CN114123733A - Display circuit and device - Google Patents
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- CN114123733A CN114123733A CN202111416439.9A CN202111416439A CN114123733A CN 114123733 A CN114123733 A CN 114123733A CN 202111416439 A CN202111416439 A CN 202111416439A CN 114123733 A CN114123733 A CN 114123733A
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- 238000001514 detection method Methods 0.000 claims abstract description 27
- 230000007613 environmental effect Effects 0.000 claims abstract description 4
- 238000012544 monitoring process Methods 0.000 claims abstract description 3
- 238000010586 diagram Methods 0.000 description 8
- 230000000875 corresponding effect Effects 0.000 description 7
- 238000013508 migration Methods 0.000 description 5
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- 239000010409 thin film Substances 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 238000012827 research and development Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
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- 230000033228 biological regulation Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
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Abstract
The application provides a display circuit and a device. The display circuit comprises a power management chip and a temperature detection circuit. The power management chip is internally provided with a driving circuit which can output a starting voltage; the power management chip is also provided with a temperature receiving end; the temperature detection circuit comprises a first voltage division circuit and a second voltage division circuit; the first voltage division circuit comprises a temperature sensing element, and the temperature sensing element is used for monitoring the ambient temperature of the display circuit; a temperature feedback end is arranged between the first voltage division circuit and the second voltage division circuit; the temperature feedback end is connected with the temperature receiving end to transmit the sensed environmental temperature; and when the ambient temperature is lower than the preset temperature, the power management chip outputs compensation voltage to compensate the starting voltage. Therefore, the adjustment controllability of the turn-on voltage can be improved.
Description
Technical Field
The present disclosure relates to display technologies, and particularly to a display circuit and a display device.
Background
The Display device includes a Liquid Crystal Display (LCD), an Organic electroluminescent Display (OLED), and the like.
The display device generally has a power board, a control board, and a logic board. The power panel is used for providing power supply voltage for each part in the display device. The control board is mainly used to help realize main functions of display, such as signal processing, image processing, sound processing, and the like, and output a control signal. The logic board is used for processing the control signal output from the control board, converting the control signal into a signal which can be identified by the display device so as to control the MOS tube in the screen to work, and finally displaying the image data.
In the related art, it is generally necessary to input an on Voltage (VGH) and an off Voltage (VGL) to a display panel to cause electron transfer, thereby controlling on and off of a thin film transistor of each pixel of the display panel or a thin film transistor in a Gate Driver on Array (GOA) circuit. Wherein the turn-on voltage is generally a constant high voltage. However, in a low temperature environment, sufficient electron migration cannot be achieved by using the turn-on voltage at room temperature, and the thin film transistor cannot be normally turned on, so that normal charging and discharging cannot be achieved. Because the existing power panel, the control panel and the logic panel adopt a three-panel discrete design or a combined design, the integration level is higher, so that the controllability of the adjustment of the starting voltage is poor, and the fine adjustment in the actual production is inconvenient.
Therefore, how to improve the controllability of the regulation of the turn-on Voltage (VGH) becomes a problem that those skilled in the art are addressing.
Disclosure of Invention
An object of the present application is to provide a display circuit with high controllability.
Another object of the present application is to provide a display device having high controllability.
In order to solve the technical problem, the following technical scheme is adopted in the application:
according to the first aspect of the present application, there is also provided a display circuit, which includes a power management chip and a temperature detection circuit; the power management chip is internally provided with a driving circuit and can output a starting voltage; the power management chip is also provided with a temperature receiving end; the temperature detection circuit comprises a first voltage division circuit and a second voltage division circuit; the first voltage division circuit comprises a temperature sensing element, and the temperature sensing element is used for monitoring the ambient temperature of the display circuit; a temperature feedback end is arranged between the first voltage division circuit and the second voltage division circuit; the temperature feedback end is connected with the temperature receiving end to transmit the sensed environmental temperature; when the environmental temperature is lower than the preset temperature, the power management chip outputs the compensation voltage to compensate the starting voltage, so that enough electrons are transferred by compensating the starting voltage.
In some embodiments, a temperature compensation circuit is provided within the power management chip; when the temperature received by the temperature receiving end is lower than the set temperature, the temperature compensation circuit outputs temperature compensation voltage.
