Liquid crystal display module

Abstract

The liquid crystal display module comprises a glass panel, a display assembly and a backlight source assembly which are arranged from top to bottom, a functional assembly is arranged between the glass panel and the display assembly and comprises a temperature sensing film layer and a heating film layer, the display assembly comprises a display screen and a control panel, and the temperature sensing film layer and the heating film layer are both attached to the display screen. The temperature sensing film layer and the heating film layer are transparent, the temperature sensing film layer is arranged on the side edge of the heating film layer, the temperature sensing film layer, the heating film layer and the display screen are all electrically connected with the control panel, the control panel judges according to the preset normal working temperature range of the display screen, and if the preset normal working temperature range is not within the range, the control panel feeds back to a vehicle-mounted system to control the heating film layer to heat; when the preset working temperature range is reached, heating is stopped, and the temperature sensing film layer and the heating film layer are transparent, so that the liquid crystal display module can display normally, the heating function is added, and a wider use scene is provided for the liquid crystal display module.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid crystal display screens, and in particular to a liquid crystal display module. Background Art

[0002] Car LCD screens have been widely used, such as window entertainment displays, CMS exterior mirrors, A-pillar transparent displays, etc. However, in extremely cold weather, such as temperatures below minus 30 degrees Celsius, the response speed of the LCD screen will be relatively delayed, and a distorted screen will appear during cold start, and it is more likely that the display will not be normal.

[0003] The heat detection element of the existing LCD screen is an NTC thermistor, which is welded on the PCB board and cannot directly and timely detect the temperature change of the LCD surface. In addition, the NTC element is too large and opaque to be set on the surface of the LCD screen, and the temperature of the LCD screen cannot be controlled in time. Summary of the invention

[0004] In view of the above situation, it is necessary to provide a liquid crystal display module to solve the problems in the prior art that the temperature detection position of the liquid crystal display screen is poorly set and the temperature cannot be controlled.

[0005] A liquid crystal display module comprises a glass panel, a display assembly and a backlight assembly arranged from top to bottom, a functional assembly is arranged between the glass panel and the display assembly, the functional assembly comprises a temperature-sensitive film layer and a heating film layer, the display assembly comprises a display screen and a control board, the temperature-sensitive film layer and the heating film layer are both bonded to the display screen, the temperature-sensitive film layer and the heating film layer are both transparent, the temperature-sensitive film layer is arranged at the side edge of the heating film layer, the temperature-sensitive film layer, the heating film layer and the display screen are all electrically connected to the control board, the control board is used to detect temperature and control heating, and the backlight assembly is used to provide backlight.

[0006] Beneficial effects of the present invention:

[0007] The temperature-sensitive film layer and the heating film layer are directly attached to the display screen respectively. The temperature-sensitive film layer detects the surrounding temperature of the top surface of the display screen. At this time, the vehicle is cold-started, and the temperature of the top surface of the display screen is considered to be the temperature of the display screen, which is then fed back to the control board. The control board makes a judgment based on the preset normal operating temperature range of the display screen. If it is not within the range, the vehicle system receives the feedback temperature value of the control board and automatically controls the heating film layer to heat it. When the preset operating temperature range is reached, the heating is stopped so that the display screen meets the normal operating temperature range, thereby ensuring normal display of the display screen. The temperature-sensitive film layer and the heating film layer are both transparent, so that the liquid crystal display module can display normally without affecting the display screen. Compared with the existing display screen temperature detection, it not only changes the detection position, but also is closer to the display screen and adds a heating function, providing a better and broader use scenario for the liquid crystal display module.

[0008] Furthermore, the temperature-sensitive film layer and the heating film layer are both formed by sputtering indium tin oxide and etching through a yellow light process.

[0009] Furthermore, the light transmittance of the temperature-sensitive film layer and the heating film layer are both greater than 95%.

[0010] Furthermore, the temperature-sensitive film layer includes a plurality of temperature-sensitive wires, and the plurality of temperature-sensitive wires are all wavy.

[0011] Furthermore, the heating film layer includes a plurality of heating wires, and the plurality of heating wires are distributed in parallel.

[0012] Furthermore, the line resistance of the temperature-sensitive wire is: R=[L*(ρ / d)] / W, wherein L is the length of the temperature-sensitive wire, ρ is the resistivity of the temperature-sensitive wire, d is the thickness of the temperature-sensitive wire, and W is the width of the temperature-sensitive wire.

