Backlight device of key light guide plate

Abstract

The utility model discloses a key light guide plate backlight device which comprises a device body (1), an LED lamp (2), a light guide plate (3), a key (4) and a circuit board (5) matched with the key (4), and the key (4) is embedded in the upper surface of the device body (1); the LED lamp (2) is arranged on the side face of the device body (1), the light guide plate (3) is arranged above the circuit board (5), and the light-emitting face of the LED lamp (2) is opposite to the side face of the light guide plate (3). The light guide plate (3) is internally provided with a plurality of lattice points used for changing the propagation path of incident light, and the lattice points are matched with one another so that the upper surface of the light guide plate (3) can emit light evenly. The LED lamp of the key light guide plate backlight device is mounted on the side surface of the key, and uniform light is realized through the light guide plate, so that the backlight brightness of the key is uniform.

Description

Technical Field

[0001] The utility model relates to a key light guide plate, and particularly to a backlight device for a key light guide plate. Background Art

[0002] As an illumination component of the operation interfaces of various cockpit equipment systems, the key light guide plate mainly functions to provide indication illumination for various operating devices.

[0003] In the existing backlight devices for key light guide plates, LED lights are placed on the circuit printed board. Since the LED lights are all arranged at the bottom, restricted by the space of the circuit printed board, the layout of the LED lights often cannot be evenly distributed. This uneven light source will cause obvious brightness differences in the backlight on the key panel, thus affecting the uniformity requirement of the product for the backlight. Moreover, due to the limited space of the circuit printed board, there will be a situation where the number of LED lights is insufficient. If the number of LED lights is insufficient, especially on a relatively large-area light guide plate, it is very difficult to achieve a uniform backlight effect.

[0004] Therefore, the existing backlight device for the key light guide plate using the bottom light entry method is very difficult to meet the uniformity requirement of the product for the backlight, and the later-stage dimming is very difficult. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a backlight device for a key light guide plate. The LED lights of the backlight device for the key light guide plate are installed on the side of the key, and uniform light is achieved through the light guide plate, so that the backlight brightness of the key is uniform.

[0006] To achieve the above purpose, the utility model provides a backlight device for a key light guide plate. The backlight device for the key light guide plate includes a device body 1, LED lights 2, a light guide plate 3, a key 4, and a circuit board 5 cooperating with the key 4. The key 4 is embedded in the upper surface of the device body 1;

[0007] The LED lights 2 are arranged on the side of the device body 1. The light guide plate 3 is arranged above the circuit board 5, and the light-emitting surface of the LED lights 2 is arranged opposite to the side surface of the light guide plate 3;

[0008] A plurality of light points for changing the propagation path of incident light are arranged in the light guide plate 3, and the plurality of light points cooperate with each other so that the upper surface of the light guide plate 3 emits light evenly.

[0009] Preferably, the center line of the LED lights 2 in the height direction is at the same height as the center line of the light guide plate 3 in the height direction.

[0010] Preferably, the center line of the LED lamp 2 in the height direction and the upper ridge line of the light guide plate 3 facing the LED lamp 2 jointly define a first surface, and the center line of the LED lamp 2 in the height direction and the lower ridge line of the light guide plate 3 facing the LED lamp 2 jointly define a second surface. The angle between the first surface and the second surface is greater than the light-emitting angle of the LED lamp 2.

[0011] Preferably, a groove 11 is provided on the side surface of the device body 1, a reflective film is provided on the inner wall of the groove 11, and the LED lamp 2 is arranged in the groove 11.

[0012] Preferably, a diffusive reflection film 6 is provided between the light guide plate 3 and the circuit board 5.

[0013] Preferably, the diffusive reflection film 6 is adhered to the circuit board 5, and the diffusive reflectivity of the diffusive reflection film 6 is not less than 95%.

[0014] Preferably, the dot is set to be hemispherical.

[0015] Preferably, the position and size of the dot are adjustable.

[0016] Preferably, a hole for cooperating with the button 4 is provided on the light guide plate 3.

