CN115083367B - Driving voltage compensation device, display terminal and driving voltage compensation method - Google Patents
Driving voltage compensation device, display terminal and driving voltage compensation method Download PDFInfo
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- 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
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
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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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Abstract
The application relates to a driving voltage compensation device, a display terminal and a driving voltage compensation method, wherein the device comprises the following components: the current detection module is used for detecting the first driving current and the second driving current; the shunt module is used for forming a first detection voltage and a second detection voltage; the amplifying module is used for amplifying the first detection voltage and the second detection voltage respectively to obtain a third detection voltage and a fourth detection voltage; the analog-to-digital conversion module is used for combining the third detection voltage and the fourth detection voltage to obtain a fifth detection voltage and obtaining a sixth detection voltage after analog-to-digital conversion; the lookup table generation module is used for generating a lookup table according to the sixth detection voltage and the first and second driving voltages so as to compensate the first and second driving voltages. According to the method and the device, the driving current and the driving voltage corresponding to each pixel unit can be dynamically adjusted, and the risks of poor charging of the pixel units and afterimage occurrence of a display picture are reduced.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a driving voltage compensation device, a display terminal, and a driving voltage compensation method.
Background
In the related art, a liquid crystal display panel (Liquid Crystal Display, LCD) includes a plurality of pixel units, each of which has a thin film transistor (i.e., TFT) disposed therein corresponding to the pixel unit. In a liquid crystal display panel, the TFTs are generally controlled to be turned on and off according to a received scanning signal. Under the condition that the TFT switch is normal, each pixel unit can be charged to a target potential, so that normal display of a display picture is realized.
However, the relevant parameters of the TFT are not constant throughout the display. For example, for TFTs, there are a number of key parameters: the on-current Ion and the off-current Ioff represent leakage currents flowing through the drain terminal of the TFT in the on-state and the off-state, respectively. In addition, there are two key parameters: the on-voltage VGH and the off-voltage VGL represent voltages at the gate terminal of the TFT in the on-state and the off-state, respectively, and these two voltage parameters are strongly related to the on-current Ion and the off-current Ioff.
In practical applications, the on voltage corresponds to the maximum value of the on current and the off voltage corresponds to the minimum value of the off current theoretically. However, with the increase of the working time or the influence of external factors such as illumination, the I-V curve of the TFT may drift, that IS, the on current corresponding to the on voltage and the off current corresponding to the off voltage may drift, which results in smaller on current corresponding to the on voltage or larger off current corresponding to the off voltage, while too small on current may cause poor charging of the corresponding pixel unit, and too large off current may cause phenomena such as afterimage (IS).
Disclosure of Invention
In view of this, the application provides a driving voltage compensation device, a display terminal and a driving voltage compensation method, which can improve the accuracy of compensating for the first driving current and the second driving current according to the driving current and the driving voltage corresponding to each pixel unit, and optimize the matching effect of the driving current and the corresponding driving voltage, thereby reducing the risk of poor charging of the pixel unit and afterimage occurrence of the display picture.
According to an aspect of the present application, there is provided a driving voltage compensation device applied to a display panel including a plurality of pixel units arranged in an array, the driving voltage compensation device including: the current detection module is used for detecting the current first driving current and the current second driving current of the corresponding pixel units; the shunt module is electrically connected with the current detection module and is used for respectively connecting the first driving current and the second driving current and forming a first detection voltage corresponding to the first driving current and a second detection voltage corresponding to the second driving current; the amplifying module is electrically connected with the shunt module and is used for amplifying the first detection voltage and the second detection voltage respectively to obtain a third detection voltage corresponding to the first driving current and a fourth detection voltage corresponding to the second driving current; the analog-to-digital conversion module is electrically connected with the amplifying module and is used for combining the third detection voltage and the fourth detection voltage to obtain a combined fifth detection voltage, and performing analog-to-digital conversion on the fifth detection voltage to obtain an analog-to-digital converted sixth detection voltage; the lookup table generating module is configured to generate a lookup table according to the sixth detection voltage and the current first driving voltage and second driving voltage of the corresponding pixel unit, so as to compensate the first driving voltage and the second driving voltage.
