CN216388721U - Start control circuit, display panel and display device - Google Patents

Abstract

The utility model discloses a start control circuit, a display panel and a display device, wherein the circuit comprises: the reference voltage generating module receives a positive power supply voltage and a negative power supply voltage and outputs a first reference voltage and a second reference voltage; a comparison module including a plurality of comparators, a first input terminal of each comparator receiving one of a first reference voltage and a second reference voltage, a second input terminal of each comparator receiving one of a plurality of input signals of the display panel, the comparison module outputting a plurality of comparison signals according to a comparison result of each comparator; and the output module receives the plurality of comparison signals and is used for outputting the starting-up signal of the display panel when the voltage values of the plurality of input signals are all smaller than the corresponding reference voltage values. The utility model can effectively prevent the system from burning out the driving chip in the starting process, has low power consumption and is beneficial to increasing the reliability of the display panel.

Description

Start control circuit, display panel and display device

Technical Field

The utility model relates to the technical field of display, in particular to a starting control circuit, a display panel and a display device.

Background

With the rapid development of light weight, thinness and miniaturization of electronic products, liquid crystal displays are used as display terminals in most of various portable electronic products, and are important components of video cameras, notebook computers, desktop computers, smart televisions, mobile terminals or personal digital processors. The display device comprises a display panel, and the display panel on the display device generates a scanning signal, a data signal and a common voltage signal VCOM by inputting a plurality of signals such as a voltage signal VIN, a high-level reference signal VGH, a low-level reference signal VGL, a positive power voltage signal VSP, a negative power voltage signal VSN and the like, thereby realizing image display.

When the display panel is turned on, the turn-on timing of the driving IC is usually required to be started first by the input voltage signal VIN and then by the high level reference signal VGH, the low level reference signal VGL, the positive power voltage signal VSP, the negative power voltage signal VSN, and the like. However, for most panel designs, the power-down speed of the high-level reference signal VGH is slow. Fig. 1 shows a power-down timing diagram of a part of signals on a display panel after power-off, as shown in fig. 1, the time required for a high-level reference signal VGH to power-down to 0V after power-off of the display panel is 10s, and if the display panel is powered on in the process, a driver IC may be burned out.

The existing solution is to add a ground resistor on the signal path of the high-level reference signal VGH, but the added ground resistor increases the power consumption of the system and is not favorable for the specification requirement of the panel.

Therefore, there is a need to provide an improved technical solution to overcome the technical problems in the prior art.

SUMMERY OF THE UTILITY MODEL

In order to solve the above technical problems, the present invention provides a start control circuit, a display panel and a display device, which can effectively prevent a system from burning out a driving chip during a start-up process, have low power consumption, and contribute to increasing the reliability of the display panel and improving the core competitiveness and the shipment volume of a product.

According to a first aspect of the present disclosure, there is provided a start-up control circuit comprising: the reference voltage generating module receives a positive power supply voltage and a negative power supply voltage and outputs a first reference voltage and a second reference voltage;

a comparison module, including a plurality of comparators, wherein a first input terminal of each comparator receives one of the first reference voltage and the second reference voltage, a second input terminal of each comparator receives one of a plurality of input signals of the display panel, and the comparison module outputs a plurality of comparison signals according to a comparison result of each comparator, and the comparison signals are used for representing magnitude relations between voltage values of the input signals and corresponding reference voltage values;

an output module connected with the comparison module and used for receiving the comparison signals, wherein the output module is used for outputting a starting-up signal of the display panel when the input signals are all smaller than the corresponding reference voltage,

wherein the plurality of input signals driving the display panel at least include: a high level reference signal, a low level reference signal and a supply voltage signal.

Optionally, the reference voltage generation module includes:

a first voltage division unit receiving the positive power supply voltage and outputting the first reference voltage;

and the second voltage division unit receives the negative power supply voltage and outputs the second reference voltage.

Optionally, the first voltage division unit includes:

the first voltage division unit outputs the first reference voltage at a common connection node of the first resistor and the second resistor.

Optionally, the second voltage division unit includes:

the second voltage division unit outputs the second reference voltage at a common connection node of the third resistor and the fourth resistor.

Optionally, the comparison module comprises:

a first comparator, a negative phase input end of which receives the first reference voltage and a positive phase input end of which receives the high level reference signal;

a negative phase input end of the second comparator receives the first reference voltage, and a positive phase input end of the second comparator receives the power supply voltage signal;

and a negative phase input end of the third comparator receives the second reference voltage, and a positive phase input end of the third comparator receives the low-level reference signal.

