CN115171618B - Overdrive adjusting unit and method, display panel and display device - Google Patents
Overdrive adjusting unit and method, display panel and display device Download PDFInfo
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- CN115171618B CN115171618B CN202210830685.7A CN202210830685A CN115171618B CN 115171618 B CN115171618 B CN 115171618B CN 202210830685 A CN202210830685 A CN 202210830685A CN 115171618 B CN115171618 B CN 115171618B
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- 239000004973 liquid crystal related substance Substances 0.000 description 6
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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
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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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Abstract
The application discloses an overdrive adjusting unit and method, a display panel and a display device, wherein the overdrive adjusting unit comprises: a sensing circuit including a temperature sensor configured to sense a temperature of a display panel by the temperature sensor, and output a feedback voltage based on the temperature; and an adjusting circuit configured to select one of at least two overdrive tables based on the received feedback voltage to adjust an overdrive value of a data signal of the display panel. According to the embodiment of the application, the sensing circuit is arranged to sense the temperature of the display panel to output the feedback voltage, and the adjusting circuit is used for selecting the corresponding overdrive table based on the feedback voltage to be used for adjusting the overdrive voltage value of the data signal, so that the display panel can always keep stable response time at different temperatures.
Description
Technical Field
The present application relates to the field of display technologies, and in particular, to an overdrive adjusting unit and method, a display panel, and a display device.
Background
At present, display panels are being developed toward large-size, high-resolution. In contrast, the panel load increases, and the driving capability is limited, resulting in a short charging time for large-sized, high-resolution panels relative to small-sized panels, which places higher demands on response time. In the driving process of the liquid crystal display panel, because the response speed of the liquid crystal is limited, the response time becomes an important parameter of the liquid crystal display, and the slow response time can generate a smear phenomenon, so that the image quality is poor, and the film watching experience is affected.
At present, an overdrive (line over driver) technology is widely adopted for reducing response time, and the overdrive technology stores an overdrive table in which overdrive values corresponding to driving voltages of data signals at different gray scales are recorded, so that the display panel is higher than the corresponding voltage of a target state at the beginning by using the overdrive values. However, the temperature of the display panel is changed during operation, and under different temperatures, there is a difference from the expected response time, and once the overdrive value is set too large, overcharge will occur, and the phenomenon of white or black display will occur, which affects the normal display of the picture.
Disclosure of Invention
In order to solve at least one of the above problems, a first aspect of the present application provides an overdrive adjusting unit comprising:
a sensing circuit including a temperature sensor configured to sense a temperature of the display panel by the temperature sensor, and output a feedback voltage based on the temperature;
and an adjusting circuit configured to select one of the at least two overdrive tables based on the received feedback voltage to adjust an overdrive value of the data signal of the display panel.
In some alternative embodiments, the number of overdrive tables is 2 N The number of the two-dimensional space-saving type,
the sensing circuit comprises an N-1 stage voltage dividing circuit and a 2 stage voltage dividing circuit N-1 The number of sensing sub-circuits is one,
wherein the nth voltage dividing circuit comprises 2n-1 voltage dividing modules, each voltage dividing module comprises an input end and two output ends, the output end of each voltage dividing module of the nth voltage dividing circuit is respectively connected to the input ends of the two voltage dividing modules of the n+1th voltage dividing circuit,
when N is more than or equal to 2, the input end of each sensing sub-circuit is electrically connected with one output end of the voltage dividing module in the N-1 level voltage dividing circuit, the output end is used as one output end of the sensing circuit to output feedback voltage, when N is 1, the input end of the sensing sub-circuit is connected to the first power supply signal end,
the input end of the 1 st stage voltage dividing circuit is electrically connected to the first power signal end, and N, n is a positive integer greater than or equal to 1.
In some alternative embodiments, the voltage dividing module includes: the first voltage dividing resistor, the second voltage dividing resistor, the first transistor and the second transistor comprise a first end, a second end and a control end, wherein,
the first end of the first voltage dividing resistor is an input end of the voltage dividing module, the second end of the first voltage dividing resistor is electrically connected to the first end of the second voltage dividing resistor and is electrically connected to the control ends of the first transistor and the second transistor, the second end of the second voltage dividing resistor is electrically connected to the second power supply signal end, the first end of the first transistor and the second end of the second transistor are electrically connected to the first power supply signal end, the second end of the first transistor is used as a first output end, the first end of the second transistor is used as a second output end,
the sensing sub-circuit includes a first resistor and a second resistor,
when N is more than or equal to 2, the first end of the first resistor is electrically connected to one output end of one voltage dividing module in the N-1 level voltage dividing circuit, the second end of the first resistor is electrically connected with the first end of the third resistor and is used as one output end of the sensing circuit, the second end of the second resistor is electrically connected to the second power supply signal end,
when N is equal to 1, the first end of the first resistor is electrically connected to the first power signal end, the second end of the first resistor is electrically connected with the first end of the second resistor and serves as the output end of the sensing circuit, the second end of the second resistor is electrically connected to the second power signal end,
the second voltage-dividing resistor and the second resistor are both temperature sensors, and the temperature sensors are resistance type temperature sensors.
In some alternative embodiments, the conditioning circuit includes 2 N-1 A regulator sub-circuit comprising a third transistor and a fourth transistor, wherein,
the control end of the third transistor is electrically connected with the control end of the fourth transistor and is connected with the feedback voltage output by the sensing circuit, the first end of the third transistor is electrically connected with the second end of the fourth transistor and is connected with the first power supply signal end, the second end of the third transistor serving as one output end of the regulating circuit is electrically connected with the enabling control end corresponding to one overdrive meter, and the first end of the fourth transistor serving as the other output end of the regulating circuit is electrically connected with the enabling control end corresponding to the other overdrive meter.
