Display panel, driving method thereof and electronic device

Abstract

The display panel comprises a plurality of data lines, a plurality of gate lines, and at least one sensing line. The sensing line is arranged in parallel with the data line, and the sensing line and the gate line have a second insulating layer therebetween. The orthogonal projection of each sensing line on a display surface has an overlapping area with the orthogonal projection of all gate lines on the display surface. The sensing line is connected with a collection unit under the control of a first switch. The collection unit is used to collect a jump waveform of the gate line sensed by the sensing line in a current display frame. The sensing line is reset under the control of a second switch. The display panel of the present disclosure increases the sensing line to collect the jump of the gate line. The collection and reset of the sensing line are realized through the first switch and the second switch. The collected jump waveform is used for compensation value calculation. The crosstalk problem in the display process of the display panel is avoided, and the display panel has better display effect.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a display panel, a driving method thereof, and an electronic device. Background Art

[0002] As the resolution and refresh rate of existing organic light-emitting semiconductor panels (OLEDs) continue to increase, crosstalk problems often occur during the display process. The traditional solution is to optimize the routing layout, but as the resolution and refresh rate continue to increase, traditional solutions have become difficult to solve. Summary of the Invention

[0003] The purpose of the embodiments of the present disclosure is to provide a display panel and a driving method thereof, and an electronic device, so as to solve the crosstalk problem of the display panel during the display process in the prior art.

[0004] The embodiments of the present disclosure adopt the following technical solutions: a display panel, comprising at least: a plurality of data lines extending along a first direction, all of the data lines being arranged in sequence along a second direction, adjacent data lines being insulated from each other, the first direction and the second direction being perpendicular to each other on a display surface of the display panel; a plurality of gate lines extending along the second direction, all of the gate lines being arranged in sequence along the first direction, adjacent gate lines being insulated from each other, and a first insulating layer being provided between the data lines; and at least one sensing line, the sensing line being arranged parallel to the data line, and a second insulating layer being provided between the sensing line and the gate line, such that an orthographic projection of each sensing line on the display surface has an overlapping area with an orthographic projection of all gate lines on the display surface; wherein the sensing line is connected to a collection unit under the control of a first switch, the collection unit being configured to collect a jump waveform on the gate line in a current display frame sensed by the sensing line; and the sensing line is reset under the control of a second switch.

[0005] In some embodiments, the first switch is turned on during the charging phase of the pixel and turned off during the light emitting phase of the pixel; the second switch is turned off during the charging phase of the pixel and turned on during the light emitting phase of the pixel.

[0006] In some embodiments, the sensing line and the data line are disposed in the same layer.

[0007] In some embodiments, the device further includes a compensation unit, which determines a compensation voltage according to the jump waveform and image information of a current display frame to compensate the data line.

[0008] In some embodiments, the compensation unit is specifically used to determine the jumping gate line according to the jumping waveform and the scanning timing of the gate line; determine the polarity and amplitude of the jumping voltage according to the jumping waveform; determine the data line to be compensated according to the image information; determine the compensation voltage according to the polarity and amplitude of the jumping voltage, the jumping gate line and the data line to be compensated; and compensate the data line to be compensated according to the compensation voltage.

[0009] In some embodiments, the first switch and the second switch are multiplex switches.

[0010] In some embodiments, the display panel is an organic light emitting semiconductor panel.

[0011] An embodiment of the present disclosure further provides a method for driving the display panel, comprising: turning on a first switch and turning off a second switch, so that a collection unit collects a transition waveform on a gate line sensed on a sensing line; turning off the first switch and turning on the second switch, and resetting the sensing line through a reset signal.

[0012] In some embodiments, after the acquisition unit acquires the jump waveform on the gate line sensed on the sensing line, it also includes: determining the jumped gate line according to the jump waveform and the scanning timing of the gate line; determining the polarity and amplitude of the jump voltage according to the jump waveform; determining the data line to be compensated according to the image information; determining the compensation voltage according to the polarity and amplitude of the jump voltage, the jumped gate line and the data line to be compensated; and compensating the data line to be compensated according to the compensation voltage.