Optionally, the output module includes:

the first input end of the first OR logic circuit is connected with the output end of the first comparator, and the second input end of the first OR logic circuit is connected with the output end of the second comparator;

and a first input end of the second OR logic circuit is connected with an output end of the first OR logic circuit, a second input end of the second OR logic circuit is connected with an output end of the third comparator, and an output end of the second OR logic circuit outputs the starting-up starting signal.

Optionally, the comparison module comprises:

a fourth comparator, wherein a positive phase input end receives the first reference voltage, and a negative phase input end receives the high level reference signal;

a fifth comparator, wherein a positive phase input end receives the first reference voltage, and a negative phase input end receives the power supply voltage signal;

and a positive phase input end of the sixth comparator receives the second reference voltage, and a negative phase input end of the sixth comparator receives the low-level reference signal.

Optionally, the output module includes:

a first and logic circuit, a first input terminal of which is connected with the output terminal of the fourth comparator, and a second input terminal of which is connected with the output terminal of the fifth comparator;

a first input end of the first AND logic circuit is connected with an output end of the first comparator, and a second input end of the first AND logic circuit is connected with an output end of the sixth comparator;

and the input end of the non-logic circuit is connected with the output end of the second AND logic circuit, and the output end of the non-logic circuit outputs the starting-up starting signal.

According to a second aspect of the present disclosure, there is provided a display panel including: the control circuit is activated as described above.

According to a third aspect of the present disclosure, there is provided a display device including: a display panel as described above.

The utility model has the beneficial effects that: the start control circuit, the display panel and the display device are provided with the reference voltage generation module and the comparison module, can realize the comparison between each input signal of the display panel and the corresponding reference voltage one by one, and are provided with the output module, and can generate the start signal of the display panel when each input signal of the display panel is smaller than the corresponding reference voltage, namely, the start of the display panel is controlled after each input signal of the display panel is below the reference value, so that the driving chip can be effectively prevented from being burnt out by a system in the start process, the power consumption is low, the reliability of the display panel is increased, and the core competitiveness and the shipment quantity of products are improved.

Drawings

FIG. 1 is a schematic diagram showing a power-down sequence of a part of signals on a display panel after shutdown;

fig. 2 is a schematic structural diagram of a display device provided in an embodiment of the present disclosure;

FIG. 3 illustrates a system block diagram of a startup control circuit provided by an embodiment of the present disclosure;

fig. 4 is a schematic circuit diagram of a start control circuit according to a first embodiment of the disclosure;

fig. 5 is a schematic circuit diagram of a start control circuit according to a second embodiment of the present disclosure.

Detailed Description

In order to facilitate an understanding of the utility model, the utility model will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. The utility model may, however, be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

As shown in fig. 2, the display device of the present embodiment includes a display panel 100, a gate driving circuit 200, a source driving circuit 300, and a timing control circuit 400.

The display panel 100 includes an array substrate including a display area DA and a non-display area PA. The non-display area PA is located outside the display area DA and may surround the display area DA, and meanwhile, a driving chip and its wiring for driving the pixels in the display area DA may be disposed in the non-display area PA of the array substrate. A plurality of pixels PX are disposed in a display area DA of the array substrate. Here, each pixel PX is connected to the source driving circuit 300 through one data line DL, and connected to the gate driving circuit 200 through one scan line SL.

Further, the display panel 100 includes, but is not limited to: any one of a cathode ray tube display panel, a digital light processing display panel, a liquid crystal display panel, a light emitting diode display panel, an organic light emitting diode display panel, a quantum dot display panel, a Mirco-LED display panel, a Mini-LED display panel, a field emission display panel, a plasma display panel, an electrophoretic display panel, or an electrowetting display panel.

Further, the gate driving circuit 200 may include a plurality of gate driving units, each of which is coupled to one scan line SL of the display panel 100 to provide a scan signal to a corresponding pixel PX through the scan line SL.

The source driving circuit 300 is coupled to a plurality of data lines DL for providing a plurality of data signals to corresponding pixels PX through the data lines DL.

The timing control circuit 400 is used for providing a plurality of input signals required for driving the display panel. Illustratively, the plurality of input signals includes, but is not limited to: a plurality of signals such as a plurality of switch signals (denoted as SWn), a start signal (denoted as STV), a plurality of clock signals (denoted as CLKm), an input voltage signal VIN, a high-level reference signal VGH, a low-level reference signal VGL, a positive power supply voltage signal VSP, a negative power supply voltage signal VSN, and a power supply voltage signal VDD.