In some alternative embodiments, the overdrive adjustment unit further comprises a memory unit, the memory unit storing an overdrive table,
the adjusting circuit selects an overdrive table in the storage unit based on the received feedback voltage to adjust an overdrive value of the data signal of the display panel.
In some alternative embodiments, the signal level of the first power signal terminal is high, the signal level of the second power signal terminal is low, the first transistor is a P-type transistor, the second transistor is an N-type transistor, the first terminal of each transistor is a source, and the second terminal is a drain.
In some alternative embodiments, the signal level of the first power signal terminal is high, the signal level of the second power signal terminal is low, the third transistor is a P-type transistor, the third transistor is an N-type transistor, the first terminal of each transistor is a source, and the second terminal is a drain.
A second aspect of the present application provides a display panel comprising a display area and a non-display area, the non-display area comprising the overdrive adjustment unit as described above.
A third aspect of the application provides a display device comprising a display panel as described above.
A fourth aspect of the present application provides an overdrive adjusting method for the overdrive adjusting unit described above, characterized by comprising:
sensing a temperature of the display panel by a temperature sensor of the sensing circuit, and outputting a feedback voltage based on the temperature;
the adjusting circuit selects one of the at least two overdrive tables based on the received feedback voltage to adjust an overdrive value of the data signal of the display panel.
The beneficial effects of the application are as follows:
the application aims at the existing problems at present, and establishes an overdrive adjusting unit and method, a display panel and a display device, wherein the sensing circuit and the overdrive adjusting circuit are provided, the sensing circuit comprises a temperature sensor, the temperature of the display panel sensed by the temperature sensor is used for outputting feedback voltage, and the adjusting circuit is used for selecting one of at least two overdrive tables based on the feedback voltage so as to adjust overdrive voltage values of data signals of the display panel, so that different overdrive tables can be obtained corresponding to different temperatures, the display panel can always obtain corresponding overdrive voltage values under different temperature conditions, stable response time can be kept all the time under different temperatures, the phenomenon of white dragging or black dragging is avoided, the stability of display image quality is ensured, and the overdrive adjusting unit has wide application prospect.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 shows a schematic block diagram of an overdrive adjustment unit according to an embodiment of the application;
FIG. 2 is a schematic diagram showing specific connection relationships of circuits in an overdrive adjusting unit according to an embodiment of the present application;
FIG. 3 shows a schematic circuit diagram of an overdrive adjustment unit according to an embodiment of the application;
fig. 4 shows a schematic circuit diagram of an overdrive adjustment unit according to another embodiment of the application;
fig. 5 shows a specific application example of the overdrive adjusting unit according to an embodiment of the present application;
fig. 6 shows a schematic diagram of an overdrive adjustment method using an overdrive adjustment unit according to an embodiment of the present application.
Detailed Description
In order to more clearly illustrate the present application, the present application will be further described with reference to preferred embodiments and the accompanying drawings. Like parts in the drawings are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and that this application is not limited to the details given herein.
It is to be noted that unless otherwise defined, technical or scientific terms used in the present disclosure should be taken in a general sense as understood by one of ordinary skill in the art to which the present disclosure pertains. The terms "first," "second," and the like, as used in this disclosure, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Likewise, the terms "a," "an," or "the" and similar terms do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items.
In the related art, in order to accelerate the response speed of liquid crystal in a liquid crystal display and thereby reduce the response time, the liquid crystal is generally driven by an overdrive method. Specifically, the overdrive method needs to calculate and measure the optimal overdrive voltage value corresponding to all the gray-scale brightness in advance, and when the display panel performs display driving, each pixel in the display area of the display panel is driven to light by reading the gray-scale brightness of each frame of image and aiming at the drive voltage value corresponding to the gray-scale brightness. The optimal driving voltage value has a one-to-one correspondence with the gray-scale value presented by the previous frame and the gray-scale value presented by the existing frame, and thus the overdrive scheme requires an overdrive table (i.e., OD) that represents such one-to-one correspondence. When each frame is displayed, the display panel reads the overdrive table, and drives each pixel in the display panel to display according to the overdrive voltage value corresponding to the gray scale brightness of the current frame according to the corresponding relation indicated in the overdrive table.
In the current overdrive method, an overdrive table is stored in advance, so that only one version of gray-scale value correspondence can be read in the overdrive table. In the use process of the display panel, various devices in the driving circuit generate heat, when the temperature of the display panel is different, the corresponding relation in the overdrive table is not accurate any more, so that the overdrive voltage value obtained after the overdrive table is read is not accurate any more, and once the pixel is overcharged, the display panel is subjected to the phenomenon of white or black dragging, and the normal display of a picture is seriously influenced.
Based on the above problems, referring to fig. 1, an embodiment of the present application provides an overdrive adjusting unit, including:
a sensing circuit 10 including a temperature sensor configured to sense a temperature of the display panel by the temperature sensor, and output a feedback voltage based on the temperature;
and an adjusting circuit 20 configured to select one of the at least two overdrive tables based on the received feedback voltage to adjust an overdrive value of the data signal of the display panel.