In some embodiments, the temperature compensation circuit includes a comparison circuit and a compensation voltage generation circuit; the comparison circuit is connected with the temperature receiving end so as to compare the received ambient temperature with a preset temperature; when the ambient temperature is lower than the preset temperature, the driving compensation voltage generation circuit generates temperature compensation voltage.
In some embodiments, the temperature compensation circuit further comprises a threshold determination unit; the threshold value determining unit is used for determining a preset threshold value according to the corresponding relation between the resistance value of the temperature sensing element and the ambient temperature.
In some embodiments, the resistance value of the second voltage-dividing resistor and/or the first voltage-dividing resistor is adjustable; the threshold value determining unit is further used for adjusting the resistance value of the second voltage-dividing resistor and/or the first voltage-dividing resistor according to the determined threshold value.
In some embodiments, the compensation voltage generation circuit is capable of generating a first compensation voltage and a second compensation voltage, the first compensation voltage being greater than the second compensation voltage; under the condition that the ambient temperature is within a first ring temperature range, the compensation voltage generation circuit generates a first compensation voltage; the compensation voltage generation circuit generates a second compensation voltage in a case where the ambient temperature is within a second loop temperature range, wherein the temperature of the first loop temperature range is lower than the temperature of the second loop temperature range.
In some embodiments, the temperature sensing element is a temperature sensitive resistor; the first voltage division circuit comprises a first voltage division resistor and a temperature-sensitive resistor which are connected in parallel; the second voltage division circuit comprises a second voltage division resistor; the first end connected with the first voltage-dividing resistor and the temperature-sensitive resistor is grounded, the second end connected with the first voltage-dividing resistor is connected with one end of the second voltage-dividing resistor, and the other end of the second voltage-dividing resistor is connected to the power supply end of the temperature detection circuit.
In some embodiments, the power management chip outputs a first reference voltage; the first reference voltage is input to the power supply terminal.
In some embodiments, the power management chip comprises a microprocessor; the microprocessor is connected with the temperature receiving end to compare the received ambient temperature with a preset temperature and output a control signal when the ambient temperature is lower than the preset temperature so as to generate temperature compensation voltage.
According to a second aspect of the present application, there is also provided a display device including the power supply board and the display circuit as described above; a power management chip is arranged on the power panel; the display circuit is arranged outside the power management chip and electrically connected with the power management chip.
According to the technical scheme, the beneficial effects of the application are as follows:
in the application, on one hand, the temperature receiving end is arranged on the power management chip to receive the ambient temperature detected by the temperature detection circuit, and the temperature detection circuit is arranged outside the power management chip, so that the ambient temperature can be detected more accurately, and the controllability of the compensation voltage output can be improved. On the other hand, the components of the first voltage division circuit and the second voltage division circuit are convenient to replace, the convenience degree of product adjustment between regions with large environment temperature differences is reduced, and the cost is reduced.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The above and other objects, features and advantages of the present application will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.
Fig. 1 is a schematic diagram illustrating a structure of a display circuit according to an example embodiment.
Fig. 2 is a schematic diagram showing a structure of a temperature detection circuit 30 according to a first exemplary embodiment.
Fig. 3 is a schematic diagram showing a structure of a temperature detection circuit 30 according to a second exemplary embodiment.
Fig. 4 is a schematic structural diagram of a display device according to an embodiment of the present application.
Description of reference numerals:
20. a power management chip; 30. a temperature detection circuit; 31. a first voltage dividing circuit; 32. a second voltage dividing circuit; r1, a first divider resistor; r2 and a second divider resistor; RT, temperature sensitive resistor; p1, temperature feedback end; p2, temperature receiving end; p3, a second temperature receiving end; 41. a power panel; 42. a control panel; 45. a logic board; 43. a display screen driving board; 44. a display screen.
Detailed Description
While this application is susceptible of embodiment in different forms, there is shown in the drawings and will herein be described in detail only some specific embodiments thereof with the understanding that the present disclosure is to be considered as an exemplification of the principles of the application and is not intended to limit the application to that as illustrated herein.
