SMD LED, LED nixie tube, ultrathin display module and household appliance

Abstract

The utility model discloses a surface-mounted LED, an LED nixie tube, an ultrathin display module and a household appliance, and belongs to the technical field of display devices, and a bonding pad of the surface-mounted LED is arranged on a long edge side. The short sides of the SMD LEDs of the LED nixie tube are connected end to end and are tightly connected end to end to form an 8-shaped display structure which emits light uniformly and continuously. The ultrathin display module adopts the LED nixie tube. According to the LED nixie tube provided by the utility model, the position of the bonding pad is changed, the nixie tube formed by tightly connecting the patch LEDs is changed, the LED nixie tube emits light continuously without dark space, the height of a lamp cavity is reduced, the display module adopting the LED nixie tube can further reduce the height of a light guide plate and a light blocking layer foam, the whole LED nixie tube is thinner, the capacitance signal change is larger when a finger presses the LED nixie tube, and the service life of the LED nixie tube is prolonged. The signal-to-noise ratio of capacitive touch is increased, the touch stability and the anti-interference performance are improved, and the strict signal-to-noise ratio requirement of a product can be met more easily.

Description

Technical Field

[0001] The utility model belongs to the technical field of display devices, and in particular relates to a patch LED, an LED digital tube, an ultra-thin display module and household appliances. Background Art

[0002] LED digital tube is a semiconductor light-emitting device. The basic unit is a light-emitting diode. Relative current is input through different pins to make it light up and display numbers. It is widely used in home appliances such as air conditioners, water heaters, and refrigerators.

[0003] like Figure 1 As shown, traditional SMD LEDs have pads on both short sides, requiring solder mask treatment between the lamps. This prevents zero gaps between LEDs, with gaps of 0.2mm or more existing. This gap can cause discontinuous and uneven light emission. The lamp cavity of existing digital screens must be at least 1.5mm high to achieve uniform light distribution and eliminate dark areas. If the cavity is reduced to 1.0mm, uneven light emission will occur.

[0004] In the prior art, in order to meet the LED's light travel requirements and achieve uniform light emission, the lamp cavity thickness is increased. For example, in the Chinese utility model patent application filed by the applicant, with publication number CN220155113U, titled "A Thin Display Module with a Split Retracted Digital Tube," the digital tube is made into a separate digital tube circuit, which is placed on the back of the main circuit board. The height of the cavity formed by the combined thickness of the foam layer and the main circuit board meets the LED lamp bead's light travel requirements, resulting in light diffusion and a surface light source. However, this structure, in which the foam layer thickness and the PCB thickness form a cavity height of at least 2.6 mm to meet the LED lamp bead's light travel requirements, is complex in process, high in cost, and thick. Summary of the Invention

[0005] The technical problem solved by the utility model is to provide a chip LED with a changeable solder pad position, a digital tube composed of LEDs with a changeable solder pad position, which emits continuous light without dark areas and reduces the height of the lamp cavity. The display module using the LED digital tube can further reduce the height of the light guide plate and the light-blocking layer foam, making the whole thinner, with a stable signal and a higher signal-to-noise ratio.

[0006] Technical solution: In order to solve the above technical problems, the technical solution adopted by this utility model is as follows:

[0007] A chip LED has solder pads arranged on long sides, and solder pads on opposite long sides are staggered or symmetrically arranged.

[0008] An LED digital tube adopts the patch LED described in the claim, wherein the short sides of the patch LED are connected end to end and tightly connected between the end and the end to form an LED digital tube with an "8" display structure and uniform and continuous light emission.

[0009] Furthermore, there is no gap or a gap of less than 0.1 mm between the SMD LEDs connected end to end.

[0010] Furthermore, a plurality of SMD LEDs are arranged on a PCB circuit board, and a light-blocking structure is arranged around the periphery of the SMD LEDs to form a plurality of independent lamp cavities of an 8-shaped LED digital tube.

