TWI763239B - Heating pad controlling circuit - Google Patents

Abstract

A heating pad controlling circuit applies to a display with a display area and a non-display area. The heating pad controlling circuit includes a temperature sensing circuit, a heating pad, a boost circuit and a switch circuit. The temperature sensing circuit senses an environment temperature of the gate-on-array circuit. The heating pad is disposed in the non-display area. The boost circuit is connected with the temperature sensing circuit and the heating pad. The switch circuit is connected between the heating pad and the boost circuit. When the temperature sensing circuit determines that the environment temperature is lower than the threshold value, the temperature sensing circuit outputs a first signal to the switch circuit and the boost circuit, the switch circuit is turned on and the boost circuit outputs a voltage to the heating pad.

Description

Heating pad control circuit

The present invention utilizes a temperature control circuit, a heating pad and a booster circuit to keep the ambient temperature of the gate driving circuit constant and the heating pad control circuit to maintain the normal operation of the gate driving circuit.

The demand for monitors that display images is increasing day by day, and people's requirements for display quality are also increasing. The operating speed of the gate drive circuits used in the monitors must also be improved.

Among them, the gate drive circuit is composed of multiple transistors. The transistors cannot operate normally at low temperatures (usually below 0°C). Of course, there are also special types of transistors that can adapt to low temperatures and still operate normally. The type of transistor will increase the manufacturing cost of the gate drive circuit. Therefore, the gate driving circuit needs to operate normally at a normal ambient temperature to maintain high-speed operation, and maintaining the ambient temperature of the gate driving circuit is an extremely important issue.

In view of the foregoing, the inventors of the present invention have considered and designed a heating pad control circuit, in order to improve the deficiencies of the prior art, thereby enhancing the implementation and utilization in the industry.

In view of the above-mentioned conventional problems, an object of the present invention is to provide a heating pad control circuit for solving the problems faced in the prior art.

Based on the above objects, the present invention provides a heating pad control circuit, which is applied to a display. The display has a display area and a non-display area surrounding the display area. The display includes a temperature sensing circuit, a heating pad, a boost circuit and a switching circuit. The temperature sensing circuit senses the ambient temperature of the gate driving circuit. The heating pad is arranged in the non-display area. The boost circuit is coupled to the temperature sensing circuit and the heating pad. A switching circuit is coupled between the heating pad and the boost circuit. When the temperature sensing circuit determines that the ambient temperature is lower than the preset value, the temperature sensing circuit outputs a first signal to the switching circuit and the boosting circuit, the switching circuit turns on the boosting circuit and the heating pad, and the boosting circuit outputs a voltage to the heating pad.

In an embodiment of the present invention, the heating pad control circuit further includes a power supply circuit, which is coupled to the temperature sensing circuit and the boosting circuit, and the power supply circuit provides an operating voltage to the temperature sensing circuit and the boosting circuit.

In an embodiment of the present invention, the heating pad control circuit further includes a clock controller, the clock controller is coupled to the power supply circuit and the temperature sensing circuit, the temperature sensing circuit outputs the second signal to the clock controller, and the clock controls The device receives the working voltage, and the clock controller controls the output of the display screen according to the first signal and the second signal.

In an embodiment of the present invention, the gate driving circuit includes a first gate driving circuit, and the first gate driving circuit is disposed on one side of the display.

In the embodiment of the present invention, the gate driving circuit further includes a second gate driving circuit, the first gate driving circuit and the second gate driving circuit are respectively located on opposite sides of the display, when the first gate driving circuit and When the temperature sensing circuit corresponding to the second gate driving circuit outputs the second signal to the clock controller and the switching circuits corresponding to the first gate driving circuit and the second gate driving circuit are turned on, the clock controller outputs Display the screen.

In the embodiment of the present invention, the heating pads are respectively arranged on the first gate driving circuit and the second gate driving circuit, and the temperature sensing circuits are respectively arranged on the first gate driving circuit and the second gate driving circuit on the circuit.

In the embodiment of the present invention, the present invention further includes a constant voltage feedback circuit, a programmable constant temperature control circuit and a constant current control circuit, the constant voltage feedback circuit detects the ambient temperature, the programmable constant temperature control circuit sets the required temperature, The current control circuit adjusts the ambient temperature according to the desired temperature.