Thus, a feature indicated in this specification is intended to describe one of the features of an embodiment of the application and does not imply that every embodiment of the application must have the described feature. Further, it should be noted that this specification describes many features. Although some features may be combined to show a possible system design, these features may also be used in other combinations not explicitly described. Thus, the combinations illustrated are not intended to be limiting unless otherwise specified.
In the embodiments shown in the drawings, directional references (such as up, down, left, right, front, and rear) are used to explain the structure and movement of the various elements of the present application not absolutely, but relatively. These descriptions are appropriate when the elements are in the positions shown in the drawings. If the description of the positions of these elements changes, the indication of these directions changes accordingly.
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The drawings are merely schematic illustrations of the present application and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted.
The preferred embodiments of the present application will be further described in detail below with reference to the accompanying drawings of the present specification.
In a low-temperature environment, sufficient electron migration cannot be performed by using the turn-on voltage at normal temperature, and in the case of insufficient electron migration, the thin film transistor or the GOA is normally turned on, and normal charging and discharging cannot be performed, which may cause abnormal display of the display device. And because the environment temperature difference of different areas is large, the integrated power management chip is inconvenient to adjust the output of the temperature compensation voltage.
Therefore, the display circuit needs to be redesigned to improve the controllability of the output of the compensation voltage.
Fig. 1 is a schematic diagram illustrating a structure of a display circuit according to an example embodiment. As shown in fig. 2, the display circuit includes a power management chip 20 and a temperature detection circuit 30. The temperature detection circuit 30 is disposed outside the power management chip.
The power management chip 20 has a driving circuit therein, and is capable of outputting a start-up voltage, where the start-up voltage is used to drive electron migration to turn on a thin film transistor or a GOA, so as to perform charging and discharging to display a picture.
The power management chip is also provided with a temperature receiving end for receiving an electric feedback value corresponding to the actual environment temperature.
The temperature detection circuit 30 includes a first voltage division circuit and a second voltage division circuit. The first voltage division circuit comprises a temperature sensing element so as to monitor the ambient temperature of the display circuit through the temperature sensing element.
The temperature detection circuit 30 is configured to feed back the ambient temperature to the power management chip, and specifically, a temperature feedback end is disposed between the first voltage dividing circuit and the second voltage dividing circuit, so as to be connected to the temperature receiving end through the temperature feedback end, so as to transmit the sensed ambient temperature.
In order to solve the problem that the display device cannot be normally charged and discharged at a low temperature, in this example, when the ambient temperature is lower than the preset temperature, the power management chip outputs the compensation voltage so as to drive the electron migration together by the compensation voltage and the turn-on voltage, so that the display device can normally operate.
Therefore, on one hand, the temperature receiving end is arranged on the power management chip to receive the ambient temperature detected by the temperature detection circuit, and the temperature detection circuit is arranged outside the power management chip, so that the ambient temperature can be detected more accurately, and the controllability of compensation voltage output can be improved. On the other hand, the components of the first voltage division circuit and the second voltage division circuit are convenient to replace, the convenience degree of product adjustment between regions with large environment temperature differences is reduced, and the cost is reduced.
Fig. 2 is a schematic diagram showing a structure of a temperature detection circuit 30 according to a first exemplary embodiment. As shown in fig. 2, the temperature detection circuit 30 includes a first voltage division circuit 31 and a second voltage division circuit 32. The first voltage dividing circuit comprises a first voltage dividing resistor R1 and a temperature-sensitive resistor RT which are connected in parallel. The second voltage dividing circuit includes a second voltage dividing resistor R2. Specifically, a first end of the first voltage-dividing resistor R1 and the temperature-sensitive resistor RT connected to each other is grounded, a second end of the first voltage-dividing resistor R1 connected to each other is connected to one end of the second voltage-dividing resistor R2, and the other end of the second voltage-dividing resistor R2 is connected to a power supply end of the temperature detection circuit. A temperature feedback end P1 is provided between the first voltage-dividing circuit 31 and the second voltage-dividing circuit 32, the power management chip PMIC has a temperature receiving end P2, and the receiving of the feedback value corresponding to the actual environment temperature is realized by using the variability of the temperature sensitive resistor RT. In this embodiment, the temperature detection circuit 30 supplies the terminal to the first reference voltage output by the power management chip PMIC, and the reference voltage may be +5V generated by the power management chip PMIC.
