Structure and method for flexibly adjusting light emitting angle of backlight

Abstract

The invention belongs to the technical field of display, and particularly provides a method for flexibly adjusting the light emitting angle of backlight rays, which comprises the following steps of: horizontally placing an LED lamp panel at the bottom of a backlight cavity, and horizontally bonding a Fresnel lens on the LED lamp panel by using an adhesive; the arrangement of the LEDs on the lamp panel, the tooth shape of each annular belt of the Fresnel lens and the vertical bonding distance between the LED lamp panel and the Fresnel lens are designed in a simulation mode, so that light rays emitted by the LEDs are emitted out in a parallel light mode after passing through the Fresnel lens; the two sets of height adjusting sliding blocks are connected with the LED lamp panel through the two transparent elastic bodies, in the up-down sliding process of the two sets of height adjusting sliding blocks, the corresponding transparent elastic bodies can be compressed and stretched, the LED lamp panel and the bonded Fresnel lens are driven to rotate by a small angle in a backlight cavity, and the LED lamp panel and the Fresnel lens are driven to rotate by a small angle. The light emitting angle of the backlight light in the horizontal direction is flexibly changed, flexible offset of the backlight light is achieved, and the applicability of the liquid crystal display module in a special environment is improved.

Description

Technical Field

[0001] The present invention belongs to the field of display technology, and in particular relates to a structure and method for flexibly adjusting the light emitting angle of backlight. Background Art

[0002] The liquid crystal display panel itself does not emit light, but only plays the role of changing the local transmission and reflection characteristics under the control of the electric field. A complete liquid crystal display requires a backlight for illumination and is widely used in mobile phones, televisions, computers and other fields. The common maximum brightness parameter in liquid crystal display refers to the maximum brightness in the center normal direction, but when the liquid crystal display is installed in special environments such as smart cockpits and aircraft, due to the limitations of the installation location and environmental space, the human eye does not view in the normal direction of the display. The improvement of the brightness in the normal direction of the display cannot meet the needs of viewers. On this basis, a structure and method for flexibly adjusting the light emission angle of the backlight is proposed. Summary of the invention

[0003] The present invention aims to provide a structure and method for flexibly adjusting the light emission angle of backlight, so as to solve the technical problems raised in the above-mentioned background technology.

[0004] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: The structure for flexibly adjusting the light output angle of the backlight comprises a backlight cavity, support columns are arranged on both sides of the backlight cavity, and each group of the support columns is sleeved with a height adjustment slider; an LED light board is horizontally placed on the bottom surface of the backlight cavity, and a Fresnel lens is horizontally bonded to the surface of the LED light board by an adhesive; The two sets of height adjustment sliders are connected to the two ends of the LED light board through transparent elastic bodies. When the two sets of height adjustment sliders slide up and down, they drive the LED light board and the Fresnel lens to rotate at an angle in the backlight cavity, thereby changing the horizontal light output angle of the backlight.

[0005] The present invention provides a method for flexibly adjusting the light output angle of a backlight, comprising the following steps: Place the LED light board horizontally at the bottom of the backlight cavity, and glue a Fresnel lens horizontally on the LED light board with adhesive; The arrangement of LEDs on the light board, the tooth shape of each ring of the Fresnel lens, and the vertical bonding distance between the LED light board and the Fresnel lens are simulated and designed, so that the light emitted by the LED passes through the Fresnel lens and is emitted as parallel light, thereby improving the collimation of the emitted light; The two sets of height adjustment sliders and the LED light board are connected by two transparent elastic bodies. When the two sets of height adjustment sliders slide up and down, the corresponding transparent elastic bodies will be compressed and stretched, driving the LED light board and the bonded Fresnel lens to rotate at a small angle in the backlight cavity, thereby flexibly changing the horizontal light output angle of the backlight.

[0006] A further improvement is that elongated holes are opened on both sides of the backlight cavity, and the diameter of the support column is larger than the width of the elongated holes, so that the light passing through the elongated holes can be reflected back into the backlight cavity as much as possible to reduce light leakage.

[0007] A further improvement is that the exterior of the backlight cavity is subjected to a light-isolating treatment such as blackening, spray painting, etc. after being subjected to a reflective treatment to prevent external light leakage.

[0008] A further improvement is that the ring shaft of the height adjustment slider is sleeved on the support column to adjust the height up and down.

[0009] The present invention provides a structure for flexibly adjusting the light emitting angle of backlight, comprising a backlight cavity, support columns are arranged on both sides of the backlight cavity, and a height adjustment slider is sleeved on each group of the support columns; an LED light board is horizontally placed on the bottom surface of the backlight cavity, a Fresnel lens is horizontally bonded to the surface of the LED light board by an adhesive, and a transparent micro lens array is arranged above the Fresnel lens; The two sets of height adjustment sliders are connected to the two ends of the transparent microlens array through transparent elastic bodies. When the two sets of height adjustment sliders slide up and down, they drive the transparent microlens array to rotate in the backlight cavity, thereby changing the horizontal light output angle of the backlight.

