CN113985648B - Large-area light source structure with laminated adjustable light-emitting areas - Google Patents

Large-area light source structure with laminated adjustable light-emitting areas Download PDF

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Publication number
CN113985648B
CN113985648B CN202111059657.1A CN202111059657A CN113985648B CN 113985648 B CN113985648 B CN 113985648B CN 202111059657 A CN202111059657 A CN 202111059657A CN 113985648 B CN113985648 B CN 113985648B
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light
light guide
light source
guide plate
channel
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CN202111059657.1A
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CN113985648A (en
Inventor
陈恩果
谢建龙
肖世杰
叶芸
徐胜
郭太良
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Fuzhou University
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Fuzhou University
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0073—Light emitting diode [LED]
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light

Abstract

The invention provides a large-area light source structure with laminated adjustable light emitting areas, which comprises a plurality of light emitting units sequentially arranged at the channels on the top surface of a backboard to form a light source array; one end of the channel is a dimming side, and the other end is a brightness enhancement side; the light-emitting unit is a plate-shaped object which can slide at the channel; the light output end of the light source array comprises a light emitting surface at the top of each light emitting unit; one side of the light-emitting unit is a sliding end which is arranged at the channel for sliding; in the direction of the light increasing side of the channel, the bottom surface of the light emitting unit is slidably arranged on the top surface of the next light emitting unit to form a light shielding surface; the sliding ends of the light-emitting units face the light-reducing side of the channel; when each light emitting unit of the light source array slides to the channel dimming side, the shading surface between the light emitting units is increased to reduce the light emission quantity, and when each light emitting unit slides to the channel dimming side, the shading surface between the light emitting units is reduced to increase the light emission quantity; the invention can solve the problems that the side-in backlight can not perform regional dynamic dimming and angle adjustment under the existing flat panel display technology.

Description

Large-area light source structure with laminated adjustable light-emitting areas
Technical Field
The invention relates to the technical field of light sources, in particular to a large-area light source structure with laminated adjustable light-emitting areas.
Background
Nowadays, the display technology is developed very rapidly, the flat panel display technology has become one of the most widely applied technologies in life nowadays, along with the development of the flat panel display technology, the demand for display products with better effects is also higher and higher, and the demand is also applicable to indoor and outdoor large-size display, such as commercial advertising, environmental atmosphere creation and the like. The large-size LED array display is adopted in most of the current indoor and outdoor large-size display screens, and the good display effect cannot be achieved under the limitation of power consumption and cost in terms of the current technical level. Because the liquid crystal has the characteristics of low voltage, micro power consumption, easy colorization, passive display and the like, compared with OLED, PDP, FED, the liquid crystal display has the advantages of most research, most mature technology, low power consumption, low cost, long service life and good display effect, and has the potential of substituting common LEDs to be indoor and outdoor large-size display. However, the liquid crystal panel (LCD) itself does not emit light, so a backlight module having a light emitting function is required. Meanwhile, in order to improve the display effect of the liquid crystal and realize high contrast and even HDR effect, the backlight module needs to have a dynamic area dimming function. Therefore, the low-cost dynamic area dimming backlight module has important significance for large-size liquid crystal display with high indoor and outdoor display effects.
The backlight module is divided into a side-in backlight and a direct-down backlight according to the incidence mode of the LED light source. The traditional LED direct type backlight can realize regional dimming, namely different backlight regions are respectively arranged, the luminous brightness of each LED is independently controlled according to a liquid crystal display image, and the regional brightness and darkness are independently adjusted; in the conventional side-entry type LED backlight, LED dies are disposed at the peripheral edges of a liquid crystal screen, and a light guide plate is disposed in the side-entry type LED backlight, so that when the LED backlight module emits light, the light emitted from the edges of the screen is transmitted to the central area of the screen through the light guide plate. However, in order to make the picture bright in color, the conventional LED direct type backlight needs thousands of LED dies, and the circuit and design cost thereof are not easy, and the power consumption of the whole display is particularly large, which is more unreasonable under large-size display. In the traditional side-entry type LED backlight, in the picture conversion process, the gray level is reduced in the area conversion to generate the phenomenon of blurring; the edge effect also causes poor uniformity of the brightness of the screen, i.e. the brightness of the edge part area is higher than that of the middle part area, so that the dynamic dimming of the area cannot be basically realized.
Disclosure of Invention
The invention provides a large-area light source structure with laminated adjustable light emitting areas, which can solve the problems that the side-in backlight cannot perform area dynamic dimming and angle adjustment under the existing flat panel display technology.