Specifically, the voltage V of the temperature feedback end P1P1As shown in the following equation (1):
when the temperature-sensitive resistor RT is negatively correlated with the resistance value and the temperature, the temperature-sensitive resistor RT decreases along with the temperature rise, the denominator value increases, and VP1The voltage of (2) is decreased. Therefore, the voltage received by the temperature receiving terminal P2 also decreases. When the feedback voltage value is reduced to a preset threshold value, the ambient temperature can be determined to be lower than the preset temperature, and then the output of the compensation voltage is controlled, so that the display device is ensured to be started in a low-temperature environment.
Fig. 3 is a schematic diagram showing a structure of a temperature detection circuit 30 according to a second exemplary embodiment. As shown in fig. 3, the temperature detection circuit 30 includes a first voltage division circuit 31 and a second voltage division circuit 32. The first voltage dividing circuit comprises a first voltage dividing resistor R1 and a temperature-sensitive resistor RT which are connected in parallel. The second voltage dividing circuit includes a second voltage dividing resistor R2. The power supply end of the temperature detection circuit is connected to the first reference voltage output by the power management chip PMIC.
The realization principle is as follows:
the power management chip PMIC outputs the first reference voltage Vout, and the values of the equivalent resistances R of the first voltage divider circuit 31 and the second voltage divider circuit 32 are shown in the following equation (2):
R＝R1+R2*RT/(R2+RT) (2)
the voltage at the temperature feedback terminal P1 is shown in the following equation (3):
a temperature feedback end P1 is disposed between the first voltage dividing circuit 31 and the second voltage dividing circuit 32, and the temperature feedback end P1 is connected to a second temperature receiving end P3 on the logic board TCON.
The logic board TCON may be provided with a micro control unit MCU, and is configured to compare a feedback result of the temperature detection circuit 30 with a preset threshold, generate a control instruction according to the comparison result, feed back the control instruction to the power management chip PMIC through the temperature receiving terminal P2, and then enable the power management chip PMIC to output a temperature compensation voltage. Therefore, when the display device suitable for different temperatures is replaced, only the first voltage-dividing resistor R1 or the temperature-sensitive resistor RT or the second voltage-dividing resistor R2 needs to be changed, the logic board TCON and the power management chip PMIC do not need to be redesigned, the controllability of temperature compensation can be effectively improved, and the research and development cost is reduced. Further, the power management chip PMIC may also be disposed on the logic board TCON, so as to facilitate outputting the driving voltage to the display screen driving board.
In one embodiment, the power management chip may have a temperature compensation circuit therein. When the temperature received by the temperature receiving end is lower than the set temperature, the temperature compensation circuit outputs temperature compensation voltage. Therefore, the temperature compensation circuit is arranged, so that the output of the compensation voltage is more reliable.
The temperature compensation circuit may include a comparison circuit and a compensation voltage generation circuit. Specifically, as shown in fig. 2 and fig. 3, when the temperature sensitive circuit RT is a negative correlation coefficient resistor, the output voltage of the temperature feedback terminal P1 continuously decreases when the temperature decreases, and the comparison circuit compares the output voltage of the temperature feedback terminal P1 with a preset threshold, illustratively, the comparison circuit may have a switch tube, which may be an NMOS tube, and the preset voltage may be a turn-on threshold of the NMOS tube, and when the output voltage of the temperature feedback terminal P1 matches the turn-on threshold, the NMOS tube is turned on, so that the compensation voltage generating circuit is turned on, and the compensation voltage is output. When the temperature sensitive resistor RT is a positive correlation coefficient resistor, and the temperature is reduced, the output voltage of the temperature feedback terminal P1 will continuously increase, illustratively, the comparison circuit may include a PMOS transistor, and when the output voltage of the temperature feedback terminal P1 increases to a preset threshold, that is, when the conduction threshold of the PMOS transistor is reached, the PMOS transistor is turned on, so that the compensation voltage generation circuit is turned on, and the compensation voltage is output, so that when the ambient temperature is lower than the preset temperature, the compensation voltage generation circuit is driven to generate the temperature compensation voltage.