[0017] According to the above technical solution, the LED lamp of the present utility model is arranged on the side surface of the device body, and the light-emitting surface of the LED lamp is arranged opposite to the side surface of the light guide plate, so that more light emitted by the LED lamp can enter the side surface of the light guide plate. After passing through the light guide plate, the propagation path of the light is changed, so that uniform light can be emitted from the upper surface of the light guide plate for the backlight of the button panel.

[0018] When light travels from an optically denser medium to an optically less dense medium, at the incident surface, the light will simultaneously undergo reflection and refraction. Moreover, as the incident angle increases, the reflected energy becomes stronger and stronger; while the refracted energy becomes smaller and smaller. That is, as the incident angle increases, more light energy will be reflected, and less light energy will be refracted. By using this characteristic of light, the structure of the light guide plate 3 can be designed, and the propagation path of the light can be corrected through the dots in the light guide plate 3 to achieve the purpose of uniform light emission on the upper surface of the light guide plate 3.

[0019] A plurality of dots for changing the incident light path are arranged in the light guide plate, and the uniformization effect of the light is realized by multiple reflections and refractions of the light in the light guide plate, and the uniformly processed light is emitted from the upper surface of the light guide plate.

[0020] A tactile switch for cooperating with the button is arranged on the circuit board. When the button is pressed, the tactile switch acts, thereby realizing the functional operation of the button.

[0021] Other features and advantages of the present utility model will be described in detail in the following specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings are used to provide a further understanding of the present utility model and constitute a part of the specification. Together with the following specific implementation, they are used to explain the present utility model, but do not constitute a limitation to the present utility model. In the drawings:

[0023] Figure 1 is a button light guide plate backlight device.

[0024] DESCRIPTION OF THE REFERENCE NUMERALS

[0025] 1 Device body 2 LED lamp

[0026] 3 Light guide plate 4 Button

[0027] 5 Circuit board 11 Groove

[0028] 6 Diffusion film 7 Tactile switch SPECIFIC IMPLEMENTATION

[0029] The following will describe in detail the specific implementation of the present utility model with reference to the drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present utility model and does not limit the present utility model.

[0030] In the present utility model, unless otherwise stated, the directional terms such as "upper surface, side, above, relative" included in the terms only represent the orientation of the term in the normal use state, or the common name understood by those skilled in the art, and should not be regarded as a limitation to the term.

[0031] Referring to the button light guide plate backlight device shown in the figure, the button light guide plate backlight device includes a device body 1, an LED lamp 2, a light guide plate 3, a button 4 and a circuit board 5 that cooperates with the button 4. The button 4 is embedded in the upper surface of the device body 1;

[0032] The LED lamp 2 is arranged on the side of the device body 1, the light guide plate 3 is arranged above the circuit board 5, and the light emitting surface of the LED lamp 2 is arranged opposite to the side of the light guide plate 3;

[0033] A plurality of light points for changing the propagation path of incident light are arranged in the light guide plate 3, and the plurality of light points cooperate with each other so that the upper surface of the light guide plate 3 emits light evenly.

[0034] Through the implementation of the above technical solution, the LED lamp 2 is arranged on the side of the device body 1, and the light-emitting surface of the LED lamp 2 is arranged opposite to the side of the light guide plate 3, so that more light emitted by the LED lamp 2 will enter the side of the light guide plate 3. After passing through the light guide plate 3, the purpose of changing the light propagation path is achieved, so that uniform light can be emitted from the upper surface of the light guide plate 3 for the backlight of the key panel.

[0035] When light rays are incident from an optically denser medium to an optically rarer medium, at the incident surface, the light rays will simultaneously undergo reflection and refraction. Moreover, as the incident angle increases, the reflected energy becomes stronger and stronger; while the refracted energy becomes smaller and smaller. That is, as the incident angle increases, more light energy will be reflected, and less light energy will be refracted. Utilizing this characteristic of light, the structure of the light guide plate 3 can be designed, and the propagation path of the light rays can be corrected through the dot patterns in the light guide plate 3 to achieve the purpose of uniform light emission from the upper surface of the light guide plate 3.

[0036] A plurality of dot patterns for changing the incident light path are arranged in the light guide plate 3. The uniformization effect of the light rays is achieved by using the multiple reflections and refractions of the light rays in the light guide plate 3, and the light rays after the uniformization treatment are emitted from the upper surface of the light guide plate 3.

