CN119007678B - Temperature compensation circuit, display panel, and display device - Google Patents
Temperature compensation circuit, display panel, and display deviceInfo
- Publication number
- CN119007678B CN119007678B CN202411214993.2A CN202411214993A CN119007678B CN 119007678 B CN119007678 B CN 119007678B CN 202411214993 A CN202411214993 A CN 202411214993A CN 119007678 B CN119007678 B CN 119007678B
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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
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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
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- Crystallography & Structural Chemistry (AREA)
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- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
The embodiment of the application relates to a temperature compensation circuit, a display panel and a display device, wherein the circuit comprises a temperature detection module and a voltage selection module, the output end of the temperature detection module is connected with the input end of the voltage selection module, the temperature detection module is used for detecting the current temperature of the display panel and outputting a temperature signal representing the temperature, the voltage selection module is used for outputting a first voltage when the temperature signal represents that the current temperature is larger than a preset temperature and outputting a second voltage when the temperature signal represents that the current temperature is smaller than or equal to the preset temperature, and the first voltage is smaller than the second voltage. The embodiment of the application realizes real-time detection of the temperature of the display panel and outputs stable voltage according to the change of the temperature, so that the voltage of the gate control circuit can be automatically increased when the temperature of the display panel is lower, and the increased voltage is stable, thereby the display panel can stably display in a low-temperature environment.
Description
Technical Field
The present application relates to the field of display panels, and more particularly, to a temperature compensation circuit, a display panel, and a display device.
Background
At present, the refresh rate of the display is higher and higher, and accordingly, the scanning time (1H) of each row is smaller, and the high-potential output time of the GDL is smaller, which affects the driving capability at low temperature. Typical low temperature verification requires that the display be able to function properly at either-10 or-20 ℃, and therefore requires an increase in VGH voltage of the gate to increase the driving capability of the panel. In addition, in a high temperature environment, it is necessary to reduce the VGH voltage to reduce the driving current, and to prevent the problem of polarization of the liquid crystal caused by the local temperature of the panel and the driving current being too high.
In order to boost the VGH voltage in a low temperature environment, a conventional method is to directly use a temperature compensation circuit module to realize the voltage requirements at different temperatures. However, the resistance of the thermistor in the temperature compensation circuit is linear along with the temperature compensation, so that the temperature compensation voltage is also linear along with the temperature, and the temperature compensation voltage is in an unstable state. The unstable temperature compensation voltage can cause that a TFT switch in the display panel can not be stably opened or closed, and the normal display of the panel is affected. In a high temperature environment, the VGH voltage cannot be stabilized at a lower voltage, which may cause a problem of polarization of liquid crystal in a portion of the display panel.
Disclosure of Invention
In view of the above, in order to solve some or all of the above problems, embodiments of the present application provide a temperature compensation circuit, a display panel and a display device.
In a first aspect, an embodiment of the application provides a temperature compensation circuit, which comprises a temperature detection module and a voltage selection module, wherein the output end of the temperature detection module is connected with the input end of the voltage selection module, the temperature detection module is used for detecting the current temperature of a display panel and outputting a temperature signal representing the temperature, the voltage selection module is used for outputting a first voltage when the temperature signal represents that the current temperature is larger than a preset temperature and outputting a second voltage when the temperature signal represents that the current temperature is smaller than or equal to the preset temperature, and the first voltage is smaller than the second voltage.
In one possible embodiment, the temperature detection module is configured to convert the current temperature into an induced voltage representing a temperature magnitude, and output the induced voltage as a temperature signal to the voltage selection module.
In one possible implementation mode, the temperature detection module comprises a current source, a thermistor and a matching resistor, wherein the thermistor and the matching resistor form a temperature sensing resistor network, a current output end of the current source is connected with the resistor network, current is input to the resistor network, and the resistor network is used for generating sensing voltage under the action of the current.