In this embodiment, by providing the sensing circuit and the overdrive adjusting circuit, and setting the sensing circuit to include the temperature sensor, the feedback voltage is output based on the temperature of the display panel sensed by the temperature sensor, and one of the at least two overdrive tables is selected by the adjusting circuit based on the feedback voltage, so as to adjust the overdrive voltage value of the data signal of the display panel, so that different overdrive tables can be obtained corresponding to different temperatures, so that the display panel always obtains corresponding overdrive voltage values under different temperature conditions, thereby always keeping stable response time under different temperatures, avoiding the phenomenon of white or black dragging, and ensuring the stability of the display image quality.
Specifically, referring to FIG. 2, the sensing circuit 10 in the overdrive conditioning unit includes N-1 stage voltage dividing circuits 11-1, 11-2, …, 11- (N-1) and 2 N-1 The individual sensing sub-circuits 12-1, 12-2, …, 12-2 N-1 At this time, the number of selected overdrive tables (OD) that can be supported is 2 N And N is a positive integer greater than or equal to 1.
In the embodiment of the present application, the number of the overdrive tables to be selected is two, that is, the embodiment in which the voltage dividing circuit is not present is supported. Since no reference numerals can be indicated in the block diagram representing the cascade without the voltage dividing circuit, the voltage dividing circuit starts from 11-1, but it will be understood by those skilled in the art that it does not represent the minimum number of divided voltages as 1 stage. Note that, when it is not necessary to distinguish between the number of stages of the voltage dividing circuit and the number of sensing sub-circuits, the voltage dividing circuit is collectively referred to as the voltage dividing circuit 11 and the sensing sub-circuit 12.
With continued reference to FIG. 2, the n-th stage voltage divider circuit 11-n in the sense circuit 10 includes 2 n-1 And the voltage dividing module is represented by a rectangular frame. The voltage dividing module comprises an input end and two output ends, the output end of each voltage dividing module of the nth voltage dividing circuit 11-n is respectively connected to the input ends of the two voltage dividing modules of the n+1th voltage dividing circuit, and n is a positive integer greater than or equal to 1.
When N is greater than or equal to 2, the input end of each sensing sub-circuit 12 is electrically connected to one output end of the voltage dividing module in the N-1 stage voltage dividing circuit 11- (N-1), and the output end is used as one output end of the sensing circuit 10 to output the feedback voltage.
In addition, when N is 1, the input end of the sensing sub-circuit is connected to the first power supply signal end; the input end of the 1 st stage voltage dividing circuit is electrically connected to the first power signal end.
With continued reference to FIG. 2, the conditioning circuit 20 includes 2 N-1 The regulator sub-circuits 20-1, 20-2, …, 20- (2) N-1 ) Is configured to select a particular overdrive table based on the feedback voltages output by the respective outputs of the sensing circuit.
With the above arrangement, in order to realize selection of a plurality of overdrive tables, signal branching is performed by using the voltage dividing circuit in the sensing circuit 10, and then each circuit is judged by using the sensing sub-circuit to obtain feedback voltage; and then, the adjusting circuit 20 is utilized to select based on the feedback voltage output by each output end of the sensing circuit 10, and the overdrive table corresponding to the specific temperature sensed by the sensing circuit 10 is selected, so that the overdrive tables of different versions can be correspondingly adjusted based on different temperatures, and the display panel obtains the corresponding technical effect of overdrive voltage value.
In order to further understand the specific circuit structure and function of the overdrive adjusting unit according to the embodiment of the present application, the following is described in detail with reference to the circuit diagrams of the specific embodiments of fig. 3 and 4.
In a specific example, referring to fig. 3, a schematic circuit diagram of an overdrive adjustment unit is shown when the selectable overdrive table is two, OD1 and OD 2.
It will be appreciated by those skilled in the art that when the overdrive table is two, corresponding to N being 1, the sensing circuit 10 will include a 0-stage voltage divider circuit, that is, the overdrive adjustment unit will not require the voltage divider circuit 11.
Specifically, referring to fig. 3, the sensing circuit 10 in the overdrive adjusting unit includes only 1 sensing sub-circuit 12. The sensing sub-circuit 12 includes a first resistor R and a second resistor R T That is, the sensing circuit 10 is composed of a first resistor R and a second resistor R T The composition is formed.
Wherein a first end of the first resistor R is electrically connected to the first power signal end DVDD as an input end of the sensing circuit 10, and a second end and the second resistor R T Is electrically connected to and serves as an output of the sensing circuit 10. A second resistor R except for an input end and an output end T Is electrically connected to the second power signal terminal GND as a low level signal terminal. Wherein the second resistor R T Is a temperature sensor. In particular, in this example, the temperature sensor is a resistive temperature sensor.
Further specifically, with continued reference to FIG. 3, the conditioning circuit 20 includes 1 conditioning sub-circuit. The regulator sub-circuit includes a third transistor M3 and a fourth transistor M4.
The control terminal of the third transistor M3 is electrically connected to the control terminal of the fourth transistor M4 and is connected to the feedback voltage VT output by the sensing circuit 10, the first terminal of the third transistor M3 is electrically connected to the second terminal of the fourth transistor M4 and is connected to the first power signal terminal DVDD, the second terminal of the third transistor M3 is electrically connected to the enable control terminal EN1 corresponding to one overdrive table OD1 as one output terminal of the adjusting circuit 20, and the first terminal of the fourth transistor M4 is electrically connected to the enable control terminal EN2 corresponding to the other overdrive table OD2 as the other output terminal of the adjusting circuit 20.
In this example, the overdrive table for 2 temperature zones may be set, and the corresponding overdrive table may be selected by the temperature sensor detecting that the temperature of the display panel is a specific zone of the 2 temperature zones.
