CN115101020B - Control circuit and display device - Google Patents
Control circuit and display device Download PDFInfo
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- CN115101020B CN115101020B CN202210719408.9A CN202210719408A CN115101020B CN 115101020 B CN115101020 B CN 115101020B CN 202210719408 A CN202210719408 A CN 202210719408A CN 115101020 B CN115101020 B CN 115101020B
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- 101710176204 Transcription cofactor vestigial-like protein 3 Proteins 0.000 description 7
- 206010047571 Visual impairment Diseases 0.000 description 7
- 239000004973 liquid crystal related substance Substances 0.000 description 6
- 101710176146 Transcription cofactor vestigial-like protein 1 Proteins 0.000 description 4
- 101710176144 Transcription cofactor vestigial-like protein 2 Proteins 0.000 description 2
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Classifications
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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
- G09G3/34—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 by control of light from an independent source
- G09G3/36—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 by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0257—Reduction of after-image effects
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/04—Maintaining the quality of display appearance
- G09G2320/041—Temperature compensation
Abstract
The application provides a control circuit and display device mainly relates to and shows technical field, can reduce LCD under the high temperature state and have the risk of residual image. The control circuit comprises a first switch, a first end of the first switch is used for receiving a turn-off voltage signal, a second end of the first switch is used for outputting the turn-off voltage signal when the first switch is turned on, the turn-off voltage signal is used for turning off the array substrate, the control circuit further comprises an adjusting module, the adjusting module comprises a temperature detecting unit and an adjusting unit, and the adjusting unit is respectively connected with the temperature detecting unit and the first switch. The temperature detection unit is used for detecting the temperature of the array substrate, determining the compensation voltage according to the temperature of the array substrate, and the adjustment unit is used for adjusting the voltage of the turn-off voltage signal according to the compensation voltage.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a control circuit and a display device.
Background
The liquid crystal display (Liquid Crystal Display, LCD) may have an afterimage in a long-term operation state, that is, when the LCD switches the displayed frames, an afterimage of one frame of frames remains on the display. When the residual image of the LCD is serious, the display effect of the LCD can be affected.
Disclosure of Invention
In order to solve the above problems, the present application provides a control circuit and a display device, which can reduce the risk of residual image existing in an LCD in a high temperature state.
In a first aspect, the present application provides a control circuit, be applied to display panel, display panel includes array substrate and the opposite substrate of relative setting, control circuit includes first switch, first end of first switch is used for receiving and cuts off voltage signal, the second end of first switch is used for exporting when first switch switches on and cuts off voltage signal, it is used for cutting off array substrate to cut off voltage signal, control circuit still includes adjusting module, adjusting module includes temperature detection unit and adjusting unit, adjusting unit is connected with temperature detection unit and first switch respectively. The temperature detection unit is used for detecting the temperature of the array substrate, determining the compensation voltage according to the temperature of the array substrate, and the adjustment unit is used for adjusting the voltage of the turn-off voltage signal according to the compensation voltage.
In one possible design, the first input end of the adjusting unit is connected with the temperature detecting unit, the second input end of the adjusting unit is used for receiving the turn-off voltage signal, the output end of the adjusting unit is connected with the first end, and the adjusting unit is specifically used for adjusting the voltage of the turn-off voltage signal received by the second input end to be the standard turn-off voltage according to the compensation voltage.
In one possible embodiment, the regulating unit comprises a first operational amplifier and a second operational amplifier. The non-inverting input end of the first operational amplifier is connected with the temperature detection unit, the inverting input end of the first operational amplifier is grounded, the output end of the first operational amplifier is connected with the inverting input end of the second operational amplifier, the non-inverting input end of the second operational amplifier is the second input end of the adjusting unit, and the output end of the second operational amplifier is the output end of the adjusting unit.
In one possible embodiment, the regulating unit further comprises a first buffer, the inverting input of which is connected to the output of the second operational amplifier, and the output of which is the output of the regulating unit.
In one possible design manner, the first input end of the adjusting unit is connected with the temperature detecting unit, the second input end of the adjusting unit is connected with the second end, the output end of the adjusting unit is connected with the array substrate, and the adjusting unit is specifically configured to adjust the voltage of the turn-off voltage signal received by the second input end to be a standard turn-off voltage according to the compensation voltage.