In one possible embodiment, the matching resistor includes a parallel resistor and a voltage dividing resistor, the parallel resistor is connected in parallel with the thermistor, one end of the voltage dividing resistor is grounded, and the other end of the voltage dividing resistor is connected with the thermistor and the parallel resistor.
In one possible implementation manner, the voltage selection module comprises a first switch, a second switch, a first pull-up resistor, a second pull-up resistor, a first pull-down resistor and a second pull-down resistor, wherein the control end of the first switch is connected with a first external voltage input end, the input end of the first switch is connected with a second external voltage input end through the first pull-up resistor, the output end of the first switch is connected with a grounding end through the pull-down resistor and is connected with the output end of the temperature detection module, the control end of the second switch is connected with the output end of the temperature detection module, the input end of the second switch is connected with a second external voltage input end through the second pull-up resistor, the output end of the second switch is connected with the grounding end through the second pull-down resistor and is connected with the first external voltage input end, and the input end of the second switch is connected with the voltage output end of the voltage selection module.
In one possible implementation, the first switch comprises a first triode and a first current limiting resistor, the second switch comprises a second triode and a second current limiting resistor, the base electrode of the first triode is connected with one end of the first current limiting resistor, the other end of the first current limiting resistor is a control end of the first switch, the base electrode of the second triode is connected with one end of the second current limiting resistor, and the other end of the second current limiting resistor is a control end of the second switch.
In one possible implementation, the first switch includes a first field effect transistor, the second switch includes a second field effect transistor, a gate of the first field effect transistor is a control terminal of the first switch, and a gate of the second field effect transistor is a control terminal of the second switch.
In one possible implementation manner, the voltage selection module comprises a first external voltage input end, a second external voltage input end, a temperature signal input end and a voltage output end, the voltage selection module comprises a comparator, a third switch, a third pull-up resistor and a third pull-down resistor, the first input end of the comparator is connected with the output end of the temperature detection module, the second input end of the comparator is connected with the first external voltage input end, the output end of the comparator is connected with the control end of the third switch through the third current limiting resistor, the input end of the third switch is connected with the second external voltage input end through the third pull-up resistor, the output end of the third switch is connected with the ground through the third pull-down resistor, and the input end of the third switch is connected with the voltage output end of the voltage selection module.
In a second aspect, an embodiment of the present application provides a display panel, where the display panel includes a panel main body, a panel circuit board, and the panel circuit board is connected to the panel main body, and the panel circuit board is disposed at an edge of the panel main body, and the panel circuit board is provided with the temperature compensation circuit described in the first aspect, and a voltage output end of a voltage selection module included in the temperature compensation circuit is connected to a power input end of a scan driving circuit on the panel main body.
In a third aspect, an embodiment of the present application provides a display device, including the display panel, the panel frame, the power module, and the data receiving module described in the second aspect, where the display panel is mounted on the panel frame, a power supply end of the display panel is connected to the power module, and a signal receiving end of the display panel is connected to the data receiving module.
According to the temperature compensation circuit, the display panel and the display device provided by the embodiment of the application, the temperature detection module and the voltage selection module are arranged in the temperature compensation circuit, the temperature detection module detects the current temperature of the display panel and outputs the temperature signal representing the temperature, the voltage selection module outputs the first voltage when the temperature signal represents that the current temperature is larger than the preset temperature, and outputs the second voltage when the temperature signal represents that the current temperature is smaller than or equal to the preset temperature, wherein the first voltage is smaller than the second voltage. The embodiment of the application realizes real-time detection of the temperature of the display panel and outputs stable voltage according to the change of the temperature, so that when the temperature of the display panel is low, the voltage of the gate control circuit can be automatically increased, the increased voltage is stable, and a TFT switch in the display panel can be stably opened or closed, so that the display panel can stably display pictures in a low-temperature environment. When the temperature of the display panel is higher, the voltage of the gate control circuit can be automatically reduced, and the reduced voltage is stable, so that the driving current of the panel is stabilized at a smaller current value, and the risk of liquid crystal polarization problem in the local part of the display panel is reduced. The temperature compensation circuit provided by the embodiment of the application can provide stable voltage under high and low temperature environments, so that the display effect of the display panel under various temperature environments is more stable, and the image quality is less influenced by temperature change.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.