Further, in the embodiment of the present disclosure, the display device further includes a start control circuit 500, for example, the start control circuit 500 may be disposed in the non-display area PA of the display panel 100, and is configured to detect a plurality of input signals driving the display panel 100 in real time at least before the display panel 100 is powered on, so as to ensure that the plurality of input signals are all below a preset reference value when the display panel 100 is powered on, thereby avoiding burning out the driving chips during the power on process and increasing the reliability of the display panel.

Referring to fig. 3, 4 and 5, in the present disclosure, the start-up control circuit 500 includes: a reference voltage generation module 510, a comparison module 520 and an output module 530.

The reference voltage generation module 510 receives a positive power voltage VS + and a negative power voltage VS-, and outputs a first reference voltage Vref + and a second reference voltage Vref-.

Illustratively, the reference voltage generation module 510 is a first reference voltage Vref + and a second reference voltage Vref-for converting the positive power voltage VS + and the negative power voltage VS-, respectively, to generate based on a resistor voltage division manner. Specifically, the reference voltage generating module 510 includes a first voltage dividing unit and a second voltage dividing unit, wherein the first voltage dividing unit receives the positive power voltage VS + and outputs a first reference voltage Vref +; the second voltage dividing unit thereof receives the negative power supply voltage VS-and outputs a second reference voltage Vref-.

As shown in fig. 4 and 5, in the present embodiment, the first voltage division unit includes: a first resistor R1 and a second resistor R2. The first resistor R1 and the second resistor R2 are connected in series between the input terminal of the positive power voltage VS + and the ground reference, and the first voltage dividing unit outputs the first reference voltage Vref + at the common connection node of the first resistor R1 and the second resistor R2. And the second voltage division unit includes: a third resistor R3 and a fourth resistor R4, the third resistor R3 and the fourth resistor R4 are sequentially connected in series between the input terminal of the negative power voltage VS-and the reference ground, and the second voltage division unit outputs a second reference voltage Vref-at the common connection node of the third resistor R3 and the fourth resistor R4.

For example, the positive power voltage VS + received by the reference voltage generating module 510 may be provided by the backlight driving voltage VLED in the display panel 100, and the negative power voltage VS-received by the reference voltage generating module 510 may be provided by a charge pump, for example. It should be noted that, in this embodiment, the first reference voltage Vref + generated by the reference voltage generating module 510 is a reference voltage corresponding to a positive voltage signal of the plurality of input signals for driving the display panel 100, the second reference voltage Vref-generated by the reference voltage generating module 510 is a reference voltage corresponding to a negative voltage signal of the plurality of input signals for driving the display panel 100, and the specific values of the first reference voltage Vref + and the second reference voltage Vref-generated by the reference voltage generation module 510 can be reasonably set according to the actual specification of the driving chip of the display panel 100, the voltage values of the output first reference voltage Vref + and the output second reference voltage Vref-can be adjusted only by adjusting the voltage division ratio of the first voltage division unit and the second voltage division unit, that is, adjusting the resistance values of the first resistor R1, the second resistor R2, the third resistor R3 and the third resistor R4. Of course, the first reference voltage Vref + and the second reference voltage Vref may also be directly generated by an external voltage supply circuit, which is not limited by the present disclosure.

In the disclosure, the comparing module 520 is connected to the reference voltage generating module 510, and the comparing module 520 includes a plurality of comparators, a first input terminal of each comparator of the plurality of comparators receives one of the first reference voltage Vref + and the second reference voltage Vref +, a second input terminal of each comparator receives one of a plurality of input signals for driving the display panel 100, and the comparing module 520 outputs a plurality of comparison signals according to a comparison result of each comparator, wherein the comparison signals are used for representing a magnitude relationship between the plurality of input signals and the corresponding reference voltages. The reference voltage and the input signal received by the two input terminals of each comparator in the comparing module 520 have the following correspondence: when one input terminal of the comparator receives a positive voltage signal (e.g., the high level reference signal VGH and the supply voltage signal VDD) in the plurality of input signals, the other input terminal of the comparator should receive a first reference voltage Vref + indicating a positive voltage reference; and when one input terminal of the comparator receives a negative voltage signal (e.g., the low level reference signal VGL) among the plurality of input signals, the other input terminal of the comparator should receive a second reference voltage Vref-representing a negative voltage reference.

