CN210323448U - Array side embedded lens type light guide plate backlight coupling device and display device - Google Patents
Array side embedded lens type light guide plate backlight coupling device and display device Download PDFInfo
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- CN210323448U CN210323448U CN201920647391.4U CN201920647391U CN210323448U CN 210323448 U CN210323448 U CN 210323448U CN 201920647391 U CN201920647391 U CN 201920647391U CN 210323448 U CN210323448 U CN 210323448U
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Abstract
The utility model relates to a laser display and illumination field, in particular to array side embedding lens formula light guide plate coupling device and display device in a poor light. The utility model provides an array side embedding lens formula light guide plate coupling device in a poor light, including excitation pointolite (101), light guide plate (802) and line laser forming control element (201), the light that excitation pointolite (101) sent is converted into the line light source through line laser forming control element (201) and is entered into light guide plate, its characterized in that: the linear laser forming control elements (201) are embedded in the incident end of the light guide plate (802) and correspond to the intense point light sources (101) one by one. The utility model provides the high distribution uniformity of incident light with reduce because the space light loss of incident light formation when the distance between lens and light guide plate, further improved the coupling efficiency between incident light and the light guide plate, improved the luminance of emergent light, reduce the overall cost of display.
Description
Technical Field
The utility model relates to a laser display and illumination field, in particular to array side embedding lens formula light guide plate coupling device and display device in a poor light.
Background
The light guide plate is a core component in the manufacture of modern backlight displays, and the main purpose of the light guide plate is to shape incident light beams and convert the incident light beams into emergent light beams, so that the light guide plate is a light beam shaping and optical coupling device in principle. The optical coupling efficiency depends entirely on the optical structure design of the device. High optical coupling efficiency is a constantly sought goal in the fabrication of optical backlit displays to improve the optical quality of the display, including luminance and color gamut. The light guide plate optical coupling device comprises two parts, namely a light source and a light guide plate, wherein the light source can be an LED or a laser. The LED has the characteristic of low cost, but the brightness is not enough, and because the LED light source is a broad-spectrum light source, the color gamut of a display taking the LED light source as a light source is lower; in contrast, lasers have a high brightness, narrow bandwidth and thus a great potential, and as technology develops and new technology develops, the cost of quality lasers is gradually reduced. Whether it is an LED or a semiconductor laser light source, since the size of its emergent light spot is in the millimeter level, it still has a small size relative to a display several tens to hundreds of centimeters wide, and thus can be approximated as a point light source. The light guide plate is used to change point light source into uniform area light source and combine other optical gain and liquid crystal display module to make display. In order to meet the final requirement of the brightness of the display, the display generally adopts an array design form of a plurality of LEDs or a plurality of lasers, because the LEDs and the lasers both belong to point light sources, and the LEDs or the lasers are arranged on an incident interface of the light guide plate, uneven light spot shadows are often formed at the light source incident end of the light guide plate, which will influence the optical distribution of the incident light source in the light guide plate, thereby influencing the uniformity of emergent light, and finally influencing the uniformity of the display. In order to reduce the non-uniform light energy distribution formed by arranging the point light source array at the incident end of the light guide plate in a shadow manner, a general method is to change the point light source into a linear light source, namely, the point light source is converted into a linear light source through a word line lens or a Baville lens, so that the uniformity of incident light is improved. The larger the width of the point light source changed into the linear light source through the linear lens is, the higher the uniformity of the total linear light source formed by the linear light sources is, and the higher the light-emitting uniformity of the formed surface light source is, the higher the display uniformity of the display is. According to the imaging principle of a line lens or a Powell lens, in order to increase the length of the formed line light, the lens needs to be installed at a certain distance from the light guide plate, and a part of light is diffused into the air in the space to form light leakage, that is, a part of light emitted from the lens leaks into the atmosphere and is not fully utilized. If the ratio of these light leaks is high, the resulting loss of light will be large, which will affect the cost of the whole display.