In one possible embodiment, the regulating unit comprises a third operational amplifier and a fourth operational amplifier. The non-inverting input end of the third operational amplifier is connected with the temperature detection unit, the inverting input end of the third operational amplifier is grounded, the output end of the third operational amplifier is connected with the inverting input end of the fourth operational amplifier, the non-inverting input end of the fourth operational amplifier is the second input end of the adjusting unit, and the output end of the fourth operational amplifier is the output end of the adjusting unit.
In one possible embodiment, the regulating unit further comprises a second buffer, the inverting input of which is connected to the output of the fourth operational amplifier, and the output of which is the output of the regulating unit.
In one possible design, the temperature detection unit includes a temperature sensor and a compensation module, the temperature sensor is connected with a third input end of the compensation module, a fourth input end of the compensation module is used for receiving the turn-off voltage signal, an output end of the compensation module is connected with a first input end of the adjustment unit, the temperature sensor is used for converting the temperature of the control circuit into a voltage signal and outputting the voltage signal to the compensation module, and the compensation module is used for determining the compensation voltage according to the voltage signal and the turn-off voltage signal.
In one possible design, the compensation module includes a comparator and a second switch, wherein one input end of the comparator is a third input end of the compensation module, the other input end of the comparator is a fourth input end of the compensation module, an output end of the comparator is connected with one end of the second switch, and the other end of the second switch is an output end of the compensation module.
In a second aspect, the present application further provides a display device, where the display device includes the control circuit according to any one of the optional modes of the first aspect.
The control circuit that this application provided is last to be provided with adjustment module, and this adjustment module is connected with first switch, can be according to array substrate's temperature regulation turn-off voltage signal's voltage for under arbitrary temperature, input for array substrate's turn-off voltage signal's voltage is the standard turn-off voltage that presets under corresponding temperature, thereby avoid TFT in the TFT column base plate leakage current increase to a certain extent, and then avoided under the high temperature state, because leakage current increase leads to LCD to show the phenomenon of afterimage.
The construction of the present application, as well as other objects and advantages thereof, will be described in detail with reference to the accompanying drawings, to ensure that the description of the preferred embodiments is more clearly understood.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort to a person skilled in the art.
Fig. 1 is a schematic diagram of a control circuit according to a first embodiment of the present disclosure;
fig. 2 is a schematic diagram of a control circuit according to a first embodiment of the present disclosure;
FIG. 3 is a schematic diagram illustrating a leakage current variation according to a first embodiment of the present disclosure;
FIG. 4 is a schematic structural diagram of a first temperature sensor module according to an embodiment of the present disclosure;
fig. 5 is a schematic diagram III of a control circuit according to the first embodiment of the present application;
fig. 6 is a schematic diagram of a control circuit according to the first embodiment of the present application;
fig. 7 is a schematic diagram of a control circuit according to an embodiment of the present disclosure;
fig. 8 is a schematic diagram of a control circuit according to an embodiment of the present disclosure;
fig. 9 is a schematic diagram of a control circuit according to an embodiment of the present disclosure.
Wherein, each reference sign in the figure:
1, a level shifter;
2, a first MOS transistor;
3, a second MOS transistor;
4, an adjusting module; 401a temperature detection unit; 402, a regulating unit, 402a, a first input, 402b, a second input, 402c, an output, 4011, a temperature sensor; 4012, a compensation module; 4013, a comparator; 4014, a second switch;
402, an adjustment unit.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved by the present application more clear, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present application and simplify description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system configurations, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, and circuits are omitted so as not to obscure the description of the present application with unnecessary detail.
The liquid crystal display panel generally includes an array substrate, a counter substrate, and a liquid crystal layer, wherein the liquid crystal layer is positioned between the array substrate and the counter substrate.
In the LCD, a control circuit (may also be referred to as a TFT switching circuit) is generally provided for outputting an on Voltage (VGH) and an off Voltage (VGL) to the array substrate to control the on and off of the TFTs so that the LCD realizes image switching. Wherein VGH and VGL are gate control voltages of TFTs in the array substrate, VGH is generally a positive voltage of 13-20V (volts), and the gates of the TFTs can be conducted. VGL is typically a negative voltage of-7.3 to-10V, which can turn off the gate of the TFT.
