Mini-LED display module and its chip electrode alignment tolerance design method

Abstract

The present invention discloses a Mini-LED display module and a method for designing the alignment tolerance of its core electrode. The Mini-LED display module comprises a plurality of LED cores arranged in an array, wherein each electrode of each LED core is in electrical contact with a corresponding conductive circuit; the maximum dimension L of each electrode along the line width direction of the corresponding conductive circuit is greater than (W+Δ×2), wherein W is the line width of the corresponding conductive circuit, and Δ is the alignment tolerance between each electrode and the corresponding conductive circuit. The Mini-LED display module prepared by the method of the present invention has good reliability, high integration, and high resolution.

Description

Technical Field

[0001] The present invention belongs to the field of semiconductor lighting technology, and specifically relates to a Mini-LED display module and a method for designing the alignment tolerance of a core electrode thereof. Background Art

[0002] Mini-LED technology based on semiconductor technology is a new type of high-brightness and high-resolution display technology. Mini-LED is between 50 and 200μm in size. It can be used as both an array pixel display and a backlight source for LCDs. It has broad market prospects in the fields of televisions, displays, notebooks, etc. Compared with LCD and OLED displays, Mini-LED has many advantages, such as high brightness, low power, long life, and good thermal stability. However, Mini-LED is much smaller than traditional LED devices and has a relatively high density, which brings many technical and physical challenges, such as mass transfer technology and full-color display.

[0003] In actual engineering applications, when a massive number of Mini-LED chips are transferred, the chips are not completely evenly arranged on the blue film or UV film. The chips are offset and twisted up and down, left and right, and the massive chips may also be slightly offset during the transfer to the substrate. The misalignment of the metal connecting wires and the metal electrodes of the offset chips will cause short circuits and open circuits in the row / column electrical connections of the Mini-LED display module, which will lead to abnormal Mini-LED display. Summary of the invention

[0004] The main purpose of the present invention is to provide a Mini-LED display module and a method for designing the alignment tolerance of the core electrode thereof to overcome the deficiencies of the prior art.

[0005] In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention includes:

[0006] An embodiment of the present invention provides a Mini-LED display module, which includes a plurality of LED core particles arranged in an array, wherein each electrode of each LED core particle is in electrical contact with a corresponding conductive circuit; and is characterized in that: a maximum dimension L of each electrode along a line width direction of the corresponding conductive circuit is greater than (W+Δ×2), wherein W is the line width of the corresponding conductive circuit, and Δ is the allowable alignment error between each electrode and the corresponding conductive circuit.

[0007] The embodiment of the present invention further provides a method for designing a Mini-LED chip electrode alignment tolerance, which includes:

[0008] Setting an alignment tolerance Δ between each electrode of each LED chip and the corresponding conductive circuit in the Mini-LED display module;

[0009] The maximum dimension L of each electrode along the line width direction of the corresponding conductive line is set to be greater than (W+Δ×2), where W is the line width of the corresponding conductive line, so that the electrode maintains electrical contact with the corresponding conductive line when there is an alignment error between any electrode and the corresponding conductive line.

[0010] Compared with the prior art, the beneficial effects of the present invention are at least:

[0011] (1) The LED chip electrode alignment tolerance design proposed in the present invention can still ensure the alignment and connection between the chip electrode and the corresponding conductive circuit when the chip is offset, and has high reliability.

[0012] (2) The red, green and blue long strip LED core particles designed using the method of the present invention can be combined as a light-emitting unit and applied to high-density Mini-LED displays.

[0013] (3) The electrodes at both ends of the long strip LED core particles in the present invention can be connected by metal wires, which can reduce the parasitic resistance of the rows / columns of the Mini-LED display module. Under the same voltage conditions, the rows / columns of the Mini-LED display module can connect more LED core particles in series, and the integration is high.

