Display panel and display device

Abstract

The application provides a display panel and a display device, wherein the display panel comprises a compensation circuit, an array substrate, a common electrode layer and a feedback trace layer arranged in a thickness direction of the display panel and spaced from the common electrode layer, the common electrode layer and the feedback trace layer are arranged on the array substrate; the display panel further comprises a display area and a GDL area; the common electrode layer comprises a common electrode line, the common electrode line is used for providing a common voltage signal to a pixel in the display area of the display panel; the feedback trace layer comprises a common electrode feedback line, in the thickness direction of the display panel, the common electrode feedback line is arranged opposite and spaced from the common electrode line; the common electrode feedback line senses voltage fluctuation of the common electrode line based on a parasitic capacitance, the common electrode feedback line is electrically connected with the compensation circuit, and the compensation circuit is used for compensating the common voltage signal according to the voltage fluctuation. The technical scheme provided by the application can improve the display quality of the display panel.

Description

Technical Field

[0001] This application relates to the field of display technology, and more particularly to a display panel and display device. Background Technology

[0002] With the widespread application of thin film transistor liquid crystal display (TFT-LCD) devices in televisions, mobile phones, and laptops, people have placed higher demands on the display quality of LCD devices. High resolution, high color gamut, fast response speed, wide viewing angle, and stable image are all research and development directions and key points for new technologies and products.

[0003] In Gate Driver Less (GDL) areas, common electrode lines, common electrode feedback lines, and other traces are typically arranged on the same layer and made of the same material. As users demand narrower bezels for display devices, the width of the GDL area is becoming increasingly narrower, and the coupling between adjacent traces is becoming more severe. The interference of signals from adjacent traces on the horizontal plane on the common electrode feedback line signal is also aggravated. The common electrode feedback line is used to sense (or monitor) voltage fluctuations in the common electrode line and transmit them to the compensation circuit. When the input signal is abnormal, the compensation circuit's compensation function for the common electrode line fails, thus affecting display quality. Summary of the Invention

[0004] In view of this, this application provides a display panel and display device for improving display quality.

[0005] To achieve the above objectives, in a first aspect, embodiments of this application provide a display panel, including: a compensation circuit, an array substrate, a common electrode layer, and a feedback trace layer disposed at a distance from the common electrode layer in the thickness direction of the display panel, wherein the common electrode layer and the feedback trace layer are disposed on the array substrate; the display panel further includes a display area and a GDL area, wherein the GDL area is located on opposite sides of the display area;

[0006] The common electrode layer includes common electrode lines, which are used to provide a common voltage signal to the pixels in the display area of ​​the display panel;

[0007] The feedback trace layer includes a common electrode feedback line. In the thickness direction of the display panel, the common electrode feedback line is positioned opposite and spaced apart from the common electrode line. In the display area and the GDL area, the relative area between the common electrode line and the common electrode feedback line is at least half the area of ​​the common electrode feedback line. The common electrode feedback line senses voltage fluctuations of the common electrode line based on parasitic capacitance. The common electrode feedback line is electrically connected to the compensation circuit, which is used to compensate the common voltage signal according to the voltage fluctuations.

[0008] In one possible implementation of the first aspect, in the display area: there are at least three common electrode feedback lines, and the multiple common electrode feedback lines are arranged at intervals along a first direction and extend along a second direction; the first direction is perpendicular to the second direction, and the second direction is parallel to the arrangement direction of the display area and the GDL area.

[0009] In one possible implementation of the first aspect, in the GDL region: the orthogonal projections of at least three common electrode feedback lines on the array substrate are respectively located within the orthogonal projections of at least three common electrode lines on the array substrate.

[0010] In one possible implementation of the first aspect, the common electrode feedback line includes a first feedback line segment and a second feedback line segment; the GDL area is provided with a first feedback line segment, and the orthographic projection of the first feedback line segment on the array substrate is located within the orthographic projection of the common electrode line on the array substrate; the display area is provided with a plurality of second feedback line segments arranged at intervals along a first direction and extending along a second direction.

[0011] The display panel also includes multiple scan lines and multiple switching transistors; the multiple scan lines are arranged at intervals along a first direction and extend along a second direction; the first end of all the switching transistors is connected to the first feedback line segment, the second end of each switching transistor is connected to the second feedback line segment in a one-to-one correspondence, and the control end of each switching transistor is connected to the scan line closest to it.

[0012] In one possible implementation of the first aspect, the common voltage is compensated based on the average sensing result of at least three common electrode feedback lines; or, the common electrode layer at the corresponding position is compensated based on the individual sensing results of at least three common electrode feedback lines.

[0013] In one possible implementation of the first aspect, the display panel further includes a touch layer, the touch layer including a sensing electrode layer and an emitting electrode layer, the feedback trace layer multiplexing at least one of the sensing electrode layer and the emitting electrode layer; the operating period of the display panel includes a touch period and a display period, in which the feedback trace layer is used to sense voltage fluctuations of the common electrode layer, and in which the feedback trace layer is used to perform touch functions during the display period.

