LCD (Liquid Crystal Display) module, LCD ray machine and projection equipment

Abstract

The invention relates to the technical field of projection equipment, and discloses an LCD module, an LCD light machine and projection equipment. The LCD module provided by the invention comprises a first polaroid, an LCD light valve and a second polaroid which are arranged in sequence, the first polarizer transmits the first-direction polarized light and reflects the non-first-direction polarized light, and the second polarizer transmits the second-direction polarized light and reflects the non-second-direction polarized light. When the LCD module is in a dark field state, a first polarizing film transmits polarized light in a first direction and reflects polarized light not in the first direction, so that light emitted into an LCD light valve is the polarized light in the first direction, the LCD light valve is controlled to transmit the polarized light in the first direction, and the polarized light in the first direction is emitted to a second polarizing film; the second polarizing film reflects the polarized light in the first direction, so that light emitted from the second polarizing film is reduced, the display effect of the projection equipment in the dark field state is improved, and the problem that the display effect of the projection equipment in the dark field state is poor is solved.

Description

Technical Field

[0001] The present application belongs to the technical field of projection equipment, and in particular relates to LCD modules, LCD optical machines and projection equipment. Background Art

[0002] LCD projectors are gaining widespread adoption in a growing number of venues due to their simple imaging principles, compact optical engine size, and low cost. However, because LCD optical engines control the flow of light by manipulating the arrangement of liquid crystal molecules to display different colors and brightness, projection equipment often exhibits poor display quality in dark environments.

[0003] Therefore, there is a need to improve the existing technology.

[0004] The above information is presented as background information only to assist with an understanding of the present disclosure and is not a determination or admission that any of the above may be applicable as prior art with respect to the present disclosure. Summary of the Invention

[0005] The embodiments of the present application provide an LCD module, an LCD light engine, and a projection device to solve the problem of poor display effect of the projection device in a dark field state.

[0006] In a first aspect, an embodiment of the present application provides an LCD module, comprising a first polarizer, an LCD light valve, and a second polarizer arranged in sequence;

[0007] The first polarizer is used to transmit light polarized in a first direction and reflect light polarized in a direction other than the first direction, and the second polarizer is used to transmit light polarized in a second direction and reflect light polarized in a direction other than the second direction.

[0008] In a possible implementation, the LCD light valve includes a TFT glass substrate, a liquid crystal layer, and a color filter glass substrate arranged in sequence, the first polarizer is arranged on a side of the TFT glass substrate away from the liquid crystal layer, and the second polarizer is arranged on a side of the color filter glass substrate away from the liquid crystal layer.

[0009] In a possible embodiment, the first polarizer includes multiple birefringent layers and multiple transparent medium layers, and the multiple birefringent layers and the multiple transparent medium layers are alternately arranged in sequence, so that the first polarizer can transmit polarized light in the first direction and reflect polarized light in a direction other than the first direction.

[0010] In a possible implementation, the birefringence layer has a thickness of H1, the light-transmitting medium layer has a thickness of H2, and the range of 100 nm ≤ H1 ≤ 120 nm and 100 nm ≤ H2 ≤ 120 nm is satisfied.

[0011] In one possible embodiment, each of the birefringent layers has a thickness, and the thicknesses of the multiple birefringent layers gradually decrease from the outermost two sides of the first polarizer to the middle of the first polarizer; each of the light-transmitting medium layers has a thickness, and the thicknesses of the multiple light-transmitting medium layers gradually increase from the outermost two sides of the first polarizer to the middle of the first polarizer.

[0012] In a second aspect, an embodiment of the present application further provides an LCD optical machine, which includes an LCD module as described in any of the above items, as well as a light source, a light-distributing element, an illumination mirror, an imaging mirror, a reflector and a lens, wherein the light source, the light-distributing element, the illumination mirror, the LCD module, the imaging mirror, the reflector and the lens are arranged in sequence.