[0013] Furthermore, the thickness of the temperature-sensitive wire and the heating wire are both 40 μm to 60 μm.

[0014] Furthermore, both ends of the temperature sensitive wire are respectively connected to the first silver paste wire, and the opposite sides of several of the heating wires are respectively connected to the second silver paste wire, and the first silver paste wire and the second silver paste wire are both connected to the FPC interface, and the FPC interface connection is arranged on one side of one of the temperature sensitive wires.

[0015] Furthermore, the control board is provided with a plurality of detection chips, and the plurality of detection chips are electrically connected to the FPC interface respectively. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of a liquid crystal display module of the present invention;

[0017] Figure 2 It is a schematic diagram of the structure of the temperature-sensitive film layer and the heating film layer of the present invention.

[0018] In the figure: 1. Glass panel; 2. Functional component; 21. Temperature-sensitive film layer; 211. Temperature-sensitive line; 22. Heating film layer; 23. First silver paste line; 24. Second silver paste line; 25. FPC interface; 3. Display component; 31. Display screen; 32. Control board; 4. Backlight component. DETAILED DESCRIPTION

[0019] In order to facilitate understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Embodiments of the present invention are provided in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing this embodiment is to make the disclosure of the present invention more thorough and comprehensive.

[0020] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items. Moreover, the various embodiments of the present invention, the features in the embodiments, and the features of the embodiments and the embodiments can be freely combined without obvious conflicts or contradictions.

[0022] A liquid crystal display module, such as Figure 1 and Figure 2 As shown, it includes a glass panel 1, a display component 3 and a backlight component 4 arranged from top to bottom, and a functional component 2 is provided between the glass panel 1 and the display component 3.

[0023] Specifically, the functional component 2 includes a temperature-sensitive film layer 21 and a heating film layer 22. The temperature-sensitive film layer 21 and the heating film layer 22 are both attached to the display screen 31. The temperature-sensitive film layer 21 is arranged at the side edge of the heating film layer 22. The temperature-sensitive film layer 21 and the heating film layer 22 are both transparent. The temperature-sensitive film layer 21 and the heating film layer 22 are both formed by sputtering of indium tin oxide and etching through a yellow light process. The light transmittance of the temperature-sensitive film layer 21 and the heating film layer 22 is greater than 95%. The temperature-sensitive film layer 21 includes a plurality of temperature-sensitive wires 211, and the plurality of temperature-sensitive wires 211 are all wavy. The line resistance of the temperature-sensitive wire 211 is: R=[L*(ρ / d)] / W, where L is the length of the temperature-sensitive wire 211, ρ is the resistivity of the temperature-sensitive wire 211, d is the thickness of the temperature-sensitive wire 211, and W is the width of the temperature-sensitive wire 211. Basically, the thickness of the temperature-sensitive wire 211 is 30-250μm. Preferably, the thickness of the temperature-sensitive wire 211 is 40μm to 60μm. The two ends of the temperature-sensitive wire 211 are respectively connected to the first silver paste wire 23. The heating film layer 22 includes a plurality of heating wires 221, and the plurality of heating wires 221 are distributed in parallel. Basically, the thickness of the heating wire 211 is 30-250μm. Preferably, the thickness of the heating wire 221 is 40μm to 60μm. The opposite sides of the heating wire 221 are respectively connected to the second silver paste wire 24. The first silver paste wire 23 and the second silver paste wire 24 are both connected to the FPC interface 25, and the FPC interface 25 is connected to one side of one of the temperature-sensitive wires 211, and indium tin oxide sputtering and yellow light etching are used to form the temperature-sensitive wire 211 and the heating wire 221. Such a process can ensure that the transmittance of the temperature-sensitive film layer 21 and the heating film layer 33 is greater than 95%, thereby not affecting the display effect of the liquid crystal display module. The temperature sensing line 211 is wavy, which lengthens the relative length of the temperature sensing line compared to a straight line. When the temperature changes, the fluctuation of the impedance value of the temperature sensing line 211 is also relatively amplified, so that the impedance detection is more sensitive. The impedance value of the temperature sensing line 211 changes with temperature fluctuations. When the temperature decreases, the resistance value of the temperature sensing line 211 also decreases with the temperature change; when the temperature increases, the resistance value of the temperature sensing line 211 also increases with the temperature change. The temperature sensing line 211 replaces the original NTC thermistor on the PCB board on the back of the display screen 31. The thickness of the temperature sensing line 211 and the heating line 221 are extremely thin, and there is no additional impact on the thickness and installation of the entire liquid crystal display module. The temperature sensing line 211 and the heating line 221 are directly attached to the display screen 31. Multiple temperature sensing lines 211 are located on the side of the display screen 31 to detect the outermost temperature of the display screen 31. The setting of multiple temperature sensing lines 211 ensures the independence of temperature detection, avoids the abnormality of a temperature sensing line 211, and affects the operation of the temperature sensing film layer 21, ensures direct detection and heating on the display screen 31, thereby reducing detection errors and heating losses. The first silver paste line 23 and the second silver paste line 24 are connected to the temperature sensing line 211 and the heating line 221 to form a path.

