CN216118304U

CN216118304U - Side-entering type laser backlight color-combination shimming device for laser display

Info

Publication number: CN216118304U
Application number: CN202121472065.8U
Authority: CN
Inventors: 许江珂; 许江临
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-06-30
Filing date: 2021-06-30
Publication date: 2022-03-22
Anticipated expiration: 2031-06-30

Abstract

The utility model discloses a side-entering type laser backlight source color combination and shimming device for laser display, which is of a planar structure, wherein the side surface of the color combination and shimming device is formed by surrounding a plurality of reflecting surfaces and a transmitting surface, the transmitting surface is a single transmitting surface or a combined surface with transmitting and reflecting functions, at least one conical reflecting surface is arranged inside the color combination and shimming device, the central axis of the conical reflecting surface is mutually vertical to the upper surface and the lower surface of the color combination and shimming device, and laser beams incident from the outside are reflected for multiple times by the reflecting surfaces and the transmitting surfaces to finally realize color combination and shimming. The utility model can solve the problems of laser beam expansion, light field energy homogenization, color combination and improvement of the utilization rate of the laser light source by using one device, so that the laser light source can be used for backlight illumination of the liquid crystal display.

Description

Side-entering type laser backlight color-combination shimming device for laser display

Technical Field

The utility model relates to a color combination and shimming device of a laser backlight source, in particular to a side-entry type color combination and shimming device of the laser backlight source for laser display.

Background

The three primary color laser is the optimal display illumination source available to humans. The laser light source has the advantages of capability of realizing the recognizable color gamut of human eyes covering over 75.8 percent, extremely narrow spectral width and capability of realizing non-overlapping high-digital color coding, so that laser display is a recognized fourth-generation technology.

However, laser light differs from LED and OLED in that the light spatial divergence angle of OLED and LED is extremely large and the light spatial divergence angle of laser light is extremely small. And the OLED and the LED are isotropic lambertian body luminous sources or approximate lambertian body luminous sources, have no space directivity, and can be used as light sources of display products only by carrying out light condensation.

The laser diode is an anisotropic Gaussian light source, has strong spatial directivity and extremely small divergence angle, and can be used as an illumination light source of a display product only by expanding beams. And the tricolor laser display can obtain excellent display pictures only by solving the problems of laser color combination and shimming.

The existing shimming technology, such as CN105765292A, (the same patents CN201510381666, US20120162966a1, US20110286200a1, US20140043853a1, US20190221719a1, WO2017156902a1, CN201610158034) places the conical reflecting surface in the through hole of the light guide plate, and performs beam shaping or light combination on the LEDs to obtain a more uniform LED surface light source; in the scheme, one surface of the conical reflecting surface needs to be shielded or the double conical surfaces need to be subjected to beam adjustment to prevent uneven light energy distribution. However, for the laser diode, laser speckle noise interference generated by laser directly irradiating the liquid crystal display screen influences meeting surface quality, but shielding the conical reflecting surface influences the overall brightness of the light guide plate, and the shimming purpose cannot be achieved; the two most important points are: due to strong laser directivity and small divergence angle, the extraction efficiency of the laser beam in the light guide plate cannot be improved by adopting the scheme; the two lasers are monochromatic lights and can become white light only by combining with light, so that the scheme can not combine with light and improve the laser utilization rate and can only be used for an LED light source.

CN201210565257 proposes a conical reflective/transmissive device for beam expanding and shaping of light emitting diodes, which is desired to obtain more uniform LED light beams, and this solution is also not suitable for use with lasers requiring color combination and shimming.

CN201720851508 shows a laser backlight scheme similar to CN105765292A, but this scheme fails to solve the problem of how to increase the utilization rate of laser beams at 360 °, especially the utilization rate of laser beams in the backward direction (180 ° direction away from the light guide plate) of annular light beams diverging at 360 °, so that only 180 ° laser beam expansion can be achieved, and an accurate angle adjustment mechanism needs to be added to achieve accurate alignment between the laser beams and the conical mirror surface, which results in a complex structure and poor stability. And most importantly, this solution fails to give a light field homogenization solution of the laser light in the light guide plate.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a color combining and shimming device for a side-entry laser backlight source for laser display, which can solve the problems of laser beam expansion, light field energy homogenization, color combining and improvement of the utilization rate of a laser light source, so that the laser light source can be used for backlight source illumination of a liquid crystal display.