[0014] In one possible implementation of the first aspect, the feedback trace layer reuses the emitting electrode layer; the display panel further includes a color filter substrate disposed opposite to the array substrate, the common electrode layer and the emitting electrode layer are sequentially disposed on the side of the array substrate facing the color filter substrate, and the sensing electrode layer is disposed on the color filter substrate; the emitting electrode layer includes a plurality of emitting electrodes spaced apart along a first direction and extending along a second direction, and the plurality of common electrode feedback lines reuse at least a plurality of the emitting electrodes; the sensing electrode layer includes a plurality of sensing electrodes spaced apart along the second direction and extending along the first direction.

[0015] In one possible implementation of the first aspect, each of the sensing electrodes is multiplexed by the common electrode feedback line.

[0016] The display panel provided in this application includes: a compensation circuit, an array substrate, a common electrode layer, and a feedback trace layer spaced apart from the common electrode layer in the thickness direction of the display panel. The common electrode layer and the feedback trace layer are disposed on the array substrate. The display panel also includes a display area and a GDL area, with the GDL areas located on opposite sides of the display area. The common electrode layer includes common electrode lines, which are used to provide a common voltage signal to the pixels in the display area of ​​the display panel. The feedback trace layer includes common electrode feedback lines, which are positioned opposite to and spaced apart from the common electrode lines in the thickness direction of the display panel. In the display area and the GDL area, the relative area between the common electrode lines and the common electrode feedback lines is at least half the area of ​​the common electrode feedback lines. The common electrode feedback lines sense voltage fluctuations in the common electrode lines based on parasitic capacitance. The common electrode feedback lines are electrically connected to the compensation circuit, which is used to compensate for the common voltage signal based on the voltage fluctuations. Through the above implementation method, the common electrode feedback line can sense the common voltage signal through parasitic capacitance, while also reducing the influence of adjacent signal lines on the sensing result of the common electrode feedback line. This improves the compensation accuracy of the compensation circuit for the common voltage signal, thereby improving the display quality.

[0017] Secondly, embodiments of this application provide a display device, including: a display panel as described in the first aspect or any possible implementation of the first aspect, and a backlight module disposed opposite to the display panel, the backlight module being used to provide backlight to the display panel.

[0018] It is understandable that the beneficial effects of the second aspect mentioned above can be found in the relevant descriptions in the first aspect mentioned above, and will not be repeated here. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the voltage feedback signal under ideal and actual conditions;

[0020] Figure 2 A top view of the common electrode feedback line and the common electrode line provided in the embodiments of this application;

[0021] Figure 3 for Figure 2 A cross-sectional view along section line A-A';

[0022] Figure 4 This is a schematic diagram showing the location of the common electrode feedback line within the display area provided in an embodiment of this application;

[0023] Figure 5 A top view schematic diagram of a common electrode feedback line provided in an embodiment of this application;

[0024] Figure 6 This is a schematic diagram of a structure in which the common electrode feedback line is multiplexed as a transmitting electrode according to an embodiment of this application.

[0025] Figure 7 for Figure 6 A cross-sectional view of the provided display area along section line B-B';

[0026] Figure 8 A schematic diagram of a structure in which a common electrode feedback line is multiplexed as a sensing electrode and a common electrode line is multiplexed as a transmitting electrode in an embodiment of this application;

[0027] Figure 9 for Figure 8 A cross-sectional view of the provided display area along section line E-E';

[0028] Figure 10 A comparison diagram of the sensing results of the prior art and the present solution provided in the embodiments of this application;

[0029] Figure 11 This is a schematic diagram of the structure of the display device provided in the embodiments of this application.

[0030] Explanation of reference numerals in the attached figures:

[0031] 100 - Display panel; 101 - Display area; 102 - GDL area;

[0032] 110 - Common electrode layer; 111 - Common electrode line; 120 - Feedback trace layer; 121 - Common electrode feedback line; 1211 - First feedback line segment; 1212 - Second feedback line segment; 130 - Compensation circuit;

[0033] 140 - Array substrate; 150 - Switch; 160 - Touch layer; 161 - Sensing electrode layer; 162 - Emitting electrode layer;

[0034] 170-Color filter substrate;

[0035] 200-Backlight Module. Detailed Implementation

[0036] The embodiments of this application are described below with reference to the accompanying drawings. The terminology used in the implementation section of this application is only for explaining specific embodiments and is not intended to limit the application. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0037] TFT display panels (hereinafter referred to as display panels) are matrix-type active driven devices. The GDL area contains various traces, including periodic signal lines, gate lines, and common electrode lines (Vcom Line), to transmit various signals required for displaying the image. The periodic signal lines may include, but are not limited to, clock signal lines, frame start signal lines, and power supply voltage signal lines. The signal lines are made of metal and separated by an inorganic insulating film layer for insulation. The double metal layers and the intermediate inorganic insulating film layer constitute parasitic capacitances (including overlapping capacitance and lateral capacitance). These parasitic capacitances can cause voltage signals on different metal lines to couple, thus deviating from the set values.