Further, each of the pixel units includes a thin film transistor, each of the thin film transistors includes a first port, a second port, and a third port, wherein: the first driving current and the second driving current respectively comprise currents flowing through a third port of the thin film transistor, and the first driving voltage and the second driving voltage respectively comprise voltages loaded on the first port of the thin film transistor.
Further, the driving mode of the display panel includes positive polarity driving and negative polarity driving, wherein: the first driving voltage and the first driving current correspond to the positive polarity driving mode, and the second driving voltage and the second driving current correspond to the negative polarity driving mode.
Further, the driving voltage compensation device further comprises a power conversion module, the power conversion module is electrically connected with the current detection module, the power conversion module comprises a first power port and a second power port, the first power port is used for outputting the first driving current, and the second power port is used for outputting the second driving current.
Further, the shunt module includes a first shunt resistor and a second shunt resistor, wherein: one end of the first shunt resistor is electrically connected with the first power port, and the other end of the first shunt resistor is electrically connected with the amplifying module; one end of the second shunt resistor is electrically connected with the second power port, and the other end of the second shunt resistor is electrically connected with the amplifying module.
Further, the amplifying module includes a first amplifier and a second amplifier, wherein: the positive input end of the first amplifier is electrically connected with one end of the first shunt resistor, and the negative input end of the first amplifier is electrically connected with the other end of the first shunt resistor; the positive input end of the second amplifier is electrically connected with one end of the second shunt resistor, and the negative input end of the second amplifier is electrically connected with the other end of the second shunt resistor; the output end of the first amplifier and the output end of the second amplifier are electrically connected with the analog-digital conversion module together.
Further, the lookup table generation module further includes: and the aging module is electrically connected with the analog-to-digital conversion module and is used for setting different aging times for the display panel and generating the lookup table according to the sixth detection voltage corresponding to the different aging times.
Further, the driving voltage compensation device further includes: the voltage compensation module is electrically connected with the lookup table generation module and is used for comparing the current driving current with the target driving current in the lookup table to obtain a comparison result, and adjusting the driving voltage corresponding to the driving current according to the comparison result so as to compensate the driving current.
According to another aspect of the present application, there is provided a display terminal including a display panel and the driving voltage compensation device connected to the display panel.
According to still another aspect of the present application, there is provided a driving voltage compensation method applied to the driving voltage compensation device, the driving voltage compensation method including: detecting a current first driving current and a current second driving current of a corresponding pixel unit; respectively connecting the first driving current and the second driving current, and forming a first detection voltage corresponding to the first driving current and a second detection voltage corresponding to the second driving current; amplifying the first detection voltage and the second detection voltage respectively to obtain a third detection voltage corresponding to the first driving current and a fourth detection voltage corresponding to the second driving current; combining the third detection voltage and the fourth detection voltage to obtain a combined fifth detection voltage, and performing analog-to-digital conversion on the fifth detection voltage to obtain an analog-to-digital converted sixth detection voltage; and generating a lookup table according to the sixth detection voltage and the current first driving voltage and second driving voltage of the corresponding pixel unit so as to compensate the first driving voltage and the second driving voltage.
The first driving current and the second driving current corresponding to different charging paths are detected, the first detecting voltage and the second detecting voltage are formed, the sixth detecting voltage is generated after amplification, combination and analog-to-digital conversion, and then a lookup table is generated according to the sixth detecting voltage and the current first driving voltage and second driving voltage of the corresponding pixel units, so that the first driving voltage and the second driving voltage are compensated based on the lookup table.
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Technical solutions and other advantageous effects of the present application will be made apparent from the following detailed description of specific embodiments of the present application with reference to the accompanying drawings.