Illustratively, as shown in fig. 1, a schematic diagram of a control circuit in an LCD includes a level shifter (level shifter) 1, a first MOS transistor 2, and a second MOS transistor 3. The level shifter 1 is connected to the gates of the first MOS transistor 2 and the second MOS transistor 3, and converts the digital signal into a data voltage and outputs the data voltage to the first MOS transistor 2 and the second MOS transistor 3 after receiving the digital signal. The level shifter 1 controls the on-off states of the first MOS transistor 2 and the second MOS transistor 3 by the output data voltage.
The source of the first MOS transistor 2 is for receiving a turn-on Voltage (VGH), and the drain is connected to the array substrate. The second MOS transistor 3 has a drain for receiving a turn-off Voltage (VGL), and a source connected to the array substrate. VGH and VGL may be output by corresponding voltage generation modules (e.g., power integrated circuits (power ICs)).
When the first MOS transistor 2 is turned on and the second MOS transistor 3 is turned off, for example, when the data voltage output from the level shifter 1 is 3.3V, the first MOS transistor 2 is turned on and the second MOS transistor 3 is turned off. The control circuit outputs VGH to the array substrate through the first MOS transistor 2 to drive TFTs in the array substrate to be turned on, thereby causing LCD display.
When the first MOS transistor 2 is turned off and the second MOS transistor 3 is turned on, for example, when the data voltage output from the level shifter 1 is 0V, the first MOS transistor 2 is turned off and the second MOS transistor 3 is turned on. The control circuit outputs VGL to the array substrate through the second MOS transistor 3 to drive TFTs in the array substrate to be turned off, so that the LCD does not display.
Currently, an LCD may have an afterimage in a state of being operated for a long time. The reason for this is that an increase in the leakage current Ioff of the TFT at a high temperature causes polarization of the liquid crystal, and thus an afterimage occurs. By exploring and analyzing the cause of the increase in the leakage current Ioff of the TFT, the present inventors found the relationship between the leakage current Ioff and VGL. That is, the off-voltage VGL of the TFT may drift as the temperature increases, that is, the off-voltage VGL of the TFT may increase or decrease (i.e., VGL is smaller than VGL1 or VGL is greater than VGL 1) in a high temperature state compared to the off-voltage at normal temperature state (assumed to be represented as VGL 1). If the control circuit still controls the gate off of the TFT through the output VGL1 in a high temperature state, the leakage current Ioff of the TFT increases.
Therefore, the application provides a control circuit and a display device, which can adjust the turn-off voltage according to the temperature of the array substrate so as to avoid the increase of leakage current to a certain extent and further avoid the phenomenon of residual image of the LCD caused by the leakage current in a high-temperature state to a certain extent.
The control circuit and the display device provided in the present application are exemplarily described below with reference to the accompanying drawings.
Example 1
The control circuit provided by the embodiment of the application comprises a first switch and an adjusting module. The first switch is a switch for controlling the turn-off of the array substrate, a first end of the first switch is used for receiving a turn-off voltage signal, a second end of the first switch is used for outputting the turn-off voltage signal when the first switch is turned on, and the turn-off voltage signal is used for turning off the array substrate.
The first switch may be, for example, a second MOS transistor 3 in the control circuit shown in fig. 1, and the first terminal is the drain of the second MOS transistor 3, and the second terminal is the source of the second MOS transistor 3. It is also understood that the first switch may be a P-type mos transistor, a switching diode, or other switching transistors, which is not particularly limited in this application.
In this embodiment of the application, control circuit is provided with adjustment module, and this adjustment module is connected with first switch, can be according to array substrate's temperature regulation turn-off voltage signal's voltage for at arbitrary temperature, the voltage of the turn-off voltage signal of input for array substrate is the standard turn-off voltage of predetermineeing under the corresponding temperature, thereby avoids TFT's leakage current increase in the TFT column substrate to a certain extent, and then has avoided under the high temperature state, because leakage current increase leads to LCD to show the phenomenon of afterimage.
The adjusting module may include a temperature detecting unit and an adjusting unit, where the adjusting unit is connected to the temperature detecting unit and the first switch, and the temperature detecting unit 402 is configured to detect a temperature of the array substrate, and determine the compensation voltage according to the temperature of the array substrate. For example, the compensation voltage may be a difference between the off voltage VGL1 at normal temperature and a standard off voltage preset at a corresponding temperature. The adjustment unit may adjust the voltage of the off-voltage signal according to the compensation voltage.