A large area light source structure of stacked tunable light emitting regions, the light source structure comprising a plurality of light emitting units (4) sequentially disposed at channels of a top surface of a back plate (1) to form a light source array (3); one end of the channel is a dimming side, and the other end of the channel is a brightness enhancement side; the light-emitting units are plate-shaped objects which are obliquely or vertically arranged and can slide at the channels (11); the light output end of the light source array comprises a light emitting surface at the top of each light emitting unit; one side of the light-emitting unit is a sliding end which is arranged at the channel for sliding; in the light increasing side direction of the channel, the bottom surface of the light emitting unit is slidably arranged on the top surface of the next light emitting unit to form a light shielding surface, so that the light emitting surface of the next light emitting unit is shielded; the sliding ends of the light-emitting units face the light-reducing side of the channel; when each light emitting unit of the light source array slides to the channel dimming side, the light shielding surface between each light emitting unit is increased to reduce the light emission amount, and when each light emitting unit slides to the channel dimming side, the light shielding surface between each light emitting unit is decreased to increase the light emission amount.
The light emitting unit comprises an LED light source (31), a light guide structure (41) of a light guide plate and a roller (33) arranged at the sliding end; the LED light source is arranged at a metal substrate (32) at the side edge of the light-emitting unit, and the light-emitting side of the LED light source is connected with the light guide plate; a light-transmitting diffusion layer (43) is attached to the light-emitting surface of the top of the light guide structure, and light reflection layers are attached to the side surfaces and the bottom surface of the light guide structure, so that the side surfaces and the bottom surface of the light guide structure are light-impermeable surfaces.
The light-reducing side of the channel is provided with a light shielding plate (5) with one side hinged with the backboard, the light shielding plate limits the sliding of each light-emitting unit in the channel, and the bottom surface of the light shielding plate is arranged on the top surface of the nearest light-emitting unit in a sliding manner to form a light shielding surface.
A push rod mechanism (2) capable of driving each light-emitting unit of the light source array to slide at the channel is arranged at the light-increasing side of the channel; when the inclination of the light shielding plate and the inclination of the light emitting units are increased to be perpendicular to the backboard, the light emitting surfaces of the light emitting units are all shielded, so that the working condition of the light source array is in a non-light emitting state.
The top surface of the backboard is a diffuse reflection surface, and when the inclination of each light-emitting unit is changed, the light-emitting angle of the light source array is changed.
The push rod mechanism drives each light-emitting unit of the light source array to slide at a channel through a telescopic support rod (23), the telescopic support rod is connected to the bottom surface of the nearest light-emitting unit through an upper support surface (21), the upper end of the telescopic support rod is hinged with the upper support surface through a movable pulley (22), and the lower end of the telescopic support rod is hinged to a lower support surface (25) through a lower movable pulley (24); the lower support surface is fixed at the light-intensifying side of the channel.
The channel at the back plate is adjacent to a lifting long lifter, and a limiting barrier (12) capable of limiting the roller of the light-emitting unit is arranged at the long lifter; when the telescopic support rod stops driving the light source array to slide, the limiting stopper of the strip lifter limits the rolling shafts of the light emitting units to fix the positions of the light emitting units; when the telescopic support rod drives each light-emitting unit of the light source array to slide, the limiting stopper of the strip lifter does not limit the rolling shafts of each light-emitting unit so that the light-emitting units can slide in the channels.
The metal substrate comprises a conductive structure for supplying power to the LED light source; the rolling shaft is arranged at the metal substrate; a plurality of LED light sources are arranged at the light guide plate;
the white light emergent working condition of the light source array can be realized by adopting any one of the following methods;
the method A uses a white light LED device as an LED light source to directly output white light;
and B, setting a red-green quantum dot structure at the light guide plate, using a blue light LED device as an LED light source, and exciting the red-green quantum dot structure by the blue light LED device to realize white light output.
A diffusion layer (43) attached to the light emitting surface at the top of the light guide structure of the light guide plate can regulate and control light rays of the light guide plate to be emitted in a lambertian cosine manner;
the bottom surface of the light guide structure of the light guide plate is provided with a lattice point array (42); the lattice point array consists of pits with light reflecting surfaces densely distributed at the bottom surface of the light guide plate; the bottom surface of the light guide plate close to the LED light source is low in pit density, and the bottom surface of the light guide plate far away from the LED light source is high in pit density.