The utility model discloses arrange the light-emitting heterogeneity that the facula shadow that probably forms at light guide plate incident end arouses and because the space light loss that distance between lens and the light guide plate formed not enough and propose to above a plurality of point light sources promptly, the purpose is exactly in order to improve light-emitting homogeneity and improve whole display system's optical coupling efficiency to reduce system cost.
Disclosure of Invention
1. The technical problem to be solved is as follows:
the light source is arranged at the incident end of the light guide plate, and the light emitting uniformity caused by the possible light spot shadow formed by the arrangement of the point light sources and the spatial scattering light loss formed when the emergent light of the lens passes through the distance between the lens and the light guide plate are formed.
2. The technical scheme is as follows:
in order to solve the above problem, the utility model provides an array side embedding lens formula light guide plate coupling device in a poor light, including encouraging pointolite 101, light guide plate 802 and line laser forming control element 201, the light that the excitation pointolite 101 sent passes through line laser forming control element 201 and converts the line light source into and enters into the light guide plate, line laser forming control element 201 imbed inside the light guide plate 802 incident end, with fierce pointolite 101 one-to-one.
The line laser forming control element 201 is a line lens or a Powell lens.
The line laser forming control element 201 is connected with the light guide plate by a quick adhesive.
The surface of the line laser forming control element 201 is plated with an anti-reflection film.
The line laser forming control element 201 is installed in pairs of double long sides or double short sides or four sides.
The linear laser forming control elements 201 are arranged in an array, and the excitation point light sources 101 are arranged in an array.
The material of the line lens or the Bawell lens is glass or an anti-aging organic material.
The excitation point light source 101 is a blue laser light source, the wavelength range of the blue laser light source is 450nm-455nm, and the power is more than 1.5 watts.
The blue laser light source is composed of semiconductor lasers, and each light source in the blue laser light source is connected with a heat sink heat dissipation diversion trench.
The utility model also provides a display device, include array side embedding lens formula light guide plate coupling device in a poor light, coupling device's bottom be reflection diaphragm 801, upper portion is light guide plate 802 in proper order, quantum dot membrane 803, increment membrane 804 and liquid crystal control board 805.
3. Has the advantages that:
the utility model provides the high distribution uniformity of incident light with reduce because the space light loss that lens incident light formed when the distance between lens and light guide plate under the condition outside the light guide plate further improved the coupling efficiency between incident light and the light guide plate, improved the luminance of emergent light, reduce the overall cost of display.
Drawings
Fig. 1 is a top view of the backlight structure of the present invention with a double-long-edge incident line lens or powell lens array side embedded in the light guide plate.
FIG. 2 is a side view of a general structure of a backlight display system with dual long edge incident word line lenses or Baville lens array side embedded light guide plates.
FIG. 3 is a side-embedded wedge-shaped light guide plate backlight structure of a single-edge-incident one-line lens or Baville lens array.
FIG. 4 is a dual long edge incident-to-word line lens or Powell lens array side embedded light guide plate backlight structure.
FIG. 5 is a double short edge incident-to-word line lens or Powell lens array side embedded light guide plate backlight structure.
FIG. 6 is a schematic diagram of a quad-lens array side-embedded lightguide backlight structure.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
The utility model provides an array side embedding lens formula light guide plate coupling device in a poor light, including excitation pointolite 101, light guide plate 802 and line laser forming control element 201, the light that excitation pointolite 101 sent is converted into the line light source through line laser forming control element 201 and enters into the light guide plate, line laser forming control element 201 embedding light guide plate 802 incident end inside, with violent pointolite 101 one-to-one.
The line laser forming control member 201 is embedded inside the incident end of the light guide plate 802 so that all the light emitted from the line laser forming control member 201 falls inside the light guide plate 802 at the same time, thus completely eliminating the spatial light loss due to the distance between the lens and the light guide plate.
