KR100976559B1 - LCD and its driving method - Google Patents

Abstract

The present invention relates to a liquid crystal display and a driving method thereof capable of accurately detecting the temperature of the liquid crystal panel to compensate for the temperature deviation.

A liquid crystal display device according to the present invention includes a liquid crystal panel; A heat conductive layer for adjusting the temperature of the liquid crystal panel according to an applied current; A temperature sensor for sensing a temperature of the liquid crystal panel; A driving circuit unit for comparing the output current of the temperature sensor with a preset reference current and adjusting the strength of the current applied to the thermal conductive layer according to the comparison result; A parallel wiring is formed between the temperature sensor and the driving circuit unit to input an output current of the temperature sensor to the driving circuit unit.

Description

Liquid crystal display and its driving method {LIQUID CRYSTAL DISPLAY DEVICE AND METHOD OF DRIVING THE SAME}             

1 is a cross-sectional view showing a conventional liquid crystal display module.

2 is a view showing a liquid crystal display module according to another embodiment of the prior art.

3 is a view showing in detail the heat conduction portion shown in FIG.

4 is a view showing a liquid crystal display device according to a first embodiment of the present invention.

5 is a view showing in detail the heat conduction portion shown in FIG.

6 is a view showing a liquid crystal display device according to a second embodiment of the present invention.

FIG. 7 is a view showing details of the parallel wiring shown in FIG. 6; FIG.

FIG. 8A is a diagram illustrating a parallel wire cut for controlling a current value output from the temperature sensor shown in FIG. 6. FIG.

FIG. 8B is an equivalent representation of the parallel wiring shown in FIG. 8A. FIG.

9 is a view showing a liquid crystal display device according to a third embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

6,106,206,306: liquid crystal panel 30,130,230: heat conduction part                 

32,132: support substrate 34,134,330: thermal conductive layer

36,136: heat conduction line 110,210,310: sealant

140,240,340: Temperature sensor 150,250,350: Drive circuit part

242,342 Parallel wiring 320 Insulation film

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device and a driving method thereof, and more particularly, to a liquid crystal display device and a driving method thereof capable of accurately detecting a temperature of a liquid crystal panel to compensate for a temperature deviation.

A general liquid crystal display device is composed of a liquid crystal display module and a driving circuit portion for driving the liquid crystal display module.

The liquid crystal display module includes a liquid crystal panel in which liquid crystal cells are arranged in a matrix form between two glass substrates, and a backlight unit that irradiates light to the liquid crystal panel. In addition, in the liquid crystal display module, optical sheets for vertically raising light traveling from the backlight unit toward the liquid crystal panel are arranged. The liquid crystal panel, the backlight unit and the optical sheet must be fastened in an integrated form to prevent light loss and must be protected from damage by external impact. To this end, a case for a liquid crystal display device formed to surround a backlight unit and an optical sheet including an edge of a liquid crystal panel is provided. The liquid crystal display module is mounted on a notebook personal computer, a mobile vehicle, an aircraft, and the like, which is manufactured in a size of a notebook so that a user can use information between mobiles.

1 is a schematic cross-sectional view of a conventional liquid crystal display module.

Referring to FIG. 1, the conventional liquid crystal display module 1 includes a support main 14, a backlight unit and a liquid crystal panel 6 stacked inside the support main 14, and a liquid crystal panel 6. A case top 2 is provided to surround the edges of the c) and the side surfaces of the support main 14.

The liquid crystal panel 6 includes a spacer (not shown) for injecting liquid crystal between the upper substrate 3 and the lower substrate 5 and for maintaining a constant gap between the upper substrate 3 and the lower substrate 5. . In the upper substrate 3 of the liquid crystal panel 6, a color filter, a common electrode, a black matrix, and the like, which are not shown, are formed. In addition, signal lines such as data lines and gate lines (not shown) are formed on the lower substrate 5 of the liquid crystal panel 6, and thin film transistors (“TFT”) are formed at the intersections of the data lines and the gate lines. Is formed. The TFT switches the data signal to be transmitted from the data line toward the liquid crystal cell in response to the scan signal (gate pulse) from the gate line. The pixel electrode is formed in the pixel region between the data line and the gate line. In addition, a tape pad region for connecting data lines and gate lines, respectively, is formed at one side of the lower substrate 5, and the tape pad region is not shown in which a driver integrated circuit for applying a driving signal to the TFT is mounted. Tape Carrier Package is attached. This tape carrier package supplies the data signal from the driver integrated circuit to the data lines. The scan signal is also supplied to the gate lines.