The light source array comprises a plurality of LED light sources inclined at the same angle and light guide plates which are arranged and combined in a form of N x N, wherein N is the number of the light guide plates, namely the number of light source columns, N is the number of each row of light sources, namely the number of light source rows, the light emitting uniformity of the whole light source array can be optimized by increasing the value of N,
the column distance a of each light guide plate in the light source array is determined by the height L and the inclination angle theta of the light guide plate, wherein theta is more than or equal to theta 0 The specific formula is
When the light guide plates of all the light emitting units in the light source array slide to a state vertical to the bottom plate, the supporting rod forms a certain included angle alpha with the horizontal plane, the value of alpha is about 45 degrees, the supporting rod is made of a firm material, and the change range of the length X of the telescopic rod is limited as follows
In the light source array, in the direction parallel to the light emitting surface of the light guide plate, the total light emitting area of the light output end is determined according to the number n of the light guide plates, the inclination angle theta of the light guide plates, the length L1 of the light guide plates and the height L of the light guide plates, and the specific values are determined by the following formulas:
for a direction parallel to the bottom back plate, its total light exit area is defined by:
S′＝S*cosθ
the dimension of the light guide plate is length L1, width L2 and height L, the top surface of the backboard is a diffuse reflection surface capable of reflecting and utilizing light, and the dimension A of the backboard is defined by the dimension of the light guide plate and the minimum inclination angle theta 0 And the number n of the light guide plates, which hasThe volume value is determined by the following formula:
wherein the minimum tilt angle theta 0 Determined by the length L1 and the height L of the light guide plate,
the number of channels at the back plate is the same as the number of rollers of the light-emitting units;
the limiting barriers are arranged on each channel and are used for limiting the idler wheels of the light-emitting units, so that the inclination angle of the light guide plate can be limited to a fixed angle to meet the actual use requirement;
the limiting barrier is of a small sheet with concave arc-shaped two sides, the thickness of the limiting barrier is smaller than that of the channel, and the height of the limiting barrier is smaller than the radius of the rolling shaft;
the installation position x of the limiting barrier is determined according to the height L of the light guide plate, the inclination angle theta limited by the light guide plate and the number of stages N of the light guide plate, and a specific limiting formula is as follows:
wherein θ is 0 <θ<90°。
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the light-emitting area and the light-emitting angle are adjustable through the brightness of the light source array and the change of the inclination angle of the light guide plate, and the dimming operation under various conditions can be realized along with the limit number of the inclination angle and the difference of the brightness conditions.
The invention realizes large-area dynamic dimming by using a mechanical structure, and does not need a complex driving circuit, thereby saving cost.
Drawings
The invention is described in further detail below with reference to the attached drawings and detailed description:
FIG. 1 is a schematic view of the overall structure of the present invention at a minimum inclination angle;
FIG. 2 is a schematic diagram of the overall structure of the embodiment of the present invention when the upper surface of the light guide plate is half-shielded;
FIG. 3 is a schematic view showing the overall structure of the light guide plate according to the embodiment of the present invention when the light guide plate is slid to be perpendicular to the bottom plate;
FIG. 4a is a schematic side view of a light guide plate according to an embodiment of the present invention;
FIG. 4b is a schematic top view of a light guide plate according to an embodiment of the present invention;
FIG. 5 is a schematic top view of the overall structure of an embodiment of the present invention;
FIG. 6 is a schematic diagram showing the state of the limiting barrier in the case of movement of the light guide plate according to the embodiment of the present invention;
FIG. 7 is a schematic view showing a state of a limit stopper in a static state of a light guide plate according to an embodiment of the present invention;
FIG. 8 is a schematic mechanical diagram of an embodiment of the present invention;
FIG. 9 is a schematic diagram of simulation of a large-area light source structure with laminated adjustable light-emitting areas when the upper surface of the light guide plate is shaded for half (three dimming areas are fully lit) according to an embodiment of the present invention;
FIG. 10 is a schematic diagram of simulation of a large area light source structure with a layered adjustable light emitting area according to an embodiment of the present invention when the upper surface of the light guide plate is half-shielded (the middle dimming area is not bright);
in the figure: 1-a back plate; 2-a push rod mechanism; 3-an array of light sources; 4-a light emitting unit; 5-a light shielding plate;
11-channel 12-limit stops;
21-an upper support surface; 22-upper movable pulleys; 23-a telescopic support rod; 24-lower movable pulleys; 25-a lower support surface;
31-an LED light source; 32-a metal substrate; 33-rolling shafts;
41-a light guiding structure; 42-dot array; 43-diffusion layer.
Detailed Description
As shown in the figure, a large-area light source structure of laminated adjustable light emitting areas includes a plurality of light emitting units 4 sequentially disposed at channels of the top surface of a back plate 1 to form a light source array 3; one end of the channel is a dimming side, and the other end of the channel is a brightness enhancement side; the light-emitting units are plate-shaped objects which are obliquely or vertically arranged and can slide at the channel 11; the light output end of the light source array comprises a light emitting surface at the top of each light emitting unit; one side of the light-emitting unit is a sliding end which is arranged at the channel for sliding; in the light increasing side direction of the channel, the bottom surface of the light emitting unit is slidably arranged on the top surface of the next light emitting unit to form a light shielding surface, so that the light emitting surface of the next light emitting unit is shielded; the sliding ends of the light-emitting units face the light-reducing side of the channel; when each light emitting unit of the light source array slides to the channel dimming side, the light shielding surface between each light emitting unit is increased to reduce the light emission amount, and when each light emitting unit slides to the channel dimming side, the light shielding surface between each light emitting unit is decreased to increase the light emission amount.
The light emitting unit includes an LED light source 31, a light guide structure 41 of a light guide plate, and a roller 33 installed at a sliding end; the LED light source is arranged at the metal substrate 32 at the side edge of the light-emitting unit, and the light-emitting side of the LED light source is connected with the light guide plate; a light-transmitting diffusion layer 43 is attached to the light-emitting surface of the top of the light guide structure, and light reflection layers are attached to the side surfaces and the bottom surface of the light guide structure, so that the side surfaces and the bottom surface of the light guide structure are formed as light-impermeable surfaces.