[0011] Furthermore, the height of the lamp cavity is 0.5 mm to 1.5 mm.

[0012] Furthermore, the height of the lamp cavity is 1 mm.

[0013] An ultra-thin display module adopts the above-mentioned LED digital tube.

[0014] Furthermore, the ultra-thin display module includes a diaphragm, a light-blocking layer, a light guide plate and a PCB circuit board arranged in sequence from top to bottom, and the LED digital tube is arranged on the PCB circuit board.

[0015] Furthermore, the light-blocking layer is arranged on the periphery of the light guide plate to form a plurality of independent light-emitting areas, and a conductive layer for sensing human body capacitance is provided on the PCB circuit board.

[0016] Furthermore, the thickness of the light blocking layer and the light guide plate is 0.5 mm to 1.0 mm.

[0017] A home appliance adopts the ultra-thin display module, and the ultra-thin display module is arranged in the panel of the home appliance.

[0018] Beneficial effects: Compared with the prior art, the utility model has the following advantages:

[0019] (1) The SMD LED of the present invention adjusts the soldering pad to the long side, and the SMD LED is arranged vertically and closely with the 8-shaped end of the digital screen. There is no gap or a gap of less than 0.1mm between the SMD LEDs 1 connected end to end. The SMD LED soldering pad is on the long side, so that the short side can be closely connected end to end, making the light continuous, without breakpoints and dark areas, and more uniform. This reduces the distance required for the light to travel and reduces the height of the lamp cavity. The lamp cavity can achieve a height of 0.5mm~1.5mm and uniform light emission.

[0020] (2) The ultra-thin display module using LED digital tubes has a light-blocking layer and a light-guiding plate with a thickness that is consistent with the thickness of the lamp cavity of the LED digital tube, set to 1 mm, which is thinner than the 1.5 mm of the existing ultra-thin display module, saving more materials and installation space.

[0021] (3) Human touch passes through the 1mm thick light guide plate and the 0.02mm diaphragm to the conductive layer on the PCB circuit board that senses the human body capacitance. The touch signal travels a total distance of 1.02mm. The capacitance signal induced by the copper foil conductive layer is stronger and more stable, making the touch operation of the entire display module more stable, with a strong and sensitive signal. The thinner the light guide plate, the higher the signal-to-noise ratio of capacitive touch, and the better the stability and anti-interference performance of touch, making it easier to meet the product's stringent signal-to-noise ratio requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the welding of LED digital tubes made of existing SMD LEDs;

[0023] Figure 2 This is the top view of the SMD LED of this application;

[0024] Figure 3 This is a bottom view of the SMD LED of this application;

[0025] Figure 4 This is a schematic diagram of two adjacent SMD LEDs soldered together in this application;

[0026] Figure 5 This is a schematic diagram of the LED digital tube structure of this application;

[0027] Figure 6 This is an exploded view of the ultra-thin display module of this application;

[0028] Figure 7 This is a partial structural diagram of the ultra-thin display module of the present application;

[0029] Figure 8 yes Figure 7 A magnified view of part of the structure. DETAILED DESCRIPTION

[0030] The present invention will be further illustrated below with reference to specific embodiments. The embodiments are implemented based on the technical solutions of the present invention. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. Example

[0031] like Figures 2-4 As shown, this embodiment discloses a chip LED. Unlike the existing chip LED where the solder pads are located at both ends, the solder pads 2 of the chip LED 1 of this embodiment are arranged on the long side 11. The two long sides 11 are respectively provided with solder pads, and the solder pads 2 on the opposite long sides 11 are staggered or symmetrically arranged. Since the width of the chip LED is small, the staggered arrangement is preferred, such as Figure 3 or Figure 4 shown. Example

[0032] like Figure 5 As shown, this embodiment discloses an LED digital tube, which adopts the chip LED 1 of Example 1. Several chip LEDs 1 are arranged on a PCB circuit board 4 to form an LED digital tube with uniform and continuous light emission in an "8"-shaped display structure. In the "8"-shaped display structure, according to the display requirements, the short sides 12 of the chip LEDs 1 are connected end to end and tightly connected end to end, and there is no gap or a gap of less than 0.1mm between the chip LEDs 1 connected end to end. The solder pads of the chip LEDs are on the long sides 11, so that the short sides 12 can be tightly connected end to end, making the light emission continuous, without breakpoints and dark areas, and making the light emission more uniform, thereby reducing the required distance of the light.