In order to more clearly illustrate the embodiments of the application or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.
One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures of the drawings are not to be taken in a limiting sense, unless otherwise indicated.
Fig. 1 is a schematic diagram of a temperature compensation circuit according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a correspondence relationship between voltage and temperature output by a voltage selection module according to an embodiment of the present application;
Fig. 3 is a schematic structural diagram of a temperature detection module according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of another temperature detection module according to an embodiment of the present application;
Fig. 5 is a schematic structural diagram of a voltage selection module according to an embodiment of the present application;
FIG. 6 is a schematic diagram of another voltage selection module according to an embodiment of the present application;
FIG. 7 is a schematic diagram of another voltage selection module according to an embodiment of the present application;
FIG. 8 is a schematic diagram of another voltage selection module according to an embodiment of the present application;
Fig. 9 is a schematic structural diagram of a display panel according to an embodiment of the present application;
Fig. 10 is a schematic structural diagram of a display device according to an embodiment of the present application.
Reference numerals:
100-temperature compensation circuit, 101-temperature detection module, 1011-current source, 1012-resistor network, 102-voltage selection module, 900-display panel, 901 panel main body, 902-panel circuit board, display device 1000, 1001-panel frame, 1002-power module, 1003-data receiving module.
Detailed Description
Various exemplary embodiments of the application will now be described in detail with reference to the accompanying drawings, it being apparent that the described embodiments are some, but not all embodiments of the application. It should be noted that the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise.
It will be appreciated by those skilled in the art that terms such as "first," "second," and the like in the embodiments of the present application are used merely to distinguish between different steps, devices or modules and the like, and do not represent any particular technical meaning or logical sequence therebetween.
It should also be understood that in this embodiment, "plurality" may refer to two or more, and "at least one" may refer to one, two or more.
It should also be appreciated that any component, data, or structure referred to in an embodiment of the application may be generally understood as one or more without explicit limitation or the contrary in the context.
In addition, the term "and/or" in the present application is merely an association relation describing the association object, and indicates that three kinds of relations may exist, for example, a and/or B may indicate that a exists alone, and a and B exist together, and B exists alone. In the present application, the character "/" generally indicates that the front and rear related objects are an or relationship.
It should also be understood that the description of the embodiments of the present application emphasizes the differences between the embodiments, and that the same or similar features may be referred to each other, and for brevity, will not be described in detail.
The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses.
Techniques, circuits, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate.
It should be noted that like reference numerals and letters refer to like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. For an understanding of embodiments of the present application, the present application will be described in detail below with reference to the drawings in conjunction with the embodiments. It will be apparent that the described embodiments are some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Fig. 1 is a schematic structural diagram of a temperature compensation circuit according to an embodiment of the present application, which is generally applied to a display panel, and specifically includes a temperature detection module 101 and a voltage selection module 102. An output terminal of the temperature detection module 101 is connected to an input terminal of the voltage selection module 102.
In this embodiment, the temperature detection module 101 is configured to detect a current temperature of the display panel, and output a temperature signal indicating a temperature level. As shown in fig. 1, VT represents a temperature signal.
Specifically, the temperature detection module 101 may include a temperature sensor that may detect the temperature of the display panel and output a signal representing the temperature. The output temperature signal may be various types of signals, for example, may be a voltage signal, a current signal, or a digital signal.
The voltage selection module 102 is configured to output a first voltage when the temperature signal indicates that the current temperature is greater than a preset temperature, and output a second voltage when the temperature signal indicates that the current temperature is less than or equal to the preset temperature, where the first voltage is less than the second voltage. Uo represents the voltage output by the voltage selection module 102 as shown in fig. 1. In general, as shown in fig. 1, uo may be output to a scan driving circuit of a display panel as a driving voltage VGH of the scan driving circuit.
