CN102938236A - Liquid crystal display device - Google Patents

Abstract

The embodiment of the invention discloses a liquid crystal display device, relates to the field of liquid crystal display technology, and solves the problem that the existing liquid crystal display cannot work normally in a low temperature environment lower than -20°C. In the embodiment of the present invention, since a transparent heating unit for heating the liquid crystal material in the liquid crystal display panel is arranged between the liquid crystal display panel and the backlight source, the liquid crystal material can be heated in this way, so that the liquid crystal display device can operate at temperatures lower than -20°C. It can work normally in a low temperature environment, so that the liquid crystal display using the liquid crystal display device can work normally in a low temperature environment lower than -20°C.

Description

Liquid crystal display device

technical field

The invention relates to the technical field of liquid crystal display, in particular to a liquid crystal display device.

Background technique

Liquid crystal displays are made by utilizing the special photoelectric properties of liquid crystal materials. Existing liquid crystal displays mainly include liquid crystal display devices, control circuits, and product casings. Liquid crystal display devices mainly include liquid crystal display panels and backlight sources.

For liquid crystal displays used in offices, under normal circumstances, since the ambient temperature is basically fixed, the temperature requirements for the normal operation of the liquid crystal display (between -20°C and 70°C) can be guaranteed. However, the liquid crystal display used in some industrial control industries and other specific places may not meet the temperature requirements for the normal operation of the liquid crystal display due to relatively large fluctuations in the ambient temperature, such as lower than -20°C or higher than 70°C. As a result, the LCD monitor cannot work normally. This is because the liquid crystal material only exhibits a liquid crystal state in the temperature range of -20°C to 70°C. If the temperature exceeds this range, the liquid crystal state will disappear, resulting in the failure of the liquid crystal display to work normally.

Contents of the invention

Embodiments of the present invention provide a liquid crystal display device, which solves the problem that the existing liquid crystal display cannot work normally in a low temperature environment lower than -20°C.

In order to achieve the above object, embodiments of the present invention adopt the following technical solutions:

A liquid crystal display device includes a liquid crystal display panel and a backlight source, and a transparent heating unit for heating liquid crystal material in the liquid crystal display panel is arranged between the liquid crystal display panel and the backlight source.

Further, the transparent heating unit is a resistive film.

Further, the resistive film is directly formed on the side of the liquid crystal display panel opposite to the backlight source.

Further, the shape of the transparent heating unit is the same as the shape of the opposite surface of the liquid crystal display panel and the backlight source.

Further, the liquid crystal display device further includes a temperature sensor, a controller, a heating driver, and a heating power supply; the controller is electrically connected to the temperature sensor and the heating driver, and the heating power supply and the transparent heating unit Electrically connected to the heating driver; the temperature sensor is used to detect the ambient temperature of the environment where the liquid crystal display panel is located; the controller is used to determine when the ambient temperature detected by the temperature sensor is lower than the temperature threshold , sending a control signal to the heating driver; the heating driver is used to control the heating power supply to supply power to the transparent heating unit according to the control signal, so as to heat the liquid crystal material in the liquid crystal display panel.

Further, the temperature sensor is a thermistor.

Further, the liquid crystal display device also includes a level conversion circuit, which is arranged between the thermistor and the controller, and is used to convert the resistance value of the thermistor into the required value of the controller. level, the level conversion circuit includes a power supply, a voltage dividing resistor and a differential amplifier; the power supply, the thermistor and the voltage dividing resistor are connected in series; the reverse input terminal of the differential amplifier is connected to the power supply The negative electrode is electrically connected; the position where the thermistor and the voltage dividing resistor are electrically connected to each other is electrically connected to the positive input end of the differential amplifier; the output end of the differential amplifier is electrically connected to the controller.

Further, the controller and the heating driver are arranged on a PCB.

In the liquid crystal display device provided by the embodiment of the present invention, since a transparent heating unit for heating the liquid crystal material in the liquid crystal display panel is arranged between the liquid crystal display panel and the backlight source, the liquid crystal material can be heated in this way, so that the liquid crystal display device can It can work normally in a low temperature environment lower than -20°C, so that a liquid crystal display using the liquid crystal display device can work normally in a low temperature environment lower than -20°C.

Description of drawings

In order to illustrate the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings that are used in the description of the embodiments.

FIG. 1 is a schematic cross-sectional view of a liquid crystal display device provided by an embodiment of the present invention;

FIG. 2 is a block diagram of some components in another liquid crystal display device provided by an embodiment of the present invention;

FIG. 3 is a schematic diagram of a level conversion circuit connected to a thermistor and a controller provided by an embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention.

An embodiment of the present invention provides a liquid crystal display device, as shown in FIG. 1 , comprising a liquid crystal display panel 11 and a backlight source 13, and a device for heating the liquid crystal material in the liquid crystal display panel is arranged between the liquid crystal display panel 11 and the backlight source 13. Transparent heating unit 12.

In the liquid crystal display device provided by the embodiment of the present invention, since a transparent heating unit for heating the liquid crystal material in the liquid crystal display panel is arranged between the liquid crystal display panel 11 and the backlight source 13, the liquid crystal material can be heated in this way, so that the liquid crystal display device It can work normally in a low temperature environment lower than -20°C, so that a liquid crystal display using the liquid crystal display device can work normally in a low temperature environment lower than -20°C.