[0010] The present invention also provides a method for flexibly adjusting the light output angle of backlight, comprising the following steps: The LED light board is placed horizontally at the bottom of the backlight cavity, and a Fresnel lens is horizontally bonded to the LED light board with adhesive; The arrangement of LEDs on the light board, the tooth shape of each ring of the Fresnel lens, and the vertical bonding distance between the LED light board and the Fresnel lens are simulated and designed, so that the light emitted by the LED passes through the Fresnel lens and is emitted as parallel light, thereby improving the collimation of the emitted light; The two sets of height adjustment sliders and the transparent microlens array are connected by two transparent elastic bodies. When the two sets of height adjustment sliders slide up and down, the corresponding transparent elastic bodies will be compressed and stretched, driving the transparent microlens array to rotate at a small angle in the backlight cavity. According to the requirements of the environment, the horizontal light output angle of the backlight can be flexibly changed.

[0011] A further improvement is that elongated holes are opened on both sides of the backlight cavity, and the diameter of the support column is larger than the width of the elongated holes, so that the light passing through the elongated holes can be reflected back into the backlight cavity as much as possible to reduce light leakage.

[0012] A further improvement is that the exterior of the backlight cavity is subjected to a light-isolating treatment such as blackening, spray painting, etc. after being subjected to a reflective treatment to prevent external light leakage.

[0013] A further improvement is that the ring shaft of the height adjustment slider is sleeved on the support column to adjust the height up and down.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides two structural designs for changing the light output angle of a direct-type backlight. Height adjustment sliders are installed on both sides of the backlight cavity to drive the LED light board or the transparent microlens array to rotate at a small angle in the backlight cavity, thereby achieving flexible offset of the backlight and improving the applicability of the liquid crystal display module in special environments.

[0015] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of a structure for flexibly adjusting the light emitting angle of backlight provided by Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the structure for flexibly adjusting the light emitting angle of the backlight provided in Embodiment 1 of the present invention rotated 10° to the right; Figure 3 It is a schematic diagram of the structure for flexibly adjusting the light emitting angle of the backlight provided by the present invention in Example 1 rotated 10° to the left; Figure 4 This is a schematic diagram of a structure for flexibly adjusting the light emitting angle of backlight provided by Embodiment 2 of the present invention; Figure 5 A schematic diagram of a structure for flexibly adjusting the light emitting angle of backlight provided in Embodiment 2 of the present invention, which is rotated right by 10°; Figure 6 A schematic diagram of a structure for flexibly adjusting the light emitting angle of backlight provided in Embodiment 2 of the present invention, which is rotated 10° to the left; Figure 7 This is the path of the light in Example 2 passing through the transparent microlens array rotated 10° to the left horizontally.

[0017] Reference numerals: 1. Support column; 2. Height adjustment slider; 3. Transparent elastomer; 4. Adhesive; 5. LED light board; 6. Fresnel lens; 7. Backlight cavity; 8. Transparent microlens array. DETAILED DESCRIPTION

[0018] To facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings, but the present invention can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the content disclosed in the present invention more thorough and comprehensive.

[0019] In the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", "provided with", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Example 1

[0020] This embodiment provides a technical solution for flexibly adjusting the light output angle of the backlight, specifically a design solution for a rotating bottom backlight LED lamp panel. Figure 1 As shown, its structure is mainly composed of a support column 1, a height adjustment slider 2, a transparent elastomer 3, an adhesive 4, an LED light board 5, a Fresnel lens 6 and a backlight cavity 7.

[0021] A method for rotating a bottom backlight LED light panel, comprising the following steps: The LED light board 5 is horizontally placed at the bottom of the backlight cavity 7. The lamp beads are white light LEDs with a regular size of 3×3mm and a light-emitting angle of 120°. A Fresnel lens 6 is horizontally bonded to the LED light board 5 with an adhesive 4.

[0022] The arrangement of LEDs on the lamp board, the tooth shape of each ring band of the Fresnel lens 6, and the vertical bonding distance between the LED lamp board 5 and the Fresnel lens 6 are simulated and designed, so that the light emitted by the LED is emitted as parallel light after passing through the Fresnel lens 6, thereby improving the collimation of the emitted light.