[0013] In a possible implementation, the light homogenizing element is a light cup, the first polarizer is fixedly connected to a side of the lighting mirror close to the light homogenizing element, and the lighting mirror is fixedly connected to a side of the light cup away from the light source.

[0014] In a possible implementation, the LCD light engine further includes an anti-reflection film, and the anti-reflection film is disposed on a side of the LCD light valve close to the first polarizer.

[0015] In a possible embodiment, the LCD light engine also includes a shell and a fan, the light source, light equalizing element, lighting mirror, LCD module, imaging mirror, reflector and lens are all arranged in the shell, a first air duct is formed between the lighting mirror and the LCD module, and a second air duct is formed between the imaging mirror and the LCD module. The fan is arranged on the shell, and the fan is used to blow air into the first air duct and the second air duct. An air outlet is opened on the shell, and the first air duct and the second air duct are both connected to the air outlet.

[0016] In a third aspect, an embodiment of the present application further provides a projection device, which includes the LCD light engine as described in any one of the above items.

[0017] Compared with the prior art, this application has the following beneficial effects:

[0018] The LCD module provided in the embodiment of the present application, when in a dark field state, makes the first polarizer transmit light polarized in the first direction and reflect light polarized in a non-first direction, so that the light entering the LCD light valve is light polarized in the first direction. The LCD light valve is controlled to transmit light polarized in the first direction, so that the light polarized in the first direction is directed to the second polarizer, and the second polarizer reflects the light polarized in the first direction, thereby reducing the occurrence of light being emitted from the second polarizer, thereby improving the display effect of the projection device in the dark field state and solving the problem of poor display effect of the projection device in the dark field state. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0020] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings. In the following description, the same reference numerals represent the same parts.

[0021] Figure 1 This is a schematic diagram of the structure of the LCD module provided in an embodiment of the present application in a dark field state.

[0022] Figure 2 This is a structural diagram of the LCD module provided in an embodiment of the present application when the screen is fully white.

[0023] Figure 3 This is a schematic diagram of the structure of the LCD light valve provided in an embodiment of the present application.

[0024] Figure 4 This is a schematic diagram of the first structure of the LCD optical engine provided in an embodiment of the present application.

[0025] Figure 5 A schematic diagram of a portion of the structure of the LCD optical engine provided in an embodiment of the present application.

[0026] Figure 6 This is a schematic diagram of the second structure of the LCD optical engine provided in an embodiment of the present application.

[0027] Figure 7 This is a third structural schematic diagram of the LCD optical engine provided in an embodiment of the present application.

[0028] In the figure: 1. LCD module; 11. First polarizer; 12. LCD light valve; 121. TFT glass substrate; 122. Liquid crystal layer; 123. Color film glass substrate; 13. Second polarizer; 14. Anti-reflection film; 2. LCD optical engine; 21. Light source; 22. Light homogenizer; 221. Optical cup; 222. Free-form lens; 23. Illuminating mirror; 24. Imaging mirror; 25. Reflector; 26. Lens; 27. Housing; 28. Fan; 3. First air duct; 4. Second air duct; 5. Air outlet. DETAILED DESCRIPTION

[0029] In order to explain in detail the possible application scenarios, technical principles, specific solutions that can be implemented, and the purpose and effects of this application, the following is a detailed description of the specific embodiments listed in conjunction with the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of this application and are therefore only examples and are not intended to limit the scope of protection of this application.

[0030] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more features.

[0031] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application.

[0032] The present invention provides an LCD module 1, an LCD light engine 2, and a projection device to solve the problem of poor display effect of the projection device in a dark field state.

[0033] See also Figure 1 In one embodiment of the present application, an LCD module 1 is provided, comprising a first polarizer 11, an LCD light valve 12, and a second polarizer 13, which are arranged in sequence. The first polarizer 11 is configured to transmit light polarized in a first direction and reflect light polarized in a direction other than the first direction. The second polarizer 13 is configured to transmit light polarized in a second direction and reflect light polarized in a direction other than the second direction.

