Spectroscopic polarization device, LCoS projection light machine and laser television

Abstract

The embodiment of the present disclosure provides a light splitting and polarizing device, an LCoS projection light machine and a laser television. The light splitting and polarizing device comprises: a light splitting and polarizing wafer comprising a glass substrate and a dielectric reflecting film on the glass substrate; a support comprising a body part and two support parts, the body part having a through hole, the two support parts being oppositely and spacedly arranged in the through hole and respectively having a limiting groove, the limiting grooves of the two support parts being oppositely arranged and extending in the same direction and having an included angle with the axial direction of the through hole, and the opposite sides of the light splitting and polarizing wafer being limited in the limiting grooves of the two support parts; and a fixing spring plate located on the side of the light splitting and polarizing wafer away from the two support parts and comprising a frame part and a mounting part, the mounting part being fixedly connected with the body part through a fastener, so that the light splitting and polarizing wafer is fixed between the frame part and the two support parts.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of display, in particular to a light splitting and polarizing device, an LCoS projection light machine and a laser television. BACKGROUND

[0002] A conventional LCoS (Liquid Crystal on Silicon) projection light machine uses a light splitting and polarizing device to split incident polarized light and outgoing polarized light before the light is incident on a display chip. In the projection light machine, a common light splitting and polarizing device is a polarizing light splitting prism. The material of the common polarizing light splitting prism is lead-containing glass or environmentally friendly glass. The polarizing light splitting prism with lead-containing glass is not environmentally friendly. The polarizing light splitting prism with environmentally friendly glass has a high photoelastic coefficient and a large optical thickness, and the internal stress thereof can cause serious birefringence, which reduces the projection quality of the LCoS projection light machine and causes color change and brightness change of the projection picture.

[0003] In summary, how to reduce the influence of internal stress birefringence caused by the material and size of the light splitting and polarizing device on the projection quality of the LCoS projection light machine is a problem to be solved. SUMMARY

[0004] Embodiments of the present disclosure provide a light splitting and polarizing device, a projection light machine and a laser television to solve the problem of color change and brightness change of the projection picture, improve the projection picture quality of the projection light machine and improve the display quality of the laser television.

[0005] According to an aspect of an embodiment of the present disclosure, a light splitting and polarizing device is provided, comprising: a light splitting and polarizing wafer including a glass substrate and a dielectric reflective film located on the glass substrate; a bracket including a body portion and two support portions, the body portion having a through hole, the two support portions being oppositely and spacedly arranged in the through hole and each having a limiting groove, the limiting grooves of the two support portions being oppositely arranged and extending in the same direction and having an included angle with the axial direction of the through hole, and opposite sides of the light splitting and polarizing wafer being limited in the limiting grooves of the two support portions; and a fixing spring located on a side of the light splitting and polarizing wafer away from the two support portions, including a frame portion and a mounting portion, the mounting portion being fixedly connected with the body portion by a fastener to fix the light splitting and polarizing wafer between the frame portion and the two support portions.

[0006] In some embodiments, the fixing spring further includes at least one protruding pressing portion extending from the inner side of the frame portion for pressing the light splitting and polarizing wafer.

[0007] In some embodiments, the frame portion includes a first frame edge, a second frame edge, a third frame edge and a fourth frame edge connected in sequence, wherein the first frame edge and the third frame edge are parallel to the two support portions, the mounting portion includes a first part and a second part, the first part is connected with the second frame edge, and the second part is connected with the fourth frame edge.

[0008] In some embodiments, the fastener includes three screws, the first portion is fixedly connected with the body portion by one screw, and the second portion is fixedly connected with the body portion by two screws.

[0009] In some embodiments, projections of the three screws on the circular cross section of the through hole are located at three vertices of an equilateral triangle, respectively.

[0010] In some embodiments, the at least one convex pressing portion includes two convex pressing portions, which are located at inner sides of the first frame edge and the third frame edge and connected with the first frame edge and the third frame edge, respectively.

[0011] In some embodiments, the limiting groove includes a support wall and a side wall, and a U-shaped groove wall connecting the support wall and the side wall and opening towards the light splitting and polarizing wafer.

[0012] In some embodiments, an included angle between the light splitting and polarizing wafer and an axis of the through hole is 45 degrees.

[0013] According to another aspect of the embodiments of the present disclosure, there is provided a LCoS projection light machine including the light splitting and polarizing device of any of the above embodiments.

[0014] According to still another aspect of the embodiments of the present disclosure, there is provided a laser television including the LCoS projection light machine of the above embodiments.

[0015] By using the light splitting and polarizing device, the projection light machine or the laser television of the above embodiments of the present disclosure, the light splitting and polarizing wafer is used to split incident polarized light and outgoing polarized light, reduce the influence of internal stress birefringence caused by the material and size of the light splitting and polarizing device on the projection quality of the LCoS projection light machine, solve the problems of color change and brightness change of the projection picture, improve the projection picture quality of the projection light machine, and further improve the display quality of the laser television.