[0038] Ideally, the sensing result of the common electrode feedback line (Vcom Feedback Line) resembles a square wave signal. (See [reference]) Figure 1 (a). However, in existing in-plane designs, the common electrode line, periodic signal line, and common electrode feedback line are usually arranged on the same layer. The sensing results of the common electrode feedback line can be affected by the interference of the traces on the same layer, resulting in result deviation. See [reference needed]. Figure 1 (b) This will affect the input of the compensation circuit, causing the compensation circuit to lose accuracy in compensating for the common voltage signal, resulting in technical problems such as Excel crosstalk, text crosstalk, and screen flickering due to common voltage fluctuations.

[0039] In view of this, embodiments of this application provide a display panel, which may include a compensation circuit, an array substrate, a common electrode layer, and a feedback trace layer disposed at a distance from the common electrode layer in the thickness direction of the display panel. The common electrode layer and the feedback trace layer are disposed on the array substrate. The display panel also includes a display area and a GDL area, with the GDL areas located on opposite sides of the display area. The common electrode layer includes common electrode lines for providing a common voltage signal to pixels in the display area of ​​the display panel. The feedback trace layer includes common electrode feedback lines, which are disposed at a distance from the common electrode lines in the thickness direction of the display panel. In the display area and the GDL area, the relative area (or facing area) between the common electrode lines and the common electrode feedback lines is at least half the area of ​​the common electrode feedback lines. The common electrode feedback lines sense voltage fluctuations in the common electrode lines based on parasitic capacitance. The common electrode feedback lines are electrically connected to the compensation circuit, which can compensate for the common voltage signal according to voltage fluctuations.

[0040] The embodiments of this application are described below with reference to the accompanying drawings.

[0041] Figure 2 This is a top view of the common electrode feedback line and the common electrode line provided in the embodiments of this application. Figure 3 for Figure 2 A schematic diagram of a cross-section along section line A-A'. (See diagram below.) Figure 2 and Figure 3 As shown, the display panel 100 may include a display area 101 and a GDL area 102. The GDL area 102 may be located on opposite sides of the display area 101. In this embodiment, the GDL area 102 is located on the left and right sides of the display area 101.

[0042] See Figure 2 and Figure 3 In the thickness direction of the display panel 100 (the Z direction in the figure, where the X and Y directions are perpendicular to each other), the display panel 100 may further include a common electrode layer 110 and a feedback routing layer 120. The feedback routing layer 120 may be spaced apart from the common electrode layer 110 to reduce the number of traces in the same layer, reduce the impact of other traces in the same layer on the feedback routing layer 120, and improve the reliability of the display panel 100. Both the common electrode layer 110 and the feedback routing layer 120 may be formed on the array substrate 140 to reduce the fabrication difficulty.

[0043] The common electrode layer 110 may include common electrode lines 111. In some embodiments, the common electrode lines 111 may be configured as a mesh structure, which can enhance the bending resistance and heat dissipation of the common electrode layer 110, and also improve anti-interference capability. The feedback trace layer 120 may include common electrode feedback lines 121, and the common electrode lines 111 and 121 may be arranged opposite to each other and spaced apart. The common electrode lines 111 can provide a common voltage signal to the pixels in the display area 101, and the common electrode feedback lines 121 can sense voltage fluctuations in the common electrode lines 111 based on the parasitic capacitance between the common electrode feedback lines 121 and 111.

[0044] In this embodiment, the common electrode line 111 and the common electrode feedback line 121 are arranged opposite to each other along the Z direction and spaced apart to form a parasitic capacitance. This allows fluctuations in the common voltage signal to be coupled to the common electrode feedback line 121 through the parasitic capacitance. Furthermore, the relative arrangement increases the relative area of ​​the common electrode line 111 and the common electrode feedback line 121, thereby increasing the capacitance value of the parasitic capacitance. This allows the common electrode feedback line 121 to more accurately sense voltage fluctuations (or distortions) in the common voltage signal and reduces interference from other signal lines to the common electrode feedback line 121, thus improving the correlation between the sensing result and the common voltage signal, and consequently improving the sensing accuracy.

[0045] The common electrode feedback line 121 can be electrically connected to the compensation circuit 130, which can compensate for the common voltage signal based on the voltage fluctuation transmitted through the common electrode feedback line 121. In some embodiments, the compensation circuit 130 can be an operational amplifier integrated circuit. The input terminal of each common electrode feedback line 121 can be grounded, and the output terminal can be electrically connected to the input terminal of the operational amplifier integrated circuit. This reduces the influence of adjacent signal lines on the sensing results, facilitating the operational amplifier integrated circuit to compensate for the common voltage signal.