The control circuit provided in the present application will be exemplarily described below taking the first switch as the second MOS transistor 3 as an example.
Assuming that the standard off voltage at the corresponding temperature is represented as VGL, the voltage of the off voltage signal output by the voltage generation module is represented as VGL1 (i.e., the off voltage in the normal temperature state). Wherein, at normal temperature, VGL1 is equal to VGL, and when the temperature of the array substrate increases, VGL of the array substrate at this high temperature is not equal to VGL1.
In one example, as shown in fig. 2, the circuit diagram of the control circuit may be that a first input terminal 402a of the adjusting unit 402 in the adjusting module 4 is connected to the temperature detecting unit 401, a second input terminal 402b of the adjusting unit 402 is used for receiving the off voltage signal, an output terminal 402c of the adjusting unit 402 is connected to the first terminal b, and the adjusting unit 402 is specifically used for adjusting the voltage of the off voltage signal received by the second input terminal 402b according to the compensation voltage. The off voltage signal received by the second input terminal 402b is an off voltage signal output by the voltage generating module, that is, the voltage of the off voltage signal received by the second input terminal 402b is VGL1 in a normal temperature state.
In this example, the adjusting module 4 may be connected to the first end b of the first switch 3, and adjust the voltage of the off voltage signal before the off voltage signal is input to the first switch 3, so that the voltage of the off voltage signal received by the first switch 3 is the standard off voltage VGL at the corresponding temperature, and further, the first switch 3 can directly output the standard off voltage VGL at the corresponding temperature to the array substrate in the on state.
The standard off voltage VGL at the corresponding temperature may be obtained statistically in advance. Exemplary, as shown in fig. 3, is a graph of the relationship between the gate control voltage of the TFT and the leakage current Ioff. And counting the gate control voltage with the smallest leakage current Ioff at different temperatures as a standard off voltage VGL.
For example, assuming normal temperature (e.g., 23 ℃) the standard off-voltage of the TFT is-7V (i.e., vgl1= -7V). When the temperature of the array substrate rises to 40 ℃, assuming that the preset standard turn-off voltage at the temperature is-8V (V), the temperature detection unit 401 may output-1V as the compensation voltage according to the detected temperature, and the adjustment unit 402 may weight the compensation voltage-1V and VGL1 at normal temperature, that is, -1-7= -8V, and then output the corresponding standard turn-off voltage-8V at 40 ℃ to the array substrate to control TFT turn-off. The phenomenon that the leakage current Ioff is increased and afterimage is generated due to the fact that the VGL1 is used for controlling the turn-off of the array substrate all the time is avoided.
The temperature detecting unit 401 is configured to detect a temperature of the array substrate, and convert the detected temperature of the array substrate into a compensation voltage at the temperature. In one example, as shown in fig. 4, the temperature detection unit 401 may include a temperature sensor 4011 and a compensation module 4012, the temperature sensor 4011 is connected to a third input 4013a of the compensation module 4012, a fourth input 4013b of the compensation module 4012 is configured to receive a turn-off voltage signal (i.e., may be connected to a voltage transmission module configured to output the turn-off voltage signal, when the voltage of the turn-off voltage signal is VGL 1), and an output 401a of the compensation module 4012 is connected to a first input 402a of the adjustment unit 402.
In the embodiment of the present application, the temperature sensor 4011 is configured to sense an ambient temperature (i.e., a temperature of the array substrate), and convert the detected temperature of the control circuit into a high-precision voltage signal for output. The compensation module 4012 is configured to determine a compensation voltage VGL2 according to a voltage VGL1 of the high-precision voltage signal and the off-voltage signal output from the temperature sensor 4011.
In this instance, the temperature sensor 4011 may be set according to standard off-voltages at different temperatures counted in advance, so that the temperature sensor 4011 may output a high-precision voltage signal according to a conversion relationship between a preset temperature and a voltage. It can be understood that the voltage of the high-precision voltage signal is the standard off voltage VGL at the corresponding temperature.
In one example, as shown in fig. 4, the compensation module 4012 may include a comparator 4013 and a second switch 4014, wherein an input 4013a of the comparator 4013 is a third input 4013a of the compensation module 4012, another input 4013b of the comparator 4013 is a fourth input 4013b of the compensation module 4012, an output of the comparator 4013 is connected to one end of the second switch 4014, and another end of the second switch 4014 is an output 401a of the compensation module 4012.