The light-reducing side of the channel is provided with a light shielding plate 5, one side of the light shielding plate is hinged with the backboard, the light shielding plate limits the sliding of each light-emitting unit in the channel, and the bottom surface of the light shielding plate is arranged on the top surface of the nearest light-emitting unit in a sliding manner to form a light shielding surface.
The light increasing side of the channel is provided with a push rod mechanism 2 which can drive each light emitting unit of the light source array to slide at the channel; when the inclination of the light shielding plate and the inclination of the light emitting units are increased to be perpendicular to the backboard, the light emitting surfaces of the light emitting units are all shielded, so that the working condition of the light source array is in a non-light emitting state.
The top surface of the backboard is a diffuse reflection surface, and when the inclination of each light-emitting unit is changed, the light-emitting angle of the light source array is changed.
The push rod mechanism drives each light-emitting unit of the light source array to slide at a channel by a telescopic support rod 23, the telescopic support rod is connected to the bottom surface of the nearest light-emitting unit through an upper support surface 21, the upper end of the telescopic support rod is hinged with the upper support surface through a movable pulley 22, and the lower end of the telescopic support rod is hinged with a lower support surface 25 through a lower movable pulley 24; the lower support surface is fixed at the light-intensifying side of the channel.
The channel at the back plate is adjacent to a lifting long lifter, and a limiting barrier 12 capable of limiting the roller of the light-emitting unit is arranged at the long lifter; when the telescopic support rod stops driving the light source array to slide, the limiting stopper of the strip lifter limits the rolling shafts of the light emitting units to fix the positions of the light emitting units; when the telescopic support rod drives each light-emitting unit of the light source array to slide, the limiting stopper of the strip lifter does not limit the rolling shafts of each light-emitting unit so that the light-emitting units can slide in the channels.
The metal substrate comprises a conductive structure for supplying power to the LED light source; the rolling shaft is arranged at the metal substrate; a plurality of LED light sources are arranged at the light guide plate;
the white light emergent working condition of the light source array can be realized by adopting any one of the following methods;
the method A uses a white light LED device as an LED light source to directly output white light;
and B, setting a red-green quantum dot structure at the light guide plate, using a blue light LED device as an LED light source, and exciting the red-green quantum dot structure by the blue light LED device to realize white light output.
The diffusion layer 43 attached to the light emitting surface of the light guide structure of the light guide plate can regulate and control the light of the light guide plate to be emitted in a lambertian cosine manner;
the bottom surface of the light guide structure of the light guide plate is provided with a lattice point array 42; the lattice point array consists of pits with light reflecting surfaces densely distributed at the bottom surface of the light guide plate; the bottom surface of the light guide plate close to the LED light source is low in pit density, and the bottom surface of the light guide plate far away from the LED light source is high in pit density.
The light source array comprises a plurality of LED light sources inclined at the same angle and light guide plates which are arranged and combined in a form of N x N, wherein N is the number of the light guide plates, namely the number of light source columns, N is the number of each row of light sources, namely the number of light source rows, the light emitting uniformity of the whole light source array can be optimized by increasing the value of N,
the column distance a of each light guide plate in the light source array is determined by the height L and the inclination angle theta of the light guide plate, wherein theta is more than or equal to theta 0 The specific formula is
When the light guide plates of all the light emitting units in the light source array slide to a state vertical to the bottom plate, the supporting rod forms a certain included angle alpha with the horizontal plane, the value of alpha is about 45 degrees, the supporting rod is made of a firm material, and the change range of the length X of the telescopic rod is limited as follows
In the light source array, in the direction parallel to the light emitting surface of the light guide plate, the total light emitting area of the light output end is determined according to the number n of the light guide plates, the inclination angle theta of the light guide plates, the length L1 of the light guide plates and the height L of the light guide plates, and the specific values are determined by the following formulas:
for a direction parallel to the bottom back plate, its total light exit area is defined by:
S′＝S*cosθ
the dimension of the light guide plate is length L1, width L2 and height L, the top surface of the backboard is a diffuse reflection surface capable of reflecting and utilizing light, and the dimension A of the backboard is defined by the dimension of the light guide plate and the minimum inclination angle theta 0 And the number n of the light guide plates, the specific value of which is determined by the following formula:
wherein the minimum tilt angle theta 0 Determined by the length L1 and the height L of the light guide plate,
the number of channels at the back plate is the same as the number of rollers of the light-emitting units;
the limiting barriers are arranged on each channel and are used for limiting the idler wheels of the light-emitting units, so that the inclination angle of the light guide plate can be limited to a fixed angle to meet the actual use requirement;
the limiting barrier is of a small sheet with concave arc-shaped two sides, the thickness of the limiting barrier is smaller than that of the channel, and the height of the limiting barrier is smaller than the radius of the rolling shaft;
the installation position x of the limiting barrier is determined according to the height L of the light guide plate, the inclination angle theta limited by the light guide plate and the number of stages N of the light guide plate, and a specific limiting formula is as follows:
wherein θ is 0 <θ<90°。
Examples:
referring to fig. 1, the present invention provides a large-area light source structure with a stacked adjustable light emitting area, which includes a back plate 1, a mechanical structure 2 (push rod mechanism), a light source array 3, an inclined light guide plate 4 (light emitting unit) and a light shielding plate 5 sequentially arranged from bottom to top. The upper surface of the backboard 1 is provided with a channel for rolling a roller arranged on the light source array 3, the inclined light guide plate 4 and the light shielding plate 5 are forced through the mechanical structure 2, and the inclined angle is changed by combining with a limit barrier, so that the light emitting area and the light emitting angle are adjustable.