[0034] When the LCD module 1 is in a dark field state, the first polarizer 11 transmits polarized light in the first direction and reflects non-polarized light in the first direction, so that the light incident on the LCD light valve 12 is polarized light in the first direction. The LCD light valve 12 is controlled to transmit the polarized light in the first direction, so that the polarized light in the first direction is directed to the second polarizer 13. The second polarizer 13 reflects the polarized light in the first direction, thereby reducing the occurrence of light emitted from the second polarizer 13, thereby improving the display effect of the projection device in the dark field state and solving the problem of poor display effect of the projection device in the dark field state.

[0035] See also Figure 1 and Figure 2 In addition, since the first polarizer 11 can reflect light polarized in a direction other than the first direction and the second polarizer 13 can reflect light polarized in a direction other than the second direction, the temperature rise caused by the first polarizer 11 or the second polarizer 13 absorbing light is reduced, thereby reducing the aging and discoloration of the polarizer and the failure of the LCD light valve 12 caused by the temperature rise.

[0036] In this embodiment, the first polarizer 11 is a transmissive P-reflective S-type polarizer, and the second polarizer 13 is a transmissive S-reflective P-type polarizer. In some embodiments of the present application, the first polarizer 11 is a transmissive S-reflective P-type polarizer, and the second polarizer 13 is a transmissive P-reflective S-type polarizer.

[0037] See also Figure 1 and Figure 2 In this embodiment, the first polarizer 11 is adhered and fixed to the light incident side of the LCD light valve 12, and the second polarizer 13 is adhered and fixed to the light emitting side of the LCD light valve 12; in some embodiments of the present application, the first polarizer 11 is located on the light incident side of the LCD light valve 12, and the first polarizer 11 and the LCD light valve 12 are spaced apart, and the second polarizer 13 is located on the light emitting side of the LCD light valve 12, and the second polarizer 13 is spaced apart from the LCD light valve 12.

[0038] See also Figure 1 and Figure 3 The LCD light valve 12 includes a TFT glass substrate 121, a liquid crystal layer 122, and a color filter glass substrate 123, which are arranged in this order. The first polarizer 11 is disposed on the side of the TFT glass substrate 121 away from the liquid crystal layer 122, and the second polarizer 13 is disposed on the side of the color filter glass substrate 123 away from the liquid crystal layer 122. The TFT glass substrate 121 is a glass substrate that carries thin-film transistors and can control the deflection state of liquid crystal molecules to adjust the amount of light passing through. The color filter glass substrate 123 is a glass substrate that carries a color filter layer and is used to separate and modulate light.

[0039] The first polarizer 11 includes multiple birefringent layers and multiple transparent dielectric layers. The multiple birefringent layers and the multiple transparent dielectric layers are alternately arranged, so that the first polarizer 11 can transmit light polarized in the first direction and reflect light polarized in a direction other than the first direction. In this embodiment, the number of birefringent layers ranges from 300 to 500, and the number of transparent dielectric layers ranges from 300 to 500. The thickness of the birefringent layers is H1, and the thickness of the transparent dielectric layers is H2. The values ​​of 100 nm ≤ H1 ≤ 120 nm and 100 nm ≤ H2 ≤ 120 nm are satisfied. Ensuring that the values ​​of 100 nm ≤ H1 ≤ 120 nm and 100 nm ≤ H2 ≤ 120 nm enhance the transmission of light polarized in the first direction and the reflection of light polarized in a direction other than the first direction.

[0040] Furthermore, each birefringent layer has a thickness, and the thicknesses of the multiple birefringent layers gradually decrease from the outermost sides of the first polarizer 11 toward the center of the first polarizer 11; each transparent dielectric layer has a thickness, and the thicknesses of the multiple transparent dielectric layers gradually increase from the outermost sides of the first polarizer 11 toward the center of the first polarizer 11, which is beneficial for improving the effect of transmitting polarized light in the first direction and improving the effect of reflecting polarized light in a direction other than the first direction.

