CN116844482A - Voltage control method, device, electronic equipment and storage medium - Google Patents
Voltage control method, device, electronic equipment and storage medium Download PDFInfo
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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
- G09G3/22—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 using controlled light sources
- G09G3/30—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 using controlled light sources using electroluminescent panels
- G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
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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
- G09G2310/0243—Details of the generation of driving signals
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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
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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Abstract
The present disclosure relates to a voltage control method applied to a display panel, including a plurality of rows of pixel units arranged along a target direction, the method including: determining the current working voltage of each pixel unit according to the display information of each pixel unit; determining a voltage variation amount of each pixel unit according to a first voltage input to the display panel and the current operating voltage; adjusting driving signals of the pixel units according to the voltage variation; the driving signals are used for controlling the display effect of each pixel unit. The voltage variation of the pixel units is determined according to the difference value of the power supply voltage and the current working voltage, so that the driving signal of each pixel unit can be accurately adjusted, the display effect of each pixel unit can be adjusted, the adjustment precision of adjusting the display effect of each display is improved, the accuracy of adjusting the display effect of the display panel is further improved, and the effect of the whole display panel is improved.
Description
Technical Field
The disclosure relates to the field of display technologies, and in particular, to a voltage control method, a device, an electronic device and a storage medium.
Background
With the development of technology, an Active Matrix Organic Light Emitting Diode (OLED) display device is known as the display device with the most development potential in the industry because of the advantages of light weight, bright color, high contrast, wide color gamut, self-luminescence, short response time, low operating voltage, and the like.
In order to meet the requirements of users, the size of the OLED display panel is larger and larger, the number of pixel units is larger and larger, the length of the panel wires is longer and longer, and the wire resistance is larger and larger, so that voltage Drop (IR Drop) is generated on the wires by a power voltage signal, and the voltage signal actually obtained by each pixel unit is different, and therefore when the pixel units are driven to display through data signals under the condition that the power voltage is the same, each pixel unit can display different display effects, such as different brightness, due to different voltage Drop (IR Drop), the display brightness of the OLED display panel is uneven, and the display effect of the OLED display panel is affected.
Disclosure of Invention
The disclosure provides a voltage control method, a voltage control device, electronic equipment and a storage medium.
In a first aspect of embodiments of the present disclosure, there is provided a voltage control method applied to a display panel including a plurality of rows of pixel units arranged along a target direction, the method including: determining the current working voltage of each pixel unit according to the display information of each pixel unit; determining the voltage variation of each pixel unit according to the first voltage input to the display panel and the current working voltage; adjusting driving signals of each pixel unit according to the voltage variation; wherein, the drive signal is used for controlling the display effect of each pixel unit.
In one embodiment, the display panel further includes: a first transmission line and a second transmission line; wherein the first transmission line is used for transmitting the first voltage to the second transmission line; the second transmission line is used for transmitting the first voltage after passing through the second transmission line to each row of pixel units; the determining the current working voltage of each pixel unit according to the display information of each pixel unit comprises the following steps: determining a first voltage drop of the first transmission line, a second voltage drop of the second transmission line and a third voltage drop of each row of pixel units according to display information of each pixel unit; and determining the current working voltage according to the first voltage, the first voltage drop, the second voltage drop and the third voltage drop.
In one embodiment, the determining the first voltage drop of the first transmission line, the second voltage drop of the second transmission line, and the third voltage drop of each row of pixel units according to the display information of each pixel unit includes: determining a first current flowing through each pixel unit according to the display information of each pixel unit; determining a first voltage drop of the first transmission line according to the first current; the first transmission line is connected with a power supply and is used for transmitting the first voltage to the second transmission line; determining a second voltage drop of the second transmission line according to the first current; the second transmission line is connected with the first transmission line and is used for transmitting the first voltage after the first voltage drop and the second voltage drop to each row of pixel units; and determining a third voltage drop of each row of pixel units according to the first current.
In one embodiment, the determining the first current flowing through each pixel unit according to the display information of each pixel unit includes: the first current flowing through each pixel cell is determined according to the gray scale of each pixel cell.
In one embodiment, the determining the current flowing through each pixel unit according to the gray scale of each pixel unit includes: determining the brightness of the pixel unit according to the gray scale of the pixel unit; and determining the current flowing through the pixel unit according to the brightness.
In one embodiment, the determining the first voltage drop of the first transmission line according to the first current includes: the first voltage drop is determined based on the total current of the first current and the impedance of the first transmission line.
In one embodiment, a plurality of rows of pixel cells divide the second transmission line into a plurality of first portions having the same impedance; adjacent two rows of pixel units are connected through the first part; said determining a second voltage drop of said second transmission line from said first current, comprising: determining a second current of each row of pixel units according to the first current; the second current is the maximum current in the currents flowing through each pixel unit in the single-row pixel units; the second voltage drop of the second transmission line before transmission to each row of pixel cells is determined based on the impedance of the first portion and at least one of the second currents flowing through the first portion.
In one embodiment, said determining said current operating voltage from said first voltage drop, said second voltage drop and said third voltage drop comprises: determining a second voltage to be transmitted to the second transmission line based on the first voltage and the first voltage drop; determining a third voltage transmitted to each row of pixel units according to the second voltage and the second voltage drop; and determining the current working voltage according to the third voltage and the third voltage drop.