[0037] A tactile switch 7 for cooperating with the key 4 is arranged on the circuit board 5. Pressing the key 4 causes the tactile switch 7 to act, thereby realizing the functional operation of the key.

[0038] In this embodiment, preferably, the center line of the LED lamp 2 in the height direction is at the same height as the center line of the light guide plate 3 in the height direction.

[0039] The light guide plate 3 is arranged at the same height as the LED lamp 2, so that the light rays emitted by the LED lamp 2 can be collected by the light guide plate 3 to the greatest extent, thereby improving the utilization efficiency of the light rays.

[0040] In this embodiment, preferably, the center line of the LED lamp 2 in the height direction and the upper edge line of the light guide plate 3 facing the LED lamp 2 jointly determine a first surface, and the center line of the LED lamp 2 in the height direction and the lower edge line of the light guide plate 3 facing the LED lamp 2 jointly determine a second surface. The included angle between the first surface and the second surface is greater than the light-emitting angle of the LED lamp 2.

[0041] The included angle between the first surface and the second surface is greater than the light-emitting angle of the LED lamp 2, so that the light guide plate 3 can collect the light rays emitted by the LED lamp 2 more effectively, improving the utilization efficiency of the light rays.

[0042] In this embodiment, preferably, a groove 11 is arranged on the side of the device body 1, a reflective film is arranged on the inner wall of the groove 11, and the LED lamp 2 is arranged in the groove 11.

[0043] By arranging the LED lamp 2 in the groove 11 and providing a reflective film in the groove 11, the light emitted by the LED lamp 2 is finally emitted from the surface facing the light guide plate 3. After the emitted light is homogenized by the light guide plate 3, it is used as the backlight of the key, which can effectively avoid the dissipation of light energy and improve the utilization efficiency of light energy.

[0044] In this embodiment, preferably, a diffusive reflection film 6 is provided between the light guide plate 3 and the circuit board 5.

[0045] Through this diffusive reflection film 6, the utilization efficiency of light energy can be further improved, and light energy dissipation at the bottom of the key light guide plate backlight device can be avoided, so that as much light energy as possible is used to increase the backlight brightness of the key 4.

[0046] Meanwhile, the diffusive reflection film 6 diffuses the light, avoiding the concentration of light and being conducive to the homogenization of the backlight brightness.

[0047] In this embodiment, preferably, the diffusive reflection film 6 is attached to the circuit board 5, and the diffusive reflectivity of the diffusive reflection film 6 is not less than 95%.

[0048] In this embodiment, preferably, the dot patterns are set as hemispherical.

[0049] When light rays are incident from an optically denser medium to an optically less dense medium, at the incident surface, the light rays will simultaneously undergo reflection and refraction. Moreover, as the incident angle increases, the reflected energy of the light rays becomes stronger and stronger; while the refracted energy becomes smaller and smaller. That is, as the incident angle increases, more light energy will be reflected, and less light energy will be refracted. Utilizing this property of light, the structure of the light guide plate 3 can be designed, and the propagation path of the light rays can be corrected through the dot patterns in the light guide plate 3 to achieve the purpose of uniform light emission on the upper surface of the light guide plate 3.

[0050] The microstructure of the lower surface of the light guide plate 3 is designed, mainly including using laser dot pattern etching treatment on the lower surface of the light guide plate 3 to form hemispherical holes on the lower surface of the light guide plate 3, which are the dot patterns. When the light rays contact the surfaces of these hole-shaped dot patterns, reflection and refraction will occur. By utilizing the interaction between the light rays and these dot patterns, the propagation path of the light rays can be changed. Setting the dot patterns as hemispherical can effectively improve the utilization effect of the light rays in the light guide plate 3.

[0051] With the help of software, the propagation path of the light rays emitted by the LED lamp 2 in the light guide plate 3 can be simulated. Through the software, the lower surface of the light guide plate 3 can be designed with the aim of improving uniform light emission. By adjusting the position and size of the dot patterns, high-uniformity light emission for different light sources can be achieved, where different light sources include different layouts of LED lamps and different numbers of LED lamps.