The color combination and shimming device is of a planar structure, the side face of the color combination and shimming device is formed by surrounding a plurality of reflecting faces and a transmitting face, the transmitting face is a single transmitting face or a combined face with the functions of transmission and reflection, at least one conical reflecting face is arranged inside the color combination and shimming device, and the central axis of the conical reflecting face is perpendicular to the upper surface and the lower surface of the color combination and shimming device.

At least one laser beam incident from the outside is expanded by the one-dimensional beam of the conical reflecting surface to form annular laser, the annular laser is transmitted in the device, the laser in the transmission direction of the non-transmission surface in the annular laser is reflected by the surface with the reflection function in the reflecting surface, the reflection laser changes the transmission direction and emits to the surface with the transmission function on the transmission surface, and finally the annular laser is emitted through the transmission surface. The laser beam is reflected for multiple times by the total reflection surface and the total transmission surface to finally mix and shim, and the laser emergent total transmission surface after the mixing and shimming is coupled into the light guide plate or the backlight cavity of the liquid crystal display to form a uniform surface light source.

Further, the transmission and reflection function surfaces on the transmission surface are combined in an alternating or non-alternating manner.

Furthermore, a refraction, scattering and diffraction structure or a high-transmittance film with a wavelength corresponding to the laser beam is arranged on the transmission surface and used for eliminating the total reflection effect of the laser in the color combination and shimming device of the laser backlight source.

Furthermore, the shape and the angle of the reflecting surface jointly determine the energy distribution of the annular laser on the full transmission surface, so that the purpose of color combination and shimming of various lasers in the laser backlight source is achieved.

Furthermore, the color combination and shimming device of the laser backlight source is made of a light-transmitting material with the refractive index larger than 1.

Further, after the incident laser beam is expanded, fan-shaped distribution is formed, namely the divergence angle of the fan-shaped laser is smaller than 360 degrees and larger than the divergence angle of the laser beam before the laser beam is expanded; the laser of the triangular part formed by the incident point of the laser beam and the transmission surface in the fan-shaped laser is reflected by the reflection surface and is transmitted to the transmission surface.

Further, the laser light transmitted by the color combiner of the laser backlight source is coupled into other optical devices capable of generating at least one of the following optical functions of reflection, refraction, scattering, diffraction, polarization and depolarization, or a combination device with the above optical functions, so as to generate a uniform liquid crystal flat panel display, a projection display lighting source or a lamp lighting source.

Furthermore, at least one laser backlight color-combination shimming device is arranged on one light incident surface of other optical devices.

Further, at least one color combining and shimming device is contained in a display or illuminator.

Furthermore, the laser is light with the central wavelength of 150-12000 nm and can generate spatial coherence.

Furthermore, the output energy of the laser irradiating the color combination shimming device of the laser backlight source is controlled by electrons.

Furthermore, the laser irradiating the color combination and shimming device of the laser backlight source radiates heat in an air cooling mode, a water cooling mode, a semiconductor refrigeration mode and a non-forced cooling mode.

Has the advantages that:

the utility model solves the problems of uneven color combination, poor shimming and low light utilization rate of the three-primary-color laser in the prior technical scheme by arranging the color combination shimming device in the backlight structure and arranging the reflecting surface and the transmitting surface in the color combination shimming device to form a closed ring structure. The complicated optical structure in the traditional scheme is simplified into one, the cost of the laser liquid crystal display is reduced, and the stability of the laser liquid crystal display is improved. The utility model makes the three-primary-color laser light source not limited to projection type, and promotes the development of laser display technology and the flat panel three-primary-color laser display industry.

Drawings

FIG. 1 is a schematic diagram of a color-combining and shimming device of a side-entry laser backlight source for laser display according to the present invention;

FIG. 2 is a light path diagram of a color-combining and shimming device of a high-efficiency beam-expanding shimming laser backlight source for laser display;

FIG. 3 is a light path diagram with a diffuser in an embodiment;

FIG. 4 is an embodiment of a color combining and shimming device of a laser backlight applied to a display;

FIG. 5 is a perspective view of FIG. 4;

fig. 6 is a schematic diagram of the distribution of a 180 deg. fan beam.

The device comprises a 1-laser, a 2-optical device, a 3-color combination shimming device, a 31-conical reflecting surface, a 32-total reflecting surface, a 36-total transmitting surface, a 4-light guide plate, a 5-optical waveguide, a 51-hollow conical surface, a 6-scatterer, a 7-light homogenizing sheet prism sheet combination, an 8-liquid crystal display screen, a 9-laser heat sink and a 10-liquid crystal display frame structure.