The upper polarizing sheet is attached to the upper substrate 3 of the liquid crystal panel 6, and the lower polarizing sheet is attached to the rear surface of the lower substrate 5.

The support main 14 is a mold, and the side wall surface thereof is formed into a stepped stepped surface, and the stepped surface is formed with a seating portion on which a plurality of optical sheets 8 are seated. The innermost bottom layer of the support main 14 includes a reflective sheet 12, a light guide plate 10, a plurality of optical sheets 8, and a lamp housing 23 and a lamp 21 mounted on the lamp housing 23. And a liquid crystal panel 6 composed of a backlight unit and an upper substrate 3 and a lower substrate 5.

The backlight unit includes a lamp 21 for irradiating light to the liquid crystal panel 6, a lamp housing 23 surrounding the lamp 21, and a light incident from the lamp 21 to the liquid crystal panel 6. A light guide plate 10, a reflective sheet 12 disposed on the rear surface of the light guide plate 10, and a plurality of optical sheets 8 stacked on the light guide plate 10 are provided.

The lamp 21 mainly uses a cold cathode fluorescent lamp, and the light generated by the lamp 21 is incident on the light guide plate 10 through the incident surface of the light guide plate 10.

The lamp housing 23 has a reflecting surface formed on an inner surface thereof and installed to surround the lamp 21 to reflect light from the lamp 21 toward the incident surface of the light guide plate 10.

The reflective sheet 12 is positioned on the rear surface of the light guide plate 10 to reduce light loss by re-reflecting light incident to the light guide plate 10 toward the light guide plate 10. That is, when light from the lamp 21 is incident on the light guide plate 10, the light propagated toward the lower surface and the side surface of the light guide plate 10 is reflected by the reflective sheet 12 and travels toward the liquid crystal panel 6.

The light guide plate 10 converts line light incident from the lamp 21 into surface light and guides the light to the liquid crystal panel 6. The lower surface of the light guide plate 10 is provided with a printed pattern so that the light beam passing through the light incident portion is reflected at a predetermined inclination angle from the rear surface which is the inclined surface and proceeds uniformly toward the exit surface. At this time, the light propagated to the lower surface and the side surface of the light guide plate 10 is reflected by the reflective sheet 10 to proceed toward the exit surface. Light emitted via the light guide plate 10 is incident on the liquid crystal panel 6 via the plurality of optical sheets 8.

When the light incident on the liquid crystal panel 6 is vertical, the light efficiency is increased. The plurality of optical sheets 8 generates light emitted from the light guide plate 10 vertically to improve light efficiency. To this end, the lower diffusion sheet for diffusing the light emitted from the light guide plate 10 to the entire region and the first and second prism sheets for raising the propagation angle of the light diffused by the lower diffusion sheet perpendicular to the liquid crystal panel 6. And an upper diffusion sheet for diffusing light via the first and second prism sheets. Accordingly, the light emitted from the light guide plate 10 is incident on the liquid crystal panel 6 via the plurality of optical sheets 8.

The case top 2 is manufactured in the form of a square strip having a flat portion and a side portion bent at a right angle. The case top 2 surrounds the edge of the liquid crystal panel 6 and the support main 14.

However, in such a liquid crystal display module, when the liquid crystal panel 6 is exposed to an environment of a predetermined temperature or less, for example, about 0 degrees to about 40 degrees, liquid crystals of the liquid crystal panel 6 are cooled to generate bubbles. Due to this bubble, the dielectric anisotropy of the liquid crystal is limited, and thus there is a problem that normal image expression is not achieved. In order to solve this problem, as shown in FIG. 2, the heat conduction part 30 is provided on the rear surface of the liquid crystal panel 6.

