Common voltage compensation device for display panel, display panel and display equipment

Abstract

This disclosure provides a common voltage compensation device for a display panel, a display panel, and a display device, belonging to the field of display technology. The common voltage compensation device is disposed on a first side of the display panel. The common electrode line of the display panel includes a near end, a far end, and a middle end region. The common voltage compensation device includes a voltage feedback line, a common voltage compensation circuit, and a voltage compensation line. One end of the voltage feedback line is connected to a feedback point in the middle end region, and the other end is connected to the common voltage compensation circuit for detecting the common voltage on the common electrode line. The common voltage compensation circuit is used to obtain a corresponding compensation voltage based on the detected common voltage. One end of the voltage compensation line is connected to the common voltage compensation circuit, and the other end is respectively connected to a first compensation point in the near end region, a second compensation point in the middle end region, and at least one third compensation point in the far end region of the common electrode line for transmitting the compensation voltage to the common electrode line to compensate for the common voltage.

Description

Technical Field

[0001] This disclosure belongs to the field of display technology, specifically relating to a common voltage compensation device for a display panel, a display panel, and a display device. Background Technology

[0002] Currently, Liquid Crystal Displays (LCDs) are increasingly widely used. LCDs utilize the voltage difference between a common electrode and pixel electrodes to drive the rotation of liquid crystal molecules, thereby displaying an image. However, in LCDs, coupling capacitance exists between the common electrode and various traces within the display, such as between the common electrode and data lines, or between the common electrode and gate lines. When the signal on the gate or data lines undergoes a sudden change—from high to low or vice versa—the voltage across the coupling capacitors changes abruptly. This causes fluctuations in the common voltage (VCOM) of the common electrode, making it difficult to maintain stability. Consequently, the voltage difference between the common electrode and pixel electrodes becomes abnormal, leading to problems such as image retention and crosstalk in the LCD, affecting display quality. Therefore, common voltage compensation is necessary.

[0003] In related technologies, the source-driven printed circuit board (X-PCB) is located on one side of the display panel. When compensating for the common voltage on the common electrode, a voltage feedback line is usually placed at a position far from the common electrode on the X-PCB (which can be called the far end) to detect the common voltage on the common electrode and perform compensation based on the detected common voltage. However, this compensation method has poor compensation effect. Summary of the Invention

[0004] This disclosure aims to at least solve one of the technical problems existing in the related art, and to provide a common voltage compensation device for a display panel, a display panel, and a display device.

[0005] In a first aspect, embodiments of this disclosure provide a common voltage compensation device for a display panel, the display panel including a first side and a second side opposite to each other along a column direction, the common voltage compensation device being disposed on the first side of the display panel.

[0006] The display panel further includes a common electrode line, which is arranged around the display area of ​​the display panel. The common electrode line includes a proximal region adjacent to the first side, a distal region adjacent to the second side, and a mid-range region between the proximal region and the distal region.

[0007] The common voltage compensation device includes a voltage feedback line, a common voltage compensation circuit, and a voltage compensation line.

[0008] One end of the voltage feedback line is connected to the feedback point in the middle region of the common electrode line, and the other end is connected to the common voltage compensation circuit, which is used to detect the common voltage on the common electrode line.

[0009] The common voltage compensation circuit is used to obtain a compensation voltage corresponding to the common voltage based on the common voltage detected by the voltage feedback line;

[0010] One end of the voltage compensation line is connected to the common voltage compensation circuit, and the other end is connected to a first compensation point in the near-end region, a second compensation point in the middle region, and at least one third compensation point in the far-end region of the common electrode line, respectively, for transmitting the compensation voltage to the common electrode line to compensate the common voltage.

[0011] In some embodiments, the display panel further includes a third side and a fourth side opposite each other in the row direction, the feedback point being located in the middle region adjacent to the third side; and the second compensation point being located in the middle region adjacent to the fourth side.

[0012] In some embodiments, the common voltage compensation circuit obtains a compensation voltage corresponding to the common voltage based on the common voltage detected by the voltage feedback line, including:

[0013] The coupling voltage is determined based on the common voltage detected by the voltage feedback line and the preset common voltage threshold.

[0014] Based on the compensation multiples of the first compensation point, the second compensation point, and the third compensation point, negative feedback processing is performed on the coupling voltage to obtain the compensation voltages of the first compensation point, the second compensation point, and the third compensation point, respectively.