The output module 530 is connected to the comparing module 520 and receives the comparison signals output by the comparing module 520, and the output module 530 is configured to output a power-on start signal Fail _ det of the display panel when a plurality of input signals for driving the display panel are all smaller than corresponding reference voltages. In this embodiment, the power-on start signal Fail _ det is set to be at a low level only, so that the display panel 100 can be controlled to be powered on.

In a first embodiment of the present disclosure, referring to fig. 4, the comparison module 520 includes: a first comparator U1, a second comparator U2, and a third comparator U3. The output module 530 includes a first or logic circuit U4 and a second or logic circuit U5. Wherein a negative phase input terminal of the first comparator U1 receives the first reference voltage Vref +, and a positive phase input terminal of the first comparator U1 receives the high level reference signal VGH. The negative input of the second comparator U2 receives the first reference voltage Vref + and the positive input of the second comparator U2 receives the supply voltage signal VDD. A negative phase input terminal of the third comparator U3 receives the second reference voltage Vref-, and a positive phase input terminal of the third comparator U3 receives the low level reference signal VGL. A first input of the first or logic circuit U4 is connected to an output of the first comparator U1 and a second input of the first or logic circuit U4 is connected to an output of the second comparator U2. A first input terminal of the second or logic circuit U5 is connected to an output terminal of the first or logic circuit U4, a second input terminal of the second or logic circuit U5 is connected to an output terminal of the third comparator U3, and an output terminal of the second or logic circuit U5 outputs a power-on enable signal Fail _ det.

In this embodiment, each comparator in the comparing module 520 outputs a low-level comparison signal when the voltage value of the received input signal is smaller than the corresponding reference voltage value, which indicates that the voltage values of the input signal are all below the reference value. Further, based on the circuit property of the output module 530 or the logic circuit, the output module 530 can output the low-level power-on start signal Fail _ det only when the comparison signal output by each comparator is at a low level, so as to control the display panel 100 to power on. When the comparison signal output by at least one of the comparators in the comparison modules 520 is at a high level, the output module 530 outputs a high-level signal to control the display panel 100 not to be turned on. Therefore, it can be ensured that a plurality of input voltage values of the display panel 100 can be below the reference value when the display panel is turned on, and the problem of burning out the driving chip in the process of turning on the display panel is effectively avoided.

In a second embodiment of the present disclosure, referring to fig. 5, the comparison module 520 includes: a fourth comparator U6, a fifth comparator U7, and a sixth comparator U8. The output module 530 includes a first AND logic circuit U9, a second AND logic circuit U10, and a NOT logic circuit U11. Wherein a non-inverting input terminal of the fourth comparator U6 receives the first reference voltage Vref +, and a negative-inverting input terminal of the fourth comparator U6 receives the high-level reference signal VGH. A non-inverting input of the fifth comparator U7 receives the first reference voltage Vref + and a negative input of the fifth comparator U7 receives the supply voltage signal VDD. A non-inverting input terminal of the sixth comparator U8 receives the second reference voltage Vref-, and a negative-phase input terminal of the sixth comparator U8 receives the low-level reference signal VGL. A first input of the first and logic circuit U9 is connected to an output of the fourth comparator U6, and a second input of the first and logic circuit U9 is connected to an output of the fifth comparator U7. A first input of the second and-logic circuit U10 is connected to an output of the first and-logic circuit U9, and a second input of the second and-logic circuit U10 is connected to an output of the sixth comparator U8. The input end of the non-logic circuit U11 is connected to the output end of the second AND-logic circuit U10, and the output end of the non-logic circuit U11 outputs a power-on start signal Fail _ det.

In this embodiment, each comparator in the comparing module 520 outputs a low-level comparison signal when the voltage value of the received input signal is smaller than the corresponding reference voltage value, which indicates that the voltage values of the input signal are all below the reference value. Further, based on the circuit property of the nand logic circuit of the output module 530, the output module 530 can output the low-level power-on start signal Fail _ det only when the comparison signal output by each comparator is at the high level, so as to control the display panel 100 to power on. When the comparison signal output by at least one of the comparators in the comparison modules 520 is at a low level, the output module 530 outputs a high-level signal to control the display panel 100 not to be turned on. Therefore, it can be ensured that a plurality of input voltages of the display panel 100 can be below the reference value when the display panel is turned on, and the problem of burning out the driving chip in the process of turning on the display panel is effectively avoided.

Further, in the present disclosure, the positive power supply terminal of each comparator receives a positive power supply voltage VS +, and the negative power supply terminal of each comparator receives a negative power supply voltage VS-.