Detailed Description

The utility model is described in detail below by way of example with reference to the accompanying drawings.

As shown in the attached figure 1, the utility model provides a side-entry type laser backlight color-combination shimming device for laser display, wherein a conical total reflection surface 31 exists in the laser backlight color-combination shimming device 3, the main material of the laser backlight color-combination shimming device 3 is a transparent material with the refractive index larger than 1, the total reflection surfaces 32 with the included angle of 45 degrees are positioned at three non-light-emitting edges of the transparent plastic laser backlight color-combination shimming device 3, and the total transmission surface 36 is a light-emitting surface of the transparent plastic laser backlight color-combination shimming device 3. The three total reflection surfaces 32 and the total transmission surface 36 surround the conical reflection surface 31 having an apex angle of 30 °. The total transmission surface 36 has a reflection/diffraction/refraction/scattering optical function structure or a structure combination with the above optical functions, which is used for adjusting the distribution of the energy of the 360-degree laser beam generated by the conical total reflection surface 31 with the apex angle of 30 degrees on the total transmission surface 36 of the color combination and shimming device 3 of the light-transmitting plastic laser backlight source. The three total reflection surfaces 32 are mutually in an included angle structure and are used for adjusting the distribution of the energy of a laser beam of 360 degrees generated by the conical total reflection surface 31 with the apex angle of 30 degrees on the total transmission surface 36 of the color combination and shimming device 3 of the light-transmitting plastic laser backlight source. A high reflection film corresponding to the laser beam may also be present on the total reflection surface 32. The structure of the total reflection surface 32 further includes a micro reflection structure, or a segmented reflection structure. Each conical reflecting surface 31 corresponds to a white laser beam formed by combining red, green and blue lasers with central wavelengths of 400-490 nm, 510-560 nm and 610-670 nm.

The light path of the utility model is shown in figure 2, a conical reflecting surface 31 exists in a color-mixing shimming device of a light-transmitting plastic laser backlight source, a total reflecting surface 32 is positioned at the position with length being multiplied by thickness on three sides, and a total transmitting surface 36 with a micro-optical transmission structure. The dotted line is the transverse center line of the transparent plastic laser backlight color-combination shimming device 3, and in the figure, the side of the transverse center line close to the full transmission surface 36 is in the forward direction, and the side far away from the full transmission surface 36 is in the backward direction. The hollow full arrow line is a reflection light path of backward non-total reflection angle light on the total reflection surface 32; the hollow half arrow line is a reflection light path of the backward total reflection angle light on the total reflection surface 32; the solid half arrow line is an emergent light path of the forward total reflection angle light on the total emergent surface 36; the solid full arrow line is the reflection light path of the backward side total reflection angle light on the total reflection surface 32. The total reflection surface 32 can be replaced by a high reflection surface, and the high reflection surface is formed by attaching or plating a laser high reflection medium material on the surface. The present embodiment uses the above optical path to describe the reflection and emission phenomena of the 360 ° annular laser beam in the color combining and shimming device 3 of the laser backlight source.

As shown in fig. 3, in this embodiment, the laser beam emitted from the laser 1 is shaped by the optical device 2 and then becomes a laser beam with a uniform divergence angle, and the laser beam with the uniform divergence angle is irradiated onto the conical reflecting surface 31 to form a 360 ° spatial beam expansion. A line-shaped laser beam after being expanded by 360 ° (in the figure, black arrow lines indicate laser beams of 180 ° sectors where the conical reflection surface is close to the scattering body 6, and open arrow lines indicate laser beams of 180 ° sectors where the conical reflection surface is far from the scattering body 6). The laser beam of a sector of 180 degrees far away from the scatterer 6 changes the propagation direction after being totally reflected by a backward total reflection surface 32 arranged on the color combination shimming device 3, and propagates towards the scatterer 6. The linear laser beam is scattered by the diffuser 6 to form a laser backlight with a uniform divergence of 160 ° in space.