[0024] Specifically, the display assembly 3 includes a display screen 31 and a control board 32. The temperature-sensitive film layer 21, the heating film layer 22 and the display screen 31 are all electrically connected to the control board 32. The control board 32 is used to detect temperature and control heating. A plurality of detection chips (not shown) are provided on the control board 32, and the plurality of detection chips are electrically connected to the FPC interface 25 respectively. The detection chip uses the high-precision impedance measurement chip AD5933 of Analog Devices to detect the impedance value of the temperature-sensitive line 211. The impedance value detection range of this chip is 100Ω to 10MΩ, and the measurement system accuracy is 0.5%. A single detection chip VIN / VOUT two pins are electrically connected to a single temperature-sensitive line 211 to detect the resistance value of the temperature-sensitive line 211. The detection impedance of the temperature-sensitive line 211 is converted into a temperature value by the detection chip, and the detection chip SCL / SDA two pins are electrically connected to the control board 32. The control board 32 determines whether the temperature value is within the normal working range of the display screen 31. If not, it is immediately fed back to the vehicle system to control the heating film layer 22 to start. It should be noted that if Figure 2 As shown, when the three temperature sensing lines 211 detect that the temperature deviation range is ±1°C and the temperature value is lower than -30°C at the same time, the detection chip transmits a signal to the control board 32, and the control board 32 feeds back to the vehicle system, thereby controlling the heating film layer 22 to start heating; when two of the temperature sensing lines 211 detect that the temperature is lower than -30°C, the detection chip transmits a signal to the control board 32, and the control board 32 feeds back to the vehicle system, thereby controlling the heating film layer 22 to start heating; when two of the temperature sensing lines 211 detect that the temperature value is lower than -30°C at the same time, and the other temperature sensing line 211 detects that the temperature is higher than -30°C and the temperature deviation is greater than 5°C or no temperature value is detected, a warning will be issued and no heating will be performed. During the heating process, the impedance change of the temperature sensing line 211 is also continuously detected, thereby corresponding to the temperature value of the display screen 31. When it meets the normal working temperature range of the display screen 31, the vehicle system controls the heating film layer 22 to stop heating. It is understandable that in extremely cold weather, the vehicle system can be controlled to appropriately extend the heating time so that the temperature of the display screen 31 is higher than the critical point of the preset working temperature range of -30°C, which better meets the needs of long-term work. The backlight assembly 4 is used to provide backlight.

[0025] Table 1

[0026]

[0027] It should be noted that Table 1 is a comparison of the impedance value, transmittance, heating time, heating circuit and cost of the temperature sensing line 211 corresponding to different thicknesses of functional components 2 (the thicknesses of the temperature sensing film layer 21 and the heating film layer 22 are the same). For temperature change detection, since the temperature-sensitive film layer 21 and the heating film layer 22 are both film layers, Table 1 lists the square resistance values ​​of different thicknesses of functional components 2. The longer the temperature-sensitive wire 211 is, when the temperature changes, the greater the fluctuation of the impedance value of the temperature-sensitive wire 211 with the temperature change, and the corresponding temperature change detection of the temperature-sensitive wire 211 is also more sensitive; for transmittance, the higher the better, the thickness of the functional component 2 is below 60um, and the transmittance is greater than 86% when the wavelength is λ=550nm, as detected by a transmittance tester. At this time, the transmittance is tested separately. Due to factors such as sealing and reflection, the transmittance will be improved after being assembled into a liquid crystal display module; for heating speed, the shorter the time, the better. Assuming that the temperature needs to rise by 10 degrees in a short time, the faster the heating speed, the higher the required power consumption. For safety reasons, high voltage and high current cannot be used for surface heating of the display screen 31, and 5 / 24V is selected for automotive voltage. When the current is lower than 700mA, the optimal thickness of the functional component 2 is 40um to 70um. In terms of cost, when the thickness of the functional component 2 is less than 40um or the thickness of the functional component 2 is greater than 60um, the cost is higher than when the thickness of the functional component 2 is 40um to 60um due to the limitation of the manufacturing process. Considering the impedance value, transmittance, heating speed, heating current and cost of the temperature sensing line 211, the optimal thickness of the functional component 2 is 40um to 60um.