Preferably, the light shielding plate 5 is arranged at the leftmost end of the integral structure, the placement mode of the light shielding plate is consistent with that of the inclined light guide plate 4, and the lower left side of the light shielding plate is directly fixed on the backboard without a roller. The length and width of the light shielding plate 5 are consistent with those of the inclined light guide plate 4, and the thickness thereof can be adjusted according to circumstances. The material of the light shielding plate 5 is a reflective material, so that it can also become an upper plate of the dimming area, and when all the light guiding plates slide to a state perpendicular to the bottom plate, the light shielding plate reflects all the light, so that no light is transmitted, and the whole structure is in a completely black state.
Referring to fig. 4a and 4b, in the present embodiment, the light source array 3 includes a plurality of LED light sources 31, an aluminum substrate 32, and two rollers 33 symmetrical with respect to the center of the light guide plate. The inclined light guide plate 4 includes a light guide plate light guide structure 41, dots 42, and a diffusion film 43 (diffusion layer).
Preferably, in this embodiment, the light emitting side of the LED light source 31 is connected to the light guide plate, and the back surface of the LED light source is connected to the aluminum substrate 32 (metal substrate), so that the aluminum substrate 32 is electrified to light the LED light source 31 in the whole row, so as to realize the brightness of the corresponding light guide plate region.
Preferably, in this embodiment, the two rollers 33 symmetrical with respect to the center of the light guide plate are hole-punched and mounted on the aluminum substrate 32, and the specific positions thereof are determined by the corresponding channels. The roller in this embodiment is used to drive the inclined light guide plate to move, so that the inclined angle of the light guide plate changes, and the light emitting area and the light emitting angle are changed.
Preferably, in this embodiment, the light guiding structure 41 of the light guiding plate has reflective materials or reflective films attached to the front and rear surfaces, the far-light side surface and the lower surface thereof, and the lower surface is provided with dots 42, and the upper surface has a diffusion layer to regulate the light to be emitted as lambertian cosine, so that the light is more uniform in emitting.
Preferably, in order to ensure that the light emitted by the inclined light guide plate is more uniform, the concave dots are distributed more and more densely from the low beam source side to the high beam source side, and the arrangement of the LEDs in the same direction can be uniform or non-uniform, so that the light emitted by the light guide plate is more uniform.
Referring to fig. 6, in this embodiment, the back plate 1 includes a plurality of channels 11 and a limit stop 12. The number of channels 11 is determined by the number of inclined light guide plates, and the channels are arranged symmetrically with respect to the center of the light guide plates for rolling of rollers mounted on the light source array.
Preferably, in order to prevent the limit stopper 12 from damaging the roller, the roller is more convenient to move, the limit stopper is provided with the long-strip lifter, and the long-strip lifter can be lifted and lowered by external force application or not, so that the support rod is not limited when in force application, and is limited when not in force application, the roller can roll more conveniently, and damage to the roller is reduced.
Referring to fig. 8, in the present embodiment, the mechanical structure 2 includes an upper support surface 21, an upper movable sheave 22, a telescopic support rod 23, a lower movable sheave 24, and a lower support surface 25. Wherein the upper supporting surface 21 is fixed on the lower surface of the rightmost light guide plate, the lower supporting surface 25 is fixed on the starting point, the upper movable pulley 22 and the lower movable pulley 24 enable the upper supporting surface to better fit the inclined light guide plate, and the telescopic supporting rod 23 can be adjusted within a certain length range, so that the rightmost light guide plate is forced.
Example 1:
referring to fig. 1, the case of tilting the light guide plate by a minimum angle is described. In this embodiment, the dimming area is composed of two plates, one of which may be the light shielding plate 5. Thus, in this embodiment, there are three dimming areas in total, namely, a light shielding plate and a first light guide plate, a first light guide plate and a second light guide plate, a second light guide plate and a third light guide plate. The method for realizing the adjustable light area of the inclined light guide plate 4 comprises the following steps: first, the brightness of the LED light source 31 determines the brightness of the light guide plate area corresponding thereto; second, the size of the adjustable light area of each light guide plate is determined by two light guide plates which are stacked up and down, the lower surface of the upper light guide plate is used as a light shielding plate by a reflecting film, and the lower light guide plate is used as a light emitting plate, so that the light emitting area is controlled. With the action of the mechanical structure 2, the light source array 3 and the inclined light guide plate 4 move, the inclination angle changes, and as the inclination angle increases, the light shielding area is larger and the light emitting area also changes, so that the light area is adjustable. Third, the light scattered out of the light guide plate by the dots 42 follows the lambertian cosine distribution, and the light intensity emitted out of the light guide plate vertically is strongest, so that the light emitting angle is adjustable by changing the inclination angle of the light guide plate.