[0046] In some other embodiments, the input terminal of the common electrode feedback line 121 can also be connected to the ground terminal of the operational amplifier integrated circuit to simplify the circuit structure. The operational amplifier integrated circuit can be placed at any position on the display panel 100. For example, the operational amplifier integrated circuit can be integrated on a printed circuit board (PCB). The common electrode feedback line 121 can be directly connected to the operational amplifier integrated circuit on the PCB after passing through a flip-chip film. This not only achieves circuit integration and miniaturization, but also reduces contact coupling with other traces, ensuring the accuracy and stability of signal transmission.

[0047] For example, a common compensation signal line electrically connected to the compensation circuit 130 can also be provided within the display panel 100. The compensation circuit 130 can compensate for the common voltage signal within the display area 101 through the common compensation signal line to maintain the common voltage required for normal display. For example, when the waveform of the common voltage signal fluctuates upward relative to the voltage balance point of the common voltage signal, the compensation circuit 130 can use reverse amplification compensation to pull the common voltage signal back to the balance point, thereby reducing the occurrence of Excel crosstalk, text crosstalk, and screen flickering due to common voltage fluctuations. The common compensation signal line can be electrically connected to the common electrode layer 110 of the GDL area 102, that is, the common electrode layer 110 of the GDL area 102 serves as the signal input structure of the common electrode layer 110 of the display area 101.

[0048] In order to improve the sensing accuracy of the common electrode feedback line 121 in sensing the common voltage signal, in some embodiments, the relative area of ​​the common electrode line 111 and the opposite common electrode feedback line 121 in the display area 101 and GDL area 102 can be at least greater than half the area of ​​the common electrode feedback line 121, so as to further increase the sensing area and improve the sensing accuracy.

[0049] In one alternative implementation, multiple common electrode feedback lines 121 can be configured in the display area 101, such as... Figure 2 As shown, at least three lines can be configured. The common electrode feedback line 121 may include FB1, FB2 and FB3, which are located at different positions in the display area 101, thereby increasing the area of ​​the sensing area.

[0050] In display area 101, see Figure 2 and Figure 4 Multiple common electrode feedback lines 121 can be arranged at intervals along a first direction (X direction in the figure) and can extend along a second direction (Y direction in the figure). The first direction can be perpendicular to the second direction, and the second direction can be parallel to the arrangement direction of the display area 101 and the GDL area 102.

[0051] The common electrode layer 110 may include multiple common electrode lines 111, for example Figure 2Vcom1, Vcom2, and Vcom3 are defined in the image. By setting at least three common electrode feedback lines 121 (FB1, FB2, and FB3) corresponding one-to-one with the common electrode line 111, the common electrode feedback lines 121 can sense voltage fluctuations of the common electrode line 111 at different locations (including display area 101 and GDL area 102). For example, if FB1 senses the voltage fluctuation of the corresponding Vcom1, the sensing result can be transmitted to the compensation circuit 130. The compensation circuit 130 can compensate for the common voltage of Vcom1 based on the sensing result to offset voltage distortion, thereby improving the sensing reliability of the common electrode feedback lines 121 and realizing the zonal compensation of the common electrode layer 110. The common electrode line 111 extends in the same direction as the corresponding common electrode feedback line 121, which can also increase the relative area between the common electrode feedback line 121 and the corresponding common electrode line, improving the sensing accuracy.

[0052] Understandably, in Figure 2 The position of the common electrode line 111 in the display area shown is merely illustrative. In different embodiments, the position of the common electrode line 111 is not fixed and can be arranged in other different locations according to specific design requirements. Furthermore, its orientation is not limited to the example shown and can be flexibly adjusted according to actual conditions, ensuring that the area directly opposite the common electrode line 111 and the corresponding common electrode feedback line 121 is greater than half to ensure the stability and reliability of the sensing. For example, in certain specific scenarios (such as those requiring high light transmittance or uniform electric field distribution), to meet special performance requirements or design concepts, the common electrode line 111 can also be configured as a mesh structure, achieving a more optimized display effect through a fine mesh layout.

[0053] In some embodiments, multiple common electrode feedback lines 121 can be electrically connected to the input of the same compensation circuit 130. This simplifies the wiring, avoids congestion caused by multiple compensation circuits 130, and helps reduce the area of ​​the GDL region 102. Furthermore, compared to multiple compensation circuits 130 working together, connecting multiple common electrode feedback lines 121 to the same compensation circuit 130 reduces data processing difficulty, lowers manufacturing costs, and improves the stability of the common voltage signal.

[0054] In the above-described implementation, when compensating for the common voltage signal, the compensation circuit 130 can compensate the common electrode line 111 corresponding to each of the connected common electrode feedback lines 121 according to their respective sensing results. This allows for zoned compensation of the common voltage signal, effectively balancing compensation accuracy and complexity, thereby improving display quality. Furthermore, by employing a redundant design with at least three common electrode feedback lines 121 at different locations, this application ensures that even if one common electrode feedback line 121 fails, the compensation circuit 130 can still maintain its basic functions by relying on other common electrode feedback lines 121, thus enhancing the reliability of the display panel 100.