[0041] See also Figure 1 and Figure 4 The embodiment of the present application also provides an LCD optical machine 2, including the above-mentioned LCD module 1 and a light source 21, a light-distributing element 22, an illumination mirror 23, an imaging mirror 24, a reflector 25 and a lens 26. The light source 21, the light-distributing element 22, the illumination mirror 23, the LCD module 1, the imaging mirror 24, the reflector 25 and the lens 26 are arranged in sequence.

[0042] By adopting the above-mentioned LCD module 1 in the LCD light engine 2, the temperature increase of the LCD module 1 caused by the first polarizer 11 or the second polarizer 13 absorbing light can be reduced, so that there is no need to set a heat insulation component in the LCD light engine 2 to reduce the heat generated by the light source 21 from being transferred to the LCD module 1. This is not only beneficial to simplifying the structure of the LCD light engine 2, but also can improve the projection effect of the LCD light engine 2.

[0043] See also Figure 2 and Figure 4 In this embodiment, the light source 21 is an LED light source 21. When the LCD module 1 is in a full white screen, the first polarizer 11 transmits polarized light in the first direction and reflects polarized light in a non-first direction. The reflected polarized light in the non-first direction can be reflected back to the LED light source 21 and excite the phosphor in the LED light source 21, thereby increasing the brightness of the LED light source 21 and thus improving the projection effect of the LCD light machine 2.

[0044] See also Figure 5 In some embodiments of the present application, the light-homogenizing element 22 is a light cup 221, the first polarizer 11 is spaced apart from the LCD light valve 12, the illumination filter 23 is fixedly mounted on the side of the light cup 221 away from the light source 21, and the first polarizer 11 is fixedly connected to the side of the illumination filter 23 closer to the light cup 221. This reduces the loss of light reflected from the first polarizer 11 back to the light source 21, thereby further improving the projection effect of the LCD light engine 2. Furthermore, an anti-reflection film 14 is disposed on the side of the LCD light valve 12 closer to the first polarizer 11. This helps increase light transmittance, thereby improving overall brightness.

[0045] See also Figure 6In addition, in some embodiments of the present application, the light-homogenizing element 22 is a free-form surface lens 222. The setting of the free-form surface lens 222 is beneficial to reducing the light intensity angle of the light incident on the LCD module 1, thereby improving the brightness of the light incident on the LCD module 1, and thus improving the projection effect of the LCD light machine 2.

[0046] See also Figure 7 The LCD light engine 2 also includes a shell 27 and a fan 28. The light source 21, the light-distributing element 22, the lighting mirror 23, the LCD module 1, the imaging mirror 24, the reflector 25 and the lens 26 are all arranged in the shell 27. A first air duct 3 is formed between the lighting mirror 23 and the LCD module 1, and a second air duct 4 is formed between the imaging mirror 24 and the LCD module 1. The fan 28 is arranged on the shell 27. The fan 28 is used to blow air into the first air duct 3 and the second air duct 4. An air outlet 5 is opened on the shell 27. The first air duct 3 and the second air duct 4 are both connected to the air outlet 5. The air flow blown out by the fan 28 can bring the heat on the lighting mirror 23, the LCD module 1 and the imaging mirror 24 out of the LCD light engine 2. In addition, a heat dissipation space is formed between the reflector 25 and the lens 26, and the heat dissipation space is connected to the air outlet 5. When the air flow passes through the first air duct 3 or the second air duct 4 and flows to the air outlet 5, it can drive the gas flow in the heat dissipation space, thereby achieving heat dissipation of the reflector 25 and the lens 26.

[0047] The present application also provides a projection device, which includes the aforementioned LCD light engine 2. Since the projection device includes the aforementioned LCD light engine 2, it has at least some or all of the beneficial effects of the aforementioned LCD light engine 2, which will not be described in detail here.

