently maintain a complete rectangular or other shape during display, unaffected by edge damage, thereby improving the yield of the MICRO LED product.

[0034] The above detailed description of the preferred embodiments is intended to more clearly describe the features and spirit of the present invention, but is not intended to limit the scope of the present invention by the preferred embodiments disclosed above. On the contrary, its purpose is to cover various changes and equivalent arrangements within the scope of the patent application to be applied for by the present invention. Although the present invention has been disclosed above in terms of implementation methods, it is not intended to limit the present invention. Anyone skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope of the appended patent application.

Claims

1. A MICRO LED array structure, characterized in that Include: a pixel array comprising a plurality of display pixels and a plurality of redundant pixels, wherein the display pixels form a display pixel array, and the redundant pixels are disposed outside the display pixel array; and A MICRO LED chip driving circuit includes a plurality of display driving circuits and a plurality of redundant pixel circuits, wherein the display driving circuits correspond to the display pixels respectively, and the redundant pixel circuits correspond to the redundant pixels respectively; The redundant pixel circuits are open circuited.

2. The MICRO LED array structure according to claim 1, wherein: The redundant pixels form a redundant pixel set, and the redundant pixel set is arranged in a closed structure.

3. The MICRO LED array structure according to claim 2, wherein: The shape of the redundant pixel set is one of a circle and a quadrilateral.

4. The MICRO LED array structure according to claim 1, wherein: Each display driving circuit includes a display pixel driving circuit and a display light-emitting diode. The display pixel driving circuit includes a memory, a modulator, and a driving circuit. The memory is used to output a pixel grayscale signal. The modulator is used to receive the pixel grayscale signal and a timing control signal. The modulator generates a light-emitting signal based on the pixel grayscale signal and the timing control signal and transmits the light-emitting signal to the driving circuit. The driving circuit is used to connect to the display light-emitting diode and control the display light-emitting diode to emit light based on the light-emitting signal.

5. The MICRO LED array structure according to claim 4, wherein: The driving circuit includes a current source and a switch tube, and the switch tube includes a source, a gate and a drain. The source is connected to the current source, the gate is connected to the modulator, and the drain is connected to the display light emitting diode.

6. The MICRO LED array structure according to claim 1, wherein: Each redundant pixel circuit includes a redundant pixel driving circuit and a redundant light-emitting diode. The redundant pixel driving circuit includes a driving circuit. The driving circuit includes a current source and a switch tube. The switch tube includes a source, a gate and a drain. The source is connected to the current source, and there is an open circuit between the source and the current source.

7. The MICRO LED array structure according to claim 6, wherein: The redundant light emitting diode is connected to the drain of the switch tube.

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