As mentioned above, the heating pad control circuit of the present invention utilizes the temperature control circuit, the heating pad and the boosting circuit to keep the ambient temperature of the gate driving circuit constant and operate normally.

B1, B2: boost circuit

CN1, CN2: engaging part

DS: Display area

EN_sensor1: The first sensing signal

EN_sensor2: The second sensing signal

FAULT1: The first switching signal

FAULT2: The second switching signal

GOA1: The first gate drive circuit

GOA2: The second gate driver circuit

HP1, HP2: Heating pad

NDS: non-display area

PW: Power circuit

SC1, SC2: temperature sensing circuit

SW1, SW2: switching circuit

TCON1: Clock Controller

TCON_OUT: Display signal

Tcon_ready: ready signal

1: Heating pad control circuit

FIG. 1 is a first aspect diagram of the display of the present invention.

FIG. 2 is a configuration diagram of the heating pad control circuit of the present invention.

FIG. 3 is a signal waveform diagram of the heating pad control circuit in the first state of the present invention.

FIG. 4 is a signal waveform diagram of the second state of the heating pad control circuit of the present invention.

The advantages, features, and technical means of achieving the present invention will be more easily understood by being described in more detail with reference to the exemplary embodiments and the accompanying drawings, and the present invention may be implemented in different forms, so it should not be construed as being limited to what is described herein. Rather, the embodiments are provided so that this disclosure will be thorough, complete and complete to convey the scope of the invention to those of ordinary skill in the art, and the invention will only be appended Defined by the scope of the patent application.

It will be understood that although the terms "first", "second", etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections You should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer and/or section from another element, component, region, layer and/or section. Thus, "first element", "first feature", "first region", "first layer" and/or "first portion" discussed below may be referred to as "second element", "second feature" , "Second Area", "Second Layer" and/or "Second Section" without departing from the spirit and teachings of the present invention.

Additionally, the terms "comprising" and/or "comprising" refer to the presence of stated features, regions, integers, steps, operations, elements and/or components, but do not exclude one or more other features, regions, integers, steps, operations , elements, components and/or the presence or addition of combinations thereof.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be construed as having definitions consistent with their meanings in the context of the related art and the present invention, and will not be construed as idealized or overly formal meaning, unless expressly defined as such herein.

Please refer to FIG. 1 , which is a first aspect diagram of the display of the present invention. As shown in FIG. 1, the display of the present invention has a display area DS and a non-display area NDS. The display area DS has a plurality of pixels to display images. The first gate driving circuit GOA1 and the second gate driving circuit GOA2 are respectively arranged in the non-display area NDS and located on opposite sides of the display. The heating pad control circuit 1 of the present invention is arranged In the non-display area NDS, the output of the display screen is controlled to the first gate driving circuit GOA1 and the second gate driving circuit GOA2. Specifically, the heating pad control circuit 1 of the present invention has temperature sensing circuits SC1 and SC2 and heating pads HP1 and HP2, and the temperature sensing circuit SC1 and the heating pad HP1 are disposed adjacent to the first A gate driving circuit GOA1, the temperature sensing circuit SC1 and the heating pad HP1 can be integrated into a small block or separated from each other; the temperature sensing circuit SC2 and the heating pad HP2 are arranged adjacent to the second gate driving circuit GOA2, the temperature sensing circuit SC2 and heating pad HP2 can be integrated into small blocks or separated from each other. In addition, the heating pad control circuit 1 of the present invention has engaging parts CN1 and CN2 to fit in the non-display area NDS of the display.

Please refer to FIG. 2 , which is a configuration diagram of the heating pad control circuit of the present invention. As shown in FIG. 2, the heating pad control circuit 1 of the present invention is provided corresponding to the first gate driving circuit GOA1 and the second gate driving circuit GOA2 respectively. First, take the heating pad control circuit 1 disposed in the first gate driving circuit GOA1 as an example, which includes a temperature sensing circuit SC1 , a heating pad HP1 , a boosting circuit B1 and a switching circuit SW1 . The temperature sensing circuit SC1 senses the ambient temperature of the first gate driving circuit GOA1, and outputs a first sensing signal EN_sensor1 (as shown in Figures 3 and 4), which has a first signal and a second signal (eg, The value of the first signal is 3.3V, and the value of the second signal is 0V). The heating pad HP1 is disposed in the non-display area NDS. The boosting circuit B1 is coupled to the temperature sensing circuit SC1 and the heating pad HP1. The switching circuit SW1 is coupled between the heating pad HP1 and the boosting circuit B1. When the temperature sensing circuit SC1 determines that the ambient temperature is lower than the preset value (that is, the ambient temperature at this time is not suitable for the operation of the first gate driving circuit GOA1), the temperature sensing circuit SC1 outputs the first signal (as shown in Fig. 3 and Fig. 3). 4. The 3.3V of the first sensing signal EN_sensor1 shown in Fig. 4 is sent to the switching circuit SW1 and the boosting circuit B1. The switching circuit SW1 turns on the boosting circuit B1 and the heating pad HP1, and the boosting circuit B1 outputs the voltage to the heating pad HP1 to heat The pad HP1 starts to heat up to make the first gate driving circuit GOA1 operate normally.