In this embodiment, since the voltage of the first power signal terminal DVDD is high, the voltage of the second power signal terminal DVDD is low, the third transistor M3 is set to be a P-type transistor, the fourth transistor M4 is set to be an N-type transistor, the first terminal of each transistor is a source, and the second terminal is a drain.
Specifically, with a second resistance R T For the PTC resistive temperature sensor as an example, a section of less than 30 ℃ is set as T1, a section of 30 ℃ or more is set as T2, and the first resistor R and the second resistor R are selected T So that the second resistance R is less than 30 DEG C T The resistance value of the resistor is far smaller than that of R, and when the temperature is more than or equal to 30℃, the second resistor R T The resistance of the first resistor R is far greater than that of R, for example, the resistance of the first resistor R is 10KΩ, and the resistance of the second resistor R is less than 30deg.C T The resistance value of (C) is 100 omega, and the second resistance R is more than or equal to 30 DEG C T The resistance of the first power signal terminal DVDD is 100kΩ, and the voltage of the first power signal terminal DVDD is 3.3V, for example.
When the second resistor R T When the temperature of the display panel is sensed to be less than 30 ℃, the second resistor R T The resistance value of the second resistor R is far smaller than that of the first resistor R T The voltage drop across the terminals is close to 0V, i.e. the feedback voltage V T The voltage value of (2) is approximately 0V. Because the third transistor M3 is a P-type transistor, the first end is a source electrode, the second end is a drain electrode, the second transistor M4 is an N-type transistor, the first end is a source electrode, and the second end is a drain electrode, so that the third transistor M3 is turned on and the fourth transistor M4 is turned off, the second end of the third transistor M3 is set to a high level, the enable control end EN1 corresponding to the overdrive table OD1 receives the high level, and thus the overdrive table OD1 is selected, and the display panel can be driven to display by an overdrive value corresponding to the overdrive table with a temperature lower than 30 ℃.
When the first isTwo resistors R T When the temperature of the display panel is greater than or equal to 30 ℃, the second resistor R T The resistance value of the second resistor R is far greater than that of the first resistor R T The voltage drop across the terminals is approximately 3.3V, i.e. the feedback voltage V T The voltage value of (2) is approximately 3.3V. Because the third transistor M3 is a P-type transistor, the first end is a source electrode, the second end is a drain electrode, the second transistor M4 is an N-type transistor, the first end is a source electrode, and the second end is a drain electrode, so that the third transistor M3 is turned off while the fourth transistor M4 is turned on, the first end of the fourth transistor M4 is set to a high level, the enable control end EN2 corresponding to the overdrive table OD2 receives the high level, and thus the overdrive table OD2 is selected, and the display panel can be driven to display by an overdrive value corresponding to the overdrive table with a temperature greater than or equal to 30 ℃.
Through the arrangement, the temperature of the display panel sensed by the temperature sensor in the sensing circuit is utilized, the temperature sensor is specifically used for displaying different resistance values based on different temperatures, the feedback voltage obtained after sensing is output, and then the overdrive table corresponding to the sensed temperature is selected by utilizing different selection results obtained in the adjusting unit based on different feedback voltages, so that the technical effect of obtaining overdrive tables of different versions based on different temperatures of the display panel is realized, the display panel can always obtain accurate overdrive values when the temperatures of the display panel are different, the stable response time of the display panel is kept at different temperatures, and the display effect is improved.
In another specific example, referring to fig. 4, a schematic circuit diagram of an overdrive adjustment unit is shown when the selectable overdrive table is four, namely OD1, OD2, OD3 and OD 4.
It will be appreciated by those skilled in the art that when the overdrive table is two, corresponding to N being 2, the sensing circuit 10 will include a 1-stage voltage divider circuit 11 and 2 sensing sub-circuits 12, wherein the voltage divider circuit 11 is made up of 1 voltage divider module because there is only a 1-stage voltage divider circuit.
Specifically, referring to fig. 4, the voltage dividing module constituting the voltage dividing circuit 11 includes a first voltage dividing resistor R1, a second voltage dividing resistor R1Voltage dividing resistor R T1 A first transistor M1 and a second transistor M2. The first transistor M1 and the second transistor M2 include a first end, a second end and a control end, the first end of the first voltage dividing resistor R1 is an input end of the voltage dividing module, and the second end is electrically connected to the second voltage dividing resistor R T1 And is electrically connected to the control terminals of the first transistor M1 and the second transistor M2, the second voltage-dividing resistor R T1 The first terminal of the first transistor M1 and the second terminal of the second transistor M2 are electrically connected to the first power signal terminal DVDD, the second terminal of the first transistor M1 is a first output terminal, and the first terminal of the second transistor M2 is a second output terminal. Since the voltage dividing circuit 11 includes only a 1-stage voltage dividing module, an input terminal of the voltage dividing module is connected to the first power signal terminal DVDD.
Each sensing sub-circuit 12 includes a first resistor and a second resistor. Because N is 2, the sensing circuit 10 includes 2 sensing sub-circuits, the first sensing sub-circuit 12-1 is composed of a first resistor R11 and a second resistor R T2 The second sensing sub-circuit 12-2 is composed of a first resistor R12 and a second resistor R T3 。
The first end of the first resistor R11 in the first sensing sub-circuit 12-1 is electrically connected to an output end of the voltage dividing module in the N-1 stage voltage dividing circuit, that is, an output end of the voltage dividing module in the sensing circuit. In this example, the output terminal is the second terminal of the first transistor M1. In addition, the second end of the first resistor R11 and the second resistor R T2 Is electrically connected to and outputs a feedback voltage V as an output of the sensing circuit 10 T1 . A second resistor R except for an input end and an output end T2 Is electrically connected to the second power signal terminal GND as a low level signal terminal.