[0014] (4) The square LED core particles in the present invention can have an insulating area that can be overlapped and utilized, and the core particle size can be designed to be smaller. A Mini-LED display module of the same size can integrate more LED core particles, thereby improving the resolution of the Mini-LED display module. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 This is a schematic diagram of the LED core structure of a Mini-LED display module in Example 1 of the present invention;

[0017] Figure 2 is a schematic diagram of the LED core particle in Example 1 of the present invention when it is offset;

[0018] Figure 3 This is a schematic diagram of the LED core structure of a Mini-LED display module in Example 2 of the present invention;

[0019] Figure 4It is a schematic diagram of the LED core particle in Example 2 of the present invention when it is offset.

[0020] Explanation of reference numerals: 1-P-type electrode, 2-N-type electrode, 3-first conductive line, 4-second conductive line, 5-insulating layer. DETAILED DESCRIPTION

[0021] In view of the defects of the prior art, the inventor of this case has proposed the technical solution of the present invention after long-term research and extensive practice. The technical solution, its implementation process and principle will be further explained as follows.

[0022] An embodiment of the present invention provides a Mini-LED display module, comprising a plurality of LED core particles arranged in an array, wherein each electrode of each LED core particle is in electrical contact with a corresponding conductive circuit; the maximum dimension L of each electrode along the line width direction of the corresponding conductive circuit is greater than (W+Δ×2), wherein W is the line width of the corresponding conductive circuit, and Δ is the allowable alignment error between each electrode and the corresponding conductive circuit.

[0023] Furthermore, the conductive circuit includes:

[0024] The first conductive circuit is electrically connected to the first electrode of the LED core particle.

[0025] The second conductive circuit is electrically connected to the second electrode of the LED core particle.

[0026] Furthermore, the first conductive circuit is electrically connected to at least two first electrodes, and the second conductive circuit is electrically connected to a corresponding second electrode.

[0027] Furthermore, a plurality of the LED core particles are arranged in series and / or in parallel.

[0028] In one embodiment, the first electrode may be a P-type electrode, and the second electrode may be an N-type electrode.

[0029] In another embodiment, the first electrode may be an N-type electrode, and the second electrode may be a P-type electrode.

[0030] The first conductive circuit and the second conductive circuit may be made of metal wires.

[0031] In one embodiment, the LED core particle is in the shape of an elongated strip, and the first electrode and the second electrode of the LED core particle extend along the width direction and the length direction of the LED core particle respectively;

[0032] The maximum dimension L of the first electrode along the width direction of the LED core particle is 11 >(W1+Δ×2), the maximum dimension L along the length direction of the LED core particle12 >(Δ×2), W1 is the line width of the first conductive circuit electrically connected to the first electrode, and the line width direction of the first conductive circuit is consistent with the width direction of the LED core particle;

[0033] The maximum dimension L of the second electrode along the length direction of the LED core particle 21 >(W2+Δ×2), the maximum dimension L along the width direction of the LED core particle 22 >(Δ×2), W2 is the line width of the second conductive circuit electrically connected to the second electrode, and the line width direction of the second conductive circuit is consistent with the length direction of the LED core particle.

[0034] Furthermore, the length L of the LED core particle c1 >(W2+Δ×4), width L c2 >(W1+Δ×2).

[0035] Among them, W1=W2.

[0036] In some cases, W1 and W2 may not be equal.

[0037] In another embodiment, the LED core particle is square, the first electrode and the second electrode of the LED core particle are arranged along a first direction and a second direction respectively, the first direction and the second direction are parallel to a first side and a second side of the LED core particle respectively, and the first side intersects with the second side;

[0038] The maximum size L of the first electrode along the first direction 31 >(W1+Δ×2), the maximum dimension L along the second direction 32 >Δ, W1 is the line width of the first conductive circuit electrically connected to the first electrode, and the line width direction of the first conductive circuit is the first direction;

[0039] The maximum dimension L of the second electrode along the second direction 41 >(W2+Δ×2), the maximum dimension L along the first direction 22 >Δ, W2 is the line width of the second conductive circuit electrically connected to the second electrode, and the line width direction of the second conductive circuit is the second direction.

[0040] Furthermore, the lengths of the first side and the second side of the LED core particle are both greater than (Δ×3).

[0041] Among them, W1=W2.

[0042] In some cases, W1 and W2 may not be equal.