The preset value may be, for example, 0°C, the temperature sensing circuit SC1 determines that the ambient temperature is lower than 0°C and outputs a first signal, and the temperature sensing circuit SC1 determines that the ambient temperature is higher than 0°C and outputs a second signal, which is based on the first gate It can be adjusted according to the working conditions of the pole drive circuit GOA1, but is not limited to the present invention. range of enumeration. The boost circuit B1, the switching circuit SW1 and the clock controller TCON1 are arranged on the circuit board. The temperature sensing circuit SC1 and the heating pad HP1 are respectively connected to the circuit board through wires. The temperature sensing circuit SC1 and the heating pad HP1 are arranged independently of each other. Without interconnection, the temperature sensing circuit SC1 and the heating pad HP1 are respectively disposed adjacent to the first gate driving circuit GOA1.

In this embodiment, the heating pad control circuit 1 of the present invention further includes a power supply circuit PW. The power supply circuit PW is coupled to the temperature sensing circuit SC1 and the booster circuit B1. The voltage circuit B1 and the pulse controller TCON1, for example, the power circuit PW provides a working voltage of 3.3V to the booster circuit B1 (the power circuit PW provides a working voltage of 3.3V to the booster circuit B2), so that the temperature sensing circuit SC1, The booster circuit B1 and the clock controller TCON1 operate normally, and the operating voltages of the temperature sensing circuit SC1 , the booster circuit B1 and the clock controller TCON1 may be the same or different from each other.

As shown in FIG. 2, and described in conjunction with FIG. 3 and FIG. 4, the heating pad control circuit 1 provided in the second gate driving circuit GOA2 also includes a temperature sensing circuit SC2, a heating pad HP2, a booster circuit B2, The switching circuit SW2, the temperature sensing circuit SC2, the heating pad HP2, the boosting circuit B2, and the switching circuit SW2 are all coupled to the switching circuit SW2, and its actuation mechanism is similar to that of the heating pad control circuit 1 disposed in the first gate driving circuit GOA1 , and will not be repeated here.

The heating pads HP1 and HP2 are respectively arranged on the first gate driving circuit GOA1 and the second gate driving circuit GOA2, and the temperature sensing circuits SC1 and SC2 are respectively arranged on the first gate driving circuit GOA1 and the second gate driving circuit GOA1. On the pole drive circuit GOA2, the heating pad HP1 and the temperature sensing circuit SC1 are provided separately from each other, and the heating pad HP2 and the temperature sensing circuit SC2 are provided separately from each other. The heating pads HP1 and HP2 can be respectively composed of multiple heating wires, for example; Heating pads HP1 and HP2 To be composed of a metal alloy and polyimide (PI), the material of the alloy may include indium (In), tin (Sn), aluminum (Al), gold (Au), platinum (Pt), indium (In) , Zinc (Zn), Germanium (Ge), Silver (Ag), Lead (Pb), Palladium (Pd), Copper (Cu), Gold Beryllium (AuBe), Germanium Beryllium (BeGe), Nickel (Ni), Lead tin (PbSn), chromium (Cr), gold zinc (AuZn), titanium (Ti), tungsten (W) and titanium tungsten (TiW). The heating wire may be composed of the aforementioned materials. The aforementioned materials are only examples, and of course other preferred materials can be used, and are not limited to the scope of the present invention.