[0055] Continue reading Figure 2 and Figure 3 In the GDL region 102, the orthographic projections of at least three common electrode feedback lines 121 on the array substrate can be located within the orthographic projections of at least three common electrode lines 111 on the array substrate. This facilitates the fabrication of the common electrode feedback lines 121, reduces interference from other signal lines to the common electrode feedback lines 121, and increases the sensing area of ​​the common electrode feedback lines 121, thereby improving the sensing accuracy.

[0056] In some embodiments, the multiple common electrode lines 111 may be arranged in a partitioned manner in the X direction. For example, see [reference needed]. Figure 2 The three common electrode lines 111 can be arranged along the X-direction in the upper (e.g., upper 1 / 3), middle (middle 1 / 3), and lower (lower 1 / 3) parts of the display panel 100. Correspondingly, the common electrode feedback line 121 can also be arranged in different areas of the display panel 100. In the X-direction, the three common electrode lines 111 can be arranged at equal intervals, which facilitates co-layer fabrication and reduces process complexity.

[0057] Optionally, in the display area 101, the common electrode layer 110 may also include multiple electrode layer partitions, such as a top electrode layer partition, a middle electrode layer partition, and a lower electrode layer partition, correspondingly connected to the common electrode lines 111 located in the upper, middle, and lower parts. This can reduce and avoid resistance-capacitance delay caused by long-distance traces. The three common electrode lines 111 provide power to different electrode layer partitions in a partitioned manner, thereby reducing the voltage drop caused by the increase in the size of the display panel. Furthermore, this allows the compensation circuit 130 to dynamically compensate for voltage fluctuations in different partitions based on the sensing results of different partitions, improving the voltage consistency of the top electrode layer partition, the middle electrode layer partition, and the lower electrode layer partition, thereby improving display quality.

[0058] In another alternative implementation, see [link to relevant documentation]. Figure 5The common electrode feedback line 121 may include a first feedback line segment 1211 and a second feedback line segment 1212, and the number of second feedback line segments 1212 may be multiple. The GDL region 102 may have one first feedback line segment 1211, and the orthographic projection of the first feedback line segment 1211 on the array substrate 140 may lie within the orthographic projection of the common electrode line 111 on the array substrate, so that the first feedback line segment 1211 is directly opposite to the common electrode line 111 in the GDL region 102. The display area 101 may have multiple second feedback line segments 1212 arranged at intervals along a first direction and extending along a second direction to increase the sensing area.

[0059] The display panel 100 may also include multiple scan lines (not shown) and multiple switching transistors 150, each of which may correspond one-to-one with a second feedback line segment 1212. The multiple scan lines may be arranged at intervals along a first direction and extend along a second direction.

[0060] The switching transistor 150 can be a metal-oxide-semiconductor (MOS) field-effect transistor or a bipolar junction transistor (BJT), etc. For ease of understanding, the following explanation will use an NMOS transistor as an example.

[0061] For each switching transistor 150, the first terminal (or drain) can be connected to the first feedback segment 1211, the second terminal (or source) can be connected to the second feedback segment 1212 in a one-to-one correspondence, and the control terminal can be electrically connected to the scan line closest to it.

[0062] Taking the switch 150 as an N-channel metal-oxide-semiconductor (NMOS) field-effect transistor as an example, it has the characteristics of being turned on at a high level and turned off at a low level. For example, in the embodiment of this application, when a high level is applied to the scan line connected to the switch T1, the switch T1 can be turned on under the action of the high level, so that the source and drain of the switch T1 can be connected in series on the common electrode feedback line 121.

[0063] Through the above implementation, the on / off state of each switch transistor 150 can be controlled using the scan line progressive scan mode. This allows for the sensing of voltage fluctuations in the common voltage signal of different areas of the display panel 100, and reduces interference between adjacent common electrode feedback lines 121 during the conduction time of the switch transistors 150, thereby improving the sensing reliability of the common electrode feedback lines 121. Furthermore, this effectively reduces the number of common electrode feedback lines 121 in the GDL area 102, simplifies the circuitry, and reduces interference from other signal traces.

[0064] In the above implementation, when compensating for the common voltage signal, the compensation circuit 130 can generate a globally balanced control signal, such as a weighted average, based on the sensing results of the common electrode line feedback line using an algorithm. This allows for compensation of the common voltage based on the average sensing results of the common electrode line feedback line, reducing the difficulty of compensation. Furthermore, since a single common electrode feedback line 121 can only sense voltage fluctuations in a local common electrode line 111, distributing multiple second feedback line segments 1212 at different locations and generating an average sensing result based on the sensing results of the common electrode feedback line 121 can avoid errors caused by "the local representing the whole."