[0015] In some embodiments, the compensation multiples of the first compensation point, the second compensation point, and the third compensation point may be the same or different.

[0016] In some embodiments, the voltage compensation line includes at least one first compensation line connected to the first compensation point, a second compensation line connected to the second compensation point, and a third compensation line connected to at least one of the third compensation points.

[0017] In some embodiments, the first compensation point is located in the middle of the proximal region; there are two third compensation points, located on both sides of the distal region, and connected to the corresponding third compensation lines respectively.

[0018] Secondly, embodiments of this disclosure provide a display panel that includes the aforementioned common voltage compensation device for the display panel.

[0019] In some embodiments, the display panel includes a display panel for PDFs that do not have image quality detection functionality.

[0020] In some embodiments, the display panel includes a vertical display panel based on COG technology, and the size of the display panel is greater than or equal to a preset size threshold.

[0021] Thirdly, embodiments of this disclosure provide a display device, the display device including the display panel described above. Attached Figure Description

[0022] Figure 1a and Figure 1b A schematic diagram illustrating the principle behind the greenish tint of the image.

[0023] Figure 2 This is a schematic diagram illustrating the common voltage feedback and compensation for display panels in related technologies.

[0024] Figure 3 This is a schematic diagram of the common voltage feedback and compensation of the display panel according to an embodiment of the present disclosure.

[0025] Figure 4 This is a schematic diagram of the test results for common voltage compensation according to an embodiment of this disclosure. Detailed Implementation

[0026] To enable those skilled in the art to better understand the technical solutions of this disclosure, the disclosure will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an,” “a,” or “the,” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “including,” “comprising,” or “containing,” and similar terms mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. The terms “connected,” “linked,” or similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” and “right,” etc., are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0028] In the field of display technology, COG (Chip on Glass) technology refers to directly bonding the driver IC chip to the glass substrate. COG technology reduces the soldering process of the display panel, significantly reducing its size and making it easier to miniaturize, simplify, and highly integrate, thus reducing overall costs. It is commonly used in small-sized portable display products. Because COG IC chips are highly integrated (combining the timing controller TCON, source driver, and level shift functions into one), they offer a significant cost advantage in circuit design, saving on electronic components (for example, a typical display product has 280 components, while using a COG IC chip solution, the number of components can be reduced to 120).

[0029] In recent years, more and more manufacturers have tried to use COG technology in small and medium-sized display products, and even challenged medium and large-sized display products. However, it is precisely because of its high integration, coupled with the fact that it was originally used in small-sized display products, that some functions required by medium and large-sized display products cannot be integrated into it (for example, image quality detection function (PDF, Pattern Detect Function)). This makes it possible for COG to be used in medium and large-sized display products to result in inadequate VCOM compensation or the inability to recover in time after VCOM is offset by signal coupling, causing problems such as a greenish tint in the display.

[0030] Figure 1a and Figure 1b A schematic diagram illustrating the principle behind the greenish tint of the image. Figure 1a The image shows the pixels of a 1dot display. In a 1dot display, adjacent pixels are white and black, respectively. Figure 1b The diagram illustrates the pixel data signals and VCOM signals of a 1-dot display. When using a column architecture and displaying inverted columns, the first row of the 1-dot display has more positive data signals (red R and blue B pixels) and fewer negative data signals (green G pixels). The coupling capacitance causes the VCOM signal to shift upwards to the position indicated by the dotted line in the diagram. If this shift cannot be recovered in time, the voltage difference between the positive R & B pixels and the VCOM signal will decrease, resulting in a darker image; conversely, the voltage difference between the negative G pixels and the VCOM signal will increase, resulting in a brighter image. Similarly, in this display mode, other rows of the 1-dot display will show a brighter G pixel and a darker R & B pixel, thus resulting in a greenish tint.

[0031] For conventional display products, such as COF (Chip On Film) display products, the timing controller TCON is independent and more powerful. It can use the image quality detection function PDF to change the polarity of the data output for such images, ensuring the balance of positive and negative polarities of the data, so that VCOM can be less affected by data coupling or can recover quickly after being affected.

[0032] Besides the aforementioned PDF function, to enable VCOM to recover quickly after being offset by signal coupling, the only solution is to focus on VCOM feedback compensation. Medium to large-sized conventional display products typically employ symmetrical dual-sided two-point sampling feedback (Feedback), with symmetrical near-end ① / middle-end ② / far-end ③ dual-sided compensation input.