In addition, the temperature sensing circuits SC1 and SC2 can use the resistance change or voltage change (constant voltage method or constant resistance method) to obtain the ambient temperature at different temperatures. The temperature sensing circuits SC1 and SC2 are based on the ambient temperature and the first gate electrode. As required by the drive circuit GOA1 and the second gate drive circuit GOA2, the booster circuits B1 and B2 are activated to adjust the voltage, so that HP1 and HP2 are heated according to the booster circuits B1 and B2, so that the first gate drive circuit GOA1 and The second gate driving circuit GOA2 can operate normally.

In another embodiment, the user can first set a constant temperature range in the temperature sensing circuits SC1 and SC2, so that the temperature sensing circuits SC1 and SC2 have the set range. If the temperature sensing circuits SC1 and SC2 determine that the ambient temperature exceeds the constant temperature range , the temperature sensing circuits SC1 and SC2 actuate the boosting circuits B1 and B2, and the heating pads HP1 and HP2 begin to heat up, so that the ambient temperature is in the constant temperature range.

The invention further includes a constant voltage feedback circuit, a programmable constant temperature control circuit and a constant current control circuit. The constant voltage feedback circuit detects the ambient temperature, the programmable constant temperature control circuit sets the required temperature, and the constant current control circuit controls the required temperature according to the required temperature. current to adjust the ambient temperature.

Please refer to FIG. 3 , which is a signal waveform diagram of the heating pad control circuit in the first state of the present invention. As shown in Figure 3, and in conjunction with Figures 1 and 2, the first sensing signal EN_sensor1 output by the temperature sensing circuit SC1 is a square wave and has a first signal (3.3V) and a second signal (0V) ), the second sensing signal EN_sensor2 output by the temperature sensing circuit SC2 is a square wave and has the first signal (3.3V) and the second signal (0V). When the temperature sensing circuit SC1 outputs the second signal to the clock controller TCON1 and the temperature sensing circuit SC2 outputs the second signal to the clock controller TCON1, and the switching circuit SW1 outputs the first switching signal FAULT1 and the switching circuit SW2 outputs the second signal When the second switching signals FAULT2 are all transmitted to the clock controller TCON1, the clock controller TCON1 outputs the ready signal Tcon_ready and the setting is completed. After the second sensing signal EN_sensor2 changes from the first signal to the second signal The 1-second output display signal TCON_OUT is used to turn on the power circuit PW to output the energy required by the clock controller TCON1 to display the screen, and the clock controller TCON1 thus outputs the display screen to the first gate driver circuit GOA1 and the second gate driver circuit. GOA2, display the picture in the display area DS.

In addition, as shown in Figures 2 and 3, when the first switching signal FAULT1 and the second switching signal FAULT2 are both at 3.3V, it means that the heating pads HP1 and HP2 are in normal condition, and the clock controller TCON1 maintains the display signal TCON_OUT The voltage is 3.3V to send the start signal EN to the power circuit PW, the power circuit PW is activated, and the display as shown in Figure 1 displays the screen normally. When the first switching signal FAULT1 and the second switching signal FAULT2 are both at 0V, it means that the heating pads HP1 and HP2 are abnormal, the clock controller TCON1 will change the voltage of the display signal TCON_OUT to 0V, and the power circuit PW will not be activated. The monitor shown in Figure 1 has no display screen.

Please refer to FIG. 4 , which is a signal waveform diagram of the second state of the heating pad control circuit of the present invention. As shown in Figure 4, and in conjunction with Figures 1 and 2, the first sensing signal EN_sensor1 output by the temperature sensing circuit SC1 is a square wave waveform and has a first signal (3.3V) and a second signal (0V) ), the second sensing signal EN_sensor2 output by the temperature sensing circuit SC2 is a square wave and has a first signal (3.3V) and a second signal (0V). When the temperature sensing circuit SC1 outputs the second signal to the clock controller TCON1 and the temperature sensing circuit SC2 outputs the second signal to the clock controller TCON1, and the switching circuit SW1 outputs the first switching signal FAULT1 and the switching circuit SW2 outputs the second signal The second switching signal FAULT2 is all transmitted to the clock When the controller is TCON1, the clock controller TCON1 outputs the ready signal Tcon_ready to complete the setting. The clock controller TCON1 outputs the display signal TCON_OUT 1.3 seconds after the output ready signal Tcon_ready (from 0 to 1) to turn on the power circuit PW output The clock controller TCON1 needs the energy to display the picture, so that the clock controller TCON1 outputs the display picture to the first gate driving circuit GOA1 and the second gate driving circuit GOA2, and displays the picture in the display area DS.