The second switch may be a P-type triode as shown in fig. 2, or may be a switching tube such as a diode, a switching diode or a resonant soft switch, which is not limited in this application.
For example, it is assumed that the standard off voltage VGL of the TFT is-7V (i.e., vgl=vgl1= -7V) at normal temperature (e.g., 23 ℃). At 40 ℃, the corresponding standard off voltage VGL is vgl3= -8V. When the temperature sensor 4011 detects that the temperature of the array substrate increases to 40 ℃, the temperature sensor 4011 can output VGL3 according to a preset conversion relationship between temperature and voltage, and output VGL3 to the comparator 4013.
The comparator 4013 may compare the received VGL3 and VGL1 to determine the compensation voltage vgl2=vgl3-vgl1= -8+7 = -1V. The comparator 4013 outputs the compensation voltage VGL2 to the second switch 4014.
Alternatively, if the absolute value of the compensation voltage VGL2 is smaller than the preset threshold (e.g., 0.1, 0.3, etc.), the comparator 4013 may not output the compensation voltage VGL2.
The second switch 4014 is turned on when receiving the compensation voltage VGL2, and outputs VGL2 to the adjusting unit 402.
In one example, the adjusting unit may include a first operational amplifier and a second operational amplifier, the non-inverting input terminal of the first operational amplifier is connected to the first temperature detecting unit, the inverting input terminal of the first operational amplifier is grounded, the output terminal of the first operational amplifier is connected to the inverting input terminal of the second operational amplifier, the non-inverting input terminal of the second operational amplifier is configured to receive the off voltage VGL, that is, the non-inverting input terminal of the second operational amplifier is the second input terminal of the adjusting unit, and the output terminal of the second operational amplifier is connected to the first terminal b of the MOS transistor, that is, the output terminal of the second operational amplifier is the output terminal of the adjusting unit.
As an example, as shown in fig. 5, the circuit diagram of the adjusting unit 402 may be that the adjusting unit 402 specifically includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first operational amplifier A1, and a second operational amplifier A2. One end of the first resistor R1 is grounded, the other end of the first resistor R1 is connected with one end of the second resistor R2, the other end of the second resistor R2 is connected with the output end A1a of the first operational amplifier A1, one end of the third resistor R3 is connected with the output end A1a of the first operational amplifier A1, the other end of the third resistor R3 is connected with the output end A2a of the second operational amplifier A2, and one end of the fourth resistor R4 is connected with the non-inverting input (as shown in the "+" end of the A2 in FIG. 3) end of the second operational amplifier A2.
The "+" end of the first operational amplifier A1 is configured to receive the compensation voltage output by the first temperature detecting unit 401, and output the compensation voltage to the second operational amplifier A2 after performing amplification calibration.
Alternatively, the first operational amplifier A1 may be an in-phase operational amplifier, where the stability of the in-phase operational amplifier is strong, so that the compensation voltage received by the "+" end of the first operational amplifier A1 is amplified and calibrated and then output through the output end A1 a.
The "-" end of the second operational amplifier A2 is configured to receive the compensation voltage signal output by the first operational amplifier A1, the "+" end is configured to receive the turn-off voltage, and the second operational amplifier A2 weights the compensation voltage and VGL1 (i.e., adds the compensation voltage and VGL 1) and outputs the weighted compensation voltage and VGL1 to the first end b of the first switch 3, so as to obtain the standard turn-off voltage at the corresponding temperature.
Alternatively, the second operational amplifier A2 may be an integrated operational amplifier, and the purpose of weighting the voltages received at the "-" end and the "+" end of the second operational amplifier A2 and outputting the weighted voltages is achieved.
For example, it is assumed that the standard off voltage VGL of the TFT is-7V (i.e., vgl=vgl1= -7V) at normal temperature (e.g., 23 ℃). At 40 ℃, the corresponding standard off voltage VGL is vgl3= -8V. When the temperature sensor 4011 detects that the temperature of the array substrate rises to 40 ℃, the temperature detecting unit 401 may output the compensation voltage VGL2 to the first operational amplifier A1, the first operational amplifier A1 performs calibration processing on the VGL2 and outputs the calibration result to the second operational amplifier A2, and the second operational amplifier A2 weights VGL2 and VGL1, that is, vgl3=vgl2+vgl1= -7+ -1= -8V, so that the second operational amplifier A2 outputs VGL3 to the array substrate.