[0065] The common electrode line 111 and the common electrode feedback line 121 can be made of copper or transparent conductive materials, such as indium tin oxide (ITO). Since ITO has high light transmittance and stable chemical properties, it can improve the light transmittance and reliability of the display panel 100.

[0066] Understandable Figures 3-5 The feedback trace layer 120 can be located above the common electrode layer 110. In some embodiments, the feedback trace layer 120 can also be located below the common electrode layer 110. The number of common electrode lines 111 and common electrode feedback lines 121 can be set according to actual needs.

[0067] The display panel 100 can be a touch display panel. In one alternative implementation, see [reference needed]. Figure 6 and Figure 7 The display panel 100 may further include a touch layer 160, which may include a sensing electrode layer 161 and a transmitting electrode layer 162. The feedback routing layer 120 may reuse at least one of the sensing electrode layer 161 and the transmitting electrode layer 162. The operating period of the display panel 100 may include a touch period (or a data blank period) and a display period. During the touch period, the feedback routing layer 120 may be used to sense voltage fluctuations in the common electrode layer 110. During the display period, the feedback routing layer 120 may be used to perform touch functions.

[0068] For ease of understanding, the following example illustrates the use of feedback routing layer 120 multiplexing emitter electrode layer 162.

[0069] The common electrode feedback line 121 can reuse part of the emitter electrode Tx of the emitter electrode layer 162, or it can reuse each emitter electrode Tx of the emitter electrode layer 162 to increase the sensing area.

[0070] Continue reading Figure 6 and Figure 7The display panel 100 may also include a color filter substrate 170 disposed opposite to the array substrate 140. A common electrode layer 110 (not shown) and an emission electrode layer 162 may be disposed sequentially on the side of the array substrate 140 facing the color filter substrate 170. A sensing electrode layer 161 may be disposed on the color filter substrate 170.

[0071] The emitting electrode layer 162 may include multiple emitting electrodes Tx spaced apart along a first direction and extending along a second direction, and multiple common electrode feedback lines 121 may reuse at least one of the emitting electrodes Tx. The sensing electrode layer 161 includes multiple sensing electrodes Rx spaced apart along the second direction and extending along the first direction. The common electrode lines 111 may be connected into a mesh structure, which can not only reduce the manufacturing cost but also improve the anti-interference capability. In the extension direction of the emitting electrodes Tx, the emitting electrodes Tx are arranged opposite to the common electrode lines 111 extending along the Y direction, thereby increasing the relative area.

[0072] During the display period, the common electrode feedback line 121 can sense the voltage fluctuation of the common electrode line 111 as the input signal of the compensation circuit 130, and then compensate the display panel 100 by means of reverse amplification compensation of the compensation circuit 130.

[0073] During the touch period, the common electrode feedback line 121 can be reused as the transmitting electrode Tx. The transmitting electrode Tx can be loaded with a touch signal, and a mutual capacitance C can be formed between the common electrode feedback line 121 and the sensing electrode Rx. When the user touches the screen, the mutual capacitance C can change. The sensing electrode Rx can receive the change in mutual capacitance C (referred to as the touch sensing signal) and output the touch sensing signal to the touch detection circuit (not shown) through the sensing electrode Rx. The touch detection circuit can determine the touch position based on the touch sensing signal.

[0074] Touch detection circuits can be integrated onto a flip-chip film to simplify the structure while protecting the touch detection circuit and reducing the risk of damage.

[0075] Figure 7 The following description uses the example of the sensing electrode layer 161 being disposed on the lower surface of the color filter substrate 170. It is understood that the sensing electrode layer 161 can also be disposed on the upper surface of the color filter substrate 170, and this embodiment does not impose any particular limitation on this.

[0076] In some embodiments, the feedback trace layer 120 can be reused as a sensing electrode layer 161, and the common electrode layer 110 can be reused as a transmitting electrode layer 162. The transmitting electrode layer 162 may include multiple transmitting electrodes Tx arranged at intervals along a first direction and extending along a second direction, and the multiple common electrode lines 111 may each reuse at least multiple transmitting electrodes Tx. The sensing electrode layer 161 may include multiple sensing electrodes Rx arranged at intervals along the second direction and extending along the first direction, and the multiple common electrode feedback lines 121 may each reuse at least multiple sensing electrodes Rx.

[0077] For example, see Figure 8 and Figure 9 During the display period, a common voltage signal is applied to the transmitting electrode Tx. The sensing electrode Rx can sense the voltage fluctuations of the common voltage signal and transmit the sensing result to the compensation circuit 130 as its input signal. The compensation circuit 130 can perform reverse compensation on the common voltage signal through reverse amplification compensation.

[0078] During the touch period, when the user touches the screen, the capacitance C between the sensing electrode Rx and the common electrode line 111 changes. The sensing electrode Rx can receive the touch sensing signal generated by the change in capacitance C, so that the touch detection circuit can determine the touch position based on the touch sensing signal.