In addition, as shown in Figures 2 and 4, when the first switching signal FAULT1 and the second switching signal FAULT2 are both at 3.3V, it means that the heating pads HP1 and HP2 are in normal condition, and the clock controller TCON1 maintains the display signal TCON_OUT The voltage is 3.3V to send the start signal EN to the power circuit PW, the power circuit PW is activated, and the display as shown in Figure 1 displays the screen normally. When the first switching signal FAULT1 and the second switching signal FAULT2 are both at 0V, it means that the heating pads HP1 and HP2 are abnormal, the clock controller TCON1 will change the voltage of the display signal TCON_OUT to 0V, and the power circuit PW will not be activated. The monitor shown in Figure 1 has no display screen.

The heating pad control circuit of the present invention can also be applied to other types of gate driving circuits, and is not limited to the scope of the present invention.

In another embodiment, the heating pads HP1 and HP2 can be fabricated on the glass substrate of the display, and the positions of the heating pads HP1 and HP2 are still located in the non-display area NDS as shown in FIG. 1 .

As mentioned above, the heating pad control circuit 1 of the present invention uses the temperature sensing circuits SC1 and SC2, the heating pads HP1 and HP2, and the booster circuits B1 and B2 to drive the first gate driving circuit GOA1 and the second gate driving The ambient temperature of the circuit GOA2 is constant and can function normally.

The above description is exemplary only, not limiting. Any equivalent modifications or changes that do not depart from the spirit and scope of the present invention shall be included in the appended patent application scope.

B1, B2: boost circuit

CN1, CN2: engaging part

EN_sensor1: The first sensing signal

EN_sensor1: The second sensing signal

FAULT1: The first switching signal

FAULT2: The second switching signal

HP1, HP2: Heating pad

SC1, SC2: temperature sensing circuit

SW1, SW2: switching circuit

PW: Power circuit

TCON1: Clock Controller

TCON_OUT: Display signal

1: Heating pad control circuit

Claims (6)

A heating pad control circuit, applied to a display, the display has a display area and a non-display area surrounding the display area, comprising: a temperature sensing circuit for sensing an ambient temperature of a gate driving circuit; a a heating pad, disposed in the non-display area; a boost circuit, coupled to the temperature sensing circuit and the heating pad; a switching circuit, coupled between the heating pad and the boost circuit; a power circuit, coupled to the a temperature sensing circuit and the boosting circuit, the power supply circuit provides a working voltage to the temperature sensing circuit and the boosting circuit; and a clock controller coupled to the power supply circuit and the temperature sensing circuit; when the temperature The sensing circuit determines that the ambient temperature is lower than a preset value, the temperature sensing circuit outputs a first signal to the switching circuit and the boosting circuit, the switching circuit turns on the boosting circuit and the heating pad, and the boosting The circuit outputs a voltage to the heating pad; wherein, the temperature sensing circuit outputs a second signal to the clock controller, the clock controller receives the working voltage, and the clock controller is based on the first signal and the clock controller The second signal controls the output of a display screen. The heating pad control circuit according to claim 1, wherein the gate driving circuit comprises a first gate driving circuit, and the first gate driving circuit is disposed on one side of the display. The heating pad control circuit of claim 2, wherein the gate driving circuit further comprises a second gate driving circuit, the first gate driving circuit and the second gate driving circuit are respectively located on opposite sides of the display , when the temperature sensing circuit corresponding to the first gate driver circuit and the second gate driver circuit outputs the When the second signal is sent to the clock controller and the switching circuit corresponding to the first gate driving circuit and the second gate driving circuit is turned on, the clock controller outputs the display screen. The heating pad control circuit according to claim 3, wherein the heating pad is respectively disposed on the first gate driving circuit and the second gate driving circuit, and the temperature sensing circuit is respectively disposed on the first gate on the driver circuit and on the second gate driver circuit. The heating pad control circuit as claimed in claim 1, further comprising a constant voltage feedback circuit, a programmable constant temperature control circuit and a constant current control circuit, the constant voltage feedback circuit detects the ambient temperature, and the programmable constant temperature control circuit A desired temperature is set, and the constant current control circuit adjusts the ambient temperature according to the desired temperature. The heating pad control circuit according to any one of claims 1-5, wherein the heating pad consists of a plurality of heating wires.

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