2 is a diagram illustrating a liquid crystal display module according to another exemplary embodiment.

Referring to FIG. 2, the liquid crystal display module according to another exemplary embodiment includes the same components except that the heat conductive part 30 is added as compared to the liquid crystal display module illustrated in FIG. 1. Accordingly, the description of the remaining components except for the heat conductive portion 30 will be omitted below.

The heat conductive portion 30 is bonded to the lower polarizer not shown through the adhesive. As shown in FIG. 3, the heat conductive part 30 includes a heat conductive layer 34 formed on the support substrate 32 and the support substrate 32, and a silver on the conductive metal in the outer region of the heat conductive layer 34. A heat conduction line 36 having a structure in which (Ag) is laminated is provided.

The support substrate 32 is formed of the same glass substrate as the upper and lower substrates of the liquid crystal panel 6 to support the thermal conductive layer 34. The thermal conductive line 36 supplies a voltage generated from a separate voltage source (not shown) to the thermal conductive layer 34.

The thermal conductive layer 34 prevents cooling of the liquid crystal by supplying heat generated by the supplied voltage to the liquid crystal panel 6. Specifically, when the liquid crystal panel 6 is exposed to an environment of a predetermined temperature or less, for example, about 0 degrees to about 40 degrees, the liquid crystal of the liquid crystal panel 6 is cooled to generate bubbles. This bubble limits the dielectric anisotropy of the liquid crystal and prevents normal image expression. In order to prevent this, the thermal conductive layer 34 generates sheet resistance by the voltage supplied from the voltage source, and the heat generated by the sheet resistance serves as a heater. As a result, the heat generated in the heat conductive layer 34 is supplied to the liquid crystal panel 6, thereby preventing the liquid crystal from being cooled and preventing bubble generation. Here, the thermal conductive layer 34 is an indium-tin oxide (ITO), which is a transparent conductive material. Etc. are used.

However, since the liquid crystal display module according to another exemplary embodiment of the present invention cannot accurately detect the temperature of the liquid crystal panel 6, there is a problem in that the temperature deviation with respect to the liquid crystal panel 6 cannot be compensated.

Accordingly, an object of the present invention is to provide a liquid crystal display and a driving method thereof capable of accurately detecting the temperature of the liquid crystal panel to compensate for the temperature deviation.

In order to achieve the above object, the liquid crystal display device according to an embodiment of the present invention comprises a liquid crystal panel; A heat conductive layer for adjusting the temperature of the liquid crystal panel according to an applied current; A temperature sensor for sensing a temperature of the liquid crystal panel; A driving circuit unit for comparing the output current of the temperature sensor with a preset reference current and adjusting the strength of the current applied to the thermal conductive layer according to the comparison result; A parallel wiring is formed between the temperature sensor and the driving circuit unit to input an output current of the temperature sensor to the driving circuit unit.

In the liquid crystal display device, the liquid crystal panel includes an upper substrate and a lower substrate; It includes a liquid crystal formed between the upper substrate and the lower substrate.

In the liquid crystal display, the thermal conductive layer includes a transparent conductive layer formed on any one of the upper substrate and the lower substrate.

In the liquid crystal display, the thermal conductive layer further includes an insulating layer formed on the transparent conductive layer.

In the liquid crystal display device, the temperature sensor and the parallel wiring are formed on any one of the upper substrate and the lower substrate.

A liquid crystal display according to an embodiment of the present invention includes a temperature sensor for sensing the temperature of the liquid crystal panel; A temperature controller for adjusting the temperature of the liquid crystal panel according to the output current of the temperature sensor; And a parallel resistor formed between the temperature sensor and the temperature controller.

A method of driving a liquid crystal display according to an embodiment of the present invention includes the steps of sensing the temperature of the liquid crystal panel as the current of the temperature sensor; Adjusting the current of the temperature sensor according to a preset reference current by the number of wires of the parallel wiring; And adjusting the temperature of the liquid crystal panel by controlling a current applied to the thermal conductive layer according to the current of the temperature sensor adjusted by the number of wires of the parallel wirings.