In this embodiment, the dimension of the upper surface of the back plate 1 is 398.93mm×100mm, and the upper surface is provided with a diffuse reflection surface for reflecting and utilizing downward light, so as to increase the light utilization rate thereof. And 6 channels 11 symmetrical relative to the center of the light guide plate are arranged, each inclined light guide plate corresponds to two channels, the lengths of the channels are consistent with the length of the backboard, and the width of the channels is determined by the roller 33.
In this embodiment, the LED light sources 31 have a size of 7mm by 2mm, and each inclined light guide plate 4 has 5 LED light sources distributed as a center, and symmetrically distributed at intervals of 20 mm. The LED light source emits light from a single side wall, and the height of the light emitting area is equal to or slightly smaller than that of the inclined light guide plate. The light emitting side of the LED light source is attached to the inclined light guide plate, and the back surface of the inclined light guide plate is fixed on the aluminum substrate 32, so that all LEDs connected with the aluminum substrate are fully lightened when the aluminum substrate is electrified, and the brightness of a region is realized.
Preferably, in this embodiment, the rollers 33 symmetrical with respect to the center of the light guide plate are installed by digging two holes in the aluminum substrate 32, and the specific positions thereof are determined by the corresponding channels. The roller in this embodiment is used to drive the inclined light guide plate to move, so that the inclined angle of the light guide plate changes, and the light emitting area and the light emitting angle are changed.
In this embodiment, the inclined light guide plate 4 has a size of 100mm x 10mm, and is made of transparent acrylic (PMMA), and the bottom surface, the front and rear sides, and the right side surfaces thereof are coated with white polyethylene terephthalate with high reflectivity, the left side surface thereof is connected to the light source array 3, the lower surface thereof is further provided with dots 42 for breaking the total reflection condition of the light, so that the light is transmitted out of the light guide plate, and the upper surface thereof is coated with a diffusion film 43 for making the light more uniform. Wherein, the minimum angle of the inclined light guide plate is 5.75 degrees.
Preferably, in order to ensure that the light emitted by the inclined light guide plate is more uniform, the concave dots are distributed more and more densely from the low beam source side to the high beam source side, and the arrangement of the LEDs in the same direction can be uniform or non-uniform, so that the light emitted by the light guide plate is more uniform.
Preferably, the white light emitting is realized mainly by the following steps: the first is to directly realize white light emission by using a white light LED; the second is to excite red and green quantum dots to emit white light by using a blue LED light source, and the red and green quantum dots are disposed at a certain structure of the light guide plate, including but not limited to a tube, a film, etc.
In this embodiment, the light shielding plate 5 is disposed at the leftmost end of the overall structure, and is disposed in the same manner as the inclined light guide plate 4, and is directly fixed on the back plate 1 without a roller disposed at the lower left thereof. The size of the light shielding plate 5 is set to 100mm by 10mm, and the thickness thereof may be changed according to circumstances. The lower surface of the light shielding plate 5 is coated with white polyethylene with high reflectivity material, so that the light shielding plate can also become an upper plate of a dimming area, and when all the inclined light guide plates 4 slide to be perpendicular to the bottom plate, all the light is reflected by the light shielding plate, so that no light is transmitted, and the whole structure is in a completely black state.
Referring to fig. 2, in the present embodiment, when the upper surface of the inclined light guide plate 4 is shielded from light by half, the inclination angle is 11.18 °.
Referring to fig. 3, in the present embodiment, when all the inclined light guide plates 4 are slid to a state perpendicular to the bottom plate, the light shielding plates reflect all the light, and thus no light is transmitted, resulting in the overall structure assuming a completely black state.
Referring to fig. 6, in the present embodiment, the limit stopper 12 is structurally configured such that a long lifter is installed under the limit stopper 12 to control the lifting of the limit stopper in order to prevent damage to the roller 33 or other accessories. When the mechanical structure applies force 2, the roller 33 starts to move, and the control chip sends a first signal to enable the strip lifter to descend, so that the limit stopper descends, and the movement of the roller is not limited by the limit stopper.
Referring to fig. 7, when the mechanical structure 2 is not applying a force, the control chip transmits a second signal to raise the long lifter, so that the limit stopper 12 is raised to limit the movement of the roller 33 and limit the light guide plate to a corresponding inclination angle. The inclination angle of the inclined light guide plate 4 can be limited differently, and the dimming area of different inclination angles can be different, so that the electrodeless dimming of the light guide plate can be realized.