In the above embodiments, the transparent heating unit 12 can be a resistive film, so that the heating is fast and the heating effect is good.

The resistance film can be directly formed on the opposite side of the liquid crystal display panel 11 and the backlight source 13, so that the preparation of the resistance film can be completed during the process of manufacturing the liquid crystal display panel, which simplifies the preparation process of the resistance film.

Certainly, the transparent heating unit is not limited to the resistive film, and may also be other devices known by those skilled in the art to realize the function of heating the liquid crystal material.

In the above embodiments, the shape of the transparent heating unit 12 can be the same as that of the opposite surface of the liquid crystal display panel 11 and the backlight 13, so that the transparent heating unit 12 can heat the liquid crystal material uniformly.

In the foregoing embodiment, the liquid crystal display device may also include a temperature sensor 21, a controller 22, a heating driver 23, and a heating power supply 24 as shown in FIG. And the transparent heating unit 12 is electrically connected with the heating driver 23 . Wherein, the temperature sensor 21 is used to detect the ambient temperature of the environment where the liquid crystal display panel 11 is located; the controller 22 is used to send a control signal to the heating driver 23 when the ambient temperature detected by the temperature sensor 21 is lower than the temperature threshold; The driver 23 is used to control the heating power supply 24 to supply power to the transparent heating unit 12 according to the control signal, so as to heat the liquid crystal material in the liquid crystal display panel.

Since the temperature sensor 21 can detect the ambient temperature of the environment where the liquid crystal display panel 11 is located, the controller 22 sends a control signal to the heating driver 23 when the controller 22 determines that the ambient temperature detected by the temperature sensor 21 is lower than the temperature threshold, and the heating driver 23 can be controlled according to the temperature. The signal controls the heating power supply 24 to supply power to the transparent heating unit 12 to heat the liquid crystal material in the liquid crystal display panel 11 , so that the heating process can be automated.

In the above embodiments, the temperature sensor may be a thermistor. Since the thermistor is more sensitive to the ambient temperature, the temperature sensor can detect the ambient temperature more accurately.

In the above-mentioned embodiment, the liquid crystal display device may also include a level conversion circuit 3 as shown in FIG. The value is converted to the level required by the controller 22.

The level conversion circuit 3 includes a power supply 31, a voltage dividing resistor 32 and a differential amplifier 34; the power supply 31, thermistor 33 and the voltage dividing resistor 32 are connected in series; the reverse input terminal of the differential amplifier 34 is electrically connected to the negative pole of the power supply 31; The position where the resistor 33 and the voltage dividing resistor 32 are electrically connected to each other is electrically connected to the positive input end of the differential amplifier 34 ; the output end of the differential amplifier 34 is electrically connected to the controller 22 .

By setting the level conversion circuit 3 , the temperature signal level detected by the thermistor 33 can be matched with the input level of the controller 22 .

In the above embodiments, the controller 22 and the heating driver 23 can be arranged on a PCB (Printed Circuit Board, printed circuit board), which can make the liquid crystal display device more integrated and have a smaller size.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. All should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (8)

1. A liquid crystal display device, comprising a liquid crystal display panel and a backlight, characterized in that a transparent heating unit for heating liquid crystal material in the liquid crystal display panel is arranged between the liquid crystal display panel and the backlight. 2. The liquid crystal display device according to claim 1, wherein the transparent heating unit is a resistive film. 3. The liquid crystal display device according to claim 2, wherein the resistive film is directly formed on a side of the liquid crystal display panel opposite to the backlight source. 4 . The liquid crystal display device according to claim 1 , wherein the shape of the transparent heating unit is the same as that of the surface opposite to the liquid crystal display panel and the backlight. 5. The liquid crystal display device according to claim 1, further comprising a temperature sensor, a controller, a heating driver and a heating power supply; The controller is electrically connected to the temperature sensor and the heating driver, and the heating power supply and the transparent heating unit are electrically connected to the heating driver; The temperature sensor is used to detect the ambient temperature of the environment where the liquid crystal display panel is located; The controller is configured to send a control signal to the heating driver when determining that the ambient temperature detected by the temperature sensor is lower than a temperature threshold; The heating driver is used to control the heating power supply to supply power to the transparent heating unit according to the control signal, so as to heat the liquid crystal material in the liquid crystal display panel. 6. The liquid crystal display device according to claim 5, wherein the temperature sensor is a thermistor. 7. The liquid crystal display device according to claim 6, further comprising a level conversion circuit, arranged between the thermistor and the controller, for changing the resistance value of the thermistor to converted to the level required by the controller; The level conversion circuit includes a power supply, a voltage dividing resistor and a differential amplifier; the power supply, the thermistor and the voltage dividing resistor are connected in series; the reverse input terminal of the differential amplifier is electrically connected to the negative pole of the power supply ; The position where the thermistor and the voltage dividing resistor are electrically connected to each other is electrically connected to the positive input end of the differential amplifier; the output end of the differential amplifier is electrically connected to the controller. 8 . The liquid crystal display device according to claim 5 , wherein the controller and the heating driver are arranged on a PCB.

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