Fig. 1 shows a block diagram of a driving voltage compensation device of an embodiment of the present application.
Fig. 2 shows a schematic structural diagram of a driving voltage compensation device according to an embodiment of the present application.
Fig. 3 shows a flowchart of a driving voltage compensation method according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," etc. indicate or are based on the orientation or positional relationship shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements or interaction relationship between the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
The following disclosure provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. Furthermore, the present application may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not in themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize the application of other processes and/or the use of other materials. In some instances, methods, means, elements, and circuits have not been described in detail as not to unnecessarily obscure the present application.
The application mainly provides a driving voltage compensation device, driving voltage compensation device is applied to display panel, display panel includes the pixel unit that a plurality of arrays set up, driving voltage compensation device includes: the current detection module is used for detecting the current first driving current and the current second driving current of the corresponding pixel units; the shunt module is electrically connected with the current detection module and is used for respectively connecting the first driving current and the second driving current and forming a first detection voltage corresponding to the first driving current and a second detection voltage corresponding to the second driving current; the amplifying module is electrically connected with the shunt module and is used for amplifying the first detection voltage and the second detection voltage respectively to obtain a third detection voltage corresponding to the first driving current and a fourth detection voltage corresponding to the second driving current; the analog-to-digital conversion module is electrically connected with the amplifying module and is used for combining the third detection voltage and the fourth detection voltage to obtain a combined fifth detection voltage, and performing analog-to-digital conversion on the fifth detection voltage to obtain an analog-to-digital converted sixth detection voltage; the lookup table generating module is configured to generate a lookup table according to the sixth detection voltage and the current first driving voltage and second driving voltage of the corresponding pixel unit, so as to compensate the first driving voltage and the second driving voltage.
The first driving current and the second driving current corresponding to different charging paths are detected, then the first detecting voltage and the second detecting voltage are formed, the sixth detecting voltage is generated after amplification, combination and analog-to-digital conversion, and then a lookup table is generated according to the sixth detecting voltage and the current first driving voltage and second driving voltage of the corresponding pixel units, so that the first driving voltage and the second driving voltage are compensated based on the lookup table.
Fig. 1 shows a block diagram of a driving voltage compensation device of an embodiment of the present application.
As shown in fig. 1, the driving voltage compensation device of the embodiment of the present application may include a current detection module 11, a shunt module 12, an amplifying module 13, an analog-to-digital conversion module 14, and a lookup table generating module 15. The current detection module 11, the shunt module 12, the amplifying module 13, the analog-to-digital conversion module 14, and the lookup table generating module 15 may be electrically connected in sequence. For example, to maintain communication between the modules, the modules may be electrically connected using communication protocols such as IIC and SPI.
It should be noted that, the driving voltage compensation device in the embodiment of the present application may be disposed in the driving circuit of the display panel, or may be disposed outside the driving circuit of the display panel, and electrically connected to the display panel as a separate unit or module. It is understood that the present application is not limited to the specific location of the drive voltage compensation device.
In this application, the display panel may be a liquid crystal display panel. For other types of display panels, such as OLED display panels, it is possible to provide thin film transistors inside, and the present application is based on the inventive concept of the I-V characteristics of the thin film transistors themselves. Therefore, the driving voltage compensation device may be applied to other types of display panels such as OLED based on the inventive concept of the present application, which is not limited to the type of display panel.
In one example, the display panel is a liquid crystal display panel. The liquid crystal display panel comprises a plurality of pixel units arranged in an array. Each pixel unit comprises a thin film transistor, and each thin film transistor comprises a first port, a second port and a third port, wherein: the first driving current and the second driving current respectively comprise currents flowing through a third port of the thin film transistor, and the first driving voltage and the second driving voltage respectively comprise voltages loaded on the first port of the thin film transistor.