Meanwhile, the first end of the first resistor R12 in the second sensing sub-circuit 12-2 is electrically connected to one output end of the voltage dividing module in the N-1 stage voltage dividing circuit, that is, one output end of the voltage dividing module in the sensing circuit. In this example, the output terminal is a first terminal of the first transistor M2. In addition, the second end of the first resistor R12 and the second resistor R T3 Is electrically connected to and outputs a feedback voltage V as another output terminal of the sensing circuit 10 T2 . A second resistor R except for an input end and an output end T3 Is electrically connected to the second power signal terminal GND as a low level signal terminal.
Importantly, a second voltage dividing resistor R T1 Second resistor R in first sensing sub-circuit 12-1 T2 And a second resistor R in a second sensing sub-circuit 12-2 T3 Are temperature sensors, and in particular to this example, the temperature sensors are resistive temperature sensors.
Further specifically, with continued reference to FIG. 4, the conditioning circuit 20 includes 2 conditioning sub-circuits. The regulator sub-circuit includes a third transistor and a fourth transistor, and the first regulator sub-circuit 20-1 includes a third transistor M3 1 And a fourth transistor M4 1 The second regulator sub-circuit 20-2 includes a third transistor M3 2 And a fourth transistor M4 2 。
Wherein the third transistor M3 in the first regulator sub-circuit 20-1 1 Control terminal of (c) and fourth transistor M4 1 Is electrically connected with and connected with the feedback voltage V output by the sensing circuit 10 T1 A first end of the third transistor M31 and a fourth transistor M4 1 A third transistor M3 electrically connected to the second terminal of the first power signal terminal DVDD 1 A fourth transistor M4 electrically connected as an output terminal of the regulating circuit 20 to an enable control terminal EN1 corresponding to the overdrive table OD1 1 The other output terminal of the regulator circuit 20 is electrically connected to the enable control terminal EN2 corresponding to the other overdrive table OD 2.
At the same time, the third transistor M3 in the second regulator sub-circuit 20-2 2 Control terminal of (c) and fourth transistor M4 2 Is electrically connected with and connected with the feedback voltage V output by the sensing circuit 10 T2 Third transistor M3 2 And a fourth transistor M4 2 A third transistor M3 electrically connected to the second terminal of the first power signal terminal DVDD 2 As an output of the regulating circuit 20, an enable control terminal E corresponding to an overdrive table OD3N3 is electrically connected to the fourth transistor M4 2 The other output terminal of the regulator circuit 20 is electrically connected to the enable control terminal EN4 corresponding to the other overdrive table OD 4.
In this example, overdrive tables for 4 temperature zones may be set, and the corresponding overdrive table may be selected by the temperature sensor detecting that the temperature of the display panel is a specific zone of the 4 temperature zones.
In this embodiment, since the voltage of the first power signal terminal DVDD is high, the voltage of the second power signal terminal DVDD is low, the first transistor M1 is set to be a P-type transistor, the second transistor M2 is set to be an N-type transistor, the first terminal of each transistor is a source, and the second terminal is a drain; third transistor M3 1 And M3 2 A fourth transistor M4 as a P-type transistor 1 And M4 2 The first end of each transistor is a source electrode, and the second end is a drain electrode.
Specifically, with a second resistance R T1 Second resistor R in first sensing sub-circuit 12-1 T2 And a second resistor R in a second sensing sub-circuit 12-2 T3 For example, the PTC resistive temperature sensor is set to have a section of less than 20 ℃ as T1, a section of 20 ℃ or more and less than 40 ℃ as T2, a section of 40 ℃ or more and less than 60 ℃ as T3, and a section of 60 ℃ or more as T4.
By selecting a first voltage dividing resistor R1 and a second voltage dividing resistor R T1 First resistors R11 and R12, second resistor R T2 And R is T3 So that when the temperature is less than 20 ℃, the second voltage-dividing resistor R T1 The resistance value of (2) is far smaller than that of the first voltage dividing resistor R1, and the second resistor R T2 The resistance value of the first resistor R11 is far smaller than that of the second resistor R; when the temperature is more than or equal to 20 ℃ and less than 40 ℃, the second voltage dividing resistor R T1 The resistance value of (2) is far smaller than that of the first voltage dividing resistor R1, and the second resistor R T2 The resistance value of the resistor is far larger than that of the first resistor R11; when the temperature is more than or equal to 40 ℃ and less than 60 ℃, the second voltage dividing resistor R T1 The resistance value of (2) is far greater than that of the first voltage dividing resistor R1, and the second resistor R T3 The resistance value of the first resistor R12 is far smaller than that of the second resistor R; when greater than or equal to 60At a temperature of C, a second voltage-dividing resistor R T1 The resistance value of (2) is far greater than that of the first voltage dividing resistor R1, and the second resistor R T3 Is much larger than the resistance of the first resistor R12.
For example, in order to satisfy the above condition, the resistance value of the first resistor R12 may be set to be far greater than the resistance value of the first voltage dividing resistor R1, the resistance value of the first voltage dividing resistor R1 is far greater than the resistance value of the first resistor R11, r12=1mΩ>>R1＝10KΩ>>r11=100deg.OMEGA, while the second voltage dividing resistor R T1 A second resistor R T2 And a second resistor R T3 The PTC resistive temperature sensor is identical, i.e. the same resistance value and the same change trend are the same. When the temperature is less than 20 ℃, R T1 ＝R T2 ＝R T3 =10Ω; r is at 20 ℃ or higher and 40 ℃ or lower T1 ＝R T2 ＝R T3 =1kΩ; r is at 40 ℃ or higher and 60 ℃ or lower T1 ＝R T2 ＝R T3 =100 kΩ; r is at least 60 DEG C T1 ＝R T2 ＝R T3 =10mΩ. The voltage value of the first power supply signal terminal DVDD is set to be 3.3V, for example.