[0033] Figure 2 This is a schematic diagram illustrating the common voltage feedback and compensation for display panels in related technologies. (Example) Figure 2 As shown, the source driver printed circuit board (X-PCB) is located on one side of the display panel, and the common electrode line is arranged around the display area of ​​the display panel. When compensating for the common voltage (VCOM) on the common electrode line, a position on the common electrode line that is far from or in the middle of the X-PCB is used. Figure 2 Set the voltage feedback line at the larger dot in the middle. Figure 2 (The downward arrow in the middle) is used to detect the common voltage on the common electrode; and a compensation voltage is obtained based on the detected common voltage, which is then transmitted through multiple compensation lines ( Figure 2 In the diagram, ①②③) represent multiple points on the common electrode line that are relatively close to the X-PCB (referred to as the proximal end). Figure 2 The compensation line ①), the two points on either side of the middle position (called the middle end) are symmetrical (corresponding to) Figure 2 The compensation line ② in the middle, and two points on both sides symmetrically located at a position far from the X-PCB (called the far end) (corresponding to Figure 2 Compensation is performed using the compensation line ③ in the middle.

[0034] For small and medium-sized conventional display products, this is generally also adopted. Figure 2 The symmetrical bilateral two-point sampling feedback shown, or for cost and practical effect considerations, a symmetrical near ① / far ③ bilateral compensation input is used, that is, the symmetrical near ① / far ③ bilateral compensation input is removed. Figure 2 Compensation line ② in the middle, retain Figure 2 The compensation lines ① and ③ are shown in the diagram.

[0035] For small to medium-sized or small-sized COG display products (e.g., 10.1 inches), the VCOM compensation method for conventional display products can be referenced, or a direct input method can be used instead of feedback. Because of the small product size, the in-plane traces are less affected by coupling, and the direct drive method can also ensure the stability of the VCOM within the screen.

[0036] For medium to large-sized COG display products (e.g., 21.45 inches), especially medium to large-sized vertical COG display products, the vertical VCOM common electrode line in the display panel is relatively long. Even if the VCOM feedback compensation scheme of the above-mentioned medium to large-sized conventional display products is adopted, it is still impossible to solve the greenish problem caused by 1dot screen data coupling VCOM, and the degree of greenishness is abnormally severe.

[0037] According to embodiments of this disclosure, a common voltage compensation device for a display panel is provided. It adopts an asymmetric irregular VCOM feedback and compensation input scheme. By using one side of the middle end as the feedback point of the common voltage VCOM, the feedback point signal is negatively fed back to the near-middle part, the other side of the middle end, and both sides of the far end for compensation input. This allows the external compensation input to be effectively compensated and the offset part to be quickly recovered. This effectively solves the problem of common voltage offset caused by data coupling common voltage and improves the display effect of the display panel.

[0038] Figure 3 This is a schematic diagram illustrating the common voltage feedback and compensation of the display panel according to an embodiment of this disclosure. Figure 3 As shown, the display panel 10 includes a first side A and a second side B that are opposite each other along the column direction. A common voltage compensation device is disposed on the first side A of the display panel. The source drive printed circuit board (X-PCB) is also located on the first side A of the display panel and is connected to the display panel through a flexible printed circuit board (FPC). The COG IC chip is bonded to the glass substrate of the display panel.

[0039] In some embodiments, the display panel 10 further includes a common electrode line 11, which is arranged around the display area of ​​the display panel. The common electrode line includes a proximal region adjacent to the first side A, a distal region adjacent to the second side B and away from the first side A, and a mid-range region between the proximal region and the distal region.

[0040] In some embodiments, such as Figure 3 As shown, the common voltage compensation device according to an embodiment of this disclosure includes a voltage feedback line 12, a common voltage compensation circuit 14, and a voltage compensation line (corresponding to...). Figure 3 (①②③ in the text).

[0041] One end of the voltage feedback line 12 is connected to the feedback point 13 in the middle region of the common electrode line, and the other end is connected to the common voltage compensation circuit 14, which is used to detect the common voltage on the common electrode line 11.