Taking the thin film transistor as an N-type example, the first port may be a gate of the thin film transistor, the second port may be a source of the thin film transistor, and the third port may be a drain of the thin film transistor. The first port can receive a scanning signal on a corresponding scanning line, and the scanning signal can control all thin film transistors in a row of pixel units to be turned on; the third port can receive data signals on the corresponding data lines, and the data signals can control data loaded by the corresponding pixel units so that the corresponding pixel units display different gray scales. The second port may be electrically connected to a pixel electrode to charge a pixel capacitance in the pixel unit when the thin film transistor is turned on. Of course, the thin film transistor may be P-type, which is not limited in this application.
Fig. 2 shows a schematic structural diagram of a driving voltage compensation device according to an embodiment of the present application.
As shown in fig. 2, the display panel 21 may be electrically connected to the driving board 22, and the driving board 22 may be electrically connected to the driving voltage compensation device 20. The drive voltage compensation device 20 may also be provided on the drive plate 22. The drive voltage compensation device 20 may also be implemented using the same chip, for example. The driving board 22 may be provided with driving devices such as a source driver to generate scan signals and data signals required for each pixel unit in the display panel. Hereinafter, a specific structure and operation mechanism of the driving voltage compensation device will be described with reference to fig. 2.
Specifically, the driving voltage compensation device further comprises a power conversion module, the power conversion module is electrically connected with the current detection module, the power conversion module comprises a first power port and a second power port, the first power port is used for outputting the first driving current, and the second power port is used for outputting the second driving current.
Illustratively, the power conversion module may include a direct current power conversion chip (i.e., DDIC). The dc power conversion chip may be provided with a first power port AVDD and a second power port HVAA. The driving current corresponding to each data line can be extracted from the first power supply port AVDD and the second power supply port HVAA.
Further, the driving mode of the display panel includes positive polarity driving and negative polarity driving, wherein: the first driving voltage and the first driving current correspond to the positive polarity driving mode, and the second driving voltage and the second driving current correspond to the negative polarity driving mode.
The first power port AVDD may be driven with positive polarity, and the second power port HVAA may be driven with negative polarity. That is, the pixel unit of the present application may have two charging paths corresponding to the positive polarity driving and the negative polarity driving, respectively. Therefore, when the driving current of the corresponding pixel unit is detected, the first driving current corresponding to the positive polarity driving and the second driving current corresponding to the negative polarity driving can be detected respectively.
Further, the shunt module includes a first shunt resistor and a second shunt resistor, wherein: one end of the first shunt resistor is electrically connected with the first power port, and the other end of the first shunt resistor is electrically connected with the amplifying module; one end of the second shunt resistor is electrically connected with the second power port, and the other end of the second shunt resistor is electrically connected with the amplifying module.
Referring to fig. 2, the first shunt resistor R1 may be electrically connected at one end to the first power supply port AVDD in the driving board 22 and at the other end to the amplifier U2; the second shunt resistor R2 may be electrically connected at one end to the second power supply port HVAA in the drive board 22, and at the other end to the amplifier U3. It should be noted that, the output of the first power port may include a first driving current, and the output of the second power port may include a second driving current, so that the first shunt resistor and the second shunt resistor are provided, so that the driving currents corresponding to different polarities can be respectively connected, and small voltage differences are respectively formed at two ends of the first shunt resistor and two ends of the second shunt resistor, so as to facilitate further processing of the back-end amplifying circuit.
It should be noted that, because the differential pressure at two ends of the first shunt resistor R1 and the differential pressure of the second shunt resistor R2 are weak, in order not to affect the normal operation of the later-stage circuit, the first shunt resistor R1 and the second shunt resistor R2 need to use precise resistors with sufficiently small resistance values, so as to improve the accuracy of measurement.