A second voltage dividing resistor R in the sensing circuit 10 T1 A second resistor R T2 And a second resistor R T3 When the temperature of the display panel is sensed to be less than 20 ℃, because R T1 ＝R T2 ＝10Ω<<R11＝100Ω<<R1, at this time, the second voltage dividing resistor R T1 The voltage drop at two ends is close to 0V, the first transistor M1 is conducted to shunt signals for the first time, and the first end of the first resistor R11 is connected to the voltage value of the first power supply signal end DVDD by 3.3V; at the same time, a second resistor RT2<<R11, at this time, the second resistance R T2 A third transistor M3 with a voltage drop of approximately 0V 1 Turned on to thereby form a third transistor M3 1 The second terminal of (1) is set to a high level, and the enable control terminal EN1 corresponding to the overdrive table OD1 receives the high level, so that the overdrive table OD1 is selected, and therefore the display panel can be driven to display at the overdrive value corresponding to the overdrive table with the temperature less than 20 ℃.
A second voltage dividing resistor R in the sensing circuit 10 T1 A second resistor R T2 And a second step ofResistor R T3 When the temperature of the display panel is sensed to be 20 ℃ or more and 40 ℃ or less, because r1=10kΩ>>R T1 ＝R T2 ＝1KΩ>>r11=100deg.OMEGA, at this time, the second voltage dividing resistor R T1 The voltage drop at two ends is close to 0V, the first transistor M1 is conducted to shunt signals for the first time, and the first end of the first resistor R11 is connected to the voltage value of the first power supply signal end DVDD by 3.3V; at the same time a second resistance R T2 <<R11, at this time, the second resistance R T2 The voltage drop across the fourth transistor M4 is approximately 3.3V 1 Turn on, thereby fourth transistor M4 1 The second terminal of the overdrive table OD2 is set to the high level, and the enable control terminal EN2 corresponding to the overdrive table OD2 receives the high level, so that the overdrive table OD2 is selected, and therefore, the display panel can be driven to display at the overdrive value corresponding to the overdrive table with the temperature of 20 ℃ or higher and 40 ℃ or lower.
A second voltage dividing resistor R in the sensing circuit 10 T1 A second resistor R T2 And a second resistor R T3 When the temperature of the display panel is sensed to be 40 ℃ or more and less than 60 ℃, because r1=10kΩ<<R T1 ＝R T3 ＝100KΩ<<R12=1mΩ, at which time the second voltage dividing resistor R T1 The voltage drop at two ends is close to 3.3V, the second transistor M2 is conducted to shunt the signal for the first time, and the first end of the first resistor R12 is connected to the voltage value of 3.3V of the first power supply signal end DVDD; at the same time a second resistance R T3 <<R12, at this time, the second resistance R T3 A third transistor M3 with a voltage drop of approximately 0V 2 Turned on to thereby form a third transistor M3 2 The second terminal of the overdrive table OD3 is set to a high level, and the enable control terminal EN3 corresponding to the overdrive table OD3 receives the high level, so that the overdrive table OD3 is selected, and therefore, the display panel can be driven to display at an overdrive value corresponding to the overdrive table with a temperature of 40 ℃ or higher and less than 60 ℃.
A second voltage dividing resistor R in the sensing circuit 10 T1 A second resistor R T2 And a second resistor R T3 When the temperature of the display panel is sensed to be greater than 60 c, since r1=10kΩ<<R12＝1MΩ<<R T1 ＝R T3 =10mΩ, at this time, the second voltage dividing resistor R T1 The voltage drop at two ends is close to 3.3V, the second transistor M2 is conducted to shunt the signal for the first time, and the first end of the first resistor R12 is connected to the voltage value of 3.3V of the first power supply signal end DVDD; at the same time a second resistance R T3 >>R12, at this time, the second resistance R T3 The voltage drop across the fourth transistor M4 is approximately 3.3V 2 Turn on, thereby fourth transistor M4 2 The second terminal of the overdrive table OD4 is set to the high level, and the enable control terminal EN4 corresponding to the overdrive table OD4 receives the high level, so that the overdrive table OD4 is selected, and therefore the display panel can be driven to display at the overdrive value corresponding to the overdrive table with the temperature of 60 ℃ or higher.
Through the arrangement, the temperature of the display panel sensed by the temperature sensor in the sensing circuit is utilized, the temperature sensor is specifically used for displaying different resistance values based on different temperatures, the feedback voltage obtained after sensing is output, and then the overdrive table corresponding to the sensed temperature is selected by utilizing different selection results obtained in the adjusting unit based on different feedback voltages, so that the technical effect of obtaining overdrive tables of different versions based on different temperatures of the display panel is realized, the display panel can always obtain accurate overdrive values when the temperatures of the display panel are different, the stable response time of the display panel is kept at different temperatures, and the display effect is improved.
It should be noted that the above temperature intervals and the change trend of the temperature sensor are only exemplary and not intended to be limiting, and the specific application may be adjusted according to the similar design principle as required, and will not be described herein.