[0016] Of course, the products or methods implementing any of the embodiments of the present disclosure do not necessarily need to achieve all the advantages described above at the same time. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the related art, the drawings needed to be used in the description of the embodiments of the present disclosure or the related art are briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creating any creative labor on the basis of these drawings.

[0018] Figure 1 Fig. 1 is a perspective assembly diagram of the light splitting and polarizing device of some embodiments of the present disclosure;

[0019] Figure 2For some embodiments of the present disclosure Figure 1 A cross-sectional schematic diagram of the light splitting and polarization device at A-A';

[0020] Figure 3 A front view of a light splitting and polarization device according to some embodiments of the present disclosure;

[0021] Figure 4 This is a front view of a bracket of a light splitting and polarization device according to some embodiments of the present disclosure. DETAILED DESCRIPTION

[0022] The following will be combined with the accompanying drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the embodiments described are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present disclosure.

[0023] In order to solve the problems of color change and brightness change of the projected image, improve the quality of the projected image of the projection optical machine, and enhance the display quality of the laser TV, the embodiments of the present disclosure provide a spectroscopic polarization device, a projection optical machine and a laser TV.

[0024] Figure 1 Schematic diagram of the three-dimensional assembly of the light splitting and polarization device according to some embodiments of the present disclosure. Figure 2 Schematic cross-sectional view of a light splitting and polarization device according to some embodiments of the present disclosure. Figure 3 This is a front view of a light splitting and polarization device according to some embodiments of the present disclosure. Figure 4 This is a front view of a bracket of a light splitting and polarization device according to some embodiments of the present disclosure.

[0025] like Figures 1 to 4 As shown, the light splitting and polarization device for the LCoS projector includes a light splitting and polarization sheet 1 , a bracket 2 and a fixing spring 3 .

[0026] The light-splitting polarizing sheet 1 includes a glass substrate and a dielectric reflective film (not shown) disposed on the glass substrate. For example, the dielectric reflective film can be a dye-type polarizing film. Here, the dye-type polarizing film can be a film that is stretched and oriented to allow only polarization in a specific vibration direction to pass through. It has excellent heat and light resistance, is suitable for automotive and outdoor applications, and has high laser resistance and damage threshold.

[0027] The bracket 2 includes a main body 21 and two supporting portions 22. The main body 21 has a through-hole. The two supporting portions 22 are spaced apart and arranged opposite each other within the through-hole, each having a retaining groove. The retaining grooves of the two supporting portions 22 are arranged opposite each other and extend in the same direction, with the extending direction forming an angle with the axis of the through-hole. The opposing sides of the light-splitting polarizing sheet 1 are retained in the retaining grooves of the two supporting portions 22.

[0028] The fixed spring 3 is located on the side of the optical polarizing sheet 1 away from the two support portions 22. The fixed spring 3 comprises a frame portion 31 and a mounting portion 32. The mounting portion 32 is fixedly connected with the body portion 21 by the fastener 4, so that the optical polarizing sheet 1 is fixed between the frame portion 31 and the two support portions 22.

[0029] In the optical polarizing device in the above embodiment, the optical polarizing sheet 1 is adopted. Due to the difference in the reflection band width of the two polarization components of the dielectric reflection film when the light is obliquely incident, the incident polarized light and the outgoing polarized light can be split, the influence of the internal stress birefringence caused by the material and size of the optical polarizing device on the projection quality of the LCoS projection light machine is reduced, the problems of color change and brightness change of the projection picture are solved, the projection picture quality of the projection light machine is improved, and the display quality of the laser television is further improved.

[0030] In addition, the optical polarizing sheet 1 in the optical polarizing device of the present disclosure is fixed on the bracket 2 by the spring, which can avoid the phenomenon that the placement angle of the optical polarizing sheet 1 is displaced due to assembly of the optical polarizing device. Moreover, the optical polarizing device of the present disclosure controls the pressure of the spring, so that the pressure of the optical polarizing sheet 1 is met, and the internal stress of the optical polarizing sheet 1 is not exceeded, thereby preventing the optical polarizing sheet 1 from being damaged.

[0031] In the related art, for optical elements that need to be fixed, point optical ultraviolet glue is usually used to prevent element vibration and displacement. However, high temperature and possible stray light can melt or even vaporize the already solidified optical ultraviolet glue, resulting in the inability to fix the element or even contamination of the element surface. Therefore, point glue is not suitable for high-brightness projection light machines. The mechanical fixing method adopted by the optical polarizing device of the present disclosure not only solves the problem of the optical ultraviolet glue, but also reduces the risk of damage to the optical polarizing sheet 1 due to improper fixing force position or excessive fixing force.

[0032] In some embodiments, the fixed spring 3 further comprises at least one protruding pressing portion 34 extending from the inner side of the frame portion 31, for pressing the optical polarizing sheet and preventing displacement of the optical polarizing sheet. For example, the at least one protruding pressing portion 34 comprises two protruding pressing portions 34, respectively located on the inner side of the first frame edge 311 and the third frame edge 313 and connected with the first frame edge 311 and the third frame edge 313. The protruding pressing portion can further reinforce the assembly of the optical polarizing sheet 1.