In one embodiment, the determining the voltage variation of each pixel unit according to the first voltage input to the display panel and the current operation voltage includes: determining the difference between the first voltage and the current operating voltage as the voltage variation
A second aspect of an embodiment of the present disclosure provides a voltage control apparatus, applied to a display panel, including a plurality of rows of pixel units arranged along a target direction, the apparatus including: the current working voltage determining module is used for determining the current working voltage of each pixel unit according to the display information of each pixel unit; a voltage variation determining module, configured to determine a voltage variation of each pixel unit according to a first voltage input to the display panel and the current operating voltage; the adjusting module is used for adjusting the driving signals of each pixel unit according to the voltage variation; wherein, the drive signal is used for controlling the display effect of each pixel unit.
A third aspect of the disclosed embodiments provides an electronic device, comprising:
a processor and a memory for storing executable instructions capable of executing on the processor, wherein: the processor is configured to execute the executable instructions that, when executed, perform the method of any of the embodiments described above.
In a fourth aspect of the disclosed embodiments, there is provided a non-transitory computer-readable storage medium having stored therein computer-executable instructions that, when executed by a processor, implement the method of any of the above embodiments.
The technical scheme provided by the embodiment of the disclosure can comprise the following beneficial effects:
the embodiment of the disclosure is applied to a plurality of rows of pixel units arranged along a target direction in a display panel, the current working voltage of each pixel unit is determined according to the display information of each pixel unit, then the voltage variation of each pixel unit is determined according to the power supply voltage input to the display panel and the current working voltage, and then the driving signal of each pixel unit is adjusted according to the voltage variation, wherein the driving signal is used for controlling the display effect of each pixel unit. The current working voltage of each pixel, namely the voltage actually obtained by the pixel, is compared with the current working voltage of each pixel and the power supply voltage, and the voltage variation of the pixel unit is determined according to the difference value of the power supply voltage and the current working voltage, so that the driving signal of a single pixel unit can be accurately adjusted, the display effect of each pixel unit can be adjusted, the adjustment precision of adjusting the display effect of each display is improved, the accuracy of adjusting the display effect of the display panel is further improved, and the effect of the whole display panel is improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure.
FIG. 1 is a flow chart illustrating a voltage control method according to an exemplary embodiment;
FIG. 2 is a schematic diagram illustrating one determination of a current operating voltage in accordance with an exemplary embodiment;
fig. 3 is a schematic view showing a connection structure between a first transmission line, a second transmission line, and rows of pixel units in a display panel according to an exemplary embodiment;
FIG. 4 is a schematic diagram illustrating one determination of a second voltage drop, according to an example embodiment;
fig. 5 is a schematic diagram showing a structure of a voltage control apparatus according to an exemplary embodiment;
fig. 6 is a block diagram of a terminal device, according to an example embodiment.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus consistent with some aspects of the disclosure as detailed in the accompanying claims.
In recent years, the permeability of OLEDs on various end products is increasing, down to watches, up to cell phones, tablets, notebooks and even televisions, and the proportion of OLED display panels (panels) used is increasing. Along with the increase of the size of the display panel, the electrical signal transmission line in the display panel is longer and has larger resistance, and the voltage drop IR drop of the Power supply voltage VDD/VSS output to the display area of the display panel by the Power Management Integrated Circuit (PMIC) in the display panel is more serious, so that the influence on the current in the display area of the OLED display panel is more serious, and the actual voltages obtained by the pixel units at different positions in the display area are different, thereby affecting the display uniformity of the display panel and further affecting the yield.
In general, the scheme for improving IR drop reduces the resistance of an electrical signal transmission line in an OLED display panel mainly by widening the width of the transmission line in the display panel or adopting a mesh network (mesh) layout. The PMIC outputs a power supply voltage VDD to a display area of the display panel. However, with the continuous improvement of the resolution of the display panel, the layout space of the display panel is limited, and the widening space of the electric signal transmission line is limited.
Another method for improving IR Drop is through IP improvement of an IC of a display panel, and the IC adjusts a data signal voltage (data voltage) according to a voltage of the IR Drop, thereby ensuring current consistency. In the IC improvement scheme, accurate prediction of VDD voltage distribution is critical to the compensation result, and in the existing IP, a Lookup Table (LUT) is mostly relied on to predict VDD voltage. The method comprises the steps of cutting a screen into a plurality of parts, and adjusting a plurality of parameters in the LUT by using a test result after the screen is lightened. Due to the large number of parameters, debugging takes a long time. Meanwhile, the VDD voltage distribution of different pictures is different, so that multiple times of debugging are required for different pictures, and different screen bodies are required to be respectively debugged, so that the algorithm is low in efficiency and occupies more memory.
Referring to fig. 1, a schematic flow chart of a voltage control method provided in the present technical solution is provided. The method can be applied to a display panel in an electronic device, wherein the display panel comprises a plurality of rows of pixel units arranged along a target direction, and the method comprises the following steps of:
step S100, determining the current working voltage of each pixel unit according to the display information of each pixel unit.
Step S200, determining a voltage variation of each pixel unit according to the first voltage input to the display panel and the current operating voltage.
Step S300, according to the voltage variation, driving signals of the pixel units are adjusted; the driving signals are used for controlling the display effect of each pixel unit.