As shown in fig. 4 and 5, in this embodiment, the laser beam emitted from the laser 1 is coupled into the 90 ° conical optical waveguide 5 and then expanded into a 360 ° annular laser beam, and the annular laser beam propagates in the color combining and shimming device 3 of the laser backlight. The round hollow conical surface 51 with an apex angle of 90 degrees is made of transparent ceramic material and is manufactured by adopting a pressing die. One end of the light waveguide 5 with the 90-degree conical reflecting surface is embedded into a mounting hole of a laser heat sink 9, and the other end of the light waveguide is inserted into a through hole in the color combining and shimming device of the laser backlight source and is mutually connected with a frame structure 10 of the liquid crystal display to realize positioning. The backward total reflection surface 32 reflects the backward laser beam far from the light guide plate 4 in the 360 ° ring laser beam toward the return surface 32. The folding surface 32 folds the laser beam perpendicular to the length and width of the light guide plate 4 by 90 degrees, and then the laser beam is emitted from the laser backlight color-combining and shimming device 3 through the full transmission surface overlapped/connected with the scattering body 6 (the full transmission surface is overlapped with the scattering body 6, and is not marked in the figure). The laser beam of the emergent laser backlight color-combination shimming device 3 is expanded by the diffuser 6 and then coupled into the light guide plate 4 with the scattering function and the total reflection function to form a surface light source. A full reflection film is present between the light guide plate 4 and the liquid crystal display housing 11. The micro-prism structure is present on the light guide plate 4 for light-homogenizing and condensing. A light homogenizing sheet and prism sheet combination 7 is arranged on the side of the light guide plate 4 far away from the liquid crystal display shell 11. And a liquid crystal display screen 8 is arranged on one side of the light homogenizing sheet and prism sheet combination 7, which is far away from the light guide plate 4. The liquid crystal display screen 8, the light-homogenizing sheet prism combination 7 and the light guide plate 4 are in contact with the liquid crystal display frame structure 10. The laser 1 is a semiconductor laser or an all-solid-state laser, the central wavelength of the emitted laser is 400-12000 nm, and the emitted light can generate spatial coherence. The plurality of lasers 1 with different center wavelengths correspond to a plurality of optical waveguides 5 with a 90 deg. conical shape. The lasers 1 with different central wavelengths are combined to correspond to a 90-degree conical optical waveguide 5. The scattering and diffusing functions of the light guide plate 4 are achieved by ink printing, diffuse reflection, mechanical etching, chemical etching, mold pressing, and laser-generated points/lines/surfaces. The light homogenizing sheet-prism sheet combination 7 can be replaced by a combination of a material sheet with stimulated emission of fluorescence and an optical sheet material with a prism structure and a scattering structure. One laser backlight color combining and shimming device 3 can be connected with a plurality of conical light waveguides 5 with 90 degrees. One light guide plate 4 may correspond to a plurality of laser backlight color-combining and shimming devices 3. One laser backlight color-combining and shimming device 3 can correspond to a plurality of light guide plates 4.

As shown in fig. 6, the optical device is a light guide plate 3, taking a 180 ° fan beam as an example. In the figure, the oblique line filling area is a light incidence surface capable of incidence laser on the incidence surface of the light guide plate 3 when the oblique line filling area is distributed at an angle less than 360 degrees and is larger than the angle of the vertex angle of a triangle formed by the vertex angle point before the laser beam is expanded and the incidence surface of the optical device surface; the black area is the laser beam distribution of fan-shaped beams exceeding the angle of the vertex angle of a triangle formed by the central point before the laser beam expands as the vertex angle point and the incident surface of the optical device surface.

In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The color combining and shimming device is characterized in that the color combining and shimming device is of a planar structure, the side face of the color combining and shimming device is formed by surrounding a plurality of reflecting faces and a transmitting face, the transmitting face is a single transmitting face or a combined face with the functions of transmission and reflection, at least one conical reflecting face is arranged inside the color combining and shimming device, and the central axis of the conical reflecting face is perpendicular to the upper surface and the lower surface of the color combining and shimming device.

2. The color-combining and shimming device for the lateral laser backlight source for laser display of claim 1, wherein the transmission and reflection functional surfaces on the transmission surface are combined in an alternating or non-alternating manner.

3. The color-combining and shimming device of the lateral laser backlight source for laser display according to claim 1 or 2, wherein the transmission surface is provided with a high-transmittance film with refraction, scattering and diffraction structures or wavelengths corresponding to laser beams.

4. The color-combining and shimming device of the lateral-entry laser backlight source for laser display of claim 3, wherein the color-combining and shimming device is made of a transparent material with a refractive index greater than 1.

5. The color-mixing and shimming device of the lateral entrance laser backlight source for laser display according to claim 4, wherein the laser is light with a central wavelength of 150-12000 nm and capable of generating spatial coherence.