The present invention uses an array excitation point light source 101 for better controlling the brightness and power consumption of the laser. The required power of a single laser is determined by the total light guide efficiency of the light guide plate and the optical film set thereof, and too low to achieve the high brightness required for effective display, too high is not only a waste of resources, but also unnecessary light pollution is likely to be generated, which increases the complexity of the system and the cost of the system. For the coupling efficiency who improves laser module to the light guide plate, the utility model discloses an embedded lens group's of array concept for the highlight laser can become line laser through a set of embedded lens of array, the leading-in light guide plate more effectively. In order to reduce the beam width of the line laser, the present invention adopts a line lens or a powell lens structure. A word line lens or a Powell lens can effectively reduce the width of an emergent beam by controlling the spread angle of emergent light. The closer the width of the outgoing beam is to the etendue of the light guide plate, the more efficient the coupling of the two systems. Because all the lenses are positioned in the light guide plate, the scattering loss formed by the space distance between the incident light and the light guide plate through the word line lens or the Bowell lens is reduced to the minimum, the light coupling efficiency of the line laser and the light guide plate is further improved, and the total cost of the display system is effectively reduced.
The axial azimuth angle of the word line lens or the Bowell lens can be manually adjusted in advance through the lens axial adjusting component; the positions of the word line lens or the Bawell lens and the intense point light source 101 can be finely adjusted within the range of 0-several millimeters, and the distance between the word line lens or the Bawell lens and the blue laser light source is adjusted through the light source fixing frame; the embedded word line lens or the Bawell lens has zero penetration distance at the incident end of the light guide plate, and the surface of the lens is plated with an anti-reflection film; the thickness of a word line lens or a Powell lens is adjustable, and the thickness requirement is determined by the quality requirement of a line light spot formed by a point light source through the lens; the length of the word line lens or the Bowell lens is adjustable when the word line lens or the Bowell lens extends into the light guide plate, and is determined by the quality of a line light spot formed by the point light source through the lens; a word line lens or Powell lens can be positioned in the thicker end of the wedge-shaped light guide plate and also can be positioned on the 4 surfaces of the flat-plate-type light guide plate; the embedded optical design consisting of a wordline lens or powell lens can be mounted with the double long sides in pairs, the double short sides in pairs, or the four sides in pairs, the required number being determined by the final display luminance and cost.
Through the array side embedded lens type light guide plate backlight coupling device, the propagation path of light is as follows: light emitted from the point laser light source is converted into linear laser through the embedded word line lens or the Baowell lens, enters the light guide plate 802, and is scattered and reflected for multiple times in the light guide plate 802 to form surface light source emission on the upper surface of the light guide plate.
The line laser has a spread angle of 90 to 120 degrees, the size of the spread angle is determined by the design parameters of the lens, and the final length requirement is determined by the required light intensity of the light guide plate and the coupling efficiency of the light guide plate. The utility model discloses a final objective is in order to reduce the space light loss because the space between lens and the light guide plate forms, consequently the utility model discloses a laser instrument and embedded lens terminal distance as far as possible little, its scope is between 0 to 2 millimeters. The reduced distance between the laser and the lens reduces the space light loss formed by the distance between the laser and the lens, and the embedded lens ensures that all light passing through the lens falls into the light guide plate, so that the space light loss formed by the distance between the lens and the light guide plate is reduced to zero. Therefore, the size of the system can be reduced, the light coupling efficiency between the light source and the light guide plate can be improved, and the system cost is reduced fundamentally.
Preferably, the excitation point light source 101 is a blue laser light source, wherein the blue laser light source is composed of a semiconductor laser, the wavelength range of the blue laser light source is 450nm-455nm, and the power is greater than 1.5 watts. For reducing the produced heat of the long-time luminescence of laser instrument, the utility model discloses an excitation pointolite has special design's cooling system, cooling system is for having ordinary heat sink heat dissipation guiding gutter. Each light source in the blue laser light sources is connected with a heat sink heat dissipation diversion trench. When the power of the laser light source is more than 1.5 watts, the laser light source is a high-power laser light source, and the danger level is 4 levels.
In order to reduce the cost, the word line lens or the Baowell lens array is processed outside a light guide plate in advance and then is embedded into the incident end of the light guide plate; the space of the light guide plate needed by the word line lens or the Bawell lens is processed by laser, and the binding between the word line lens or the Bawell lens and the light guide plate is finished by fast adhesive.