The method can be at least executed in an electronic device with a display panel and is used for adjusting the voltage of a pixel unit in the display panel so as to adjust the display effect of the display panel. The execution main body of the method at least comprises mobile electronic equipment and fixed electronic equipment, the electronic equipment can comprise mobile phones, tablet computers, vehicle-mounted central control equipment, wearable equipment, intelligent equipment and other electronic equipment with display panels, and the intelligent equipment can also comprise intelligent office equipment, intelligent household equipment and the like.
The display panel is provided with pixel units, the pixel units are used as basic units for display, and the arrangement direction and arrangement mode of the pixel units in the display panel for displaying the information to be displayed can be determined according to actual use requirements. For example, in rows or in columns.
In this embodiment, the plurality of rows of pixel units arranged in the target direction may be a plurality of rows of pixel units arranged in a horizontal row or a plurality of rows of pixel units arranged in a vertical row. The target direction may be determined according to actual requirements, for example, according to a connection manner of the pixel units in the display panel and a connection manner of the electric signal transmission lines.
For step S100, when the display panel is powered on for displaying, the pixel units display according to the electrical signals, and after the pixel units display by emitting light, the current working voltage of each pixel unit, that is, the voltage actually transmitted to the pixel unit, that is, the voltage actually obtained by the pixel unit, can be determined according to the display information of the pixel units. The pixel unit may also be referred to as a pixel or a pixel dot as a minimum light emitting unit and a display unit of the display panel.
The display information of the pixel units may include brightness, gray scale, etc., and the current operating voltage of the pixel unit is determined according to the display information of each pixel unit. The specific determining process is not limited, and the manner of determining the current operating voltage of the pixel unit based on the display information of the pixel unit is within the protection scope of the embodiment. For example, since each pixel unit has a certain impedance, the electric signal transmission line in the display panel also has an impedance, and when the pixel unit and the electric signal transmission line pass through a current, the actual voltage transmitted to each pixel unit, that is, the current operating voltage, can be determined according to the input voltage, the voltage drop of the electric signal transmission line, and the voltage drop of the pixel unit. The input voltage may be a power supply voltage for display on the display panel, or a voltage output from the PMIC in the display panel to the display area of the display panel.
For a pixel unit, the brightness is different, the display information is different, and the determined current working voltage is also different; the gray scale display information is different at the same time, and the determined current working voltage is also different.
In one embodiment, there is a mapping relationship between luminance and gray scale, which can be converted to each other, from which gray scale can be determined, from which luminance can be determined.
For step S200, after determining the current operating voltage of each pixel unit, the voltage variation amount of each pixel unit is determined according to the first voltage input to the display panel and the current operating voltage of each pixel unit. For convenience of description, a power supply voltage or a voltage output from the PMIC to a display area of the display panel is referred to herein as a first voltage. The voltage variation of each pixel unit may represent a difference between a voltage, which should be obtained by each pixel unit, and a current operating voltage, which is a voltage actually obtained by the pixel unit.
Since the display panel has the electric signal transmission line connecting each pixel to the power source or the PMIC, the electric signal transmission line has a certain impedance, and when a current passes through the electric signal transmission line, the electric signal transmission line generates a certain voltage drop, resulting in that the voltage actually obtained by the pixel unit is smaller than the first voltage. The pixel cells themselves have a certain impedance, so that the voltages obtained for the pixel cells in a certain row of pixel cells are also different. The voltage variation between the current operating voltage actually obtained by the pixel unit and the first voltage can be determined according to the first voltage and the current operating voltage actually obtained by each pixel unit. The electric signal transmission line is a wire for transmitting electric current.
For step S300, after determining the voltage variation amounts of the respective pixel units, driving signals of the respective pixel units for controlling the display effects of the respective pixel units are adjusted according to the voltage variation amounts. Since the Display panel also needs to Display according to a data voltage signal output by a Display Driver IC (DDIC) when displaying, the driving signal includes the data voltage signal output by the DDIC obtained by the pixel unit, so the data voltage signal of the pixel unit is adjusted by the voltage variation of the pixel unit, thereby compensating the voltage variation. Therefore, the voltage difference between the current working voltage actually obtained by the pixel unit and the first voltage can be reduced, the influence of the voltage drop of the electric signal transmission line on the current working voltage actually obtained by the pixel unit is reduced, and the display effect of each pixel is improved.
The driving signals of the single pixel units can be accurately adjusted, the current working voltage of each pixel unit can be adjusted, and the current working voltage of each pixel unit is compensated, so that the adjustment precision of adjusting the current working voltage of each pixel unit is improved, the display effect of each pixel unit is further improved, the accuracy of adjusting the display effect of the display panel is improved, and the effect of the whole display panel is finally improved.
In another embodiment, the display panel further includes: and the electric signal transmission line is used for transmitting the voltage signal of the first voltage after passing through the electric signal transmission line to each row of pixel units. The electric signal transmission line has a certain impedance, when current passes through the electric signal transmission line, the electric signal transmission line generates voltage drop, the voltage of the first voltage transmitted to each row of pixel units after passing through the electric signal transmission line is reduced, and the reduction value can be the voltage drop generated by the electric signal transmission line.
In another embodiment, the display panel further includes: the first transmission line and the second transmission line, i.e., the electric signal transmission line, include the first transmission line and the second transmission line. The first transmission line is used for transmitting a first voltage to the second transmission line; the second transmission line is used for transmitting the first voltage after passing through the second transmission line to each row of pixels.