Further, the amplifying module includes a first amplifier and a second amplifier, wherein: the positive input end of the first amplifier is electrically connected with one end of the first shunt resistor, and the negative input end of the first amplifier is electrically connected with the other end of the first shunt resistor; the positive input end of the second amplifier is electrically connected with one end of the second shunt resistor, and the negative input end of the second amplifier is electrically connected with the other end of the second shunt resistor; the output end of the first amplifier and the output end of the second amplifier are electrically connected with the analog-digital conversion module together.
As shown in fig. 2, the positive input terminal of the first amplifier U2 may be electrically connected to one end of the first shunt resistor R1, the negative input terminal of the first amplifier U2 may be electrically connected to the other end of the first shunt resistor R1, and the negative input terminal of the first amplifier U2 may be grounded (i.e., GND 1). The positive input end of the second amplifier U3 may be electrically connected to one end of the second shunt resistor R2, the negative input end of the second amplifier U3 may be electrically connected to the other end of the second shunt resistor R2, and the negative input end of the second amplifier U3 may also be grounded. The power supply positive terminals of the first amplifier U2 and the second amplifier U3 may share the power supply VDD, and the power supply negative terminals of the first amplifier U2 and the second amplifier U3 may share the ground (i.e., GND 2). The output x1 of the first amplifier U2 and the output x2 of the second amplifier U3 may be sent to an analog conversion (i.e., a/D) module U1 for processing. Of course, the output x1 of the first amplifier U2 and the output x2 of the second amplifier U3 may be combined before being sent to the analog conversion module U1, and then the combined values may be sent to the analog conversion module U1 for analog conversion.
With continued reference to fig. 2, the third detection voltage may be x1 and the fourth detection voltage may be x2. The fifth detection voltage may be obtained by combining the third detection voltage and the fourth detection voltage. In one example, the third detection voltage and the fourth detection voltage may be directly added to each other to obtain the fifth detection voltage. It is to be understood that the present application is not limited to the manner in which it is incorporated.
After the fifth detection voltage is subjected to analog-to-digital conversion, a sixth detection voltage, for example, in binary form, can be obtained. The sixth detection voltage may form the lookup table together with the current first driving voltage and the second driving voltage of the corresponding pixel unit.
Further, the lookup table generation module further includes: and the aging module is electrically connected with the analog-to-digital conversion module and is used for setting different aging times for the display panel and generating the lookup table according to the sixth detection voltage corresponding to the different aging times.
For example, the same display panel may be subjected to burn-in testing. For example, the aging time is set to 100 hours, 200 hours, 300 hours, and the like. The degree of I-V characteristic drift of the thin film transistor is different at different aging times. Therefore, the lookup table can be generated according to the sixth detection voltage corresponding to different aging times. Of course, in order to further refine the lookup table, it is also possible to measure a plurality of display panels, and then average the measurement results, thereby improving the accuracy of measurement.
The lookup table may include a first driving current and an optimal first driving voltage adapted to the first driving current, and a second driving current and an optimal second driving voltage adapted to the second driving current. Of course, in the present application, the lookup table may also include a first driving voltage and an optimal first driving current adapted to the first driving voltage, a second driving voltage and an optimal second driving current adapted to the second driving voltage. That is, the present application can find the corresponding optimal driving voltage by the driving current, or can find the corresponding optimal driving current reversely by the driving voltage.
The look-up table may be stored in a memory location in the drive board, for example. The driving voltage compensation device can continuously detect in real time and output binary data output by the analog-to-digital conversion unit to a time sequence controller (namely TCON). After the time sequence controller identifies the binary data, the memory unit can be inquired through communication modes such as IIC/SPI and the like, so that a first driving voltage and a second driving voltage corresponding to the binary data are obtained. Finally, the time sequence controller can control the power management chip (namely PMIC) to carry out voltage regulation through communication modes such as IIC and the like.
Further, the driving voltage compensation device further includes: the voltage compensation module is electrically connected with the lookup table generation module and is used for comparing the current driving current with the target driving current in the lookup table to obtain a comparison result, and adjusting the driving voltage corresponding to the driving current according to the comparison result so as to compensate the driving current.