In the method of driving the liquid crystal display device, adjusting the current of the temperature sensor by the number of wires of the parallel wires includes cutting the wires of the parallel wires by laser cutting.

A method of driving a liquid crystal display according to an embodiment of the present invention includes the steps of sensing the temperature of the liquid crystal panel as the current of the temperature sensor; Correcting the current of the temperature sensor to a parallel resistance value according to a preset reference current; And adjusting the temperature of the liquid crystal panel by using the corrected current.

Other objects and features of the present invention in addition to the above object will be apparent from the description of the embodiments with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 4 to 9.

4 is a view showing a liquid crystal display device according to a first embodiment of the present invention.

Referring to FIG. 4, the liquid crystal display according to the first exemplary embodiment of the present invention includes a liquid crystal panel 106, a heat conducting unit 130 provided on a rear surface of the liquid crystal panel 106, and a liquid crystal panel 106. A driving circuit unit 150 for driving the installed temperature sensor 140 and the heat conducting unit 130 is provided.

The liquid crystal panel 106 includes a spacer (not shown) for injecting liquid crystal between the upper substrate 103 and the lower substrate 105 to maintain a constant gap between the upper substrate 103 and the lower substrate 105. . The upper substrate 103 of the liquid crystal panel 106 is formed with a color filter, a common electrode, a black matrix, and the like, which are not shown. In addition, signal lines such as data lines and gate lines (not shown) are formed on the lower substrate 105 of the liquid crystal panel 106, and thin film transistors ("TFTs") are formed at the intersections of the data lines and the gate lines. Is formed. The TFT switches the data signal to be transmitted from the data line toward the liquid crystal cell in response to the scan signal (gate pulse) from the gate line. The pixel electrode is formed in the pixel region between the data line and the gate line. In addition, a tape pad region is formed at one side of the lower substrate 105 to connect the data lines and the gate lines, respectively. Tape Carrier Package is attached. This tape carrier package supplies the data signal from the driver integrated circuit to the data lines. The scan signal is also supplied to the gate lines. In this case, the upper substrate 103 and the lower substrate 105 are bonded by the seal member 110. The upper polarizing sheet is attached to the upper substrate 103 of the liquid crystal panel 106, and the lower polarizing sheet is attached to the rear surface of the lower substrate 105.

The heat conductive part 130 is bonded to the lower polarizer not shown through the adhesive. As shown in FIG. 5, the heat conductive part 130 includes a heat conductive layer 134 formed on the support substrate 132 and the support substrate 132, and on the conductive metal in the outer region of the heat conductive layer 134. A heat conduction line 136 having a structure in which Ag is stacked is provided.

The support substrate 132 is formed of the same glass substrate as the upper and lower substrates of the liquid crystal panel 106 to support the thermal conductive layer 134. The thermal conductive line 136 supplies the voltage generated from the driving circuit unit 150 to the thermal conductive layer 134.

The thermal conductive layer 134 prevents the liquid crystal from being cooled by supplying heat generated by the supplied voltage to the liquid crystal panel 106. Specifically, when the liquid crystal panel 106 is exposed to an environment of a predetermined temperature or less, for example, about 0 degrees to about 40 degrees, the liquid crystal of the liquid crystal panel 106 is cooled to generate bubbles. This bubble limits the dielectric anisotropy of the liquid crystal and prevents normal image expression. In order to prevent this, the thermal conductive layer 134 generates sheet resistance by the voltage supplied from the driving circuit unit 150, and the heat generated by the sheet resistance serves as a heater. As a result, the heat generated in the heat conductive layer 134 is supplied to the liquid crystal panel 106, thereby preventing the liquid crystal from being cooled and preventing the occurrence of bubbles. Here, the thermal conductive layer 134 is indium tin oxide (ITO), which is a transparent conductive material. Etc. are used.