As shown in fig. 2, a schematic diagram of the correspondence between the voltage and the temperature output by the voltage selection module 102 is shown. Wherein, T1 represents the preset temperature, uo1 is a first voltage output when the current temperature is greater than T1, and Uo2 is a second voltage output when the current temperature is less than or equal to T1.
The first voltage and the second voltage can be respectively provided by different power supply modules, and the first voltage can be obtained by dividing the second voltage through a resistor.
Alternatively, the voltage selection module 102 may include a unit having a voltage comparison function, preset voltage representing a preset temperature, and switch to the first voltage through the switching element if the voltage value represented by the temperature signal is greater than (or less than) the preset voltage, and switch to the second voltage through the switching element if the voltage value represented by the temperature signal is greater than (or less than) the preset voltage.
Optionally, the voltage selection module 102 further includes a device with logic processing capability, such as an MCU, etc., and the MCU can compare the temperature signal detected in real time with a preset temperature signal, and switch between the first voltage and the second voltage according to the comparison result.
According to the temperature compensation circuit provided by the embodiment of the application, the temperature detection module and the voltage selection module are arranged in the temperature compensation circuit, the temperature detection module detects the current temperature of the display panel and outputs the temperature signal representing the temperature, the voltage selection module outputs the first voltage when the temperature signal represents that the current temperature is larger than the preset temperature, and outputs the second voltage when the temperature signal represents that the current temperature is smaller than or equal to the preset temperature, wherein the first voltage is smaller than the second voltage. The embodiment of the application realizes real-time detection of the temperature of the display panel and outputs stable voltage according to the change of the temperature, so that when the temperature of the display panel is low, the voltage of the gate control circuit can be automatically increased, the increased voltage is stable, and a TFT switch in the display panel can be stably opened or closed, so that the display panel can stably display in a low-temperature environment. When the temperature of the display panel is higher, the voltage of the gate control circuit can be automatically reduced, and the reduced voltage is stable, so that the driving current of the panel is stabilized at a smaller current value, and the risk of liquid crystal polarization problem in the local part of the display panel is reduced. The temperature compensation circuit provided by the embodiment of the application can provide stable voltage under high and low temperature environments, so that the display effect of the display panel under various temperature environments is more stable, and the image quality is less influenced by temperature change.
In some alternative implementations of the present embodiment, the temperature detection module 101 is configured to convert the current temperature into an induced voltage representing the temperature magnitude, and output the induced voltage as a temperature signal to the voltage selection module 102.
Specifically, the temperature detection module 101 may be of various types, i.e. may output different induced voltages based on different physical characteristics of the object at different temperatures. For example, a thermistor capacitor, or the like may be used, and the change in resistance or capacitance may be converted into a change in voltage by using the characteristic that the resistance or capacitance is different at different temperatures, thereby outputting an induced voltage.
According to the embodiment, the temperature detection module is set to output the induced voltage to represent the temperature, so that the connected voltage selection module can judge the temperature change by comparing the voltage, and the design and manufacturing difficulty of the voltage selection module can be reduced.
In some alternative implementations of the present embodiment, as shown in fig. 3, the temperature detection module 101 includes a current source 1011, a thermistor Rtc, and a matching resistor R', which form a temperature-sensing resistor network 1012.
The current output end of the current source 1011 is connected with the resistance network 1012, and the current is input to the resistance network 1012, and the resistance network 1012 is used for generating induced voltage under the action of the current.
Wherein, the current source 1011 can output a fixed current (e.g. 20 μa), and the current is input into the resistor network 1012, and a corresponding voltage can be generated on the resistor network 1012. Since the resistance of the thermistor changes with temperature, the voltage across the resistor network 1012 also changes with temperature.