In this embodiment, the first transmission line may be a wire connected to the output terminal of the PMIC, such as a BUS line. The second transmission line may be a wire connected to the first transmission line or may be a BUS line. The connection relation between the second transmission line and the first transmission line is not limited, and the first transmission line may be connected to one end of the second transmission line or may be connected to an intermediate portion between both ends of the second transmission line.
The first transmission line has a certain impedance, when a current flows through the first transmission line, the first transmission line generates a voltage drop, the first voltage is reduced after passing through the first transmission line, and the reduced voltage is the voltage of the first transmission line generating the voltage drop. The voltage transmitted from the first transmission line to the second transmission line is the voltage of the first voltage after passing through the second transmission line, that is, the voltage of the first voltage after being reduced, specifically, the voltage of the first voltage after reducing the voltage drop generated by the first transmission line. The first voltage may be referred to herein as a second voltage after the voltage is reduced through the first transmission line.
The first transmission line is a transmission line through which currents of all pixel units flow, and the currents are transmitted from the PMIC to the second transmission line through the first transmission line, and the currents flowing through the first transmission line are total currents of the currents flowing through all pixel units, that is, the sum of the currents flowing through the pixel units.
Referring to fig. 2, a schematic diagram of determining a current operating voltage is shown. Step S100, determining a current operating voltage of each pixel unit according to display information of each pixel unit, including:
Step S101, determining a first voltage drop of the first transmission line, a second voltage drop of the second transmission line, and a third voltage drop of each row of pixel units according to the display information of each pixel unit.
Step S102, determining the current working voltage according to the first voltage, the first voltage drop, the second voltage drop and the third voltage drop.
After determining the display information of each pixel unit, the current flowing through each pixel unit may be determined according to the display information of each pixel unit, where the current flowing through each pixel unit is denoted as the first current, and the description of the following embodiments may be referred to for specific procedures. Since the first transmission line is connected to the power source, the current flowing through the first transmission line is the sum of the first currents flowing through the respective pixel units, and therefore the first voltage drop generated by the first transmission line can be determined based on the impedance of the first transmission line and the current flowing through the first transmission line. The first transmission line may transmit the first voltage after the first voltage drop and the second voltage drop to the second transmission line.
In this embodiment, the second transmission line is connected to the first transmission line, and is used to transmit the first voltage after the first voltage drop and the second voltage drop to each row of pixel units, where each row of pixel units is connected to the second transmission line in parallel, and referring to fig. 3, the pixel units in fig. 3 are arranged in vertical rows, that is, in columns. After the second transmission line receives the voltage signal transmitted by the first transmission line, since the current will also pass through the second transmission line, the second transmission line will also generate a voltage drop, i.e. a second voltage drop. The magnitude of the second voltage drop may be determined based on the impedance of the second transmission line and the current flowing through the second transmission line. The voltage corresponding to the voltage signal output from the second transmission line is a voltage obtained by reducing the second voltage by the second voltage drop, and the voltage output from the second transmission line to each row of pixel units is referred to as a third voltage.
Each row of pixel units comprises a plurality of connected pixel units, and the connection mode between the pixel units can be referred to as fig. 3. Each pixel unit has a certain impedance, so that the pixel units in each row of pixel units can generate voltage drop when a first current flows through the pixel units, the third voltage transmitted to each row of pixel units by the second transmission line can be reduced after the third voltage passes through the pixels in each row of pixel units, and the third voltage drop generated by each pixel unit can be determined according to the current flowing through each pixel unit and the impedance of each pixel unit.
In another embodiment, determining the first current flowing through each pixel cell may include: the first current flowing through each pixel cell is determined according to the gray scale of each pixel cell.
The pixel units have a mapping relation between the gray scale after light emission and the brightness of the pixel units, the brightness of the pixel units is determined according to the gray scale of the pixel units, the gray scale can be converted into the brightness, and then the current flowing through the pixel units is determined according to the brightness of the pixel units. There is a conversion relationship between the luminance of the pixel cell and the current density, the luminance of the pixel cell is equal to the product of the current efficiency and the current density, the current efficiency is a known amount, the current density can be determined from the luminance, and the cross-sectional area of the passing current of the pixel cell is also known, so that the first current flowing through the pixel cell can be determined from the current density and the cross-sectional area.
The first current flowing through each pixel unit can be determined by the method, and the specification and various parameters of a plurality of pixel units in the display panel can be the same, so that the display of each pixel unit can be controlled conveniently, and the display effect of the display panel can be improved.
In one embodiment, referring to fig. 3, a schematic diagram of a connection structure between a first transmission line, a second transmission line and pixel units in each row in a display panel is shown. In FIG. 3, the first voltage output by the PMIC is VDD0, R 1 Representing the impedance of the first transmission line A, the impedance value of the pixel unit is represented by R 3 R represents 3 The corresponding icon may represent a pixel element, R 3 The connection relationship of the corresponding icons can represent the connection relationship of the pixel units, wherein the output end or the cathode of each pixel unit is connected with a diode, and the cathode of the diode is grounded, such as VSS. The impedances of different pixel units are the same, i.e. R 3 . The multi-row pixel units divide the second transmission line B into a plurality of first parts with the same impedance, and the impedance of each first part is R 2 Two adjacent rows of pixel units are connected through the first part.