[0033] A light-blocking structure 5 is provided around the periphery of the SMD LEDs 1 to form several independent lamp cavities 31 of the 8-shaped LED digital tube 3. Several SMD LEDs 1 are arranged on a PCB circuit board 4. The light-blocking structure 5 is provided around the periphery of the SMD LEDs 1. Together with the PCB circuit board 4, the light-blocking structure 5 forms several independent lamp cavities 31 of the 8-shaped LED digital tube 3.

[0034] The patch LED1 is a bottom-emitting device, and the light is projected upward. The patch LED1 requires a certain spatial height to meet the requirements of the light stroke. The existing technology uses a lamp cavity with a relatively high thickness, and uses a thicker cavity to form the light stroke. The seamless design between the patch LEDs 1 of this embodiment makes the light emission continuous, without breakpoints and dark areas, and the light emission is more uniform, thereby reducing the stroke required for the light to achieve uniform light emission and reducing the height of the lamp cavity. The height of the lamp cavity 31 in this embodiment can achieve a height of 0.5mm~1.5mm and the light emission is uniform. As a preferred embodiment, the height of the lamp cavity 31 can be set to 1mm, or it can be set to 0.8mm, 0.9mm, 1.1mm, 1.2mm, etc., which can meet the requirements of light formation and emit uniform light. Example

[0035] This embodiment discloses an ultra-thin display module, which uses the LED digital tube 3 of embodiment 2. The ultra-thin display module includes a diaphragm 6, a light blocking layer 7, a light guide plate 8 and a PCB circuit board 4, which are arranged in sequence from top to bottom.

[0036] The LED digital tube 3 is set on the PCB circuit board 4, and the light blocking layer 7 is set on the periphery of the light guide plate 8 to form several independent light-emitting display areas. Other LED lamp beads 9 are also set on the PCB circuit board 4 as the light source of other light-emitting display areas. In this embodiment, the other display areas use side-emitting LED lamp beads 9 set on one side or both sides of the light guide plate 8. After being uniformed by the light guide plate 8, they pass through the diaphragm to emit light.

[0037] When used in a display module, the light-blocking layer 7 is an integral structure and also forms the light-blocking structure of the LED digital tube 3. The light-blocking layer 7 is made of black foam, and the thickness of the light-blocking layer 7 and the light guide plate 8 is 0.5 mm to 1.0 mm.

[0038] Preferably, the thickness of the light blocking layer 7 and the light guide plate 8 can be consistent with the thickness of the lamp cavity of the LED digital tube 3, which is set to 1 mm, which is thinner than the 1.5 mm of the existing ultra-thin display module, saving more materials and installation space.

[0039] In the ultra-thin display module of this embodiment, a conductive layer that senses human body capacitance is provided on the PCB circuit board 4 as a sensor. The conductive layer is copper foil or other conductive material etched or attached to the control circuit board. Human touch reaches the conductive layer on the PCB circuit board 4 that senses human body capacitance through the 1mm thick light guide plate 8 and the 0.02mm diaphragm. The touch signal travels a total distance of 1.02mm. The thickness of the diaphragm is even negligible. The capacitance signal strength sensed by the copper foil conductive layer is stronger and more stable, making the touch operation of the entire display module more stable and the signal strength more sensitive.