[0013] An embodiment of the present disclosure further provides an electronic device, characterized in that the electronic device at least includes the above-mentioned display panel.

[0014] The beneficial effects of the embodiments of the present disclosure are as follows: a sensing line is added to the display panel to collect the jump conditions on the gate line, and the collection and resetting of the sensing line are realized through the first switch and the second switch. A more accurate compensation value calculation can be performed based on the collected jump waveform, thereby avoiding the crosstalk problem that occurs in the display panel during the display process, and making the display panel have a better display effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0016] Figure 1 This is a schematic diagram of a 3*3 pixel array OLED display panel in the prior art;

[0017] Figure 2 A schematic diagram of the image displayed on the display panel in the current frame;

[0018] Figure 3 Schematic diagram of the principle of the display panel in the first embodiment of the present disclosure;

[0019] Figure 4 This is a schematic diagram of the connection of sensing lines in the first embodiment of the present disclosure;

[0020] Figure 5 This is a working timing diagram of the display panel in the first embodiment of the present disclosure;

[0021] Figure 6 for Figure 3 The hierarchical structure of the display panel in the middle dotted box;

[0022] Figure 7 FIG. 4 is a flow chart of a method for driving a display panel in the second embodiment of the present disclosure. DETAILED DESCRIPTION

[0023] Various aspects and features of the present disclosure are described herein with reference to the accompanying drawings.

[0024] It should be understood that various modifications may be made to the embodiments disclosed herein. Therefore, the above description should not be considered as limiting, but merely as an example of an embodiment. Other modifications within the scope and spirit of the present disclosure will occur to those skilled in the art.

[0025] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the general description of the present disclosure given above and the detailed description of the embodiments given below, serve to explain the principles of the present disclosure.

[0026] These and other characteristics of the present disclosure will become apparent from the following description of a preferred form of embodiment given as a non-limiting example with reference to the accompanying drawings.

[0027] It should also be understood that although the present disclosure has been described with reference to certain specific examples, those skilled in the art will be able to realize many other equivalent forms of the present disclosure that have the features of the claims and are therefore within the scope of protection defined thereby.

[0028] The above and other aspects, features and advantages of the present disclosure will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

[0029] Specific embodiments of the present disclosure will be described hereinafter with reference to the accompanying drawings; however, it should be understood that the claimed embodiments are merely examples of the present disclosure, which may be implemented in a variety of ways. Well-known and / or repetitive functions and structures are not described in detail to avoid obscuring the present disclosure with unnecessary or redundant detail. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but rather serve merely as a basis and representative basis for teaching those skilled in the art to variously employ the present disclosure with substantially any suitable detailed structure.

[0030] This description may use the phrases "in one embodiment," "in another embodiment," "in a further embodiment," or "in other embodiments," each of which may refer to one or more of the same or different embodiments according to the present disclosure.

[0031] As the resolution and refresh rate of existing OLED panels continue to increase, crosstalk problems often occur during the display process. The traditional solution is to optimize the layout of the wiring. However, as the resolution and refresh rate continue to increase, the traditional solution has become difficult to solve. Figure 1 and Figure 2 The principle of crosstalk is explained.

[0032] Figure 1 The schematic diagram of an OLED display panel with a 3*3 pixel array is shown. Figure 1 As shown, the display panel includes a plurality of data lines Source extending along a first direction. The plurality of data lines are sequentially arranged in a second direction. Adjacent data lines are insulated from each other and are respectively used to input data signals to pixels on different columns. Figure 1 There are three data lines shown in total, Source1, Source2 and Source3 from left to right. Figure 1 The first direction is the vertical direction, and the second direction is the horizontal direction. During actual manufacturing, it is sufficient to ensure that the first and second directions are perpendicular to each other within the display surface of the display panel. The panel also includes multiple gate lines extending along the second direction. These multiple gate lines are arranged in sequence in the first direction, with adjacent gate lines insulated from each other. They are used to control the data signal input from the data line to pixels on different rows. Figure 1 There are three gate lines shown in the figure, namely gate1, gate2 and gate3 from top to bottom. Figure 1 T1, T2, T3 and Cst constitute the driving circuit of the light-emitting unit LED. This circuit lights up the light-emitting unit under the drive of the data signal and the gate signal. ELVDD and ELVSS are the working signals of the driving circuit. Each light-emitting unit LED can be identified as a pixel.