[0052] In this embodiment, preferably, the position and size of the dots can be adjusted.

[0053] In this embodiment, preferably, the light guide plate 3 is provided with holes that cooperate with the key 4.

[0054] When pressing the key 4 downward, the key 4 needs to contact the touch switch 7 to realize its function. Since the light guide plate 3 is arranged above the circuit board 5, in order to ensure the realization of the function of the key 4, a round hole is provided on the light guide plate 3 to facilitate the passage of the key 4. Preferably, the diameter of the round hole is 1 mm to 1.5 mm larger than the diameter of the key guide post, so that when the key guide post cooperates with the round hole, there will be no jamming during the up and down movement.

[0055] In the actual design and production process, the model of the LED lamp 2 can be replaced according to the requirement of the light emission color of the light guide plate 3 needed by the key 4. Since the light guide plate 3 has a good effect of uniform light emission, the LED lamps 2 can be arranged at intervals according to the actual space layout in the device body 1, or even the LED lamps do not need to be evenly distributed.

[0056] Since the key light guide plate backlight device has a high utilization rate of light energy, in this key light guide plate backlight device, the LED lamps can be arranged at intervals. In the actual product, the distance between two adjacent LED lamps 2 is designed as the width dimension of 1 to 6 LED lamps. Preferably, when the distance between two adjacent LED lamps 2 is designed as the width dimension of 4 LED lamps, the backlight brightness of this key light guide plate backlight device can meet the requirements of most usage scenarios.

[0057] The preferred embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solutions of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0058] In addition, it should be noted that, among the various specific technical features described in the above specific embodiments, they can be combined in any suitable way without contradiction. To avoid unnecessary repetition, the present invention will not separately describe various possible combination methods.

[0059] In addition, any combination can be made between various different embodiments of the present invention, as long as it does not violate the idea of the present invention, it should also be regarded as the content disclosed by the present invention.

Claims

1. A backlight device for a button light guide plate, characterized in that, The key light guide plate backlight device includes a device body (1), an LED lamp (2), a light guide plate (3), a key (4), and a circuit board (5) that cooperates with the key (4). The key (4) is embedded in the upper surface of the device body (1). The LED lamp (2) is arranged on the side of the device body (1), the light guide plate (3) is arranged above the circuit board (5), and the light emitting surface of the LED lamp (2) is arranged opposite to the side surface of the light guide plate (3). A plurality of light points for changing the propagation path of incident light are arranged in the light guide plate (3), and the plurality of light points cooperate with each other so that the upper surface of the light guide plate (3) emits light evenly.

2. The key light guide plate backlight device according to claim 1, wherein The center line of the LED lamp (2) in the height direction is at the same height as the center line of the light guide plate (3) in the height direction.

3. The key light guide plate backlight device according to claim 2, wherein, The center line of the LED lamp (2) in the height direction and the upper edge line of the light guide plate (3) facing the LED lamp (2) jointly determine a first surface, and the center line of the LED lamp (2) in the height direction and the lower edge line of the light guide plate (3) facing the LED lamp (2) jointly determine a second surface. The included angle between the first surface and the second surface is greater than the light emitting angle of the LED lamp (2).

4. The backlight device of the key light guide plate according to claim 1, wherein A groove (11) is arranged on the side of the device body (1), a reflective film is arranged on the inner wall of the groove (11), and the LED lamp (2) is arranged in the groove (11).

5. The key light guide plate backlight device according to claim 2, wherein A diffusing film (6) is arranged between the light guide plate (3) and the circuit board (5).

6. The backlight device of the button light guide plate according to claim 5, wherein The diffusing film (6) is attached to the circuit board (5), and the diffuse reflectivity of the diffusing film (6) is not less than 95%.

7. The key light guide plate backlight device according to claim 1, characterized in that The light points are arranged in a hemispherical shape.

8. The backlight device of a button light guide plate according to claim 7, characterized in that, The positions and sizes of the light points are adjustable.

9. The backlight device of a key light guide plate according to claim 1, wherein Holes that cooperate with the key (4) are arranged on the light guide plate (3).

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