[0023] The height adjustment slider 2 and the LED light board 5 are connected by two transparent elastic bodies 3. When the height adjustment slider 2 slides up and down, the transparent elastic bodies 3 are compressed and stretched, driving the LED light board 5 and the bonded Fresnel lens 6 to rotate at a small angle in the backlight cavity 7 within a range of (-10~10°), so that the light output angle of the backlight in the horizontal direction can be flexibly changed according to the requirements of the environment, such as Figure 2 and 3 shown.

[0024] In this embodiment, slender holes are opened inside and outside the left and right sides of the backlight cavity 7. The slender holes opened on both sides of the backlight cavity 1 are used for connecting the height adjustment slider 2 to the LED light board 5 inside the backlight cavity 1 for height adjustment. There are two cylindrical support columns 1 inside the backlight cavity 7 structure. The inside of the backlight cavity 7 structure and the surface of the support column 1 are sprayed with reflective material. The diameter of the support column 1 is larger than the width of the slender hole, and the light passing through the slender hole can be reflected back into the backlight cavity 7 as much as possible to reduce light leakage. At the same time, the external area of ​​the backlight cavity 7 is treated with reflective treatment and then a layer of blackening, painting and other light-isolating treatment is performed to avoid external light leakage.

[0025] In this embodiment, the ring shaft of the height adjustment slider 2 is sleeved on the support column 1 to adjust the up and down height. The height adjustment slider 2 is connected to the transparent elastic body 3 inside the backlight cavity 7, and the other end of the transparent elastic body 3 is connected to the LED light board 5. When the height adjustment slider 2 adjusts the height, the transparent elastic bodies 3 arranged on the left and right will be stretched or compressed in the cavity, thereby driving the connected LED light board 5 to rotate at a small angle in the backlight cavity 7, ranging from (-10~10°), thereby realizing flexible offset of the backlight light and improving the applicability of the liquid crystal display module in special environments. Example 2

[0026] This embodiment provides a technical solution for flexibly adjusting the light emission angle of the backlight, specifically a design solution for rotating a transparent micro-lens array. Figure 4 As shown, its structure is mainly composed of a support column 1, a height adjustment slider 2, a transparent elastomer 3, an adhesive 4, an LED light board 5, a Fresnel lens 6, a backlight cavity 7 and a transparent microlens array 8.

[0027] A method for rotating a transparent microlens array comprises the following steps: The LED light board 5 is horizontally placed at the bottom of the backlight cavity 7. The lamp beads are white light LEDs with a regular size of 3×3mm and a light-emitting angle of 120°. A Fresnel lens 6 is horizontally bonded to the LED light board 5 with an adhesive 4.

[0028] The arrangement of LEDs on the lamp board, the tooth shape of each ring band of the Fresnel lens 6, and the vertical bonding distance between the LED lamp board 5 and the Fresnel lens 6 are simulated and designed, so that the light emitted by the LED is emitted as parallel light after passing through the Fresnel lens 6, thereby improving the collimation of the emitted light.

[0029] The two sets of height adjustment sliders 2 and the transparent micro lens array 8 are connected by two transparent elastic bodies 3. When the height adjustment sliders 2 slide up and down, the stretchable and compressible transparent elastic bodies 3 are driven to slide up and down, so that the transparent micro lens array 8 rotates within a range of (-10~10°), thereby flexibly changing the light emitting direction of the backlight as needed, such as Figure 5-6As shown, the path of the light passing through the transparent microlens array 8 rotated 10° to the left horizontally is as follows Figure 7 shown.

[0030] In the present embodiment, elongated holes are opened inside and outside the left and right sides of the backlight cavity 7. The elongated holes opened on both sides of the backlight cavity 1 are used for connecting the height adjustment slider 2 to the transparent microlens array 8 inside the backlight cavity 1 for height adjustment. There are two cylindrical support columns 1 inside the backlight cavity 7 structure. The inside of the backlight cavity 7 structure and the surface of the support columns 1 are sprayed with reflective materials. The diameter of the support columns 1 is larger than the width of the elongated holes, and the light passing through the elongated holes can be reflected back into the backlight cavity 7 as much as possible to reduce light leakage. At the same time, the external area of ​​the backlight cavity 7 is treated with reflective treatment and then subjected to a layer of light-isolating treatment such as blackening and spray painting to avoid external light leakage.

[0031] In this embodiment, the ring shaft of the height adjustment slider 2 is sleeved on the support column 1 to adjust the height up and down. The height adjustment slider 2 is connected to the transparent elastic body 3 inside the backlight cavity 7, and the other end of the transparent elastic body 3 is connected to the transparent microlens array 8. When the height adjustment slider 2 adjusts the height, the transparent elastic bodies 3 arranged on the left and right will be stretched or compressed in the cavity, thereby driving the connected transparent microlens array 8 to rotate at a small angle in the backlight cavity 7, ranging from (-10~10°), thereby realizing flexible offset of the backlight light and improving the applicability of the liquid crystal display module in special environments.