It should be further noted that, although the above description is given taking an example of supporting selection of 4 overdrive tables (i.e., N is equal to 2), those skilled in the art will understand that the structure and principle when N is greater than 2 are similar to those described above, and the difference is only that the more-stage voltage dividing circuit divides the detection result of the temperature sensor, and the different detection results are finally passed through the sensing sub-circuit to obtain the feedback voltage, and finally output to the adjusting circuit for final selection. When the number of overdrive tables increases, only the magnitude relation between the sensing value of the temperature sensor and the compared voltage dividing resistor needs to be reasonably selected, and the detailed description is omitted.
In further alternative embodiments, the overdrive adjustment unit further comprises a storage unit storing the overdrive table, the adjustment circuit selecting the overdrive table in the storage unit based on the received feedback voltage to adjust the overdrive value of the data signal of the display panel.
With this arrangement, a plurality of overdrive tables can be stored in advance by the storage unit, and the above enable control terminal will be able to connect to the storage unit, so that the corresponding past table is called up for display driving of the display panel based on the selection result of the enable control terminal, which will not be described here again.
Corresponding to the same inventive concept, a second aspect of the present application provides a display panel comprising:
a display area and a non-display area, the non-display area including the overdrive adjustment unit as described above.
In this embodiment, by setting the overdrive adjustment circuit in the non-display area of the display panel, and by providing the sensing circuit and the overdrive adjustment circuit, and the sensing circuit outputs the feedback voltage based on the temperature of the display panel sensed by the temperature sensor, and by selecting one of the at least two overdrive tables based on the feedback voltage by the adjustment circuit, so as to adjust the overdrive voltage value of the data signal of the display panel, different overdrive tables can be obtained corresponding to different temperatures, so that the display panel always obtains corresponding overdrive voltage values under different temperature conditions, thereby always maintaining stable response time under different temperatures, avoiding the phenomenon of white or black dragging, and ensuring the stability of the display image quality.
Referring to fig. 5, a block diagram of an application of specific relationships between circuits in a display panel is shown.
As shown in fig. 5, the display panel includes a display area 30 and respective drive-related circuits provided in a peripheral non-display area of the display area 30. The sensing circuit 10 may be disposed on an XPCBA circuit board in a non-display area, and the adjusting circuit 20 may be disposed on a TCON IC circuit board, and further includes a driving circuit 40 corresponding to each pixel point in the display area in the non-display area.
Referring to fig. 5, in practical application, the sensing circuit provided on the XPCBA circuit board senses the temperature of the display panel and outputs the feedback voltage V to the adjusting circuit 20 provided on the TCON IC circuit board based on the sensed temperature T The regulating circuit 20 is based on the feedback voltage V T One overdrive table of the at least two overdrive tables is selected, the overdrive voltage value corresponding to the overdrive table is read based on the overdrive table, and is transmitted to a driving circuit corresponding to each pixel point through an XPCBA circuit board by a protocol USIT, wherein the driving circuit can be each module of a driving chip in a COF, each module corresponds to each pixel in a display area 30 and is output to a pixel driving circuit of each corresponding pixel in a display panel by a transmission protocol Sout to drive the corresponding pixel to light.
Of course, it should be understood by those skilled in the art that the above application scenario is merely exemplary, those skilled in the art may set a specific setting area of the overdrive adjusting unit based on a specific circuit design that is not shown, and the above signal transmission protocol is also merely exemplary and not intended to be limiting, and other suitable transmission protocols may be selected according to the needs in practical application, which is not repeated herein.
Based on the same inventive concept, a third aspect of the present application also provides a display device including the display panel described in the above embodiments.
Since the display device provided in the embodiment of the present application includes a display panel corresponding to the display panel provided in the above-described several embodiments, the previous embodiment is also applicable to the present embodiment, and will not be described in detail in the present embodiment.
In this embodiment, the display device may be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a vehicle-mounted display, a digital photo frame or a navigator, and by loading the display panel, the display device can adjust the overdrive table corresponding to the display panel at any time based on the temperature of the display panel for driving during the display process of the display device, thereby improving the display effect and having a wide application prospect.
Based on the same inventive concept, a fourth aspect of the present application provides an overdrive adjusting method for the overdrive adjusting unit described in the above embodiments, as shown with reference to fig. 6, including:
s1, sensing the temperature of a display panel through a temperature sensor of a sensing circuit, and outputting feedback voltage based on the temperature;
s2, the adjusting circuit selects one of at least two overdrive tables based on the received feedback voltage so as to adjust the overvoltage driving value of the data signal of the display panel.
In this embodiment, the sensing circuit outputs the feedback voltage based on the temperature of the display panel sensed by the temperature sensor, and the adjusting circuit selects one of the at least two overdrive tables based on the feedback voltage to adjust the overdrive voltage value of the data signal of the display panel, so that different overdrive tables can be obtained corresponding to different temperatures, the phenomenon of white or black dragging is avoided, and the stability of the display image quality is ensured.
The application aims at the existing problems at present, and establishes an overdrive adjusting unit and method, a display panel and a display device, wherein the sensing circuit and the overdrive adjusting circuit are provided, the sensing circuit comprises a temperature sensor, the temperature of the display panel sensed by the temperature sensor is used for outputting feedback voltage, and the adjusting circuit is used for selecting one of at least two overdrive tables based on the feedback voltage so as to adjust overdrive voltage values of data signals of the display panel, so that different overdrive tables can be obtained corresponding to different temperatures, the display panel can always obtain corresponding overdrive voltage values under different temperature conditions, stable response time can be kept all the time under different temperatures, the phenomenon of white dragging or black dragging is avoided, the stability of display image quality is ensured, and the overdrive adjusting unit has wide application prospect.