In one example, in order that the standard off voltage VGL output from the adjusting unit 402 may be stably output to the first terminal b of the first switch, as shown in fig. 6, a first buffer A3 may be provided in the adjusting unit 402, an inverting input terminal (a "-" terminal of A3 as shown in fig. 6) of the first buffer A3 is connected to the output terminal A1a of the second operational amplifier A2, and an output terminal A3a of the first buffer A3 is connected to the first terminal b of the first switch 3. The first buffer A3 is provided at the output terminal A1a of the second operational amplifier A2, so that signal loss caused by a higher impedance of the output (i.e., the output terminal of the second operational amplifier A2) and a lower impedance of the input of the next stage (the first terminal b of the first switch 3) can be avoided to some extent.
It can be understood that, in the embodiment of the present application, the adjusting module 4 may adjust the off voltage signal input by the first terminal b of the first switch 3 as shown in fig. 2, and may also adjust the off voltage signal output by the second terminal c of the first switch 3.
For example, in another example, as shown in fig. 7, the circuit diagram of the control circuit may also be that the first input terminal 402a of the adjusting unit 402 is connected to the temperature detecting unit 401, the second input terminal 402b of the adjusting unit 402 is connected to the second terminal c, the output terminal of the adjusting unit 402 is connected to the array substrate, and the adjusting unit 402 is specifically configured to adjust the voltage of the off-voltage signal received by the second input terminal 402b according to the compensation voltage. The voltage of the off voltage signal received by the adjusting unit 402 is VGL1 in a normal temperature state.
In this example, the adjusting module 4 may adjust the voltage of the turn-off voltage signal received by the first switch 3, so that the voltage of the turn-off voltage signal received by the first switch 3 is the standard turn-off voltage at the corresponding temperature, and the voltage output to the array substrate is the standard turn-off voltage VGL.
The specific structure of the temperature detecting unit 401 may be referred to the structure shown in fig. 5, and is not described herein.
In one example, the adjusting unit includes a third operational amplifier and a fourth operational amplifier. The non-inverting input end of the third operational amplifier is connected with the temperature detection unit, the inverting input end of the third operational amplifier is grounded, the output end of the third operational amplifier is connected with the inverting input end of the fourth operational amplifier, the non-inverting input end of the fourth operational amplifier is the second input end of the adjusting unit, and the output end of the fourth operational amplifier is the output end of the adjusting unit.
As an example, the circuit diagram of the adjusting unit 402 may be as shown in fig. 8, and the adjusting unit 402 further includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a third operational amplifier A4, and a fourth operational amplifier A5. One end of the first resistor R1 is grounded, the other end of the first resistor R1 is connected with one end of the second resistor R2, the other end of the second resistor R2 is connected with the output end A4a of the third operational amplifier A4, one end of the third resistor R3 is connected with the output end A4a of the third operational amplifier A4, the other end of the third resistor R3 is connected with the output end A3a of the fourth operational amplifier A5, and one end of the fourth resistor R4 is connected with the non-inverting input end (as shown in "+" end of A5 in fig. 8) of the fourth operational amplifier A5.
The "+" end of the third operational amplifier A4 is configured to receive the compensation voltage output by the temperature detecting unit 401, and output the compensation voltage to the fourth operational amplifier A5 after performing amplification calibration.
Optionally, the third operational amplifier A4 may be an in-phase operational amplifier, where stability of the in-phase operational amplifier is strong, so that the compensation voltage signal received by the "+" end of the third operational amplifier A4 is output through the output end A4a after being amplified and calibrated.
The "-" end of the fourth operational amplifier A5 is configured to receive the compensation voltage signal output by the third operational amplifier A4, the "+" end is configured to receive the turn-off voltage signal output by the second end c of the first switch 5, and the fourth operational amplifier A5 weights (i.e., adds the compensation voltage signal to the turn-off voltage signal) the compensation voltage and outputs the weighted result to the array substrate, so as to obtain the standard turn-off voltage at the corresponding temperature.
Optionally, the fourth operational amplifier A5 may be an integrated operational amplifier, so that the purpose of weighting the voltages received at the "-" end and the "+" end of the fourth operational amplifier A5 and outputting the weighted voltages is achieved.