Referring to fig. 8, in the present embodiment, the mechanical structure 2 is divided into an upper supporting surface 21, an upper movable pulley 22, a telescopic supporting rod 23, a lower movable pulley 24, and a lower supporting surface 25. Wherein the telescopic support bar 23 is in a vertical state at a minimum angle and in an inclined state in a vertical state of the light guide plate, and the length thereof ranges from 10mm to 382.9mm.
In this embodiment, in order to verify the light emitting uniformity and the area dimming effect of the embodiment of the present invention, the optical simulation software Tracepro performs light ray tracing on a large-area light source structure with laminated adjustable light emitting areas, when the upper surface of the light guide plate is shaded for half, as shown in fig. 9, when the three dimming areas are all bright, the simulation result shows that the light emitting effect of the large-area light source structure with laminated adjustable light emitting areas is better.
Further, as shown in fig. 10, when the upper surface of the light guide plate is half-shielded, the left and right dimming areas are bright, and the middle dimming area is not bright, and as a result of simulation, the area dimming effect of the large-area light source structure in which the adjustable light emitting areas are laminated is also good.
The foregoing description is only of the preferred embodiments of the invention, and all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims (8)

1. A large area light source structure of stacked adjustable light emitting areas, characterized in that: the light source structure comprises a plurality of light emitting units (4) which are sequentially arranged at the channel of the top surface of the backboard (1) to form a light source array (3); one end of the channel is a dimming side, and the other end of the channel is a brightness enhancement side; the light-emitting units are plate-shaped objects which are obliquely or vertically arranged and can slide at the channels; the light output end of the light source array comprises a light emitting surface at the top of each light emitting unit; one side of the light-emitting unit is a sliding end which is arranged at the channel for sliding; in the light increasing side direction of the channel, the bottom surface of the light emitting unit is slidably arranged on the top surface of the next light emitting unit to form a light shielding surface, so that the light emitting surface of the next light emitting unit is shielded; the sliding ends of the light-emitting units face the light-reducing side of the channel; when each light emitting unit of the light source array slides to the channel dimming side, the shading surface between the light emitting units is increased to reduce the light emission quantity, and when each light emitting unit slides to the channel dimming side, the shading surface between the light emitting units is reduced to increase the light emission quantity;
a light shielding plate (5) with one side hinged with the backboard is arranged at the light-reducing side of the channel, the light shielding plate limits the sliding of each light-emitting unit in the channel, and the bottom surface of the light shielding plate is arranged at the top surface of the nearest light-emitting unit in a sliding manner to form a light shielding surface;
a push rod mechanism (2) capable of driving each light-emitting unit of the light source array to slide at the channel is arranged at the light-increasing side of the channel; when the inclination of the light shielding plate and the inclination of the light emitting units are increased to be perpendicular to the backboard, the light emitting surfaces of the light emitting units are all shielded, so that the working condition of the light source array is in a non-light emitting state.
2. A large area light source structure of stacked tunable light emitting areas as defined in claim 1, wherein: the light emitting unit comprises an LED light source (31), a light guide structure (41) of a light guide plate and a roller (33) arranged at the sliding end; the LED light source is arranged at a metal substrate (32) at the side edge of the light-emitting unit, and the light-emitting side of the LED light source is connected with the light guide plate; a light-transmitting diffusion layer (43) is attached to the light-emitting surface of the top of the light guide structure, and light reflection layers are attached to the side surfaces and the bottom surface of the light guide structure, so that the side surfaces and the bottom surface of the light guide structure are light-impermeable surfaces.
3. A large area light source structure of stacked tunable light emitting areas as defined in claim 1, wherein: the top surface of the backboard is a diffuse reflection surface, and when the inclination of each light-emitting unit is changed, the light-emitting angle of the light source array is changed.
4. A large area light source structure of stacked tunable light emitting areas as defined in claim 1, wherein: the push rod mechanism drives each light-emitting unit of the light source array to slide at a channel through a telescopic support rod (23), the telescopic support rod is connected to the bottom surface of the nearest light-emitting unit through an upper support surface (21), the upper end of the telescopic support rod is hinged with the upper support surface through a movable pulley (22), and the lower end of the telescopic support rod is hinged to a lower support surface (25) through a lower movable pulley (24); the lower support surface is fixed at the light-intensifying side of the channel.
5. A large area light source structure of stacked tunable light emitting areas as defined in claim 1, wherein: the channel at the back plate is adjacent to a lifting long lifter, and a limiting barrier (12) capable of limiting the roller of the light-emitting unit is arranged at the long lifter; when the telescopic support rod stops driving the light source array to slide, the limiting stopper of the strip lifter limits the rolling shafts of the light emitting units to fix the positions of the light emitting units; when the telescopic support rod drives each light-emitting unit of the light source array to slide, the limiting stopper of the strip lifter does not limit the rolling shafts of each light-emitting unit so that the light-emitting units can slide in the channels.