In one embodiment, the compensation voltage generation circuit is capable of generating a first compensation voltage or a second compensation voltage, the first compensation voltage being greater than the second compensation voltage. Under the condition that the ambient temperature is within a first ring temperature range, the compensation voltage generation circuit generates a first compensation voltage; the compensation voltage generation circuit generates a second compensation voltage in a case where the ambient temperature is within a second loop temperature range, wherein the temperature of the first loop temperature range is lower than the temperature of the second loop temperature range. Thereby enabling accurate output of the compensation voltage according to the specific ambient temperature.
Specifically, the compensation voltage generation circuit may have a first voltage generator and a second voltage generator. The first voltage generator and the second voltage generator respectively correspond to different control elements, and at least two control elements can be activated when the ambient temperature is in a first loop temperature range or a second loop temperature range respectively, so that the first voltage generator or the second voltage generator works and then generates a first compensation voltage or a second compensation voltage.
In one embodiment, the temperature compensation circuit may further include a threshold determination unit; the threshold value determining unit is used for determining a preset threshold value according to the corresponding relation between the resistance value of the temperature sensing element and the ambient temperature. Specifically, when the temperature compensation circuit is adjusted, a new threshold value can be determined again according to the relationship between the resistance value of the replaced temperature sensing element and the ambient temperature, and functional devices such as a microprocessor and the like for comparing the threshold value are compared according to the new threshold value, so that the threshold value can be adjusted in real time according to different conditions, the controllability of the temperature compensation voltage output of the display device is improved, when the threshold value of the temperature compensation circuit needs to be adjusted, the threshold value is determined by the threshold value determining unit, the structure of a power management chip does not need to be changed, and the whole research and development period of the display device is shortened.
Further, in an embodiment, the resistance value of the second voltage-dividing resistor and/or the first voltage-dividing resistor is adjustable, and after the threshold determination unit sets a new threshold, the temperature feedback value corresponding to the preset temperature can be adapted to the new threshold by adjusting the resistance value of the second voltage-dividing resistor and/or the first voltage-dividing resistor, so that the generation of the compensation voltage is triggered after the actual ambient temperature drops to the preset temperature.
In one embodiment, the output terminal for triggering the compensation voltage may be provided with a zener diode, thereby preventing the generated compensation voltage from being too high to damage the display device.
Fig. 4 is a schematic structural diagram of a display device according to an embodiment of the present application. As shown in fig. 4, the display device generally has a power board 41, a control board 42, a logic board 45, a display screen driving board 43, and a display screen 44.
The control board 42 is laid with a main control circuit, which receives video image signals input from the outside and transmits the video image signals to a logic board circuit on the logic board. The video image signals include clock signals, data signals and control signals that drive the display screen to display the video image.
The logic board 45 includes a logic board chip, and the logic board chip processes the received video image signal and outputs a driving signal for driving the display screen to display to the display screen driving board 43 of the display screen. The display screen driving board 43 is laid with a display screen driving circuit, which includes a source driving circuit and a gate driving circuit, the gate driving circuit has a main function of sequentially turning on the transistors in a row on the panel, when the gate driving circuit turns on the transistors sequentially, the source driving circuit converts the corresponding display data into a voltage, and then charges and discharges the capacitor on the panel to a voltage corresponding to the gray scale.
The power board 41 is used for providing a driving voltage for driving the display panel driving circuit to operate, and in general, when the display panel is a liquid crystal display panel, the operating voltage is roughly divided into five parts, +3.3V, +5V, +15V, -15V, + 45V. The +3.3V and +5V can be obtained by a voltage reduction and stabilization circuit, and the other three groups are obtained by converting a voltage converter. The above components cooperate to collectively effect the display of the video image on the display screen 44.
The display circuit in this application can be disposed on the logic board 45 or disposed in a peripheral circuit of the power management chip in the power board 41, so as to manage the output of the compensation voltage and improve the controllability of the output of the compensation voltage.
While the present application has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present application may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.