It should be understood that the foregoing examples of the present application are provided merely for clearly illustrating the present application and are not intended to limit the embodiments of the present application, and that various other changes and modifications may be made therein by one skilled in the art without departing from the spirit and scope of the present application as defined by the appended claims.
Claims (9)
1. An overdrive adjustment unit, comprising:
a sensing circuit including a temperature sensor configured to sense a temperature of a display panel by the temperature sensor, and output a feedback voltage based on the temperature;
an adjusting circuit configured to select 2 based on the received feedback voltage N One of the overdrive tables to adjust an overdrive value of a data signal of the display panel;
the sensing circuit comprises an N-1 level voltage dividing circuit and a 2 level voltage dividing circuit N-1 The number of sensing sub-circuits is one,
wherein the nth stage voltage dividing circuit comprises 2n-1 voltage dividing modules, each voltage dividing module comprises an input end and two output ends, the output end of each voltage dividing module of the nth stage voltage dividing circuit is respectively connected to the input ends of the two voltage dividing modules of the n+1th stage voltage dividing circuit,
when N is more than or equal to 2, the input end of each sensing sub-circuit is electrically connected with one output end of the voltage dividing module in the N-1 level voltage dividing circuit, the output end is used as one output end of the sensing circuit to output the feedback voltage, when N is 1, the input end of the sensing sub-circuit is connected to the first power supply signal end,
the input end of the voltage dividing circuit of stage 1 is electrically connected to the first power signal end, and N, n is a positive integer greater than or equal to 1.
2. The overdrive adjustment unit according to claim 1, wherein the voltage dividing module comprises: the first transistor and the second transistor comprise a first end, a second end and a control end, wherein,
the first end of the first voltage dividing resistor is an input end of the voltage dividing module, the second end of the first voltage dividing resistor is electrically connected to the first end of the second voltage dividing resistor and is electrically connected to the control ends of the first transistor and the second transistor, the second end of the second voltage dividing resistor is electrically connected to a second power supply signal end, the first end of the first transistor and the second end of the second transistor are electrically connected to the first power supply signal end, the second end of the first transistor is used as a first output end, the first end of the second transistor is used as a second output end,
the sensing sub-circuit includes a first resistor and a second resistor,
when N is more than or equal to 2, the first end of the first resistor is electrically connected to one output end of one voltage division module in the N-1 level voltage division circuit, the second end of the first resistor is electrically connected with the first end of the second resistor and is used as one output end of the sensing circuit, the second end of the second resistor is electrically connected to the second power supply signal end,
when N is equal to 1, the first end of the first resistor is electrically connected to the first power supply signal end, the second end of the first resistor is electrically connected with the first end of the second resistor and serves as the output end of the sensing circuit, the second end of the second resistor is electrically connected to the second power supply signal end,
the second voltage-dividing resistor and the second resistor are both the temperature sensor, and the temperature sensor is a resistance type temperature sensor.
3. The overdrive adjustment unit of claim 2, wherein the adjustment circuit comprises 2 N-1 A regulator sub-circuit comprising a third transistor and a fourth transistor, wherein,
the control end of the third transistor is electrically connected with the control end of the fourth transistor and is connected with the feedback voltage output by the sensing circuit, the first end of the third transistor is electrically connected with the second end of the fourth transistor and is connected with the first power supply signal end, the second end of the third transistor serving as one output end of the regulating circuit is electrically connected with an enabling control end corresponding to one overdrive meter, and the first end of the fourth transistor serving as the other output end of the regulating circuit is electrically connected with an enabling control end corresponding to the other overdrive meter.
4. The overdrive adjustment unit according to claim 1, further comprising a storage unit that stores the overdrive table,
the adjusting circuit selects an overdrive table in the storage unit based on the received feedback voltage to adjust an overdrive value of a data signal of the display panel.
5. The overdrive adjustment unit according to claim 2, wherein the signal level of the first power signal terminal is high, the signal level of the second power signal terminal is low, the first transistor is a P-type transistor, the second transistor is an N-type transistor, the first terminal of each transistor is a source, and the second terminal is a drain.
6. The overdrive adjusting unit according to claim 3, wherein the signal level of the first power signal terminal is high, the signal level of the second power signal terminal is low, the third transistor is a P-type transistor, the fourth transistor is an N-type transistor, the first terminal of each transistor is a source, and the second terminal is a drain.
7. A display panel comprising a display area and a non-display area, the non-display area comprising the overdrive adjustment unit according to any of claims 1-6.
8. A display device comprising the display panel of claim 7.
9. An overdrive adjustment method for an overdrive adjustment unit according to any one of claims 1-6, comprising:
sensing a temperature of a display panel by a temperature sensor of the sensing circuit, and outputting a feedback voltage based on the temperature;
the adjusting circuit selects one of at least two overdrive tables based on the received feedback voltage to adjust an overdrive value of a data signal of the display panel.
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| CN102368381A (en) * | 2011-10-27 | 2012-03-07 | 深圳市华星光电技术有限公司 | Method for improving charging of liquid crystal panel and circuit thereof |
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| CN101266764A (en) * | 2007-03-16 | 2008-09-17 | 晨星半导体股份有限公司 | Temperature-dependent overdrive circuit for LCD panel and its method |
| CN105741811A (en) * | 2016-05-06 | 2016-07-06 | 京东方科技集团股份有限公司 | Temperature compensating circuit, display panel and temperature compensating method |
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