[0042] The common voltage compensation circuit 14 is used to obtain a compensation voltage corresponding to the common voltage based on the common voltage VCOM detected by the voltage feedback line 12;

[0043] One end of the voltage compensation line is connected to the common voltage compensation circuit, and the other end is connected to a first compensation point in the near-end region, a second compensation point in the middle region, and at least one third compensation point in the far-end region of the common electrode line, respectively, for transmitting the compensation voltage to the common electrode line to compensate the common voltage.

[0044] For example, in a display panel, in addition to the common electrode line 11 arranged around the display area of ​​the display panel, it may also include multiple common electrode lines (not shown) within the display area, such as multiple common electrode lines arranged side by side along the column direction of the display panel, which are used to provide a common voltage to the display area. The liquid crystal molecules of each pixel are driven to rotate by the voltage difference between the common voltage and the pixel signal voltage, thereby realizing the display of the image.

[0045] In some embodiments, the display panel further includes a third side C and a fourth side D opposite each other along the row direction, and the feedback point may be located in the middle region adjacent to the third side C, i.e. Figure 3 Feedback point 13; the second compensation point can be located in the middle region near the fourth side D, i.e. Figure 3 The intersection of compensation line ② and common electrode line 11. It should be understood that the feedback point may also be set in the middle region near the fourth side D, and the second compensation point may be set in the middle region near the third side C; this disclosure does not limit this.

[0046] In some embodiments, the feedback point and the second compensation point may be located at the center of the middle region, or they may be located in the middle region biased towards the first side or the second side; the positions of the feedback point and the second compensation point may also be asymmetrically arranged, and this disclosure does not limit the specific positions of the feedback point and the second compensation point.

[0047] According to embodiments of this disclosure, setting the feedback point in the middle region can reduce the signal delay of the detected common voltage and improve the accuracy of the detected common voltage; setting the second compensation point in the middle region at a position opposite to the feedback point can improve the compensation speed and compensation effect of the middle region of the common electrode line.

[0048] Because the routing area of ​​COG display products is limited, too many feedback points and compensation points cannot be set. According to embodiments of this disclosure, common voltage compensation can be achieved with a small number of feedback points and compensation points, thereby improving the display effect of the display panel.

[0049] In some embodiments, one end of the voltage feedback line 12 is connected to the feedback point 13 in the middle region of the common electrode line, and the other end is connected to the common voltage compensation circuit 14, so that the detected common voltage is input to the common voltage compensation circuit 14.

[0050] In some embodiments, the common voltage compensation circuit 14 is used to obtain a compensation voltage corresponding to the common voltage based on the common voltage detected by the voltage feedback line. The common voltage compensation circuit 14 may be disposed on the X-PCB board or outside the X-PCB board; this disclosure does not impose any limitation on this.

[0051] In some embodiments, the common voltage compensation circuit 14 may include multiple operational amplifiers (OPs) to determine the compensation voltage using a negative feedback method. The common voltage compensation circuit obtains a compensation voltage corresponding to the common voltage based on the common voltage detected by the voltage feedback line, including:

[0052] The coupling voltage is determined based on the common voltage detected by the voltage feedback line and the preset common voltage threshold; the coupling voltage is subjected to negative feedback processing based on the compensation multiples of the first compensation point, the second compensation point and the third compensation point to obtain the compensation voltage of the first compensation point, the compensation voltage of the second compensation point and the compensation voltage of the third compensation point respectively.

[0053] For example, the common voltage compensation circuit 14 can determine the voltage difference between the common voltage detected by the voltage feedback line and a preset common voltage threshold, and use this voltage difference as the coupling voltage. If the detected common voltage is greater than the common voltage threshold, the coupling voltage is positive; conversely, if the detected common voltage is less than the common voltage threshold, the coupling voltage is negative. This disclosure does not limit the specific value of the common voltage threshold.

[0054] In some embodiments, compensation multiples for a first compensation point, a second compensation point, and a third compensation point may be preset. The compensation multiples for the first compensation point, the second compensation point, and the third compensation point may be the same or different. The compensation multiples for the first compensation point, the second compensation point, and the third compensation point can be determined through actual testing or through circuit simulation; this disclosure does not impose any limitations on this.

[0055] In some embodiments, based on the compensation multiples of the first compensation point, the second compensation point, and the third compensation point, the common voltage compensation circuit 14 can perform negative feedback processing on the coupling voltage to obtain the compensation voltages of the first compensation point, the second compensation point, and the third compensation point, respectively. That is, if the coupling voltage is positive, then each compensation voltage is negative; if the coupling voltage is negative, then each compensation voltage is positive, so that the compensated common voltage is closer to the common voltage threshold.