In one example, in order that the off voltage VGL output from the adjusting unit 402 may be stably output to the array substrate, as shown in fig. 9, a second buffer A6 may be disposed in the adjusting unit 402, and an inverting input terminal (a "-" terminal of A6 shown in fig. 9) of the second buffer A6 is connected to the output terminal A4a of the fourth operational amplifier a53, and an output terminal A6a of the second buffer A6 is connected to the array substrate. The second buffer A6 is disposed behind the output terminal A4a of the fourth operational amplifier A5, so that signal loss caused by a higher impedance of the output (i.e., the output terminal of the fourth operational amplifier A5) and a lower impedance of the input (i.e., the array substrate) of the next stage can be avoided to a certain extent.
Example two
The second embodiment of the present application further provides a display device, where the display device includes at least one control circuit as described in the first embodiment.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.
Claims (8)
1. The control circuit is applied to a display panel, the display panel comprises an array substrate and a counter substrate which are oppositely arranged, the control circuit comprises a first switch, a first end of the first switch is used for receiving a turn-off voltage signal, a second end of the first switch is used for outputting the turn-off voltage signal when the first switch is turned on, and the turn-off voltage signal is used for turning off the array substrate, and the control circuit is characterized by further comprising an adjusting module, wherein the adjusting module comprises a temperature detecting unit and an adjusting unit, and the adjusting unit is respectively connected with the temperature detecting unit and the first switch;
the temperature detection unit is used for detecting the temperature of the array substrate and determining compensation voltage according to the temperature of the array substrate;
the adjusting unit is used for adjusting the voltage of the turn-off voltage signal according to the compensation voltage;
the temperature detection unit comprises a temperature sensor and a compensation module, the temperature sensor is connected with a third input end of the compensation module, a fourth input end of the compensation module is used for receiving the turn-off voltage signal, and an output end of the compensation module is connected with a first input end of the adjusting unit;
the temperature sensor is used for converting the temperature of the control circuit into a voltage signal and outputting the voltage signal to the compensation module, and the compensation module is used for determining the compensation voltage according to the voltage signal and the turn-off voltage signal;
wherein the voltage signal is a standard turn-off voltage at a corresponding temperature;
the compensation module comprises a comparator and a second switch, wherein one input end of the comparator is a third input end of the compensation module, the other input end of the comparator is a fourth input end of the compensation module, the output end of the comparator is connected with one end of the second switch, and the other end of the second switch is an output end of the compensation module;
if the absolute value of the compensation voltage is smaller than a preset threshold value, the comparator does not output the compensation voltage;
the second switch is turned on when receiving the compensation voltage, and outputs the compensation voltage to the adjusting unit.
2. The control circuit according to claim 1, wherein a first input of the regulating unit is connected to the temperature detecting unit, a second input of the regulating unit is configured to receive the off-voltage signal, an output of the regulating unit is connected to the first end, and the regulating unit is specifically configured to regulate the voltage of the off-voltage signal received by the second input according to the compensation voltage.
3. The control circuit of claim 2, wherein the regulating unit comprises a first operational amplifier and a second operational amplifier;
the non-inverting input end of the first operational amplifier is connected with the temperature detection unit, the inverting input end of the first operational amplifier is grounded, the output end of the first operational amplifier is connected with the inverting input end of the second operational amplifier, the non-inverting input end of the second operational amplifier is the second input end of the adjusting unit, and the output end of the second operational amplifier is the output end of the adjusting unit.
4. A control circuit according to claim 3, wherein the regulating unit further comprises a first buffer, the inverting input of the first buffer being connected to the output of the second operational amplifier, the output of the first buffer being the output of the regulating unit.
5. The control circuit according to claim 1, wherein a first input terminal of the adjusting unit is connected to the temperature detecting unit, a second input terminal of the adjusting unit is connected to the second terminal, an output terminal of the adjusting unit is connected to the array substrate, and the adjusting unit is specifically configured to adjust a voltage of the off-voltage signal received by the second input terminal according to the compensation voltage.
6. The control circuit of claim 1, wherein the regulating unit comprises a third operational amplifier, a fourth operational amplifier;
the non-inverting input end of the third operational amplifier is connected with the temperature detection unit, the inverting input end of the third operational amplifier is grounded, the output end of the third operational amplifier is connected with the inverting input end of the fourth operational amplifier, the non-inverting input end of the fourth operational amplifier is the second input end of the adjusting unit, and the output end of the fourth operational amplifier is the output end of the adjusting unit.