[0028] In the present invention, the temperature-sensitive film layer 21 and the heating film layer 22 are directly attached to the display screen 31 respectively, and the temperature-sensitive film layer 21 detects the peripheral temperature of the top surface of the display screen 31. At this time, the vehicle is cold-started, and the temperature of the top surface of the display screen 31 is considered to be the temperature of the display screen, and then fed back to the control board 32. The control board 32 makes a judgment based on the preset normal operating temperature range of the display screen 31. If it is not within the range, the control board 32 feeds back the temperature value to the vehicle-mounted system to control the heating film layer 22 for heating. When the preset operating temperature range is reached, the heating is stopped so that the display screen 31 meets the normal operating temperature range, thereby ensuring the normal display of the display screen 31. The temperature-sensitive film layer 21 and the heating film layer 22 are both transparent, so that the liquid crystal display module can display normally without affecting the display screen. Compared with the existing temperature detection of the display screen 31, not only the detection position is changed, but also it is closer to the display screen 31, and the heating function is added, which provides a better and broader use scenario for the liquid crystal display module.

[0029] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0030] The above-mentioned embodiments only express the implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A liquid crystal display module, characterized in that: It includes a glass panel, a display component and a backlight component arranged from top to bottom, a functional component is arranged between the glass panel and the display component, the functional component includes a temperature-sensitive film layer and a heating film layer, the display component includes a display screen and a control board, the temperature-sensitive film layer and the heating film layer are both bonded to the display screen, the temperature-sensitive film layer and the heating film layer are both transparent, the temperature-sensitive film layer is arranged at the side edge of the heating film layer, the temperature-sensitive film layer, the heating film layer and the display screen are all electrically connected to the control board, the control board is used to detect temperature and control heating, and the backlight component is used to provide backlight.

2. The liquid crystal display module according to claim 1, characterized in that: The temperature-sensitive film layer and the heating film layer are both formed by sputtering indium tin oxide and etching through a yellow light process.

3. The liquid crystal display module according to claim 1, characterized in that: The light transmittance of the temperature-sensitive film layer and the heating film layer are both greater than 95%.

4. The liquid crystal display module according to claim 1, characterized in that: The temperature-sensitive film layer includes a plurality of temperature-sensitive lines, and the plurality of temperature-sensitive lines are all wavy.

5. The liquid crystal display module according to claim 4, characterized in that: The heating film layer includes a plurality of heating wires, and the plurality of heating wires are distributed in parallel.

6. The liquid crystal display module according to claim 4, characterized in that: The line resistance of the temperature-sensitive wire is: R=[L*(ρ / d)] / W, wherein L is the length of the temperature-sensitive wire, ρ is the resistivity of the temperature-sensitive wire, d is the thickness of the temperature-sensitive wire, and W is the width of the temperature-sensitive wire.

7. The liquid crystal display module according to claim 5, characterized in that: The thickness of the temperature-sensitive wire and the heating wire are both 40 μm to 60 μm.

8. The liquid crystal display module according to claim 5, characterized in that: The two ends of the temperature-sensitive wire are respectively connected to the first silver paste wire, and the opposite sides of several heating wires are respectively connected to the second silver paste wire. The first silver paste wire and the second silver paste wire are both connected to the FPC interface, and the FPC interface connection is arranged on one side of one of the temperature-sensitive wires.

9. The liquid crystal display module according to claim 8, characterized in that: The control board is provided with a plurality of detection chips, and the plurality of detection chips are electrically connected to the FPC interface respectively.

Images