The resistor network 1012 may be connected in various ways, for example, one or more resistors may be connected in series or parallel with a thermistor to adjust the voltage range.
Alternatively, the thermistor may be a positive temperature coefficient thermistor or a negative temperature coefficient thermistor, that is, the resistance of the thermistor may increase with an increase in temperature or may decrease with an increase in temperature.
According to the embodiment, the temperature detection module is constructed by using the thermistor and the current source, so that the output voltage can accurately reflect the current temperature, the accuracy of representing the temperature by the generated induced voltage is improved, and the accuracy of temperature compensation of the voltage is improved.
In some alternative implementations of this embodiment, as shown in fig. 4, the matching resistor includes a parallel resistor R1 and a voltage dividing resistor R2, the parallel resistor is connected in parallel with the thermistor Rtc, and one end of the voltage dividing resistor is grounded, and the other end is connected with the thermistor and the parallel resistor.
According to the embodiment, the series resistor and the parallel resistor are arranged, so that the range of the induced voltage can be adjusted, namely, the resistance values of the series resistor and the parallel resistor are determined, the resistance value range of the resistor network can be determined, and then the range of the induced voltage is determined, and the induced voltage and the input voltage of the voltage selection module are better in matching performance, and the accuracy of temperature compensation of the voltage is improved.
In some alternative implementations of the present embodiment, as shown in fig. 5, the voltage selection module 102 includes a first switch K1, a second switch K2, a first pull-up resistor R3, a second pull-up resistor R4, a first pull-down resistor R5, and a second pull-down resistor R6. The first switch and the second switch may be constructed by a transistor, a field effect transistor, or other elements having switching characteristics.
In this embodiment, the control terminal of the first switch K1 is connected to the first external voltage input terminal, i.e. inputs the first external voltage V1 provided externally. The input end of the first switch K1 is connected with the second external voltage input end through a first pull-up resistor R3, namely the first pull-up resistor R3 is connected with the second external voltage V2. The output end of the first switch K1 is connected to the ground end through the first pull-down resistor R5, and is connected to the output end of the temperature detection module 101, that is, the receiving diagram shows the induced voltage VT output by the temperature detection module 101.
The first external voltage V1 represents a preset temperature, i.e., vt=v1 at the preset temperature.
In this embodiment, the control terminal of the second switch K2 is connected to the output terminal of the temperature detection module 101, that is, the induced voltage VT output by the temperature detection module 101 is shown in the receiving diagram. The input end of the second switch K2 is connected with a second external voltage input end through a second pull-up resistor R4, namely the second pull-up resistor R4 is connected with a second external voltage V2. The output end of the second switch K2 is connected to the ground end through the second pull-down resistor R6, and is connected to the first external voltage input end, i.e. the first external voltage V1 provided from the outside is accessed.
In this embodiment, the input terminal of the second switch K2 is connected to the voltage output terminal of the voltage selection module 102. As shown in fig. 5, uo is the voltage output terminal of the voltage selection module 102.
The voltage difference between the control terminal and the voltage output terminal of the first switch K1 may control the on or off of the input terminal and the output terminal of the first switch K1. For example, when the thermistor is a positive temperature coefficient thermistor, the higher the temperature, the higher the VT.
When VT is greater than V1, the current temperature is greater than the preset temperature, the first switch K1 is turned off, the second switch K2 is turned on, and the output voltage is uo=v2—i×r4, which is the first voltage output by the voltage selection module 102. Wherein I is the current flowing through R4.
When VT is smaller than V1, the current temperature is smaller than the preset temperature, the first switch K1 is turned on, the second switch K2 is turned off, and the output voltage is uo=v2, which is the second voltage output by the voltage selection module 102.
When VT is equal to V1, the current temperature is equal to the preset temperature, both the first switch K1 and the second switch K2 are turned off, and the output voltage is uo=v2.