Since the VDD trace has current flowing during light emission, there is a voltage drop where there is a resistor. As shown in fig. 3, the first transmission line a is a longitudinal trace connected to the PMIC, and since the current flowing through all the pixels passes through this portion, the first voltage drop of the first transmission line a can be expressed as formula (1):
△V1＝I sum *R 1 , (1)
I sum Representing the current flowing through the first transmission line A, R 1 Representing the impedance of the first transmission line a.
Referring to fig. 4, which is a schematic diagram for determining a second voltage drop, determining the second voltage drop of the second transmission line according to the first current includes:
step S10, determining second currents of pixel units of each row according to the first currents; the second current is the maximum current in the current flowing through each pixel unit in the single row of pixel units.
Step S20, determining the second voltage drop of the second transmission line before the transmission to each row of pixel units according to the impedance of the first portion and at least one second current flowing through the first portion.
Because the first voltage is transmitted to the second transmission line along the first transmission line and then is transmitted to each row of pixel units through the second transmission line, for a certain row of pixel units, because the pixel units sequentially flow through each pixel unit, the current of each pixel unit is sequentially reduced, the current flowing through the pixel unit directly connected with the second transmission line is the largest, and the current flowing through the pixel unit farthest from the second transmission line is the smallest.
As shown in fig. 3, the routing of the electrical signal transmission lines in the array layout of the display panel is generally of a mesh design in the display area (AA area) of the display panel, and in this embodiment the first transmission line is connected in the middle of the second transmission line. The PMIC provides an initial VDD voltage VDD0, the VDD0 drops by DeltaV 1 after passing through the first transmission line, and then the VDD0 drops further after passing through the second transmission line to the left and right sides, wherein the voltage drop at the position farthest from the first transmission line at the left and right sides is the largest, and the third voltage transmitted to the corresponding row of pixel units is the smallest. The voltage output to the mth row is V (m, ymax), then the VDD voltage is further transmitted to the pixel unit far away from the second transmission line in each row of pixels in the display panel by the VDD trace in the pixel unit, and the VDD voltage transmitted to the pixel unit far away from the second transmission line drops most.
The second transmission line is a lateral transmission line of the voltage VDD, and the current gradually increases from the first row (column) of pixel cells on the leftmost/right side. Since the first transmission line is located at the center of the display panel, i.e., the first transmission line is connected to the middle region of the second transmission line, the voltage distribution of each pixel unit is symmetrical with respect to the second transmission line, and thus the voltage drop determining method of the second transmission line on the left and right sides of the display region of the display panel is the same with the first transmission line as the symmetry axis, and the difference is only the current difference due to the display picture difference. Taking the voltage drop of the second transmission line on the left side as an example.
Dividing the second transmission line equally according to the total row number (2N) of the pixel units, wherein the resistance of the first part between two adjacent rows of pixel units is R2, and the leftmost first part is denoted as B 1 And B is connected with 1 The first part adjacent to the right is denoted as B 2 ，B 2 The first part on the right is denoted B 3 Similarly, the first portion of the connection to the first transmission line is denoted as B N . In FIG. 3 only B is shown 1 And B 2 。
As can be seen from fig. 3, the current flowing through the different first portions is different, and the current flowing through the first portion having a smaller distance from the first transmission line is smaller as the current flowing through the first portion having a larger distance from the first transmission line is larger. For a certain first portion, the current flowing through that first portion is: the current flowing through the first portion spaced from the first transmission line is greater than the sum of the currents flowing through the first portion spaced from the first transmission line. The leftmost row in the left half of the display panel is denoted as a first row X by taking the first transmission line as a symmetry axis 1 With the first row X 1 Is a second row X 2 And a second row X 2 Is a third row X 3 And so on to the X N And (5) arranging. X is X 1 And X 2 Between B is 1 ，X 2 And X 3 Between B is 2 And so on.
For example, for B1, flow through B 1 The current of (2) is the first row X 1 Is set to be the total current I of 1 Flow through B 2 The current of (2) isFirst row X 1 Is set to be the total current I of 1 +second row X 2 Is set to be the total current I of 2 By analogy, flow through B N The current of (2) is the first row X 1 Is set to be the total current I of 1 +second row X 2 Is set to be the total current I of 2 + … Nth row X N Is set to be the total current I of N . The total pressure drop Δv2 of the left half of the second transmission line can be expressed as formula (2):
where Ii is the total current of the pixel cells of the ith row.
Step S102, determining the current working voltage according to the first voltage drop, the second voltage drop and the third voltage drop, comprising:
and determining a second voltage transmitted to the second transmission line according to the first voltage and the first voltage drop, determining a third voltage transmitted to each row of pixel units according to the second voltage and the second voltage drop, and determining the current working voltage according to the third voltage and the third voltage drop.