[0079] This application embodiment designs the common electrode feedback line 121 and / or common electrode line 111 in the display panel 100 as time-division multiplexing, which allows the same physical trace to perform different functions at different times, thereby reducing the number of electrode layers, simplifying the stacking structure, optimizing space utilization, and reducing manufacturing costs.

[0080] The common electrode feedback line 121 can reuse a portion of the sensing electrodes Rx from the sensing electrode layer 161. Therefore, by controlling the number of reused sensing electrodes Rx, overall power consumption can be reduced while meeting performance requirements. The number of reused sensing electrodes Rx can be set according to actual needs to adapt to different circuit designs and performance requirements. Of course,

[0081] The common electrode feedback line 121 can also reuse each sensing electrode Rx of the sensing electrode layer 161, thereby making full use of the sensing electrode layer 161, avoiding resource waste, and improving the overall integration of the circuit.

[0082] Optionally, the feedback trace layer 120 may include multiple layers in the thickness direction of the display panel 100, with each feedback trace layer 120 spaced apart. For example, the feedback trace layer 120 may include two layers, with a common electrode layer 110 located between the two feedback trace layers 120. By providing feedback trace layers 120 both above and below the common electrode layer 110, the compensation circuit 130 can compensate for the common voltage signal based on the sensing results of the upper and lower feedback trace layers 120, thereby improving the accuracy of the compensation. In some embodiments, the number and position of the feedback trace layers 120 can be set according to actual needs. For example, three feedback trace layers 120 may also be provided, with the three layers respectively located at the upper, middle, and lower parts of the display panel 100. This application embodiment does not impose any particular limitation on this.

[0083] Figure 10 A comparison diagram of the sensing results of the prior art and the present solution provided in this application embodiment. (See also...) Figure 10 FB test1 represents the waveform curve when the common electrode feedback line is set on the same layer as other traces in the prior art, and FB test2 represents the waveform curve when the common electrode feedback line is set on the same layer as other traces in the embodiment of this application. Obviously, the sensing result waveform in the embodiment of this application is smoother and basically free of glitches and noise, which further proves the reliability of the solution described in the embodiment of this application.

[0084] This application provides a display panel, including: a compensation circuit, an array substrate, a common electrode layer, and a feedback trace layer spaced apart from the common electrode layer in the thickness direction of the display panel. The common electrode layer and the feedback trace layer are disposed on the array substrate. The display panel also includes a display area and a GDL area, with the GDL areas located on opposite sides of the display area. The common electrode layer includes common electrode lines for providing a common voltage signal to pixels in the display area of ​​the display panel. The feedback trace layer includes common electrode feedback lines, which are spaced apart from the common electrode lines in the thickness direction of the display panel. In the display area and the GDL area, the relative area between the common electrode lines and the common electrode feedback lines is at least half the area of ​​the common electrode feedback lines. The common electrode feedback lines sense voltage fluctuations in the common electrode lines based on parasitic capacitance. The common electrode feedback lines are electrically connected to the compensation circuit, which compensates for the common voltage signal based on the voltage fluctuations. By setting the common electrode line and the common electrode feedback line to be on different layers, the number of traces on the same layer in the GDL area can be reduced. This allows for monitoring of the common voltage signal of the common electrode line while reducing interference from other traces to the common electrode feedback line. Consequently, the correlation between the sensing results transmitted to the compensation circuit and the common voltage signal can be improved, thereby increasing the compensation accuracy of the compensation circuit for the common voltage signal and ultimately improving the display quality.

[0085] Based on the same inventive concept, embodiments of this application also provide a display device. Figure 11 This is a schematic diagram of a display device provided in an embodiment of this application, such as... Figure 11 As shown, the display device may include a backlight module 200 and a display panel 100 as described in any of the above embodiments. The backlight module 200 is disposed opposite to the display panel 100 and is used to provide backlight to the display panel 100.

[0086] Since the display device in this embodiment includes the display panel in the above embodiments, the display device in this embodiment has all the technical features and effects of the above-described display panel embodiments. For details, please refer to the above embodiments, and will not be repeated here.

[0087] It should be understood that in the description of this application and the appended claims, the terms "comprising," "including," "having," and any variations thereof are intended to cover non-exclusive inclusion and mean "including but not limited to," unless otherwise specifically emphasized.

[0088] In the description of this application, unless otherwise stated, " / " indicates that the objects before and after are in an "or" relationship. For example, A / B can mean A or B. "And / or" in this application is used to describe the relationship between the related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. A and B can be singular or plural.

[0089] Furthermore, in the description of this application, unless otherwise stated, "multiple" means two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items.

[0090] Furthermore, it should be understood in the description of this application that the terms "longitudinal," "horizontal," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0091] In this application, unless otherwise expressly specified and limited, the terms "connection" and "linkage" should be interpreted broadly. For example, they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise expressly limited, those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0092] Furthermore, in the description of this application and the appended claims, the terms "first," "second," etc., are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in a sequence other than that illustrated or described herein; features defined as "first" or "second" may explicitly or implicitly include at least one of those features.

