Uniform light-emitting keyboard backlight module

Abstract

The utility model relates to the field of keyboard backlight modules, in particular to a uniform light-emitting keyboard backlight module. The keyboard backlight module comprises a circuit board, a light-emitting chip, a packaging layer, a light guide piece and a shading piece, the light guide piece is fixed between the circuit board and the shading piece, the light-emitting chip is connected to the circuit board and wrapped in the packaging layer, a lamp groove is formed in the light guide piece, the light-emitting chip is arranged in the lamp groove, and the edges of the circuit board and the shading piece are fixedly connected together; a P-type semiconductor electrode and an N-type semiconductor electrode are arranged on the light-emitting chip, a bonding pad is arranged on the circuit board, and the electrode face of the light-emitting chip faces the circuit board below. According to the utility model, the N-type semiconductor and the P-type semiconductor of the light-emitting chip are directly welded on the bonding pad of the circuit board, and the light-emitting chip is fully wrapped by the packaging layer to realize packaging. Therefore, the structure is simplified, and the manufacturing cost is reduced. The anti-dazzling screen prevents halo or stray light from being generated in the area, which does not need to emit light, of the keyboard.

Description

Technical Field

[0001] This utility model relates to the field of keyboard backlight modules, and in particular to a uniformly illuminated keyboard backlight module. Background Technology

[0002] With the continuous development of electronic products, users have increasingly higher requirements for the appearance and functionality of keyboards. Keyboard backlighting, as an important function to enhance the keyboard user experience, can help users identify key characters in low-light environments and enhance the visual effect of the keyboard.

[0003] Traditional keyboard backlight modules use LEDs as the light source. One or more LEDs are soldered onto an FPC (Flexible Printed Circuit) beneath each keycap, requiring approximately 100 to 120 LEDs in total. This method involves pre-soldering the LED chips onto a metal bracket, followed by processes such as baking, wire bonding, baking, sealing, baking, stripping, testing, and packaging to manufacture the LEDs. This structure has high production costs, and the large size of the LEDs limits the design of thinner and lighter keyboard backlight modules as well as the uniformity of light emission.

[0004] Another approach to traditional keyboard backlight modules requires the pre-fabrication of LEDs, followed by welding several LEDs onto a light strip for side-entry light. The light is then diffused to the corresponding areas of the keyboard keycaps via a light guide sheet. However, the light diffusion is insufficient in areas far from the light strip, especially at the edges of the module where dark areas tend to form. Conversely, areas closer to the light strip may experience overexposure, making it difficult to adjust the lighting effect to achieve uniform keyboard illumination. Furthermore, the light color is limited and cannot achieve dynamic dimming in different zones. Utility Model Content

[0005] The technical problem this invention aims to solve is: to address the technical problems described in the background art, this invention provides a uniformly illuminated keyboard backlight module. This is achieved by directly soldering the N-type and P-type semiconductors of the light-emitting chip onto the pads of the circuit board, and then fully encapsulating the light-emitting chip with an encapsulation layer. This simplifies the structure and reduces manufacturing costs. A light-shielding sheet prevents halos or stray light from being generated in areas of the keyboard where illumination is not required.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] A uniform light-emitting keyboard backlight module includes a circuit board, a light-emitting chip, an encapsulation layer, a light guide sheet, and a light shield. The light guide sheet is fixed between the circuit board and the light shield. The light-emitting chip is connected to the circuit board and is encapsulated in the encapsulation layer. The light guide sheet has a lamp groove, and the light-emitting chip is placed in the lamp groove. The edges of the circuit board and the light shield are fixedly connected together.

[0008] The light-emitting chip is provided with P-type semiconductor electrodes and N-type semiconductor electrodes, and the circuit board is provided with pads. The electrode surface of the light-emitting chip faces the circuit board below, and the P-type semiconductor electrodes and N-type semiconductor electrodes are respectively soldered to the pads.

[0009] Specifically, the encapsulation layer is a fully transparent or semi-transparent material.

[0010] Specifically, the light guide sheet is located below the keycap area of ​​the keyboard, and the surface of the light guide sheet is provided with textures or dots.

[0011] Specifically, the surface of the light-shielding sheet is printed with a layer of black ink.

[0012] Specifically, the edges of the circuit board and the light-shielding sheet are glued together.