The embodiment realizes that the temperature signal is responded by a simple discrete element by arranging the two switching elements, the pull-up resistor and the pull-down resistor, and outputs lower first voltage when the temperature is higher and higher second voltage when the temperature is lower.
In some alternative implementations of the present embodiment, as shown in fig. 6, the first switch K1 includes a first transistor Q1 and a first current limiting resistor R8, and the second switch K2 includes a second transistor Q2 and a second current limiting resistor R7.
The base of the first triode Q1 is connected with one end of a first current limiting resistor R8, and the other end of the first current limiting resistor R8 is a control end of a first switch K1. As shown in fig. 6, one end of R8 is connected to the base of Q1, and the other end is connected to V1, i.e. the end connected to V1 is the control end of the first switch K1.
The base of the second triode Q2 is connected with one end of a second current limiting resistor R7, and the other end of the second current limiting resistor R7 is the control end of a second switch K2. As shown in fig. 6, one end of R7 is connected to the base of Q2, and the other end is connected to VT, i.e. the end connected to VT is the control end of the second switch K2.
The collectors of Q1 and Q2 in fig. 6 are input ends of the first switch K1 and the second switch K2, and the emitters are output ends of the first switch K1 and the second switch K2, respectively.
The circuit shown in fig. 6 can be matched with a positive temperature coefficient thermistor, i.e. when the positive temperature coefficient thermistor is adopted, the Q1 and the Q2 select NPN type triodes. The specific working principle is as follows:
when VT is greater than V1, the current temperature is greater than the preset temperature, Q1 is turned off, Q2 is turned on, and the output voltage is uo=v2-ic×r4, which is the first voltage output by the voltage selection module 102. Where Ic is the collector current flowing through R4.
When VT is less than V1, the current temperature is less than the preset temperature, Q1 is turned on, Q2 is turned off, and the output voltage is uo=v2, which is the second voltage output by the voltage selection module 102.
When VT is equal to V1, the current temperature is equal to the preset temperature, both Q1 and Q2 are turned off, and the output voltage is uo=v2.
Alternatively, a negative temperature coefficient thermistor can be used, and at this time, the Q1 and Q2 select PNP type triodes, and the connection mode is kept unchanged. The specific working principle is as follows:
when VT is smaller than V1, the current temperature is greater than the preset temperature, Q1 is turned off, Q2 is turned on, and the output voltage is uo=v2-ic×r4, which is the first voltage output by the voltage selection module 102. Where Ic is the collector current flowing through R4.
When VT is greater than V1, the current temperature is less than the preset temperature, Q1 is turned on, Q2 is turned off, and the output voltage is uo=v2, which is the second voltage output by the voltage selection module 102.
When VT is equal to V1, the current temperature is equal to the preset temperature, both Q1 and Q2 are turned off, and the output voltage is uo=v2.
According to the embodiment, the first switch and the second switch are built through the triode, the circuit is simple in structure, low in cost, strong in universality and high in design and manufacturing efficiency, and a complex power chip is not needed.
In some alternative implementations of the present embodiment, as shown in fig. 7, the first switch K1 includes a first fet M1, and the second switch K2 includes a second fet M2.
The grid electrode of the first field effect transistor is the control end of the first switch K1. The grid electrode of the second field effect transistor is the control end of the second switch K2.
As shown in fig. 7, the drains of M1 and M2 are the input ends of the first switch K1 and the second switch K2, and the sources are the output ends of the first switch K1 and the second switch K2, respectively.
The circuit shown in fig. 7 can be matched with a positive temperature coefficient thermistor, namely, when the positive temperature coefficient thermistor is adopted, the N-channel field effect transistors are selected by M1 and M2. When the negative temperature coefficient thermistor is adopted, the M1 and the M2 select the P-channel type field effect transistor. The specific principle is similar to that described in the above embodiment using a triode, and will not be repeated here.
