Low-temperature high-response liquid crystal display module

Abstract

The utility model discloses a low temperature high response's liquid crystal display module, including ITO heating film and liquid crystal display screen, ITO heating film is pasted on the surface of liquid crystal display screen through optical cement layer, the carbon nanotube array of vertical arrangement is implanted in the optical cement layer, one end of carbon nanotube array is contacted with ITO heating film, and the other end is contacted with liquid crystal display screen. The liquid crystal display module can improve the heat conduction efficiency between ITO heating film and liquid crystal display screen.

Description

Technical Field

[0001] This utility model relates to liquid crystal display technology, and more particularly to a low-temperature, high-response liquid crystal display module. Background Technology

[0002] When an LCD screen operates in an extremely low temperature environment, the liquid crystal molecules become less active and difficult to twist and rotate, resulting in unstable display and increased screen refresh delay. Therefore, an LCD screen requires a specific temperature range to operate normally.

[0003] Currently, in order to keep the LCD screen within the temperature range required for normal operation in extremely low temperature environments, an ITO heating film is usually placed on the surface of the LCD screen. Heat is generated by energizing the ITO heating film to heat the LCD screen.

[0004] There are two methods for manufacturing ITO heating films. One method is to directly deposit ITO target material onto the surface of the liquid crystal display screen using magnetron sputtering or other methods. However, the polarizing material (polyvinyl alcohol, PVA) of the polarizer inside the liquid crystal display screen is prone to decomposition under the high temperature environment of magnetron sputtering. The other method is to first deposit ITO target material onto the surface of a transparent film material using magnetron sputtering or other methods, and then attach it to the surface of the liquid crystal display screen using an optical adhesive layer. However, there is an optical adhesive layer between the ITO heating film and the liquid crystal display screen, which reduces the thermal conductivity. Utility Model Content

[0005] To address the shortcomings of the prior art, this invention provides a low-temperature, high-response liquid crystal display module that can improve the thermal conductivity between the ITO heating film and the liquid crystal display screen.

[0006] The technical problem to be solved by this utility model is achieved through the following technical solution:

[0007] A low-temperature, high-response liquid crystal display module includes an ITO heating film and a liquid crystal display screen. The ITO heating film is bonded to the surface of the liquid crystal display screen through an optical adhesive layer. A vertically arranged carbon nanotube array is embedded in the optical adhesive layer. One end of the carbon nanotube array is in contact with the ITO heating film, and the other end is in contact with the liquid crystal display screen.

[0008] Furthermore, the carbon nanotube array has a diameter of 8-20 nm and a density of 1.0-1.5 × 10⁻⁶. 6 tubes / mm².

[0009] Furthermore, the thickness of the optical adhesive layer is 25-100 μm.

[0010] Furthermore, the ITO heating film includes a transparent film material and an ITO film layer, wherein the ITO film layer is disposed on the surface of the transparent film material facing the liquid crystal display screen.

[0011] Furthermore, the transparent film material is a PEN film material, a PI film material, or a PET film material.

[0012] Furthermore, the liquid crystal display screen includes a lower polarizer, a lower substrate, a liquid crystal layer, an upper substrate, and an upper polarizer stacked sequentially. The ITO heating film is attached to the surface of the lower polarizer facing away from the lower substrate, or the ITO heating film is attached to the surface of the upper polarizer facing away from the upper substrate.

[0013] Furthermore, the liquid crystal display module also includes protective glass, which is disposed on the light-emitting surface of the liquid crystal display screen.

[0014] Furthermore, the ITO heating film is located between the protective glass and the liquid crystal display screen, and the liquid crystal display module also includes an aerogel heat insulation layer, which is disposed between the ITO heating film and the protective glass.

[0015] Furthermore, the aerogel insulation layer is a SiO2 / TiO2 aerogel with a porosity of 35-55% and a pore size of 20-50 nm.

[0016] Furthermore, the thickness of the aerogel insulation layer is 100-350 μm.