[0033] When the display panel displays an image, for one frame of the image, one row of pixels is lit in sequence from top to bottom, and the data lines also input different voltages according to the timing of the gate lines, thereby realizing the presentation of different grayscales between pixels. Figure 2 The image displayed in the current frame of the display panel has a grayscale of 128 and a grayscale of 0 for the black part. Since the scanning direction is from top to bottom, when scanning the boundary pixel row between the gray area and the black area, the voltage values ​​applied on most of the data lines will jump directly from the voltage of 128 grayscale to the voltage of 0 grayscale. Since there are too many data lines with voltage jumps, the jumped voltage is transmitted to the entire gate line through the coupling capacitor Cx between the data line and the gate line. Since the gate line has a coupling capacitor with all the data lines at the same time, the voltage change on the gate line will be transmitted to the data line where no jump occurs (i.e. Figure 2 In the example, the data line corresponding to the pixel column in the gray area between the two black areas in the image is changed, thereby changing the voltage value on the data line. Since the pixels in the boundary pixel row are in the on state under the control of the gate line T1, the data line that originally did not jump is affected by the coupling of the gate line, causing its voltage value to change, thereby causing the value of the capacitor Cst on the pixels in this row to jump. The voltage value of Cst is actually the voltage applied to the anode of the light-emitting unit, that is, the display value of the light-emitting unit, thereby causing the crosstalk problem of the white line at the corresponding position; similarly, when scanning the boundary pixel row between the black area and the gray area below, the crosstalk problem of the black line will occur, thereby affecting the overall display effect of the display panel and reducing the user experience.

[0034] It should be noted that Figure 2 The display panel shown in the figure has a crosstalk problem when jumping from 128 grayscale to 0 grayscale and from 0 grayscale to 128 grayscale. Corresponding to different models, different manufacturing processes, different resolutions or refresh rates of display panels, two adjacent rows of pixels may have a crosstalk problem when there is any degree of grayscale change, but the performance may be different on different display panels. Therefore, the embodiments of the present disclosure are not limited to optimizing the crosstalk problem when switching between 128 grayscale and 0 grayscale.

[0035] In order to solve the above problems, the first embodiment of the present disclosure provides a display panel, which mainly refers to an OLED panel, and its principle schematic diagram is as follows: Figure 3 In this embodiment, the data line Source and the gate line gate are arranged in the same manner as Figure 1Similarly, the driving process of each light-emitting unit LED is also consistent with the existing technology, that is, the display panel includes at least a plurality of data lines extending along the first direction, all the data lines are arranged in sequence along the second direction, adjacent data lines are insulated, and the first direction and the second direction are perpendicular to the display surface of the display panel; a plurality of gate lines extending along the second direction, all the gate lines are arranged in sequence along the first direction, and adjacent gate lines are insulated; in addition, there is at least a first insulating layer between the data lines and the gate lines, and a coupling capacitor Cx is formed at the overlapping position between the positive projections of the data lines and the gate lines on the display surface, and the voltage jumps on the data lines may be transmitted to the gate lines through the coupling capacitor, and vice versa.

[0036] and Figure 1 The difference is that the display panel in this embodiment also includes at least one sensing line, which is arranged parallel to the data line and also extends along the first direction (i.e., the vertical direction), and there is at least a second insulating layer between the sensing line and the gate line, that is, the gate line and the sensing line are arranged in different layers. At the same time, there is an overlapping area between the orthographic projection of the sensing line on the display surface and the orthographic projection of each gate line on the display surface. Combined with the design of the second insulating layer, a coupling capacitor Cx' is formed between the sensing line and each gate line. When the gate line jumps due to the voltage fluctuation of the data line, based on the existence of the coupling capacitor Cx', the sensing line can sense the jump on the gate line and generate a corresponding jump waveform, thereby realizing sensing of the jump on the gate line.