[0056] In this way, common voltage compensation can be achieved, reducing the offset of common voltage and thus improving the display effect of the display panel.

[0057] In some embodiments, one end of the voltage compensation line is connected to the common voltage compensation circuit, and the other end is connected to a first compensation point in the near-end region, a second compensation point in the middle region, and at least one third compensation point in the far-end region of the common electrode line, respectively, for transmitting the compensation voltage to the common electrode line to compensate the common voltage.

[0058] In some embodiments, the voltage compensation line includes at least one first compensation line connected to a first compensation point, a second compensation line connected to a second compensation point, and a third compensation line connected to at least one third compensation point.

[0059] In some embodiments, the first compensation point is located in the middle of the proximal region; there are two third compensation points, located on both sides of the distal region, and connected to the corresponding third compensation lines respectively.

[0060] In other words, there can be one or more first compensation lines. For example... Figure 3 As shown, the first compensation line (corresponding to) Figure 3 ①) represents two lines, both connected to the first compensation point located in the middle of the near-end region. If there are multiple first compensation points, multiple first compensation lines can also be connected to the corresponding first compensation points respectively.

[0061] In some embodiments, the second compensation line (corresponding to) Figure 3 ②) can be a line that connects to the second compensation point in the middle region.

[0062] In some embodiments, there may be one or more third compensation points, each with a corresponding third compensation line. In the case of two third compensation points (corresponding to...) Figure 3 In section ③), the two third compensation points are located on both sides of the far-end region and are respectively connected to the corresponding third compensation lines.

[0063] In this way, fewer compensation points are set for the near-end and mid-end regions with smaller delays, and more compensation points are set for the far-end regions with larger delays, which can improve the compensation effect when the number of compensation points is limited.

[0064] The common voltage compensation device for the display panel according to the embodiments of this disclosure can ensure that the feedback point can most accurately reflect the VCOM compensation status within the display panel. This ensures that the mid-end feedback point will not have excessive coupling leading to overcompensation of the near and far inputs, and also ensures that its coupling amount will not be too small, resulting in inadequate compensation of the near and far ends. At the same time, it enables the coupling voltage to recover quickly within less than one line of display time, achieving a balanced and optimal position.

[0065] The common voltage compensation device for the display panel according to the embodiments of this disclosure can be applied to any display panel that does not have a PDF with image quality detection function, especially to vertical display panels based on COG technology, and the size of the display panel is greater than or equal to a preset size threshold, that is, the display panel is a medium to large-sized display panel. The preset size threshold is, for example, set to 20 inches, and this disclosure does not limit the specific value of the preset size threshold.

[0066] In some embodiments, the coupling voltage / recovery time can be used to represent the effect of VCOM compensation. The smaller the coupling voltage, the smaller the offset of the common voltage VCOM, and the better the compensation effect; the smaller the recovery time, the faster the voltage recovery speed of the common voltage VCOM compensation, and the better the display effect.

[0067] In actual testing, the display time for one line on the display panel is approximately 8.5µs (at 60Hz).

[0068] For medium to large-sized COG vertical screen display panels, if the common voltage VCOM feedback compensation method of conventional medium to large-sized display products is used (such as... Figure 2 As shown in the image, for example, each compensation point is set to 1x compensation. Testing confirmed the compensation within the display panel. Under a 1-dot screen, the measured coupling at the feedback point was: Coupling Voltage / Recovery Time = 168mV / 8.5us. This means the common voltage VCOM is offset by data coupling throughout the entire display line time period, resulting in an abnormally severe greenish tint. Increasing the compensation factor further increased the coupling voltage, but failed to reduce the recovery time, indicating that the actual in-plane compensation was still inadequate.

[0069] For medium to large-sized COG vertical screen display panels, if the conventional VCOM feedback compensation method used for small to medium-sized display products is adopted, that is, removing... Figure 2 Compensation line ② in the middle, retain Figure 2 The compensation lines ① and ③ are used to adjust the compensation factor to the optimal value (15x for the near end and 24x for the far end). Testing confirms the in-screen compensation is 320mV / 4.28us. Compared to the initial display state, although the recovery time can be reduced (from 8.5us to 4.28us), the coupling voltage increases (from 168mV to 320mV). After compensation and amplification, overcompensation occurs, resulting in an overall reddish tint to the image and a still poor display effect.