Claims (10)
1. A display circuit, display circuit includes power management chip and temperature detection circuit, have drive circuit in the power management chip, drive circuit can export turn-on voltage, its characterized in that:
the power management chip is also provided with a temperature receiving end;
the temperature detection circuit comprises a first voltage division circuit and a second voltage division circuit; the first voltage division circuit comprises a temperature sensing element for monitoring the ambient temperature of the display circuit; a temperature feedback end is arranged between the first voltage division circuit and the second voltage division circuit; the temperature feedback end is connected with the temperature receiving end to transmit the sensed environmental temperature; and when the ambient temperature is lower than the preset temperature, the power management chip outputs compensation voltage to compensate the starting voltage.
2. The circuit of claim 1, wherein the power management chip has a temperature compensation circuit therein; and when the temperature received by the temperature receiving end is lower than the set temperature, the temperature compensation circuit outputs temperature compensation voltage.
3. The circuit of claim 2, wherein the temperature compensation circuit comprises a comparison circuit and a compensation voltage generation circuit; the comparison circuit is connected with the temperature receiving end so as to compare the received ambient temperature with a preset temperature; when the environment temperature is lower than the preset temperature, the comparison circuit outputs a driving signal to drive the compensation voltage generation circuit to generate the temperature compensation voltage.
4. The circuit of claim 3, wherein the temperature compensation circuit further comprises a threshold determination unit; the threshold value determining unit is used for determining a preset threshold value according to the corresponding relation between the resistance value of the temperature sensing element and the ambient temperature.
5. The circuit of claim 3, wherein the compensation voltage generation circuit is capable of generating a first compensation voltage or a second compensation voltage, the first compensation voltage being greater than the second compensation voltage; the compensation voltage generation circuit generates the first compensation voltage when the ambient temperature is within a first ring temperature range; the compensation voltage generation circuit generates the second compensation voltage when the ambient temperature is within a second loop temperature range, wherein the temperature of the first loop temperature range is lower than the temperature of the second loop temperature range.
6. The circuit of claim 2, wherein the power management chip comprises a microprocessor; the microprocessor is connected with the temperature receiving end to compare the received ambient temperature with a preset temperature and output a control signal when the ambient temperature is lower than the preset temperature so as to generate temperature compensation voltage.
7. The circuit of claim 1, wherein the temperature sensing element is a temperature sensitive resistor; the first voltage division circuit comprises a first voltage division resistor and the temperature-sensitive resistor which are connected in parallel; the second voltage division circuit comprises a second voltage division resistor; the first end of the first voltage-dividing resistor connected with the temperature-sensitive resistor is grounded, the second end of the first voltage-dividing resistor connected with the temperature-sensitive resistor is connected with one end of the second voltage-dividing resistor, and the other end of the second voltage-dividing resistor is connected to the power supply end of the temperature detection circuit.
8. The circuit according to claim 7, wherein the resistance of the second divider resistor and/or the first divider resistor is adjustable, so that the resistance of the second divider resistor and/or the first divider resistor can be adjusted when the threshold is re-determined.
9. The circuit of claim 7, wherein the power management chip outputs a first reference voltage; the first reference voltage is input to the power supply terminal.
10. A display device, characterized in that the display device comprises a power supply board and a display circuit according to any one of claims 1 to 9; a power management chip is arranged on the power panel; the display circuit is arranged outside the power management chip and electrically connected with the power management chip.
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| CN202111416439.9A CN114123733A (en) | 2021-11-25 | 2021-11-25 | Display circuit and device |
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| CN202111416439.9A CN114123733A (en) | 2021-11-25 | 2021-11-25 | Display circuit and device |
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| CN108806633A (en) * | 2018-07-09 | 2018-11-13 | 深圳市华星光电半导体显示技术有限公司 | The start-up control method and liquid crystal display device of liquid crystal display device |
| CN109616065A (en) * | 2018-12-29 | 2019-04-12 | 武汉华星光电技术有限公司 | The display methods of display panel |
| CN210136714U (en) * | 2019-07-11 | 2020-03-10 | 昆山龙腾光电股份有限公司 | Common voltage driving circuit and display device |
| CN113077736A (en) * | 2021-03-19 | 2021-07-06 | Tcl华星光电技术有限公司 | Control circuit, display device, and electronic apparatus |
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