[0017] The present invention has the following beneficial effects: The liquid crystal display module of the present invention embeds a vertically arranged carbon nanotube array in the optical adhesive layer that bonds the ITO heating film and the liquid crystal display screen. By utilizing the high thermal conductivity of the carbon nanotube array, the thermal conductivity between the ITO heating film and the liquid crystal display screen is improved, thereby enabling the liquid crystal display screen to heat up to the temperature range required for normal operation more quickly in extremely low temperature environments, and also improving the heat utilization efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the stacked structure of the liquid crystal display module provided by this utility model.

[0019] Figure 2 A schematic diagram of the stacked structure of another liquid crystal display module provided by this utility model.

[0020] Figure 3 A schematic diagram of the stacked structure of another liquid crystal display module provided by this utility model.

[0021] Figure 4 A schematic diagram of the stacked structure of another liquid crystal display module provided by this utility model. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings and embodiments, examples of which are shown in the drawings. Throughout the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0023] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0025] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," "fixing," and "setting," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] Example 1

[0027] like Figure 1 As shown, a low-temperature, high-response liquid crystal display module includes an ITO heating film 1 and a liquid crystal display screen 3. The ITO heating film 1 is attached to the surface of the liquid crystal display screen 3 by an optical adhesive layer 2. A vertically arranged carbon nanotube array 21 is embedded in the optical adhesive layer 2. One end of the carbon nanotube array 21 is in contact with the ITO heating film 1, and the other end is in contact with the liquid crystal display screen 3.

[0028] The liquid crystal display module of this invention embeds a vertically arranged carbon nanotube array 21 within the optical adhesive layer 2 that bonds the ITO heating film 1 and the liquid crystal display screen 3. By utilizing the high thermal conductivity of the carbon nanotube array 21, the thermal conductivity between the ITO heating film 1 and the liquid crystal display screen 3 is improved. This allows the liquid crystal display screen 3 to heat up to the temperature range required for normal operation more quickly in extremely low temperature environments, and also improves the heat utilization efficiency.

[0029] The high thermal conductivity of the carbon nanotube array 21 is selective, with a thermal conductivity as high as 3000-6000 W / m*K in the axial direction, but only 1-2 W / m*K in the radial direction. This can reduce the heat loss from the plane of the optical adhesive layer 2 when the ITO heating film 1 heats the liquid crystal display screen 3.

[0030] Preferably, the carbon nanotube array 21 has a diameter of 8-20 nm and a density of 1.0-1.5 × 10⁻⁶ nm. 6 The tubes per mm² are of the same length as the optical adhesive layer 2, balancing thermal conductivity and optical performance. Testing showed that when the diameter of the carbon nanotube array 21 is between 8-20 nm, the transmittance loss of the optical adhesive layer 2 in the 550 nm wavelength band is only 0.3%-1.1%, and the haze increase is only 0.15%-0.7%; when the density of the carbon nanotube array 21 is 1.0-1.5 × 10⁻⁶ mm², the optical adhesive layer 2 achieves the same effect. 6 When the tubes / mm², the thermal conductivity of the optical adhesive layer 2 is increased to 0.4-0.5 W / m*K (the original thermal conductivity was only 0.2 W / m*K), while the transmittance in the 550nm band remains between 94% and 97%.

[0031] In this embodiment, the thickness of the optical adhesive layer 2 is 25-100 μm, and it can be, but is not limited to, acrylate resin, silicone resin, or epoxy resin. The thickness of the optical adhesive layer 2 cannot be too large, otherwise the carbon nanotube array 21 is prone to off-axis problems within the optical adhesive layer 2.

[0032] The carbon nanotube array 21 is placed into the optical adhesive layer 2 using a transfer technology. Specifically, the carbon nanotube array 21 is first grown on a silicon substrate using a plasma CVD process, and then the carbon nanotube array 21 is transferred onto a PDMS film using a PDMS film transfer technology. Next, the carbon nanotube array 21 is etched and shaped using a laser. Then, an optical adhesive is coated onto the PDMS film. After the optical adhesive has cured into a film, it is peeled off from the PDMS film along with the carbon nanotube array 21.

[0033] The ITO heating film 1 includes a transparent film material 11 and an ITO film layer 12, wherein the ITO film layer 12 is disposed on the surface of the transparent film material 11 facing the liquid crystal display screen 3. The ITO film layer 12 is formed by depositing an ITO target on the surface of the transparent film material 11 by means of magnetron sputtering or the like.