[0032] In summary, the present invention provides two structural designs for changing the light output angle of a direct-type backlight. Height adjustment sliders are installed on both sides of the backlight cavity to drive the LED light panel or the transparent microlens array to rotate at a small angle in the backlight cavity, thereby achieving flexible offset of the backlight and improving the applicability of the liquid crystal display module in special environments.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A structure for flexibly adjusting the light output angle of a backlight, including a backlight cavity, characterized in that: Support columns are arranged on both sides of the backlight cavity, and each group of the support columns is sleeved with a height adjustment slider; an LED light board is horizontally placed on the bottom surface of the backlight cavity, and a Fresnel lens is horizontally arranged on the surface of the LED light board; The two sets of height adjustment sliders are connected to the two ends of the LED light board through transparent elastic bodies. When the two sets of height adjustment sliders slide up and down, they drive the LED light board and the Fresnel lens to rotate at an angle in the backlight cavity, thereby changing the horizontal light output angle of the backlight.

2. A method for flexibly adjusting the light output angle of a backlight, characterized in that: The following steps are involved: Place the LED light board horizontally at the bottom of the backlight cavity, and glue a Fresnel lens horizontally on the LED light board with adhesive; The arrangement of LEDs on the light board, the tooth shape of each ring of the Fresnel lens, and the vertical bonding distance between the LED light board and the Fresnel lens are simulated and designed, so that the light emitted by the LED passes through the Fresnel lens and is emitted as parallel light; The two sets of height adjustment sliders and the LED light board are connected by two transparent elastic bodies. When the two sets of height adjustment sliders slide up and down, the corresponding transparent elastic bodies will be compressed and stretched, driving the LED light board and the bonded Fresnel lens to rotate at a small angle in the backlight cavity, thereby flexibly changing the horizontal light output angle of the backlight.

3. The method for flexibly adjusting the light output angle of backlight according to claim 2, characterized in that: Slender holes are opened on both sides of the backlight cavity, and the diameter of the support column is larger than the width of the slender hole.

4. The method for flexibly adjusting the light output angle of backlight according to claim 2, characterized in that: The exterior of the backlight cavity is treated with a reflective treatment and then subjected to a layer of blackening and a light-isolating treatment by spraying paint.

5. The method for flexibly adjusting the light output angle of backlight according to claim 2, characterized in that: The ring shaft of the height adjustment slide block is sleeved on the support column to adjust the height up and down.

6. A structure for flexibly adjusting the light output angle of the backlight, including a backlight cavity, characterized in that: Support columns are arranged on both sides of the backlight cavity, and each group of the support columns is sleeved with a height adjustment slider; an LED light board is horizontally placed on the bottom surface of the backlight cavity, a Fresnel lens is horizontally arranged on the surface of the LED light board, and a transparent micro-lens array is arranged above the Fresnel lens; The two sets of height adjustment sliders are connected to the two ends of the transparent microlens array through transparent elastic bodies. When the two sets of height adjustment sliders slide up and down, they drive the transparent microlens array to rotate in the backlight cavity, thereby changing the horizontal light output angle of the backlight.

7. A method for flexibly adjusting the light output angle of a backlight, characterized in that: The following steps are involved: The LED light board is placed horizontally at the bottom of the backlight cavity, and a Fresnel lens is horizontally bonded to the LED light board with adhesive; The arrangement of LEDs on the light board, the tooth shape of each ring of the Fresnel lens, and the vertical bonding distance between the LED light board and the Fresnel lens are simulated and designed, so that the light emitted by the LED passes through the Fresnel lens and is emitted as parallel light; The two sets of height adjustment sliders and the transparent microlens array are connected by two transparent elastic bodies. When the two sets of height adjustment sliders slide up and down, the corresponding transparent elastic bodies will be compressed and stretched, driving the transparent microlens array to rotate at a small angle in the backlight cavity. According to the requirements of the environment, the horizontal light output angle of the backlight can be flexibly changed.

8. The method for flexibly adjusting the light output angle of backlight according to claim 7, characterized in that: Slender holes are opened on both sides of the backlight cavity, and the diameter of the support column is larger than the width of the slender hole.

9. The method for flexibly adjusting the light output angle of backlight according to claim 7, characterized in that: The exterior of the backlight cavity is treated with a reflective treatment and then subjected to a layer of blackening and a light-isolating treatment by spraying paint.

10. The method for flexibly adjusting the light output angle of backlight according to claim 7, characterized in that: The ring shaft of the height adjustment slide block is sleeved on the support column to adjust the height up and down.

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