It should be noted that, in fig. 4 and fig. 5 of the present disclosure, only three comparators are used for performing detection and comparison on three input signals of the display panel 100, but in practical applications, the number of the comparators in the comparison module 520 and the number of the logic circuits in the output module 530 may be adjusted according to the number of the input signals that need to be detected and compared in a specific display panel 100, which is not limited by the present disclosure.

In summary, the comparison between each input signal of the display panel and the corresponding reference voltage can be realized one by one through the reference voltage generation module and the comparison module, and the output module can generate the starting signal of the display panel when the voltage value of each input signal of the display panel is smaller than the corresponding reference voltage value, that is, the display panel is controlled to start after the voltage value of each input signal of the display panel is below the reference value, so that the driving chip is effectively prevented from being burnt out by the system in the starting process, the power consumption is low, the reliability of the display panel is increased, and the core competitiveness and the shipment quantity of the product are improved.

Finally, it should be noted that: it should be understood that the above examples are only for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the utility model may be made without departing from the scope of the utility model.

Claims (10)

1. A startup control circuit, comprising:

the reference voltage generating module receives a positive power supply voltage and a negative power supply voltage and outputs a first reference voltage and a second reference voltage;

a comparison module, including a plurality of comparators, wherein a first input terminal of each comparator receives one of the first reference voltage and the second reference voltage, a second input terminal of each comparator receives one of a plurality of input signals of the display panel, and the comparison module outputs a plurality of comparison signals according to a comparison result of each comparator, and the comparison signals are used for representing magnitude relations between voltage values of the input signals and corresponding reference voltage values;

an output module connected with the comparison module and used for receiving the comparison signals, wherein the output module is used for outputting a starting-up signal of the display panel when the input signals are all smaller than the corresponding reference voltage,

wherein the plurality of input signals driving the display panel at least include: a high level reference signal, a low level reference signal and a supply voltage signal.

2. The start-up control circuit of claim 1, wherein the reference voltage generation module comprises:

a first voltage division unit receiving the positive power supply voltage and outputting the first reference voltage;

and the second voltage division unit receives the negative power supply voltage and outputs the second reference voltage.

3. The start-up control circuit according to claim 2, wherein the first voltage division unit includes:

the first voltage division unit outputs the first reference voltage at a common connection node of the first resistor and the second resistor.

4. The start-up control circuit according to claim 2, wherein the second voltage dividing unit includes:

the second voltage division unit outputs the second reference voltage at a common connection node of the third resistor and the fourth resistor.

5. The startup control circuit of claim 1, wherein the comparison module comprises:

a first comparator, a negative phase input end of which receives the first reference voltage and a positive phase input end of which receives the high level reference signal;

a negative phase input end of the second comparator receives the first reference voltage, and a positive phase input end of the second comparator receives the power supply voltage signal;

and a negative phase input end of the third comparator receives the second reference voltage, and a positive phase input end of the third comparator receives the low-level reference signal.

6. The start-up control circuit of claim 5, wherein the output module comprises:

the first input end of the first OR logic circuit is connected with the output end of the first comparator, and the second input end of the first OR logic circuit is connected with the output end of the second comparator;

and a first input end of the second OR logic circuit is connected with an output end of the first OR logic circuit, a second input end of the second OR logic circuit is connected with an output end of the third comparator, and an output end of the second OR logic circuit outputs the starting-up starting signal.

7. The startup control circuit of claim 1, wherein the comparison module comprises:

a fourth comparator, wherein a positive phase input end receives the first reference voltage, and a negative phase input end receives the high level reference signal;

a fifth comparator, wherein a positive phase input end receives the first reference voltage, and a negative phase input end receives the power supply voltage signal;

and a positive phase input end of the sixth comparator receives the second reference voltage, and a negative phase input end of the sixth comparator receives the low-level reference signal.

8. The start-up control circuit of claim 7, wherein the output module comprises:

a first and logic circuit, a first input terminal of which is connected with the output terminal of the fourth comparator, and a second input terminal of which is connected with the output terminal of the fifth comparator;

a first input end of the first AND logic circuit is connected with an output end of the first comparator, and a second input end of the first AND logic circuit is connected with an output end of the sixth comparator;

and the input end of the non-logic circuit is connected with the output end of the second AND logic circuit, and the output end of the non-logic circuit outputs the starting-up starting signal.

9. A display panel, comprising: a start-up control circuit as claimed in any one of claims 1 to 8.

10. A display device, comprising: the display panel of claim 9.

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