[0013] The beneficial effects of this invention are as follows: This invention provides a uniformly illuminated keyboard backlight module. The N-type and P-type semiconductors of the light-emitting chip are directly soldered to the pads on the circuit board, and the chip is fully encapsulated with an encapsulation layer. This simplifies the structure and reduces manufacturing costs. A light-shielding sheet prevents halos or stray light from appearing in areas of the keyboard where illumination is not required. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] In the diagram: 1. Circuit board, 2. Light-emitting chip, 3. Encapsulation layer, 4. Light guide plate, 5. Light shield, 11. Solder pad.

[0017] 21. P-type semiconductor electrode, 22. N-type semiconductor electrode, 41. Lamp trough. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0019] Figure 1 This is a schematic diagram of the structure of this utility model.

[0020] As attached Figure 1As shown, a uniformly illuminated keyboard backlight module includes a circuit board 1, a light-emitting chip 2, an encapsulation layer 3, a light guide sheet 4, and a light shield 5. The light guide sheet 4 is fixed between the circuit board 1 and the light shield 5. The light-emitting chip 2 is connected to the circuit board 1 and is encapsulated within the encapsulation layer 3. The light guide sheet 4 has lamp grooves 41, and the light-emitting chip 2 is placed within the lamp grooves 41. The edges of the circuit board 1 and the light shield 5 are fixedly connected together. Several lamp grooves 41 correspond one-to-one with several light-emitting chips 2. This module achieves zoned dynamic dimming.

[0021] The light-emitting chip 2 is provided with a P-type semiconductor electrode 21 and an N-type semiconductor electrode 22, and the circuit board 1 is provided with a pad 11. The electrode surface of the light-emitting chip 2 faces the circuit board 1 below, and the P-type semiconductor electrode 21 and the N-type semiconductor electrode 22 are respectively soldered to the pad 11.

[0022] The pad 11 is soldered with die bond solder to the P-type semiconductor electrode 21 and N-type semiconductor electrode 22 of the corresponding light-emitting chip 2. When a positive voltage is continuously applied, electrons from the N-type semiconductor electrode 22 flow to the P-type semiconductor electrode 21 and recombine with holes in the P-type semiconductor electrode 21. During recombination, electrons jump from a higher energy state to a lower energy state, and the excess energy is released in the form of photons, thereby realizing the light emission of the light-emitting chip 2.

[0023] The encapsulation layer 3 is made of a fully transparent or semi-transparent material.

[0024] The light guide 4 is located below the keycap area of ​​the keyboard, and the surface of the light guide 4 is decorated with textures or dots.

[0025] The surface of the light-shielding sheet 5 is printed with a layer of black ink. The light-shielding sheet 5 can achieve local light blocking, prevent light leakage, and avoid the generation of halos or stray light in areas of the keyboard where light is not needed, thereby improving the contrast and display effect of the keyboard backlight.

[0026] The edges of circuit board 1 and light shield 5 are bonded together with adhesive. Direct bonding of circuit board 1 and light shield 5 simplifies the process and saves costs.

[0027] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A backlight module for a uniform light emitting keyboard, characterized in that, The application relates to a light-emitting chip package, which comprises a circuit board (1), a light-emitting chip (2), a packaging layer (3), a light guide sheet (4) and a light shielding sheet (5), the light guide sheet (4) is fixed between the circuit board (1) and the light shielding sheet (5), the light-emitting chip (2) is connected to the circuit board (1), the light-emitting chip (2) is wrapped in the packaging layer (3), the light guide sheet (4) is provided with a lamp groove (41), the light-emitting chip (2) is arranged in the lamp groove (41), and the edges of the circuit board (1) and the light shielding sheet (5) are fixedly connected together. The light-emitting chip (2) is provided with a P-type semiconductor electrode (21) and an N-type semiconductor electrode (22), the circuit board (1) is provided with a solder pad (11), the electrode surface of the light-emitting chip (2) faces the circuit board (1) downwards, and the P-type semiconductor electrode (21) and the N-type semiconductor electrode (22) are respectively soldered to the solder pad (11).

2. The uniform light emitting keyboard backlight module of claim 1, wherein: The packaging layer (3) is made of full-transparent or semi-transparent material.

3. The uniform light emitting keyboard backlight module of claim 1, wherein: The light guide sheet (4) is located below the key cap area of a keyboard, and the surface of the light guide sheet (4) is provided with lines or dots.

4. The uniform light emitting keyboard backlight module of claim 1, wherein: The surface of the light shielding sheet (5) is printed with a black ink layer.

5. The uniform light emitting keyboard backlight module of claim 1, wherein: The edges of the circuit board (1) and the light shielding sheet (5) are connected together through gluing.

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