[0040] Capacitive touch sensing works by inducing a change in capacitance when a finger touches the sensor's overlay. A touch-sensing controller measures this capacitance change and converts it to the digital domain through analog-to-digital conversion, registering a touch when the measured value exceeds a predefined threshold. The digitized capacitance change caused by a finger touch is called the signal, while unintended changes in the digitized capacitance not caused by a finger touch are called noise.

[0041] The capacitance generated by a finger can be considered a parallel-plate capacitor, where the finger and sensor are two conductive plates, and the overlay is the dielectric between the plates. The capacitance change caused by a finger is directly proportional to the dimensions of the sensor and finger (i.e., the plate area), and the dielectric constant of the overlay material; however, it is inversely proportional to the overlay thickness on the sensor (i.e., the distance between the plates). A thicker overlay increases the distance between the plates, resulting in a smaller capacitance change. This reduces the signal-to-noise ratio (SNR), failing to meet product performance requirements.

[0042] The light guide plate 8 of the present invention serves as a covering layer. The thinner the light guide plate 8 is, the greater the change in the capacitance signal when the finger is pressed, the larger the signal amount becomes, and the set touch predefined threshold can be correspondingly increased. In this way, the signal-to-noise ratio of the touch will increase, the stability and anti-interference of the touch will be better, and it will be easier to meet the product's stringent signal-to-noise ratio requirements. Example

[0043] A home appliance display panel employs the aforementioned ultra-thin display module, which is disposed within the appliance panel. The panel can be made of glass, acrylic, or an in-mold molded panel made using an in-mold molding process using materials such as ABS or PC. Panel 1 protects and encapsulates the ultra-thin display module. Example

[0044] A household appliance adopts the LED digital tube of Example 2 or the thin display module of Example 3 or the household appliance display panel of Example 4, and the household appliance includes but is not limited to a washing machine, a refrigerator, a dishwasher, a water purifier pipeline machine, a tea bar machine, a range hood, a water heater, an oven, a sweeper, an air conditioner or other household appliances.

[0045] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. An LED digital tube, characterized in that: The invention comprises a chip LED (1), wherein a soldering pad (2) of the chip LED (1) is arranged on a long side (11), and a short side (12) of the chip LED (1) is connected end to end and tightly connected between the end and the end, thereby forming an LED digital tube with an "8" display structure and uniform and continuous light emission.

2. The LED digital tube according to claim 1, characterized in that: There is no gap or a gap of less than 0.1 mm between the SMD LEDs (1) connected end to end.

3. The LED digital tube according to claim 1, characterized in that: A plurality of SMD LEDs (1) are arranged on a PCB circuit board (4), and a light-blocking structure (5) is arranged on the periphery of the SMD LEDs (1) to form a plurality of independent lamp cavities (31) of an 8-shaped LED digital tube (3).

4. The LED digital tube according to claim 3, characterized in that: The height of the lamp cavity (31) is 0.5 mm to 1.5 mm.

5. The LED digital tube according to claim 4, characterized in that: The height of the lamp cavity (31) is 1 mm.

6. An ultra-thin display module, characterized in that: An LED digital tube (3) as described in any one of claims 1 to 5 is used.

7. The ultra-thin display module according to claim 6, wherein: The ultra-thin display module comprises a diaphragm (6), a light-blocking layer (7), a light guide plate (8) and a PCB circuit board (4) which are arranged in sequence from top to bottom, and the LED digital tube (3) is arranged on the PCB circuit board (4).

8. The ultra-thin display module according to claim 7, wherein: The light-blocking layer (7) is arranged on the periphery of the light guide plate (8) to form a plurality of independent light-emitting areas, and a conductive layer for sensing human body capacitance is provided on the PCB circuit board (4).

9. The ultra-thin display module according to claim 7, wherein: The thickness of the light-blocking layer (7) and the light guide plate (8) is 0.5 mm to 1.0 mm.

10. A household appliance, characterized in that: The ultra-thin display module according to any one of claims 6 to 9 is used, and the ultra-thin display module is arranged in a home appliance panel.

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