[0043] It should be noted that the pattern of the above-mentioned electrode can be in various shapes, such as rectangle, triangle, wedge, etc., as long as it can meet the application requirements.

[0044] The embodiment of the present invention further provides a method for designing a Mini-LED chip electrode alignment tolerance, which includes:

[0045] Setting an alignment tolerance Δ between each electrode of each LED chip and the corresponding conductive circuit in the Mini-LED display module;

[0046] The maximum dimension L of each electrode along the line width direction of the corresponding conductive line is set to be greater than (W+Δ×2), where W is the line width of the corresponding conductive line, so that the electrode maintains electrical contact with the corresponding conductive line when there is an alignment error between any electrode and the corresponding conductive line.

[0047] The following will describe the technical solutions in the embodiments of the present invention in detail in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] Example 1

[0049] See also Figure 1 , is the LED core structure of the Mini-LED display module in this embodiment. The LED core is in the shape of an elongated strip, on which two P-type electrodes 1 are arranged, and an N-type electrode 2 is arranged between the two P-type electrodes 1. The P-type electrode 1 and the N-type electrode 2 extend along the width direction and the length direction of the LED core, respectively.

[0050] The P-type electrode 1 and the N-type electrode 2 are both square in shape. The P-type electrode 1 is electrically connected to the first conductive circuit 3 , and the N-type electrode 2 is electrically connected to the second conductive circuit 4 .

[0051] Among them, the maximum dimension L of the P-type electrode 1 along the width direction of the LED core particle is 11 >(W1+Δ×2), the maximum dimension L along the length of the LED core 12 >(Δ×2), the maximum dimension L of the N-type electrode 2 along the length direction of the LED core particle 21 >(W2+Δ×2), the maximum dimension L along the width of the LED core 22 >(Δ×2).

[0052] And the length L of the LED core c1 >(W2+Δ×4), width L c2 >(W1+Δ×2).

[0053] Wherein, Δ is the alignment tolerance between the P-type electrode 1 and the first conductive circuit 3 or the N-type electrode 2 and the second conductive circuit 4 , W1 is the line width of the first conductive circuit 3 , W2 is the line width of the second conductive circuit 4 , and W1=W2.

[0054] The LED chip structure in this embodiment appears as follows Figure 2 When the electrodes are offset upward, downward, leftward or rightward as shown, it is still possible to ensure that each electrode is aligned and connected to the corresponding conductive circuit without short circuit or open circuit.

[0055] The red, green and blue LED chips using this redundant design can be combined as a light-emitting unit for high-density Mini-LED displays. In addition, the electrodes at both ends of this long strip of LED chips can be connected by metal wires in the process to reduce the parasitic resistance of the rows / columns of the Mini-LED display module. Under the same voltage conditions, the Mini-LED display module using this solution can have more LED chips connected in series in its rows / columns.

[0056] Example 2

[0057] See also Figure 3 , is the LED core structure of the Mini-LED display module in this embodiment. The LED core is square and is provided with a pair of P-type electrodes 1 and a pair of N-type electrodes 2. The P-type electrodes 1 and the N-type electrodes 2 are respectively arranged along the four sides of the LED core, and the electrodes are electrically isolated by an insulating layer 5.

[0058] The P-type electrode 1 and the N-type electrode 2 are both in the shape of a regular trapezoid. The P-type electrode 1 is electrically connected to the first conductive circuit 3 , and the N-type electrode 2 is electrically connected to the second conductive circuit 4 .

[0059] Among them, the maximum dimension L of the P-type electrode 1 along the lateral length direction of the LED core particle is 31 >(W1+Δ×2), the maximum dimension L along the adjacent side length of the LED core 32 >Δ, the maximum dimension L of the N-type electrode 2 along the longitudinal length of the LED core particle 41 >(W2+Δ×2), the maximum dimension L along the lateral length of the LED core particle 32 >Δ.

[0060] And the side length of the LED core particle is greater than (Δ×3).

[0061] Wherein, W1 is the line width of the first conductive line 3 , W2 is the line width of the second conductive line 4 , and W1=W2.