[0033] In some embodiments, the frame part 31 comprises a first frame edge 311, a second frame edge 312, a third frame edge 313 and a fourth frame edge 314 connected in sequence, wherein the first frame edge 311 and the third frame edge 313 are parallel to the two support parts 22, and the mounting part 32 comprises a first part 321 connected with the second frame edge 312 and a second part 322 connected with the fourth frame edge 314.

[0034] In some embodiments, the fastener 4 comprises three screws, the first part 321 is fixedly connected with the body part 21 by one screw, and the second part 322 is fixedly connected with the body part 21 by two screws. The projections of the three screws on the circular cross section of the through hole can be located at the three vertices of an equilateral triangle, respectively. The fixed spring sheet 3 is fixed on the support 2 by the three screws, and a better fixing effect can be achieved on the light-splitting polarized sheet 1.

[0035] In some embodiments, the limiting groove comprises a support wall and a side wall, and a U-shaped groove wall connecting the support wall and the side wall and opening towards the light-splitting polarized sheet 1.

[0036] In some embodiments, the included angle between the light-splitting polarized sheet 1 and the axis of the through hole is 45 degrees.

[0037] According to another aspect of the present disclosure, a LCoS projection light machine is provided, comprising the light-splitting polarized device of any one of the above embodiments. By using the LCoS projection light machine of the present disclosure, the problems of color change and brightness change of the projection picture can be solved, and the projection picture quality of the projection light machine can be improved.

[0038] For example, in the LCoS projection light machine of the present disclosure, the incident light is incident on the light-splitting polarized sheet at an angle of 45 degrees, so that a high extinction ratio can be achieved, and the brightness and contrast of the projection picture can be improved. The incident light is vertically incident on the LCoS display chip through the light-splitting polarized device, so that the degree of polarization of the light can be ensured, the picture contrast and the conversion efficiency of the LCoS display chip to the light can be improved, and the difficulty of subsequent lens design can be reduced.

[0039] According to still another aspect of the present disclosure, a laser television is provided, comprising the LCoS projection light machine described above. By using the laser television of the present disclosure, the display quality of the laser television can be improved.

[0040] It is to be noted that, in the present text, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the presence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0041] Each of the embodiments in the present specification is described in a related manner, and the same or similar parts between the embodiments can be referred to each other. Each of the embodiments focuses on the difference from other embodiments.

[0042] The above only describes the preferred embodiments of the present disclosure and is not intended to limit the protection scope of the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A light splitting and polarization device for a liquid crystal on silicon (LCoS) projector, characterized in that: The application relates to a light splitting and polarizing device. The light splitting and polarizing device comprises a light splitting and polarizing sheet, a support and a fixing spring. The support comprises a body part and two support parts. The body part has a through hole. The two support parts are oppositely arranged in the through hole. Each of the two support parts has a limiting groove.

2. The spectroscopic polarization device of claim 1, wherein The limiting grooves of the two support parts are oppositely arranged and extend in the same direction.

3. The spectroscopic polarization device of claim 2, wherein The extending direction of the limiting grooves has an angle with the axial direction of the through hole.

4. An LCoS projection engine, characterized by, The opposite sides of the light splitting and polarizing sheet are limited in the limiting grooves. The limiting groove comprises a support wall, a side wall and a U-shaped groove wall.

5. A laser television, characterized by, The U-shaped groove wall is connected with the support wall and the side wall and opens towards the light splitting and polarizing sheet. The angle between the light splitting and polarizing sheet and the axis of the through hole is 45 degrees. The fixing spring is arranged on the side of the light splitting and polarizing sheet away from the two support parts. The fixing spring comprises a frame part and a mounting part. The mounting part is fixedly connected with the body part through fasteners. The light splitting and polarizing sheet is fixed between the frame part and the two support parts. The frame part comprises a first frame edge, a second frame edge, a third frame edge and a fourth frame edge which are sequentially connected. The first frame edge and the third frame edge are parallel to the two support parts. The mounting part comprises a first part and a second part. The first part is connected with the second frame edge. The second part is connected with the fourth frame edge. The fixing spring further comprises two convex pressing parts which extend from the inner side of the frame part. The two convex pressing parts are respectively arranged on the inner side of the first frame edge and the third frame edge and connected with the first frame edge and the third frame edge. The convex pressing parts are used for pressing the light splitting and polarizing sheet. The fasteners comprise three screws. The first part is fixedly connected with the body part through one screw. The second part is fixedly connected with the body part through two screws. The projections of the three screws on the circular section of the through hole are respectively located at the three vertices of an equilateral triangle. The application relates to a light splitting and polarizing device. The application relates to a light splitting and polarizing device. The application relates to a light splitting and polarizing device. The application relates to a light splitting and polarizing device. The application relates to a light splitting and polarizing device.

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