[0037] Specifically, if Figure 4 As shown, the sensing line in this embodiment is connected to the acquisition unit ADC through the first switch S1. The acquisition unit usually refers to an analog-to-digital converter provided in the driver chip (Driver IC) of the display panel, which can acquire the jump waveform of the gate line sensed by the sensing line in the current display frame and convert it into a digital signal for subsequent processing; at the same time, the sensing line is also connected to the reset signal terminal Vint through the second switch S2 to realize the reset operation of the sensing line.

[0038] The following combination Figure 5 The timing diagram shown explains the working principle of the sense line.

[0039] Only one of the first switch and the second switch is in the closed state at the same time, and the other is in the open state. That is, the sensing line will implement the alternating operation of reset and acquisition based on the opening and closing states of the first switch and the second switch. That is, when the first switch is closed and turned on, the sensing line senses the jump waveform, and the acquisition unit performs corresponding acquisition. When the second switch is closed and turned on, the reset signal is used to reset and initialize the sensing line to ensure the accuracy of the next sensing.

[0040] The closing and opening of the first switch and the second switch are performed alternately, that is, the sensing process and the reset process can be controlled by controlling the timing of the first switch and the second switch. For a complete driving process of a single pixel, it at least includes a charging stage and a light-emitting stage. In the charging stage, the gate line inputs a gate signal to turn on T1, and the data signal applied on the data line can charge the capacitor Cst. When the capacitor Cst is charged to a certain level, T3 can be turned on. At this time, the lighting stage begins and the LED is lit; that is, if the grayscale to be presented by the current pixel is the same as that of the previous pixel in the same column, When there is a large gap between the presented grayscales, there is a large jump in the voltage applied to the data line corresponding to the column of pixels. In the charging stage, the jump can be coupled to the gate line. At this time, the first switch can be controlled to close and turn on, and the second switch can be disconnected, so that the sensing line senses the jump on the gate line, and the corresponding jump waveform is collected by the acquisition unit; in the lighting stage, the voltage applied to the data line has stabilized, and the corresponding voltage jump on the gate line has basically disappeared. At this time, the first switch is disconnected, and the second switch is closed and turned on to reset the sensing line, so that it can sense the jump in the next row of gate lines.

[0041] It should be noted that in this embodiment Figure 5 The timing diagram shown is only for illustrating the waveforms of various signals. The specific duration of applying the effective signal of each signal is adjusted according to actual needs, and this embodiment does not limit or illustrate this.

[0042] Furthermore, if Figure 4 As shown, the display panel also includes a compensation unit 100, which can be connected to the acquisition unit ADC and the main control AP of the display panel. The acquisition unit converts the acquired jump waveform into a digital signal and transmits it to the compensation unit 100. At the same time, the main control AP also inputs the image information of the current display frame into the compensation unit 100. The compensation unit 100 can determine the compensation voltage according to the digital signal and image information corresponding to the above-mentioned jump waveform, and compensate the data line that generates crosstalk due to the gate line jump through the compensation voltage to ensure a good display effect of the display panel.