The temperature sensor 140 is installed at one side of the lower substrate 105 to sense the temperature of the liquid crystal panel 106. The temperature sensor 140 is composed of a plurality of thin film transistors. Accordingly, the temperature of the liquid crystal panel 106 is sensed by the current output from the thin film transistor using the temperature dependency of the thin film transistor. At this time, when the temperature of the liquid crystal panel 106 is high, the amount of output current output from the temperature sensor 140 increases, and when the temperature of the liquid crystal panel 106 is low, the amount of output current output from the temperature sensor 140 decreases. The amount of current output from the temperature sensor 140 is supplied to the driving circuit unit 150.

The driving circuit unit 150 detects the temperature of the liquid crystal panel 106 based on the amount of current supplied from the temperature sensor 140. In other words, the temperature of the liquid crystal panel 106 is detected by comparing the current supplied from the temperature sensor 106 with a preset reference current. At this time, if the temperature of the liquid crystal panel 106 detected by the driving circuit unit 150 is less than or equal to a predetermined reference current, the driving circuit unit 150 supplies a voltage to the thermal conductive unit 130 to adjust the temperature of the liquid crystal panel 106. Done. If the temperature of the liquid crystal panel 106 detected by the driving circuit unit 150 is greater than or equal to a preset reference current, the driving circuit unit 150 does not operate. On the other hand, the driving circuit unit 150 supplies a predetermined amount of voltage so that the temperature sensor 140 can operate. Here, the driving circuit unit 150 and the thermal conductive unit 130 may be represented by a temperature controller.

In the liquid crystal display device according to the first exemplary embodiment of the present invention, the temperature sensor 140 is installed in the liquid crystal panel 106 to maintain the temperature of the liquid crystal panel 106 at a constant temperature at all times. As a result, the temperature characteristic of the liquid crystal panel 106 can be prevented from being lowered.

However, in the liquid crystal display device according to the first exemplary embodiment of the present invention, since the temperature sensor 140 is configured using a plurality of thin film transistors, the performance of the thin film transistors is degraded due to the process variation when forming the thin film transistors. There is a disadvantage that the temperature of the panel 106 cannot be detected accurately. In order to solve this problem, the resistance value of the driving circuit unit 150 needs to be changed, which causes a complexity of the driving circuit unit 150. Accordingly, a liquid crystal display as shown in FIG. 6 is proposed.

6 is a view showing a liquid crystal display device according to a second embodiment of the present invention.

Referring to FIG. 6, the liquid crystal display according to the second exemplary embodiment of the present invention includes a liquid crystal panel 206, a heat conductive portion 230 provided on a rear surface of the liquid crystal panel 206, and a liquid crystal panel 206. The temperature sensor 240 and the parallel wiring 242 which are provided, and the drive circuit part 250 for driving the heat conduction part 230 are provided.

The liquid crystal panel 206 includes a spacer (not shown) for injecting liquid crystal between the upper substrate 203 and the lower substrate 205 and for maintaining a constant gap between the upper substrate 203 and the lower substrate 205. . The upper substrate 203 of the liquid crystal panel 206 is formed with a color filter, a common electrode, a black matrix, and the like, which are not shown. The lower substrate 205 of the liquid crystal panel 206 is provided with signal wirings such as data lines and gate lines (not shown), and a thin film transistor (“TFT”) at an intersection of the data lines and the gate lines. Is formed. The TFT switches the data signal to be transmitted from the data line toward the liquid crystal cell in response to the scan signal (gate pulse) from the gate line. The pixel electrode is formed in the pixel region between the data line and the gate line. In addition, a tape pad region is formed at one side of the lower substrate 205 to connect the data lines and the gate lines. The tape pad region is not shown in which a driver integrated circuit for applying a driving signal to the TFT is mounted. Tape Carrier Package is attached. This tape carrier package supplies the data signal from the driver integrated circuit to the data lines. The scan signal is also supplied to the gate lines. At this time, the upper substrate 203 and the lower substrate 205 are bonded by the seal member 210. The upper polarizing sheet is attached to the upper substrate 203 of the liquid crystal panel 206, and the lower polarizing sheet is attached to the rear surface of the lower substrate 205.