7. The control circuit of claim 6, wherein the regulating unit further comprises a second buffer, an inverting input of the second buffer being coupled to an output of the fourth operational amplifier, the output of the second buffer being an output of the regulating unit.
8. A display device, characterized in that the display device comprises a control circuit as claimed in any one of claims 1-7.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210719408.9A CN115101020B (en) | 2022-06-23 | 2022-06-23 | Control circuit and display device |
| PCT/CN2022/141076 WO2023246043A1 (en) | 2022-06-23 | 2022-12-22 | Control circuit and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210719408.9A CN115101020B (en) | 2022-06-23 | 2022-06-23 | Control circuit and display device |
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| CN115101020A CN115101020A (en) | 2022-09-23 |
| CN115101020B true CN115101020B (en) | 2024-01-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210719408.9A Active CN115101020B (en) | 2022-06-23 | 2022-06-23 | Control circuit and display device |
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| WO (1) | WO2023246043A1 (en) |
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| CN115101020B (en) * | 2022-06-23 | 2024-01-26 | 惠科股份有限公司 | Control circuit and display device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1914662A (en) * | 2004-01-29 | 2007-02-14 | 皇家飞利浦电子股份有限公司 | Active matrix display device |
| CN104361874A (en) * | 2014-11-20 | 2015-02-18 | 京东方科技集团股份有限公司 | Temperature compensating circuit and method and liquid crystal display |
| CN106560881A (en) * | 2015-10-01 | 2017-04-12 | 三星显示有限公司 | Display Device And Operating Method Thereof |
| CN108880215A (en) * | 2017-05-15 | 2018-11-23 | 厦门雅迅网络股份有限公司 | A kind of DC-DC power source low pressure switches off control circuit |
| CN112840576A (en) * | 2018-10-31 | 2021-05-25 | 华为技术有限公司 | Temperature compensation circuit and phased array device |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100683519B1 (en) * | 1999-12-23 | 2007-02-15 | 엘지.필립스 엘시디 주식회사 | Circuit And Method for Compensating a Charging Characteristic of Liquid Crystal Panel |
| JP2009294306A (en) * | 2008-06-03 | 2009-12-17 | Sharp Corp | Display device and driving method of display device |
| KR20100005558A (en) * | 2008-07-07 | 2010-01-15 | 엘지디스플레이 주식회사 | Temperature compensating circuit of liquid crystal display device) |
| CN103280199B (en) * | 2013-04-19 | 2015-08-19 | 合肥京东方光电科技有限公司 | A kind of circuit and array base palte eliminating power-off ghost shadow |
| CN113012654B (en) * | 2021-03-03 | 2022-10-11 | 昆山龙腾光电股份有限公司 | Grid driving power supply management system and display device |
| CN115101020B (en) * | 2022-06-23 | 2024-01-26 | 惠科股份有限公司 | Control circuit and display device |
-
2022
- 2022-06-23 CN CN202210719408.9A patent/CN115101020B/en active Active
- 2022-12-22 WO PCT/CN2022/141076 patent/WO2023246043A1/en unknown
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1914662A (en) * | 2004-01-29 | 2007-02-14 | 皇家飞利浦电子股份有限公司 | Active matrix display device |
| CN104361874A (en) * | 2014-11-20 | 2015-02-18 | 京东方科技集团股份有限公司 | Temperature compensating circuit and method and liquid crystal display |
| CN106560881A (en) * | 2015-10-01 | 2017-04-12 | 三星显示有限公司 | Display Device And Operating Method Thereof |
| CN108880215A (en) * | 2017-05-15 | 2018-11-23 | 厦门雅迅网络股份有限公司 | A kind of DC-DC power source low pressure switches off control circuit |
| CN112840576A (en) * | 2018-10-31 | 2021-05-25 | 华为技术有限公司 | Temperature compensation circuit and phased array device |
Non-Patent Citations (1)
| Title |
|---|
| 高精度电荷域ADC共模电荷误差前台校准电路;陈珍海;魏敬和;于宗光;苏小波;薛颜;张鸿;;西安电子科技大学学报(第06期);第138-143页 * |
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| WO2023246043A1 (en) | 2023-12-28 |
| CN115101020A (en) | 2022-09-23 |
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