[0043] Specifically, after receiving the jump waveform and converting it into a digital signal, the compensation unit 100 can further determine the polarity and amplitude of the jump voltage coupled on the gate line according to the jump waveform, that is, whether the voltage on the corresponding data line jumps from a high voltage to a low voltage or from a low voltage to a high voltage and the amplitude of the jump; at the same time, since the gate line is scanned from top to bottom, the jump sensed on the sensing line at any time corresponds to the jump corresponding to the gate line of the current input valid level, and the compensation unit 100 can determine the current jumping gate line according to the scanning timing of its gate line and the acquisition time of the jump waveform; in addition, the compensation unit 100 can be based on the image The information determines which data lines currently have voltage jumps among all data lines, that is, based on the grayscale changes reflected in the image information, it is determined which data lines have significantly changed in voltage. After excluding the aforementioned data lines with jumps, the data lines that have not experienced jumps are the data lines to be compensated for crosstalk caused by the jumps. The compensation unit 100 determines the compensation voltage based on the polarity and amplitude of the jump voltage, the current jump gate line, and the data line to be compensated. Finally, before the lighting stage, the compensated data lines are compensated based on the compensation voltage to avoid crosstalk problems. It should be understood that the process of determining the compensation voltage and compensating the data lines based on the compensation voltage can be directly performed using conventional means, and this embodiment will not be described in detail here.

[0044] In some embodiments, the sensing line can be provided in the same layer as the data line, that is, the data line and the sensing line can be formed at the same time using the same material and the same preparation method. Figure 3 The hierarchical structure of the display panel in the dotted box is as follows Figure 6 As shown, the first insulating layer and the second insulating layer are actually the same insulating layer SiNx in this case. The PLN layer covering the data line and the sensing line is a flat layer, which is used to protect the data line and the sensing line and form a flat upper surface for subsequent layer preparation. The PI layer is a base layer for supporting other layers. TFT is used to represent other layers forming thin film transistors besides the gate line, including but not limited to semiconductor layer, interlayer insulating layer, source and drain metal layer, gate insulating layer, etc. Its specific structure can refer to the actual OLED panel layer design. Figure 6 It is only used to illustrate the positions of the sensing lines, data lines and gate lines.

[0045] In some embodiments, the number of sensing lines can be one or more. When only one sensing line is set, the sensing line can be mainly set in the peripheral area of ​​the display panel; if multiple sensing lines are set at the same time, all data lines can be partitioned, and a sensing line is set in each area. The jump sensed by the sensing line in the area is the jump of the data line included in the area. When determining the data line to be compensated and the compensation voltage, more accurate results can be obtained, thereby optimizing the compensation effect.

[0046] In actual implementation, the first switch and the second switch can be implemented using independent thin film transistors TFT, or can be implemented using a multiplexing switch MUX, or can be implemented using other types of switches with the same function.

[0047] In this embodiment, a sensing line is added to the display panel to collect the transition conditions on the gate line. The sensing line is collected and reset through the first switch and the second switch. The collected transition waveform can be used to calculate a more accurate compensation value, thereby avoiding the crosstalk problem that occurs during the display process of the display panel and providing the display panel with a better display effect.

[0048] Based on the same inventive concept, the second embodiment of the present disclosure provides a driving method of the display panel of the first embodiment, and its flow chart is as follows: Figure 7 As shown, it mainly includes steps S10 and S20:

[0049] S10, turning on the first switch and turning off the second switch, so that the acquisition unit acquires the transition waveform on the gate line sensed by the sensing line;

[0050] S20, turning off the first switch and turning on the second switch, resetting the sensing line through a reset signal.

[0051] The driving method provided in this embodiment mainly refers to the acquisition of the jump situation of the sensing line pair and the reset of the sensing line by controlling the first switch and the second switch. The specific sensing principle has been described in the first embodiment and will not be repeated here; and corresponding to the design of the row scan implemented in the display panel, the above-mentioned step S10 is mainly implemented in the charging stage of the pixel, and the step S20 is mainly implemented in the lighting stage of the pixel, and when scanning to the next row of pixels, the above-mentioned S10 and S20 are re-executed. It is actually a cyclic operation, which starts at the moment the display panel is lit and ends when the display panel is powered off.

[0052] Furthermore, the driving method also includes a compensation operation performed on the data line to be compensated in the display panel after the jump waveform is obtained, that is, determining the jump gate line according to the jump waveform and the scanning timing of the gate line; determining the polarity and amplitude of the jump voltage according to the jump waveform; determining the data line to be compensated according to the image information; determining the compensation voltage according to the polarity and amplitude of the jump voltage, the jump gate line and the data line to be compensated; and compensating the data line to be compensated according to the compensation voltage.