The leftmost row in the left half of the display panel is denoted as the first row, and the third voltage transmitted to the first row is denoted as VDD (X) 1 ，Y max ) I.e. leftmost (first column), bottommost (Y max Row) pixel cell voltage, VDD (X) 1 ，Y max ) Can be represented by the formula (3),
VDD(X 1 ，Y max )＝VDD0-△V1-△V2 (3)
the third voltage transmitted to the mth row (column) is denoted as VDD (X) m ，Y max ) I.e. the X m Column Y max The VDD voltages corresponding to the row of pixel cells are expressed by equation (4):
I i the maximum current of the i-th row is indicated, and the total current of the i-th row is also indicated.Representing a second voltage drop across the second transmission line before transmission to the ith row of pixel cells. VDD 0-DeltaV 1 represents the second voltage, VDD (X m ，Y max ) Representing a third voltage transmitted to the m-th row of pixel cells.
The pixel unit of the AA area also has voltage drop, although the VDD wiring of the AA area is designed as a mesh, the longitudinal transmission line is a titanium aluminum titanium (Ti-Al-Ti) transmission line, the sheet resistance is 0.05, the transverse wiring is a molybdenum (Mo) transmission line, the sheet resistance is 0.5, and the resistivity of the two is 10 times different, so that the transverse flow of current is generally ignored, and the partial pressure of the longitudinal wiring is considered.
The VDD voltage drop distribution of the pixel cells of the m-th row (column) is based on VDD (Xi, ymax), and then the voltage distribution is performed according to the current information of the pixel cells of the m-th row. Taking the mth row (column) as an example, the second transmission line transmits the voltage VDD (X) to the pixel units of the mth row (column) m ，Y max ) The voltage of the pixel cell of the m-th row (column) farthest from the second transmission line, i.e., the topmost voltage is VDD (X m ，0)。
The current distribution between each pixel unit in the m-th row (column) of pixel units is similar to the current of each first part in the second transmission line, if the longitudinal wiring resistance between each row of pixel units in the AA area is R 3 Through the first row R 3 The current of (1) is i (m), the second row R 3 I (m, 1) +i (m, 2), and so on, Y max The current of the row isThe voltage drop from the first row to the last row can be expressed by equation (5):
the current working voltage of the pixel unit in the nth row, that is, the voltage actually transmitted to the mth row, is:
wherein i (m, y) is the current obtained by subtracting the current of i (m, y-1) from the first current of the pixel unit of the mth column, the first current of the pixel unit of the mth row, the current of the pixel unit of the mth column, the current of the pixel unit of the y-1 row is subtracted from the current of the pixel unit of the mth column, the current obtained by subtracting the sum of the first currents of the pixel units of the mth column, the 0 th row. VDD (m, n) is denoted as the current operating voltage of the mth column, nth row pixel cell.
In another embodiment, step S200, determining the voltage variation of each pixel unit according to the first voltage and the current operating voltage input to the display panel, includes:
and determining the difference value between the first voltage and the current working voltage as a voltage variation.
The VDD voltage distribution of the whole panel can be obtained through the method provided by the patent. R of different display panels 1 、R 2 And R is 3 If the input image changes, the current of the corresponding pixel unit may be adjusted. According to the obtained current working voltage of each pixel unit, namely the VDD voltage distribution, driving signals of each pixel unit are correspondingly adjusted, such as data voltage (data voltage), so that voltage drop between the current working voltage and the first voltage of each pixel unit in the display panel, namely VDD IR drop, can be accurately compensated.
The schemes of the above embodiments can be directly embedded into a processor, according to an image to be displayed and R1, R2 and R3 in a display panel, voltage drops corresponding to each pixel, namely VDD IR drop data, can be determined, and then data signals of each pixel unit are adjusted, for example, gray scale data to be output are adjusted, and corrected data are transmitted to a DDIC, so that an image subjected to accurate compensation can be displayed.
In another embodiment, referring to fig. 5, a schematic structure of a voltage control apparatus, which may be applied to a display panel, includes a plurality of rows of pixel units arranged along a target direction, the apparatus includes:
The current working voltage determining module 1 is used for determining the current working voltage of each pixel unit according to the display information of each pixel unit;
a voltage variation determining module 2, configured to determine a voltage variation of each pixel unit according to a first voltage input to the display panel and the current operating voltage;
an adjustment module 3, configured to adjust driving signals of the pixel units according to the voltage variation; the driving signals are used for controlling the display effect of each pixel unit.
In another embodiment, the display panel further includes: a first transmission line and a second transmission line; wherein the first transmission line is used for transmitting the first voltage to the second transmission line; the second transmission line is used for transmitting the first voltage after passing through the second transmission line to each row of pixels;
the current operating voltage determining module 1 includes:
a voltage drop determining sub-module, configured to determine, according to display information of each pixel unit, a first voltage drop of the first transmission line, a second voltage drop of the second transmission line, and a third voltage drop of each row of pixel units, respectively;
And the current working voltage determining submodule is used for determining the current working voltage according to the first voltage, the first voltage drop, the second voltage drop and the third voltage drop.
In another embodiment, a voltage drop determination sub-module includes:
a first current determining unit configured to determine a first current flowing through each pixel unit according to display information of each pixel unit;
a first voltage drop determining unit configured to determine a first voltage drop of the first transmission line based on the first current; wherein the first transmission line is connected with a power supply;
a second voltage drop determining unit configured to determine a second voltage drop of the second transmission line based on the first current; the second transmission line is connected with the first transmission line and is used for transmitting the first voltage after the first voltage drop and the second voltage drop to each row of pixel units;
a third voltage drop determining unit configured to determine a third voltage drop of each pixel unit in each row of pixel units according to the first current; wherein, each row of pixel units is connected on the second transmission line in parallel.