[0034] In this embodiment, the transparent film material 11 may be, but is not limited to, PEN film material, PI film material or PET film material, etc.

[0035] like Figure 2 and 3 As shown, the liquid crystal display screen 3 includes a lower polarizer 31, a lower substrate 32, a liquid crystal layer 33, an upper substrate 34, and an upper polarizer 35 stacked in sequence. The ITO heating film 1 is attached to the surface of the lower polarizer 31 facing away from the lower substrate 32, or the ITO heating film 1 is attached to the surface of the upper polarizer 35 facing away from the upper substrate 34.

[0036] like Figure 4 As shown, the liquid crystal display module further includes a protective glass 4, which is disposed on the light-emitting surface of the liquid crystal display screen 3. If the ITO heating film 1 is located between the protective glass 4 and the liquid crystal display screen 3, that is, the ITO heating film 1 is attached to the surface of the upper polarizer 35 facing away from the upper substrate 34, then preferably, the liquid crystal display module further includes an aerogel heat insulation layer 5, which is disposed between the ITO heating film 1 and the protective glass 4.

[0037] The aerogel insulation layer 5 is a porous solid material. Its internal nanoscale pores can prevent air flow, thereby cutting off the heat convection conduction between the ITO heating film 1 and the protective glass 4, so as to reduce the heat loss of the ITO heating film 1 to the outside through the protective glass 4.

[0038] In this embodiment, the aerogel insulation layer 5 is made of optical-grade SiO2 / TiO2 aerogel, which is subjected to supercritical drying technology to reduce its porosity to 35-55% and narrow its pore size to 20-50nm, thereby optimizing its optical performance and improving its light transmittance to 93%. The thickness of the aerogel insulation layer 5 is 100-350μm.

[0039] The protective glass 4 and the aerogel heat insulation layer 5, as well as the aerogel heat insulation layer 5 and the ITO heating film 1, are also bonded using ordinary optical adhesive layers (not shown in the figure).

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and not to limit them. Although the present utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present utility model, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the scope of the technical solutions of the present utility model.

Claims

1. A low-temperature high-response liquid crystal display module, comprising an ITO heating film and a liquid crystal display screen, the ITO heating film being attached to the surface of the liquid crystal display screen through an optical adhesive layer; characterized in that, A vertically arranged carbon nanotube array is embedded in the optical adhesive layer. One end of the carbon nanotube array is in contact with the ITO heating film, and the other end is in contact with the liquid crystal display screen.

2. The liquid crystal display module according to claim 1, characterized in that, The carbon nanotube array has a tube diameter of 8-20 nm and a density of 1.0-1.5 x 10 6 tubes / mm².

3. The liquid crystal display module according to claim 1 or 2, characterized in that, The thickness of the optical adhesive layer is 25-100 μm.

4. The liquid crystal display module according to claim 1, characterized in that, The ITO heating film includes a transparent film material and an ITO film layer, wherein the ITO film layer is disposed on the surface of the transparent film material facing the liquid crystal display screen.

5. The liquid crystal display module according to claim 4, characterized in that, The transparent film material is PEN film material, PI film material or PET film material.

6. The liquid crystal display module according to claim 1, characterized in that, The liquid crystal display screen includes a lower polarizer, a lower substrate, a liquid crystal layer, an upper substrate, and an upper polarizer stacked in sequence. The ITO heating film is attached to the surface of the lower polarizer facing away from the lower substrate, or the ITO heating film is attached to the surface of the upper polarizer facing away from the upper substrate.

7. The liquid crystal display module according to claim 1, characterized in that, The liquid crystal display module also includes protective glass, which is disposed on the light-emitting surface of the liquid crystal display screen.

8. The liquid crystal display module according to claim 7, characterized in that, The ITO heating film is located between the protective glass and the liquid crystal display screen. The liquid crystal display module also includes an aerogel heat insulation layer, which is disposed between the ITO heating film and the protective glass.

9. The liquid crystal display module according to claim 8, characterized in that, The aerogel insulation layer is a SiO2 / TiO2 aerogel with a porosity of 35-55% and a pore size of 20-50 nm.

10. The liquid crystal display module according to claim 8 or 9, characterized in that, The thickness of the aerogel insulation layer is 100-350 μm.

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