[0048] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0049] Finally, it should be noted that although the above embodiments have been described in the specification and drawings of this application, this does not limit the scope of patent protection of this application. All technical solutions generated by replacing or modifying equivalent structures or equivalent processes based on the essential concepts of this application using the contents recorded in the specification and drawings of this application, as well as directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, are included in the scope of patent protection of this application.

Claims

1. An LCD module, characterized in that: It comprises a first polarizing plate (11), an LCD light valve (12) and a second polarizing plate (13) which are arranged in sequence; The first polarizer (11) is used for transmitting polarized light in a first direction and reflecting polarized light in a direction other than the first direction, and the second polarizer (13) is used for transmitting polarized light in a second direction and reflecting polarized light in a direction other than the second direction.

2. The LCD module according to claim 1, wherein: The LCD light valve (12) comprises a TFT glass substrate (121), a liquid crystal layer (122), and a color film glass substrate (123) which are arranged in sequence; the first polarizer (11) is arranged on a side of the TFT glass substrate (121) away from the liquid crystal layer (122); and the second polarizer (13) is arranged on a side of the color film glass substrate (123) away from the liquid crystal layer (122).

3. The LCD module according to claim 1, wherein: The first polarizer (11) comprises a plurality of birefringent layers and a plurality of light-transmitting medium layers, wherein the plurality of birefringent layers and the plurality of light-transmitting medium layers are alternately arranged in sequence, so that the first polarizer (11) can transmit polarized light in a first direction and reflect polarized light in a non-first direction.

4. The LCD module according to claim 3, wherein: The thickness of the birefringent layer is H1, and the thickness of the light-transmitting medium layer is H2, 100 nm ≤ H1 ≤ 120 nm, and 100 nm ≤ H2 ≤ 120 nm.

5. The LCD module according to claim 3, wherein: Each of the birefringent layers has a thickness, and the thicknesses of the multilayer birefringent layers gradually decrease from the outermost two sides of the first polarizer (11) toward the middle of the first polarizer (11); each of the light-transmitting medium layers has a thickness, and the thicknesses of the multilayer light-transmitting medium layers gradually increase from the outermost two sides of the first polarizer (11) toward the middle of the first polarizer (11).

6. An LCD light engine, characterized in that: The LCD optical machine (2) comprises an LCD module (1) as claimed in any one of claims 1 to 5, as well as a light source (21), a light-distributing element (22), an illumination mirror (23), an imaging mirror (24), a reflector (25) and a lens (26), wherein the light source (21), the light-distributing element (22), the illumination mirror (23), the LCD module (1), the imaging mirror (24), the reflector (25) and the lens (26) are arranged in sequence.

7. The LCD optical engine according to claim 6, wherein: The light-homogenizing element (22) is a light cup (221), the first polarizer (11) is fixedly connected to a side of the lighting mirror (23) close to the light-homogenizing element (22), and the lighting mirror (23) is fixedly connected to a side of the light cup (221) away from the light source (21).

8. The LCD optical engine according to claim 7, wherein: The LCD light engine (2) further comprises an anti-reflection film (14), and the anti-reflection film (14) is arranged on a side of the LCD light valve (12) close to the first polarizer (11).

9. The LCD optical engine according to claim 6, wherein: The LCD light engine (2) further comprises a housing (27) and a fan (28); the light source (21), the light-distributing element (22), the lighting mirror (23), the LCD module (1), the imaging mirror (24), the reflector (25) and the lens (26) are all arranged in the housing (27); a first air duct (3) is formed between the lighting mirror (23) and the LCD module (1); a second air duct (4) is formed between the imaging mirror (24) and the LCD module (1); the fan (28) is arranged on the housing (27); the fan (28) is used to blow air into the first air duct (3) and the second air duct (4); an air outlet (5) is provided on the housing (27); the first air duct (3) and the second air duct (4) are both connected to the air outlet (5).

10. A projection device, characterized in that: The projection device comprises an LCD light engine (2) as claimed in any one of claims 6 to 9.

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