In another embodiment, the first current determining unit is specifically configured to:
the first current flowing through each pixel cell is determined according to the gray scale of each pixel cell.
In another embodiment, the first current determining unit includes:
a brightness determination subunit, configured to determine brightness of the pixel unit according to a gray level of the pixel unit;
and the first current determining subunit is used for determining a first current flowing through the pixel unit according to the brightness.
In another embodiment, the first voltage drop determining unit is specifically configured to:
the first voltage drop is determined based on the total current of the first current and the impedance of the first transmission line.
In another embodiment, a plurality of rows of pixel units divide the second transmission line into a plurality of first portions having the same impedance; adjacent two rows of pixel units are connected through the first part;
a second voltage drop determination unit comprising:
a second current determining subunit configured to determine a second current of each row of pixel units according to the first current; the second current is the maximum current in the currents flowing through each pixel unit in the single-row pixel units;
a dot voltage drop determining subunit for determining the second voltage drop of the second transmission line before being transmitted to each row of pixel units according to the impedance of the first portion and at least one of the second currents flowing through the first portion.
In another embodiment, the present operating voltage determination sub-module includes:
a second voltage determining unit configured to determine a second voltage transmitted to the second transmission line based on the first voltage and the first voltage drop;
a third voltage determining unit configured to determine a third voltage to be transmitted to each row of pixel units based on the second voltage and the second voltage drop;
and the current working voltage determining unit is used for determining the current working voltage according to the third voltage and the third voltage drop.
In another embodiment, the voltage variation determining module 2 is specifically configured to: and determining the difference value between the first voltage and the current working voltage as the voltage variation.
In another embodiment, there is also provided an electronic device including:
a processor and a memory for storing executable instructions capable of executing on the processor, wherein:
the processor is configured to execute the executable instructions that, when executed, perform the method of any of the embodiments described above.
In another embodiment, there is also provided a non-transitory computer readable storage medium having stored therein computer executable instructions that when executed by a processor implement the method of any of the above embodiments.
It should be noted that, the "first" and "second" in the embodiments of the present disclosure are merely for convenience of expression and distinction, and are not otherwise specifically meant.
Fig. 6 is a block diagram of a terminal device, according to an example embodiment. For example, the terminal device may be a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, an exercise device, a personal digital assistant, or the like having a display panel.
Referring to fig. 6, the terminal device may include one or more of the following components: a processing component 802, a memory 804, a power component 806, a multimedia component 808, an audio component 810, an input/output (I/O) interface 812, a sensor component 814, and a communication component 816.
The processing component 802 generally controls overall operation of the terminal device, such as operations associated with presentation, telephone calls, data communications, camera operations, and recording operations. The processing component 802 may include one or more processors 820 to execute instructions to perform all or part of the steps of the methods described above. Further, the processing component 802 can include one or more modules that facilitate interactions between the processing component 802 and other components. For example, the processing component 802 can include a multimedia module to facilitate interaction between the multimedia component 808 and the processing component 802.
The memory 804 is configured to store various types of data to support operations at the terminal device. Examples of such data include instructions for any application or method operating on the terminal device, contact data, phonebook data, messages, pictures, video, etc. The memory 804 may be implemented by any type or combination of volatile or nonvolatile memory devices such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disk.
The power component 806 provides power to the various components of the terminal device. The power components 806 may include a power management system, one or more power sources, and other components associated with generating, managing, and distributing power for the terminal devices.
The multimedia component 808 includes a screen between the terminal device and the user that provides an output interface. In some embodiments, the screen may include a Liquid Crystal Display (LCD) and a Touch Panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive input signals from a user. The touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. The touch sensor may sense not only the boundary of a touch or sliding action, but also the duration and pressure associated with the touch or sliding operation. In some embodiments, the multimedia component 808 includes a front camera and/or a rear camera. The front camera and/or the rear camera may receive external multimedia data when the terminal device is in an operation mode, such as a photographing mode or a video mode. Each front camera and rear camera may be a fixed optical lens system or have focal length and optical zoom capabilities.
The audio component 810 is configured to output and/or input audio signals. For example, the audio component 810 includes a Microphone (MIC) configured to receive external audio signals when the terminal device is in an operational mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals may be further stored in the memory 804 or transmitted via the communication component 816. In some embodiments, audio component 810 further includes a speaker for outputting audio signals.
The I/O interface 812 provides an interface between the processing component 802 and peripheral interface modules, which may be a keyboard, click wheel, buttons, etc. These buttons may include, but are not limited to: homepage button, volume button, start button, and lock button.
The sensor assembly 814 includes one or more sensors for providing status assessment of various aspects for the terminal device. For example, the sensor assembly 814 may detect an on/off state of the terminal device, a relative positioning of the assemblies, such as a display and keypad of the terminal device, the sensor assembly 814 may also detect a change in position of the terminal device or one of the assemblies of the terminal device, the presence or absence of user contact with the terminal device, an orientation or acceleration/deceleration of the terminal device, and a change in temperature of the terminal device. The sensor assembly 814 may include a proximity sensor configured to detect the presence of nearby objects without any physical contact. The sensor assembly 814 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 814 may also include an acceleration sensor, a gyroscopic sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.