For example, based on the formed lookup table, in the case that the first driving current is smaller or larger, the best first driving voltage corresponding to the first driving current can be searched through the lookup table, and then the current first driving voltage is adjusted according to the searched best first driving voltage, so that the first driving voltage is matched with the first driving current. For the second driving current, a similar compensation process to that of the first driving current is possible, and will not be described again.
Further, there is provided a display terminal including a display panel and the driving voltage compensation device connected to the display panel. For example, the display panel of the embodiments of the present application may be used in wearable devices, such as smart bracelets, smart watches, VR (Virtual Reality) devices, mobile phones, electronic books and electronic newspaper televisions, personal computers, foldable and rollable OLED devices, and other flexible OLED display and lighting fields. It is understood that the application is not limited to the specific application scenario of the display panel.
Fig. 3 shows a flowchart of a driving voltage compensation method according to an embodiment of the present application.
As shown in fig. 3, the present application further provides a driving voltage compensation method, which is applied to the driving voltage compensation device, and the driving voltage compensation method includes:
step S1: detecting a current first driving current and a current second driving current of a corresponding pixel unit;
step S2: respectively connecting the first driving current and the second driving current, and forming a first detection voltage corresponding to the first driving current and a second detection voltage corresponding to the second driving current;
step S3: amplifying the first detection voltage and the second detection voltage respectively to obtain a third detection voltage corresponding to the first driving current and a fourth detection voltage corresponding to the second driving current;
step S4: combining the third detection voltage and the fourth detection voltage to obtain a combined fifth detection voltage, and performing analog-to-digital conversion on the fifth detection voltage to obtain an analog-to-digital converted sixth detection voltage;
step S5: and generating a lookup table according to the sixth detection voltage and the current first driving voltage and second driving voltage of the corresponding pixel unit so as to compensate the first driving voltage and the second driving voltage.
It should be noted that the above steps are exemplary. In practical application, the adopted steps can be adjusted according to the needs so as to realize the driving of the display panel. For details of the driving voltage compensation method, reference may be made to the driving voltage compensation device, and details thereof will not be repeated.
In summary, in the embodiment of the present application, the first driving current and the second driving current corresponding to different charging paths are detected, then the first detection voltage and the second detection voltage are formed, the sixth detection voltage is generated after amplification, combination and analog-to-digital conversion, and then the lookup table is generated according to the sixth detection voltage and the current first driving voltage and second driving voltage of the corresponding pixel unit, so that the first driving voltage and the second driving voltage are compensated based on the lookup table, the accuracy of compensating the first driving current and the second driving current can be improved according to dynamic adjustment of the driving current and the driving voltage of each pixel unit, the matching effect of the driving current and the corresponding driving voltage is optimized, and the risk of defective charging of the pixel unit and afterimage occurrence of the display picture is reduced.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
The driving voltage compensation device, the display terminal and the driving voltage compensation method provided by the embodiment of the application are described in detail, and specific examples are applied to explain the principle and implementation of the application, and the description of the above embodiments is only used for helping to understand the technical scheme and core idea of the application; those of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. A driving voltage compensation device, wherein the driving voltage compensation device is applied to a display panel, the display panel includes a plurality of pixel units arranged in an array, the driving voltage compensation device includes:
the current detection module is used for detecting the current first driving current and the current second driving current of the corresponding pixel units;
the shunt module is electrically connected with the current detection module and is used for respectively connecting the first driving current and the second driving current and forming a first detection voltage corresponding to the first driving current and a second detection voltage corresponding to the second driving current;
the amplifying module is electrically connected with the shunt module and is used for amplifying the first detection voltage and the second detection voltage respectively to obtain a third detection voltage corresponding to the first driving current and a fourth detection voltage corresponding to the second driving current;
the analog-to-digital conversion module is electrically connected with the amplifying module and is used for combining the third detection voltage and the fourth detection voltage to obtain a combined fifth detection voltage, and performing analog-to-digital conversion on the fifth detection voltage to obtain an analog-to-digital converted sixth detection voltage;
the lookup table generating module is configured to generate a lookup table according to the sixth detection voltage and the current first driving voltage and second driving voltage of the corresponding pixel unit, so as to compensate the first driving voltage and the second driving voltage.