6. A large area light source structure of stacked tunable light emitting areas as defined in claim 2, wherein: the metal substrate comprises a conductive structure for supplying power to the LED light source; the rolling shaft is arranged at the metal substrate; a plurality of LED light sources are arranged at the light guide plate;
the white light emergent working condition of the light source array can be realized by adopting any one of the following methods;
the method A uses a white light LED device as an LED light source to directly output white light;
and B, setting a red-green quantum dot structure at the light guide plate, using a blue light LED device as an LED light source, and exciting the red-green quantum dot structure by the blue light LED device to realize white light output.
7. A large area light source structure of stacked tunable light emitting areas as defined in claim 2, wherein: the diffusion layer attached to the light emitting surface at the top of the light guide structure of the light guide plate can regulate and control light rays of the light guide plate to be emitted in a lambertian cosine mode;
the bottom surface of the light guide structure of the light guide plate is provided with a lattice point array (42); the lattice point array consists of pits with light reflecting surfaces densely distributed at the bottom surface of the light guide plate; the bottom surface of the light guide plate close to the LED light source is low in pit density, and the bottom surface of the light guide plate far away from the LED light source is high in pit density.
8. A large area light source structure of stacked tunable light emitting areas as defined in claim 5, wherein: the light source array comprises a plurality of LED light sources inclined at the same angle and light guide plates which are arranged and combined in an N x N mode, wherein N is the number of the light guide plates, namely the number of light source columns, N is the number of each row of light sources, namely the number of light source rows, the light emitting uniformity of the whole light source array can be optimized by increasing the value of N, the column distance a of each light guide plate in the light source array is determined by the height L of the light guide plates and the inclination angle theta, and the minimum inclination angle theta is determined by the height L of the light guide plates 0 Is determined by the length L1 and the height L of the light guide plate; wherein θ is greater than or equal to θ 0 The specific formula is
When the light guide plates of all the light emitting units in the light source array slide to a state vertical to the bottom plate, the supporting rod has a certain included angle alpha with the horizontal plane, the value of alpha is 45 degrees, the supporting rod is made of a firm material, and the change range of the length X of the telescopic rod is limited as follows
In the light source array, in the direction parallel to the light emitting surface of the light guide plate, the total light emitting area of the light output end is determined according to the number n of the light guide plates, the inclination angle theta of the light guide plates, the length L1 of the light guide plates and the height L of the light guide plates, and the specific values are determined by the following formulas:
for a direction parallel to the bottom back plate, its total light exit area is defined by:
S′＝S*cosθ
the dimension of the light guide plate is length L1, width L2 and height L, the top surface of the backboard is a diffuse reflection surface capable of reflecting and utilizing light, and the dimension A of the backboard is defined by the dimension of the light guide plate and the minimum inclination angle theta 0 And the number n of the light guide plates, the specific value of which is determined by the following formula:
wherein the minimum tilt angle theta 0 Determined by the length L1 and the height L of the light guide plate,
the number of channels at the back plate is the same as the number of rollers of the light-emitting units;
the limiting barriers are arranged on each channel and are used for limiting the idler wheels of the light-emitting units, so that the inclination angle of the light guide plate can be limited to a fixed angle to meet the actual use requirement;
the limiting barrier is of a small sheet with concave arc-shaped two sides, the thickness of the limiting barrier is smaller than that of the channel, and the height of the limiting barrier is smaller than the radius of the rolling shaft;
the installation position x of the limiting barrier is determined according to the height L of the light guide plate, the inclination angle theta limited by the light guide plate and the number of stages N of the light guide plate, and a specific limiting formula is as follows:
wherein θ is 0 <θ<90°。
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Publication number Priority date Publication date Assignee Title
JP2010170898A (en) * 2009-01-23 2010-08-05 Videocon Global Ltd Edge light type partial drive backlight unit and liquid crystal display
CN105828581A (en) * 2016-05-18 2016-08-03 东莞市闻誉实业有限公司 Cooling support device
CN111965899A (en) * 2020-09-09 2020-11-20 谷麦光电科技股份有限公司 Combined type backlight structure of vehicle-mounted display screen
CN112415808A (en) * 2020-11-11 2021-02-26 福州大学 Two-dimensional regional light-dimming light guide plate with embedded Mini-LED light source
CN212623479U (en) * 2020-08-13 2021-02-26 湖北弘汉精密光学科技有限公司 Distance-controllable lateral-entering type LED backlight module

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010170898A (en) * 2009-01-23 2010-08-05 Videocon Global Ltd Edge light type partial drive backlight unit and liquid crystal display
CN105828581A (en) * 2016-05-18 2016-08-03 东莞市闻誉实业有限公司 Cooling support device
CN212623479U (en) * 2020-08-13 2021-02-26 湖北弘汉精密光学科技有限公司 Distance-controllable lateral-entering type LED backlight module
CN111965899A (en) * 2020-09-09 2020-11-20 谷麦光电科技股份有限公司 Combined type backlight structure of vehicle-mounted display screen
CN112415808A (en) * 2020-11-11 2021-02-26 福州大学 Two-dimensional regional light-dimming light guide plate with embedded Mini-LED light source

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