According to the embodiment, the first switch and the second switch are constructed by using the field effect transistor, so that the scheme for realizing the voltage selection module is further enriched, the cost is low, a complex power chip is not needed, the universality is higher, and the design and manufacturing efficiency is higher.
In some alternative implementations of the present embodiment, as shown in fig. 8, the voltage selection module 102 includes a first external voltage input, a second external voltage input, a temperature signal input, and a voltage output.
The first external voltage input terminal is used for inputting a first external voltage V1, the second external voltage input terminal is used for inputting a second external voltage V2, the temperature signal input terminal is used for inputting an induced voltage VT output by the temperature detection module 101, and the voltage output terminal is used for outputting a voltage Uo.
As shown in fig. 8, the voltage selection module 102 includes a comparator OP1, a third switch K3, a third pull-up resistor R9, and a third pull-down resistor R10.
The first input end of the comparator OP1 is connected with the output end of the temperature detection module, the second input end of the comparator is connected with the first external voltage input end, and the output end of the comparator is connected with the control end of the third switch through the third current limiting resistor.
As shown in fig. 8, the first input terminal of the comparator OP1 is a non-inverting input terminal connected to the receiving VT, and the second input terminal is an inverting input terminal connected to the receiving VT, and receives V1 as a reference voltage. R11 is a third current limiting resistor, and is respectively connected with the output end of the comparator OP1 and the control end of the third switch K3.
The input end of the third switch K3 is connected with the second external voltage input end through a third pull-up resistor R9, the output end of the third switch K3 is connected with the grounding end through a third pull-down resistor R10, and the input end of the third switch K3 is connected with the voltage output end of the voltage selection module 102.
The third switch K3 may be implemented using a transistor, a field effect transistor, or the like having a switching characteristic. For example, the third switch may be implemented as an NPN transistor, whose base may be connected to the output terminal of OP1 via a current limiting resistor, whose collector is connected to R9, and whose emitter is connected to R10 as the voltage output terminal Uo. The principle of the implementation mode is as follows:
When VT is greater than V1, the current temperature is greater than the preset temperature, OP1 outputs a high level, K3 is turned on, and the output voltage is uo=v2-ic×r9, which is the first voltage output by the voltage selection module 102. Where Ic is the collector current flowing through R9.
When VT is smaller than V1, the current temperature is smaller than the preset temperature, OP1 outputs a low level, K3 is turned off, and the output voltage is uo=v2, which is the second voltage output by the voltage selection module 102.
For another example, an N-channel field effect transistor may be employed as the third switch, the gate thereof being connected as the control terminal to the output terminal of OP1, the drain thereof being connected to R9, and the source thereof being connected to R10 as the voltage output terminal Uo. The principle of this implementation is similar to the above principle, and will not be described here again.
The embodiment provides a richer construction mode of the voltage selection module by adopting the comparator and the switch unit to construct the voltage selection module, the mode has lower cost, simpler implementation mode and fewer required elements, and the circuit design and implementation efficiency can be improved.
Fig. 9 is a schematic structural diagram of a display panel 900 according to an embodiment of the present application, and as shown in fig. 9, the display panel specifically includes a panel main body 901 and a panel circuit board 902, wherein the panel circuit board 902 is connected with the panel main body 901;
the panel circuit board 902 is disposed at an edge of the panel main body 901, and the temperature compensation circuit 100 described in the above embodiments is disposed on the panel circuit board 902, and a voltage output terminal of a voltage selection module included in the temperature compensation circuit 100 is connected to a power input terminal of a scan driving circuit on the panel main body 901.
The panel circuit board 902 may be a circuit board on a lateral edge (i.e., XB board) or a circuit board on a longitudinal edge of the panel body 901. The voltage output by the temperature compensation circuit can be provided for the scanning driving circuit, so that the driving voltage of the scanning driving circuit can be higher in a low-temperature environment.
In general, the panel circuit board 902 is connected to a control board via a wire (for example, a flexible flat cable FFC), and the control board inputs data, a timing signal, and the like necessary for display to the panel circuit.