The heat conductive part 230 is bonded to the lower polarizer not shown through the adhesive. As shown in FIG. 5, the heat conduction unit 230 includes a heat conduction layer 134 formed on the support substrate 132 and the support substrate 132, and the silver on the conductive metal in the outer region of the heat conduction layer 134. A heat conduction line 136 having a structure in which Ag is stacked is provided. Since the heat conductive part 230 is described in the first embodiment of the present invention, a detailed description thereof will be omitted below.

The temperature sensor 240 is installed at one side of the lower substrate 205 to sense the temperature of the liquid crystal panel 206. The temperature sensor 240 is composed of a plurality of thin film transistors. Accordingly, the temperature of the liquid crystal panel 206 is sensed by the current output from the thin film transistor using the temperature dependency of the thin film transistor. At this time, when the temperature of the liquid crystal panel 206 is high, the amount of output current output from the temperature sensor 240 increases, and when the temperature of the liquid crystal panel 206 is low, the amount of output current output from the temperature sensor 240 decreases. The amount of current output from the temperature sensor 240 is supplied to the parallel wiring 242.

The parallel wiring 242 is composed of a plurality of conductive materials in parallel as shown in FIG. 7 (that is, equivalently parallel resistance). The parallel wiring 242 is a temperature having different resistance values due to process variations. The current output from the temperature sensor 240 is controlled to have an appropriate resistance value with respect to the output of the sensor 240 and is supplied to the driving circuit unit 250. In other words, even when different currents are output due to process variation in forming the temperature sensor 240, the correct current can be output from the temperature sensor 240 under the same conditions by controlling the resistance value of the parallel wiring 242 to which the output is supplied. As a result, the temperature of the liquid crystal panel 206 can be accurately detected. At this time, the method of controlling the resistance value of the parallel wiring 242 is to cut the parallel resistance so that the reference current is outputted by using laser cutting. Here, the number of wires of the parallel wires 242 is formed so that the temperature sensor 240 can output the maximum current.

In detail, it is assumed that the current output from the temperature sensor 240 should be outputted with Ia, but more Ib is outputted than Ia due to the process variation when the temperature sensor 240 is formed. And, it is assumed that the number of wirings of the parallel wiring 242 is formed such that n (n is an integer greater than 1) so that the temperature sensor 240 can output the maximum current. At this time, when the number of wirings of the parallel wiring 242 is formed, the current of Ib is output from the temperature sensor 240, so that the parallel wiring 242 as shown in FIG. 8A using laser cutting to output the reference current. Many of the n number of wirings are cut off. Accordingly, as can be seen in the equivalent resistance circuit shown in FIG. 8B, the resistance value of the parallel wiring 242 is increased so that the amount of current to be output from the temperature sensor 240 becomes Ia. At this time, the number of wirings to be cut out of the n wirings using laser cutting is set so that the reference current has a resistance value that can be output from the temperature sensor 240. Accordingly, the deviation of the current output from the temperature sensor 240 can be compensated for.                     

The driving circuit 250 detects the temperature of the liquid crystal panel 206 based on the compensated current output from the temperature sensor 240 by the parallel wiring 242. In other words, the temperature of the liquid crystal panel 206 is detected by comparing the compensated current supplied from the temperature sensor 240 with a preset reference current. At this time, if the temperature of the liquid crystal panel 206 detected by the driving circuit unit 250 is less than or equal to a predetermined reference current, the driving circuit unit 250 supplies a voltage to the thermal conductive unit 230 to adjust the temperature of the liquid crystal panel 206. Done. If the temperature of the liquid crystal panel 206 detected by the driving circuit unit 250 is greater than or equal to a preset reference current, the driving circuit unit 250 does not operate. On the other hand, the driving circuit unit 250 supplies a predetermined amount of voltage so that the temperature sensor 240 can operate. Here, the driving circuit 250 and the heat conduction unit 230 may be represented by a temperature controller.