[0062] The LED chip structure in this embodiment appears as follows Figure 4When the electrodes are offset upward, downward, leftward or rightward as shown, it is still possible to ensure that each electrode is aligned and connected to the corresponding conductive circuit without short circuit or open circuit.

[0063] In this embodiment, the LED core particles are covered by the insulating layer 5 except for the electrodes. When the LED core particles are offset, the trapezoidal electrode design allows the corresponding conductive lines electrically connected to the electrodes to be placed on the insulating layer 5, which can effectively avoid short circuits in row / column connections. In addition, compared with the electrode alignment tolerance design scheme of the long strip LED core particles in Example 1, the insulating areas in this embodiment can be overlapped and utilized, and the size of the LED core particles can be designed to be smaller. Therefore, the Mini-LED display module of the same size can integrate more LED core particles, thereby improving the resolution of the Mini-LED display module.

[0064] It should be understood that the technical solution of the present invention is not limited to the above-mentioned specific implementation cases. Any technical deformation made according to the technical solution of the present invention without departing from the scope of protection of the purpose of the present invention and the claims shall fall within the protection scope of the present invention.

Claims

1. A Mini-LED display module, comprising a plurality of LED chips arranged in an array, wherein a first electrode of each LED chip is electrically connected to a first conductive circuit, and a second electrode is electrically connected to a second conductive circuit; characterized in that: The line width direction of the first conductive circuit is consistent with the width direction of the corresponding LED core particle, the line width direction of the second conductive circuit is consistent with the length direction of the corresponding LED core particle, and the first electrode and the second electrode of the LED core particle extend along the width direction and the length direction of the LED core particle respectively; When the LED core is in the shape of a long strip, the maximum dimension L of the first electrode along the width direction of the LED core is 11 >(W1+Δ×2), the maximum dimension L along the length of the LED core 12 >(Δ×2), the maximum dimension L of the second electrode along the length direction of the LED core particle 21 >(W2+Δ×2), the maximum dimension L along the width of the LED core 22 >(Δ×2); When the LED core is a square, the first electrode and the second electrode of the LED core are arranged along a first direction and a second direction respectively, the first direction and the second direction are parallel to a first side and a second side of the LED core respectively, and the first side intersects with the second side, and the maximum size L of the first electrode along the first direction is 31 >(W1+Δ×2), the maximum dimension L along the second direction 32 >Δ, the maximum dimension L of the second electrode along the second direction 41 >(W2+Δ×2), the maximum dimension L along the first direction 22 >Δ, the line width directions of the first conductive circuit and the second conductive circuit are respectively in the first direction and the second direction; Wherein, W1 and W2 are the line widths of the first conductive circuit and the second conductive circuit respectively, and Δ is the alignment tolerance between each electrode and the corresponding conductive circuit.

2. The Mini-LED display module according to claim 1, characterized in that: The first conductive circuit is electrically connected to at least two first electrodes.

3. The Mini-LED display module according to claim 1, characterized in that: The second conductive circuit is electrically connected to a corresponding second electrode.

4. The Mini-LED display module according to claim 1, characterized in that: A plurality of the LED core particles are arranged in series and / or in parallel.

5. The Mini-LED display module according to claim 1, characterized in that: When the LED core particle is in the shape of a long strip, the length L of the LED core particle is c1 >(W2+Δ×4), width L c2 >(W1+Δ×2).

6. The Mini-LED display module according to claim 1, characterized in that: When the LED core particle is a square, the lengths of the first side and the second side of the LED core particle are both greater than (Δ×3).

7. The Mini-LED display module according to any one of claims 1, 5 and 6, characterized in that: W1=W2.

8. A method for designing the alignment tolerance of a Mini-LED chip electrode according to any one of claims 1 to 7, characterized in that: include: Setting an alignment tolerance Δ between each electrode of each LED chip and the corresponding conductive circuit in the Mini-LED display module; The maximum dimension L of each electrode along the line width direction of the corresponding conductive line is set to be greater than (W+Δ×2), where W is the line width of the corresponding conductive line, so that the electrode maintains electrical contact with the corresponding conductive line when there is an alignment error between any electrode and the corresponding conductive line.

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