[0053] The present disclosure realizes the acquisition and resetting of the sensing line through the first switch and the second switch, and can perform more accurate compensation value calculation based on the acquired jump waveform, thereby avoiding the crosstalk problem that occurs in the display panel during the display process, and making the display panel have a better display effect.

[0054] A third embodiment of the present disclosure provides an electronic device, which includes at least the display panel provided by the first embodiment of the present disclosure. The sensing line added to the display panel can collect the jump conditions on the gate line. The collection and reset of the sensing line are achieved through a first switch and a second switch. The collected jump waveform can be used to calculate a more accurate compensation value, thereby avoiding the crosstalk problem that occurs in the display panel during the display process, and making the display panel have a better display effect.

[0055] The above describes in detail multiple embodiments of the present disclosure, but the present disclosure is not limited to these specific embodiments. Those skilled in the art can make various variations and modifications to the embodiments based on the concepts of the present disclosure, and these variations and modifications should all fall within the scope of protection claimed by the present disclosure.

Claims

1. A display panel, characterized in that: At least: a plurality of data lines extending along a first direction, all of the data lines being sequentially arranged along a second direction, adjacent data lines being insulated from each other, and the first direction and the second direction being perpendicular to the display surface of the display panel; a plurality of gate lines extending along the second direction, all of the gate lines being sequentially arranged along the first direction, adjacent gate lines being insulated from each other, and a first insulating layer being provided between the data lines and the gate lines; at least one sensing line, the sensing line being arranged parallel to the data line, and having a second insulating layer between the sensing line and the gate line, so that an orthographic projection of each sensing line on the display surface has an overlapping area with the orthographic projections of all gate lines on the display surface; The sensing line is connected to a collection unit under the control of a first switch, and the collection unit is used to collect the jump waveform of the gate line in the current display frame sensed by the sensing line; the sensing line is reset under the control of a second switch; Also includes: a compensation unit, wherein the compensation unit determines a compensation voltage according to the jump waveform and image information of a current display frame, so as to compensate the data line; The compensation unit is specifically used to determine the jumping gate line according to the jumping waveform and the scanning timing of the gate line; determine the polarity and amplitude of the jumping voltage according to the jumping waveform; determine the data line to be compensated according to the image information; determine the compensation voltage according to the polarity and amplitude of the jumping voltage, the jumping gate line and the data line to be compensated; and compensate the data line to be compensated according to the compensation voltage.

2. The display panel according to claim 1, wherein: The first switch is turned on during the charging phase of the pixel and is turned off during the light emitting phase of the pixel; The second switch is disconnected during the charging phase of the pixel and is turned on during the light emitting phase of the pixel.

3. The display panel according to claim 1, wherein: The sensing line and the data line are arranged in the same layer.

4. The display panel according to claim 1, wherein: The first switch and the second switch are both multiplex switches.

5. The display panel according to any one of claims 1 to 4, characterized in that: The display panel is an organic light-emitting semiconductor panel.

6. A method for driving a display panel according to any one of claims 1 to 5, characterized in that: include: Turning on the first switch and turning off the second switch, so that the acquisition unit acquires the transition waveform on the gate line sensed by the sensing line; Turning off the first switch and turning on the second switch, resetting the sensing line through a reset signal; After the acquisition unit acquires the transition waveform on the gate line sensed on the sensing line, the method further includes: Determining the gate line to be jumped according to the jump waveform and the scanning timing of the gate line; determining the polarity and amplitude of the jump voltage according to the jump waveform; and determining the data line to be compensated according to the image information; determining a compensation voltage according to the polarity and amplitude of the jump voltage, the jump gate line, and the data line to be compensated; The data line to be compensated is compensated according to the compensation voltage.

7. An electronic device, characterized in that: The electronic device includes at least the display panel according to any one of claims 1 to 4.

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