The liquid crystal display according to the second exemplary embodiment of the present invention has a current value output from the temperature sensor 240 due to process variation when the temperature sensor 240 is formed to maintain an appropriate temperature in the liquid crystal panel 206. Even if a deviation occurs, the parallel wiring 242 can be used to control the current value compensated from the temperature sensor 240 to be output. Accordingly, the temperature of the liquid crystal panel 206 can be kept constant at all times.

However, the liquid crystal display device according to the second embodiment of the present invention is formed of a glass substrate having a thick support substrate for supporting the thermal conductive layer. This glass substrate has a disadvantage in that the weight and thickness of the entire liquid crystal display device are increased. Accordingly, a liquid crystal display as shown in FIG. 9 is proposed.

9 is a view showing a liquid crystal display device according to a third embodiment of the present invention.                     

9, the liquid crystal display according to the third exemplary embodiment of the present invention is formed on the liquid crystal panel 306, the thermal conductive layer 330 formed between the liquid crystal panel 306, and the thermal conductive layer 330. An insulating film 320, a temperature sensor 340 and a parallel wiring 342 provided on the insulating film 320, and a driving circuit unit 350 for driving the thermal conductive layer 330.

In the liquid crystal display according to the third exemplary embodiment of the present invention, the heat conductive layer 330 is formed on the lower substrate 305 so that the liquid crystal display can be made thinner and lighter. The liquid crystal display device according to the third embodiment of the present invention is driven in the same manner as the liquid crystal display device according to the second embodiment of the present invention. Accordingly, in the liquid crystal display according to the third embodiment of the present invention, the current value output from the temperature sensor 340 due to the process deviation when the temperature sensor 340 is formed to maintain the proper temperature in the liquid crystal panel 306. Even if a deviation occurs, it is possible to control the current value compensated from the temperature sensor 240 by using the parallel wiring 342. Therefore, the temperature of the liquid crystal panel 306 can be kept constant at all times.

As described above, according to the liquid crystal display and the driving method thereof according to the embodiment of the present invention, a temperature sensor is formed to sense the temperature of the liquid crystal panel, and parallel wirings are formed on the liquid crystal panel. At this time, by cutting the wiring of the parallel wiring by laser cutting, it is possible to compensate for the current changed by the process variation when forming the temperature sensor to keep the temperature of the liquid crystal panel constant at all times.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

Claims (9)

A liquid crystal panel; A heat conductive layer for adjusting the temperature of the liquid crystal panel according to an applied current; A temperature sensor for sensing a temperature of the liquid crystal panel; A driving circuit unit for comparing the output current of the temperature sensor with a preset reference current and adjusting the strength of the current applied to the thermal conductive layer according to the comparison result; And a parallel wiring formed between the temperature sensor and the driving circuit part to input an output current of the temperature sensor to the driving circuit part. The method of claim 1, The liquid crystal panel, An upper substrate and a lower substrate; And a liquid crystal formed between the upper substrate and the lower substrate. The method of claim 2, The thermal conductive layer, And a transparent conductive layer formed on any one of the upper substrate and the lower substrate. The method of claim 3, wherein The thermal conductive layer, And an insulating layer formed on the transparent conductive layer. The method of claim 2, The temperature sensor and the parallel wiring, And an upper substrate and a lower substrate. A temperature sensor for sensing a temperature of the liquid crystal panel; A temperature controller for adjusting the temperature of the liquid crystal panel according to the output current of the temperature sensor; And a parallel resistor formed between the temperature sensor and the temperature controller. Sensing the temperature of the liquid crystal panel by the current of the temperature sensor; Adjusting the current of the temperature sensor according to a preset reference current by the number of wires of the parallel wiring; And controlling the temperature of the liquid crystal panel by controlling the current applied to the thermal conductive layer according to the current of the temperature sensor adjusted by the number of wirings of the parallel wirings. The method of claim 7, wherein Adjusting the current of the temperature sensor to the number of wiring of the parallel wiring, And cutting the wiring of the parallel wiring by laser cutting. Sensing the temperature of the liquid crystal panel by the current of the temperature sensor; Correcting the current of the temperature sensor to a parallel resistance value according to a preset reference current; And adjusting the temperature of the liquid crystal panel by using the corrected current.

Images