2. The driving voltage compensation device according to claim 1, wherein each of the pixel units includes a thin film transistor, each of the thin film transistors includes a first port, a second port, and a third port, wherein: the first driving current and the second driving current respectively comprise currents flowing through a third port of the thin film transistor, and the first driving voltage and the second driving voltage respectively comprise voltages loaded on the first port of the thin film transistor.
3. The driving voltage compensation device according to claim 2, wherein the driving mode of the display panel includes a positive polarity driving and a negative polarity driving, wherein: the first driving voltage and the first driving current correspond to the positive polarity driving mode, and the second driving voltage and the second driving current correspond to the negative polarity driving mode.
4. The driving voltage compensation device according to claim 2, further comprising a power conversion module electrically connected to the current detection module, the power conversion module comprising a first power port for outputting the first driving current and a second power port for outputting the second driving current.
5. The drive voltage compensation device of claim 4 wherein the shunt module comprises a first shunt resistor and a second shunt resistor, wherein: one end of the first shunt resistor is electrically connected with the first power port, and the other end of the first shunt resistor is electrically connected with the amplifying module; one end of the second shunt resistor is electrically connected with the second power port, and the other end of the second shunt resistor is electrically connected with the amplifying module.
6. The drive voltage compensation device of claim 5 wherein the amplification module comprises a first amplifier and a second amplifier, wherein: the positive input end of the first amplifier is electrically connected with one end of the first shunt resistor, and the negative input end of the first amplifier is electrically connected with the other end of the first shunt resistor; the positive input end of the second amplifier is electrically connected with one end of the second shunt resistor, and the negative input end of the second amplifier is electrically connected with the other end of the second shunt resistor; the output end of the first amplifier and the output end of the second amplifier are electrically connected with the analog-digital conversion module together.
7. The drive voltage compensation device of claim 1 wherein the look-up table generation module further comprises: and the aging module is electrically connected with the analog-to-digital conversion module and is used for setting different aging times for the display panel and generating the lookup table according to the sixth detection voltage corresponding to the different aging times.
8. The drive voltage compensation device of claim 1, further comprising: the voltage compensation module is electrically connected with the lookup table generation module and is used for comparing the current driving current with the target driving current in the lookup table to obtain a comparison result, and adjusting the driving voltage corresponding to the driving current according to the comparison result so as to compensate the driving current.
9. A display terminal comprising a display panel and a driving voltage compensation device according to any one of claims 1 to 8, the driving voltage compensation device being connected to the display panel.
10. A driving voltage compensation method, characterized in that the driving voltage compensation method is applied to the driving voltage compensation device according to any one of claims 1 to 8, the driving voltage compensation method comprising:
detecting a current first driving current and a current second driving current of a corresponding pixel unit;
respectively connecting the first driving current and the second driving current, and forming a first detection voltage corresponding to the first driving current and a second detection voltage corresponding to the second driving current;
amplifying the first detection voltage and the second detection voltage respectively to obtain a third detection voltage corresponding to the first driving current and a fourth detection voltage corresponding to the second driving current;
combining the third detection voltage and the fourth detection voltage to obtain a combined fifth detection voltage, and performing analog-to-digital conversion on the fifth detection voltage to obtain an analog-to-digital converted sixth detection voltage;
and generating a lookup table according to the sixth detection voltage and the current first driving voltage and second driving voltage of the corresponding pixel unit so as to compensate the first driving voltage and the second driving voltage.
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