As shown in fig. 2, the present invention further provides a display device, which comprises the array side embedded lens type light guide plate backlight coupling device, wherein the bottom of the coupling device is a reflective membrane 801, and the upper portion is a light guide plate 802, a quantum dot film 803, an incremental film 804 and a liquid crystal control plate 805 in sequence. The propagation path of light is: blue laser emitted by a laser firstly passes through a linear laser or a Bowell lens to form linear laser, then sequentially passes through beam shaping of a light guide plate to form a uniform surface light source to be emitted from the upper surface of the light guide plate, then passes through a quantum dot film to form required white light, then passes through a light intensifying process of an incremental film, finally passes through a liquid crystal panel, forms a visible image signal under the control of a liquid crystal panel circuit, and finally completes display. To reduce possible losses due to possible penetration around the light guide plate, the respective surfaces are coated with reflection increasing films.
Example 1
The double long-edge incident word line lens or the Baowell lens array side is embedded into the light guide plate backlight structure.
As shown in fig. 1 and fig. 2, the blue light of the array laser 101 passes through a wordline lens or powell lens 201 and becomes narrow line laser, and the number of the array lasers is arranged according to the following principle: the line laser beams shaped by the lens are sequentially connected in the light guide plate 802, so that the line laser beams formed in the way are not overlapped, uniform lines are formed on the contact interface of the whole light guide plate, and finally uniform surface light source emission is formed on the upper surface of the light guide plate through scattering and reflection of the scattering point structure at the bottom around the inside of the light guide plate, and display is formed through control of the liquid crystal panel on the light guide plate. The arrangement density of the lasers is subject to the requirement of the brightness of the output light of the final surface light source.
The design arrangement of the embedded lens 201 and the laser 101 and lens almost adjacent thereto is evident from fig. 2. The purpose of the embedded lens design is, as mentioned above, to reduce the optical loss due to the spatial distance of the lens from the light guide plate, while the nearly touching laser-lens design also reduces the optical loss due to the gap between the laser and the lens.
Example 2
The side of the single-edge incidence word line lens or the Baowell lens array is embedded into the wedge-shaped light guide plate backlight structure.
The reason for the single-sided illumination is mainly to simplify the system design, as shown in fig. 3, which is a design of a system with not very high brightness requirements. The wedge-shaped light guide plate is designed to improve the uniformity of light output from the upper surface of the light guide plate. When the linear laser formed by a linear or Bawell lens enters the light guide plate, the intensity of light is weakened because light is continuously emitted from the upper surface along with the increase of the distance away from the light source. In addition, the design density of the scattering dots at the bottom of the light guide plate is also changed, and generally, the farther away from the light source, the higher the density of the scattering dots.
Example 3
The double long-edge incident word line lens or the Baowell lens array side is embedded into the light guide plate backlight structure.
As shown in fig. 4, the array laser module is incident from both left and right sides of the light guide plate, and includes a symmetrical laser light source module not shown and a powell lens coupling part. In order to maintain the uniformity of the emergent light on the upper surface of the light guide plate, the design of the scattering dots at the bottom of the flat light guide plate follows the additional design characteristic that the scattering dots at the central line part of the light guide plate parallel to the line formed by the lens array have higher density and are symmetrically structured.
Example 4
The double short sides are incident into a word line lens or Baowell lens array side and embedded into the light guide plate backlight structure.
As shown in fig. 5, the design structure of the light guide plate corresponding to the double long-side light guide is different from that of the double short-side light guide, so that the complexity of the system can be reduced, and the application target is also the case where the requirement for display brightness is low. The cost of the system is also reduced due to the reduced number of lasers and lenses required for the short edge design. The density of scattering points on the bottom surface of the light guide plate is modified accordingly.
Example 5
The side of the four-edge incident word line lens or the Baowell lens array is embedded into the light guide plate backlight structure.
As shown in fig. 6, this four-sided incident condition is adopted to improve the overall display brightness, unlike the double-long-side, double-short-side and wedge-shaped light guide plate designs.