[0093] In the embodiments of this application, the words "exemplarily" or "for example" are used to indicate examples, illustrations, or explanations. Any embodiment or design described as "exemplarily" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design solutions. Specifically, the use of the words "exemplarily" or "for example" is intended to present the relevant concepts in a specific manner.

[0094] References to "one embodiment" or "some embodiments" in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized.

[0095] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A display panel, characterized in that, include: The display panel includes a compensation circuit, an array substrate, a common electrode layer, and a feedback trace layer spaced apart from the common electrode layer in the thickness direction of the display panel. The common electrode layer and the feedback trace layer are disposed on the array substrate. The display panel also includes a display area and a GDL area, with the GDL area located on opposite sides of the display area. The common electrode layer includes common electrode lines, which are used to provide a common voltage signal to the pixels in the display area of ​​the display panel; The feedback trace layer includes a common electrode feedback line. In the thickness direction of the display panel, the common electrode feedback line is positioned opposite and spaced apart from the common electrode line to form a parasitic capacitance. In the display area and the GDL area, the relative area between the common electrode line and the common electrode feedback line is at least half the area of ​​the common electrode feedback line. The common electrode feedback line senses voltage fluctuations of the common electrode line based on parasitic capacitance. The common electrode feedback line is electrically connected to the compensation circuit, which compensates for the common voltage signal based on the voltage fluctuations. The input terminal of each common electrode feedback line is grounded, and its output terminal is electrically connected to the input terminal of an operational amplifier integrated circuit.

2. The display panel according to claim 1, characterized in that, In the display area: there are at least three common electrode feedback lines, and multiple common electrode feedback lines are arranged at intervals along a first direction and extend along a second direction; the first direction is perpendicular to the second direction, and the second direction is parallel to the arrangement direction of the display area and the GDL area.

3. The display panel according to claim 2, characterized in that, In the GDL region: the orthogonal projections of at least three common electrode feedback lines on the array substrate are respectively located within the orthogonal projections of the at least three common electrode lines on the array substrate.

4. The display panel according to claim 2, characterized in that, The common electrode feedback line includes a first feedback line segment and a second feedback line segment; the GDL area is provided with a first feedback line segment, and the orthographic projection of the first feedback line segment on the array substrate is located within the orthographic projection of the common electrode line on the array substrate; the display area is provided with multiple second feedback line segments arranged at intervals along a first direction and extending along a second direction. The display panel also includes multiple scan lines and multiple switching transistors; the multiple scan lines are arranged at intervals along a first direction and extend along a second direction; the first end of all the switching transistors is connected to the first feedback line segment, the second end of each switching transistor is connected to the second feedback line segment in a one-to-one correspondence, and the control end of each switching transistor is connected to the scan line closest to it.

5. The display panel according to claim 2, characterized in that, The common voltage is compensated based on the average sensing result of at least three common electrode feedback lines; or, the common electrode layer at the corresponding position is compensated based on the individual sensing results of at least three common electrode feedback lines.

6. The display panel according to claim 1, characterized in that, The display panel further includes a touch layer, which includes a sensing electrode layer and an emitting electrode layer. The feedback trace layer reuses at least one of the sensing electrode layer and the emitting electrode layer. The operating period of the display panel includes a touch period and a display period. During the touch period, the feedback trace layer is used to sense voltage fluctuations of the common electrode layer. During the display period, the feedback trace layer is used to perform touch functions.

7. The display panel according to claim 6, characterized in that, The feedback trace layer reuses the emission electrode layer; the display panel further includes a color filter substrate disposed opposite to the array substrate, the common electrode layer and the emission electrode layer are sequentially disposed on the side of the array substrate facing the color filter substrate, and the sensing electrode layer is disposed on the color filter substrate; the emission electrode layer includes a plurality of emission electrodes spaced apart along a first direction and extending along a second direction, and the plurality of common electrode feedback lines reuse at least a plurality of emission electrodes; the sensing electrode layer includes a plurality of sensing electrodes spaced apart along the second direction and extending along the first direction.

8. The display panel according to claim 6, characterized in that, The feedback trace layer reuses the sensing electrode layer, and the common electrode layer reuses the emitting electrode layer; the emitting electrode layer includes multiple emitting electrodes spaced apart along a first direction and extending along a second direction, and the multiple common electrode lines reuse at least multiple emitting electrodes respectively; the sensing electrode layer includes multiple sensing electrodes spaced apart along a second direction and extending along a first direction, and the multiple common electrode feedback lines reuse at least multiple sensing electrodes respectively.

9. The display panel according to claim 8, characterized in that, Each of the aforementioned sensing electrodes is multiplexed by the common electrode feedback line.

10. A display device, characterized in that, include: It includes a display panel as described in any one of claims 1-9 and a backlight module disposed opposite to the display panel, the backlight module being used to provide backlight to the display panel.

Images