The communication component 816 is configured to facilitate communication between the terminal device and other devices, either wired or wireless. The terminal device may access a wireless network based on a communication standard, such as WiFi,4G or 5G, or a combination thereof. In one exemplary embodiment, the communication component 816 receives broadcast signals or broadcast related information from an external broadcast management system via a broadcast channel. In one exemplary embodiment, the communication component 816 further includes a Near Field Communication (NFC) module to facilitate short range communications. For example, the NFC module may be implemented based on a Radio Frequency Identification (RFID) technology, an infrared data association (IrDA) technology, an Ultra Wideband (UWB) technology, a Bluetooth (BT) technology, and other technologies.
In an exemplary embodiment, the terminal device may be implemented by one or more Application Specific Integrated Circuits (ASICs), digital Signal Processors (DSPs), digital Signal Processing Devices (DSPDs), programmable Logic Devices (PLDs), field Programmable Gate Arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic elements for executing the methods described above.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This disclosure is intended to cover any adaptations, uses, or adaptations of the disclosure following the general principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (12)
1. A voltage control method applied to a display panel including a plurality of rows of pixel cells arranged in a target direction, the method comprising:
determining the current working voltage of each pixel unit according to the display information of each pixel unit;
determining a voltage variation amount of each pixel unit according to a first voltage input to the display panel and the current operating voltage;
adjusting driving signals of the pixel units according to the voltage variation; the driving signals are used for controlling the display effect of each pixel unit.
2. The method of claim 1, wherein the display panel further comprises: a first transmission line and a second transmission line; wherein the first transmission line is used for transmitting the first voltage to the second transmission line; the second transmission line is used for transmitting the first voltage after passing through the second transmission line to each row of pixel units;
The determining the current working voltage of each pixel unit according to the display information of each pixel unit comprises the following steps:
determining a first voltage drop of the first transmission line, a second voltage drop of the second transmission line and a third voltage drop of each row of pixel units according to display information of each pixel unit;
and determining the current working voltage according to the first voltage, the first voltage drop, the second voltage drop and the third voltage drop.
3. The method according to claim 2, wherein determining the first voltage drop of the first transmission line, the second voltage drop of the second transmission line, and the third voltage drop of each row of pixel units, respectively, based on the display information of each pixel unit, comprises:
determining a first current flowing through each pixel unit according to the display information of each pixel unit;
determining a first voltage drop of the first transmission line according to the first current; wherein the first transmission line is connected with a power supply;
determining a second voltage drop of the second transmission line according to the first current; the second transmission line is connected with the first transmission line and is used for transmitting the first voltage after the first voltage drop and the second voltage drop to each row of pixel units;
Determining a third voltage drop of each pixel unit in each row of pixel units according to the first current; wherein, each row of pixel units is connected on the second transmission line in parallel.
4. A method according to claim 3, wherein determining the first current flowing through each pixel cell based on the display information of each pixel cell comprises:
the first current flowing through each pixel cell is determined according to the gray scale of each pixel cell.
5. The method of claim 4, wherein determining the first current flowing through each pixel cell based on the gray scale of each pixel cell comprises:
determining the brightness of the pixel unit according to the gray scale of the pixel unit;
and determining the first current flowing through the pixel unit according to the brightness.
6. A method according to claim 3, wherein said determining a first voltage drop of said first transmission line from said first current comprises:
the first voltage drop is determined based on the total current of the first current and the impedance of the first transmission line.
7. A method according to claim 3, wherein a plurality of rows of pixel cells divide the second transmission line into a plurality of first portions of the same impedance; adjacent two rows of pixel units are connected through the first part;
Said determining a second voltage drop of said second transmission line from said first current, comprising:
determining a second current of each row of pixel units according to the first current; the second current is the maximum current in the currents flowing through each pixel unit in the single-row pixel units;
the second voltage drop of the second transmission line before transmission to each row of pixel cells is determined based on the impedance of the first portion and at least one of the second currents flowing through the first portion.
8. The method of claim 2, wherein the determining the current operating voltage from the first voltage drop, the second voltage drop, and the third voltage drop comprises:
determining a second voltage to be transmitted to the second transmission line based on the first voltage and the first voltage drop;
determining a third voltage transmitted to each row of pixel units according to the second voltage and the second voltage drop;
and determining the current working voltage according to the third voltage and the third voltage drop.
9. The method according to claim 1, wherein the determining the voltage variation of each pixel cell according to the first voltage input to the display panel and the current operation voltage includes:
And determining the difference value between the first voltage and the current working voltage as the voltage variation.
10. A voltage control apparatus, applied to a display panel, comprising a plurality of rows of pixel cells arranged in a target direction, the apparatus comprising:
the current working voltage determining module is used for determining the current working voltage of each pixel unit according to the display information of each pixel unit;
a voltage variation determining module, configured to determine a voltage variation of each pixel unit according to a first voltage input to the display panel and the current operating voltage;
the adjusting module is used for adjusting the driving signals of the pixel units according to the voltage variation; the driving signals are used for controlling the display effect of each pixel unit.
11. An electronic device, comprising:
a processor and a memory for storing executable instructions capable of executing on the processor, wherein:
a processor for executing the executable instructions, which when executed perform the method of any of the preceding claims 1 to 9.
12. A non-transitory computer readable storage medium having stored therein computer executable instructions which when executed by a processor implement the method of any one of the preceding claims 1 to 9.
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