The utility model discloses the extensible is applied to square light guide plate diagonal department side embedding lens formula light guide plate backlight coupling device, also can be applied to circular and irregular figure light guide plate design in a poor light.
The utility model discloses especially can expand and be applied to one-dimensional and multidimension line type laser array design, also can extend the multidimension design for stratiform light guide plate.
The utility model discloses can also expand the design in a poor light of being applied to annular and spherical light guide plate.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.
Claims (10)
1. An array side embedded lens type light guide plate backlight coupling device, comprising an excitation point light source (101), a light guide plate (802) and a line laser forming control element (201), wherein the light emitted by the excitation point light source (101) is converted into a line light source through the line laser forming control element (201) and enters the light guide plate, characterized in that: the linear laser forming control elements (201) are embedded in the incident end of the light guide plate (802) and correspond to the excitation point light sources (101) one by one.
2. The array-side embedded lens light guide plate backlight coupling device of claim 1, wherein: the line laser forming control element (201) is a line lens or a Powell lens.
3. The array-side embedded lens light guide plate backlight coupling device of claim 1 or 2, wherein: the line laser forming control element (201) is connected with the light guide plate through quick adhesion.
4. The array-side embedded lens light guide plate backlight coupling device of claim 1 or 2, wherein: and the surface of the line laser forming control element (201) is plated with an anti-reflection film.
5. The array-side embedded lens light guide plate backlight coupling device of claim 1 or 2, wherein: the line laser forming control elements (201) are arranged in pairs with double long sides or arranged in pairs with double short sides or arranged in pairs with four sides.
6. The array-side embedded lens light guide plate backlight coupling device of claim 1 or 2, wherein; the linear laser forming control elements (201) are arranged in an array form, and the excitation point light sources (101) are arranged in a display form.
7. The array-side embedded lens light guide plate backlight coupling device of claim 2, wherein; the material of the line lens or the Bawell lens is glass or an anti-aging organic material.
8. The array-side embedded lens light guide plate backlight coupling device of claim 6, wherein: the excitation point light source (101) is a blue laser light source, the wavelength range of the blue laser light source is 450nm-455nm, and the power is more than 1.5 watts.
9. The array-side embedded lens light guide plate backlight coupling device of claim 8; the blue laser light source is composed of semiconductor lasers, and each light source in the blue laser light source is connected with a heat sink heat dissipation diversion trench.
10. A display device, characterized in that: a backlight coupling device comprising an array side embedded lens type light guide plate according to any one of claims 1 to 9, wherein the bottom of the coupling device is a reflective film (801), and the upper part of the coupling device is a quantum dot film (803), an incremental film (804) and a liquid crystal control plate (805) in sequence.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920647391.4U CN210323448U (en) | 2019-05-08 | 2019-05-08 | Array side embedded lens type light guide plate backlight coupling device and display device |
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| CN201920647391.4U CN210323448U (en) | 2019-05-08 | 2019-05-08 | Array side embedded lens type light guide plate backlight coupling device and display device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110221378A (en) * | 2019-05-08 | 2019-09-10 | 南京第五十五所技术开发有限公司 | A kind of array side insertion lens type light guide plate backlight coupling device and display device |
| CN111538116A (en) * | 2020-05-15 | 2020-08-14 | 惠州迈特光电科技有限公司 | Self-diffusion light guide plate and manufacturing process thereof |
-
2019
- 2019-05-08 CN CN201920647391.4U patent/CN210323448U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110221378A (en) * | 2019-05-08 | 2019-09-10 | 南京第五十五所技术开发有限公司 | A kind of array side insertion lens type light guide plate backlight coupling device and display device |
| CN111538116A (en) * | 2020-05-15 | 2020-08-14 | 惠州迈特光电科技有限公司 | Self-diffusion light guide plate and manufacturing process thereof |
| CN111538116B (en) * | 2020-05-15 | 2022-08-30 | 上海精见新材料有限公司 | Self-diffusion light guide plate and manufacturing process thereof |
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