According to the display panel provided by the embodiment of the application, the temperature compensation circuit is arranged on the panel circuit board on the edge of the panel main body by applying the temperature compensation circuit, so that the temperature of the panel main body can be acquired in real time, and the driving voltage is provided for the scanning driving circuit according to the temperature, so that the driving voltage of the scanning driving circuit can be increased in a low-temperature environment, and the display picture of the display panel is more stable.
Fig. 10 is a schematic structural diagram of a display device 1000 according to an embodiment of the present application, where, as shown in fig. 10, the display device includes:
a display panel 900, a panel frame 1001, a power module 1002, and a data receiving module 1003;
The display panel 900 may be the display panel 900 shown in fig. 8. The display panel 900 is mounted on the panel frame 1001.
The power supply end of the display panel 900 is connected to the power module 1002, and the signal receiving end of the display panel 900 is connected to the data receiving module 1003.
The power module 1002 may provide power required for the display panel 900 during operation, the data receiving module 1003 may receive input data, and the display panel 900 drives the corresponding pixels to display the corresponding colors according to the received data.
In addition, the display device may include a memory for storing data and programs, etc., a processor for running an application program, a data transmission bus, various types of data interfaces (e.g., network interface, user interface), etc., in addition to the portions shown in fig. 9.
According to the display device provided by the embodiment of the application, the display panel comprising the temperature compensation circuit can be used for increasing the driving voltage of the scanning driving circuit in a low-temperature environment, so that the display effect of the display device is more stable.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative elements and steps are described above generally in terms of function in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Those skilled in the art may implement the described functionality using different circuitry for each particular application, but such implementation is not to be considered as beyond the scope of the present application.
The steps of a circuit or algorithm described in connection with the embodiments disclosed herein may be embodied in hardware, in a software module executed by a processor, or in a combination of the two. The software modules may be disposed in Random Access Memory (RAM), memory, read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless an order of performance is explicitly stated. It should also be appreciated that additional or alternative steps may be used.
The foregoing is only a specific embodiment of the application to enable those skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
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| KR20050073836A (en) * | 2004-01-12 | 2005-07-18 | 삼성에스디아이 주식회사 | Compensation circuit for nonlinear temperature, and liquid crystal display using the same |
| CN106226934A (en) * | 2016-09-06 | 2016-12-14 | 合肥京东方光电科技有限公司 | A kind of testing circuit, display base plate, display floater, display device |
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|---|---|---|---|---|
| JPH08146390A (en) * | 1994-11-18 | 1996-06-07 | Fujitsu Ltd | Temperature compensation circuit |
| JP3688588B2 (en) * | 2000-09-22 | 2005-08-31 | シャープ株式会社 | Liquid crystal display device |
| KR101197050B1 (en) * | 2005-07-26 | 2012-11-06 | 삼성디스플레이 주식회사 | Driving apparatus for display device and display device including the same |
| JP2008058397A (en) * | 2006-08-29 | 2008-03-13 | Optrex Corp | Driving device for display device |
| KR20110096424A (en) * | 2010-02-22 | 2011-08-30 | 엘지디스플레이 주식회사 | Temperature compensation circuit and liquid crystal display device having same |
| CN110767195B (en) * | 2019-11-20 | 2022-07-01 | 京东方科技集团股份有限公司 | Display device and driving method thereof |
| CN117198241B (en) * | 2023-09-08 | 2024-08-02 | 惠科股份有限公司 | Driving voltage compensation circuit and display panel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20050073836A (en) * | 2004-01-12 | 2005-07-18 | 삼성에스디아이 주식회사 | Compensation circuit for nonlinear temperature, and liquid crystal display using the same |
| CN106226934A (en) * | 2016-09-06 | 2016-12-14 | 合肥京东方光电科技有限公司 | A kind of testing circuit, display base plate, display floater, display device |
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