[0070] For medium to large-sized COG vertical screen display panels, the common voltage compensation device of the display panel according to the embodiments of this disclosure is adopted, namely the above-mentioned asymmetric irregular common voltage VCOM feedback compensation method. The compensation factor is adjusted to the optimal condition (the first compensation point in the near-end area is set with a compensation factor of 10 times, the second compensation point on the right side of the middle area is set with a compensation factor of 75 times, and the third compensation point in the far-end area is set with a compensation factor of 24 times). The test confirms that the compensation condition in the screen is: coupling voltage / recovery time = 168mV / 2.12us.

[0071] Figure 4 This is a schematic diagram illustrating the test results of common voltage compensation according to an embodiment of this disclosure. Figure 4 As shown, VCOM-FEED represents the common voltage obtained from the test, and SOUT represents the voltage of the data signal obtained from the test. It can be seen that during the period when SOUT is high (8.5us), VCOM-FEED experiences a certain offset on the rising edge of SOUT becoming high, but it is compensated and recovered after the recovery time (approximately 2.12us), resulting in a small coupling voltage; during the period when SOUT is low, the compensation effect is similar.

[0072] Compared to the initial display state, although the compensation factor was increased, the recovery time was significantly reduced (from 8.5µs to 2.12µs) while keeping the coupling voltage constant. The actual displayed image's Δy decreased from -0.1288 before improvement to -0.0145 after improvement, falling within the preset threshold range of |Δy|. Therefore, the embodiments of this disclosure can significantly improve the display effect of the display panel.

[0073] In some embodiments, Δy can represent the difference between display parameters (color gamut, brightness, etc.) under a full-brightness display and display parameters under a 1-dot display, used to represent the display effect of the display panel. The smaller |Δy| is, the better the display effect. The preset threshold of |Δy| can be set to, for example, 0.02, and this disclosure does not limit it.

[0074] It should be understood that the setting values ​​of the compensation multiples for each of the above compensation points and the values ​​of the compensation-adjusted coupling voltage / recovery time may vary depending on the display panel, and this disclosure does not limit their specific values.

[0075] The common voltage compensation device for the display panel according to the embodiments of this disclosure adopts an asymmetrical irregular VCOM feedback and compensation input scheme. That is, only one side of the vertical screen's middle area is used as the feedback point for the common voltage VCOM (such as a point in the middle of the left side). The feedback point signal is negatively fed back to the middle of the near-end area, the other side of the middle area, and both sides of the far-end area for compensation input. In cases where the wiring area of ​​COG display products is limited and not many feedback points and compensation points can be set, this effectively overcomes the greenish display problem caused by VCOM offset due to display data coupling common voltage VCOM. This allows the external compensation input to be effectively compensated, and the common voltage VCOM offset can be quickly recovered, thereby significantly improving the display effect of the display panel (especially medium and large-sized COG vertical screen display panels).

[0076] According to embodiments of this disclosure, a display panel is also provided, which includes the aforementioned common voltage compensation device for the display panel. This disclosure does not limit the specific type of display panel.

[0077] In some embodiments, the display panel includes a display panel without PDF image quality detection functionality. That is, the common voltage compensation device of this display panel can also be extended to any display panel without PDF functionality, such as a conventional display panel with a TCONIC chip, thereby improving display quality while reducing the cost of the common voltage compensation section of the display product.

[0078] In some embodiments, the display panel includes a vertical display panel based on COG technology, and the size of the display panel is greater than or equal to a preset size threshold. The preset size threshold is, for example, set to 20 inches, and this disclosure does not limit the specific value of the preset size threshold.

[0079] According to embodiments of this disclosure, a display device is also provided, which includes the display panel described above. This display device can be any product or component with display functionality, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigator. Other essential components of this display device are understood by those skilled in the art and will not be described in detail here, nor should they be construed as limiting this disclosure.

[0080] The circuits or sub-circuits described in the embodiments of this disclosure can be implemented in software or hardware. The described circuits or sub-circuits can also be housed in a processor; for example, it can be described as: a processor including: a receiving circuit and a processing circuit, the processing module including a writing sub-circuit and a reading sub-circuit. The names of these circuits or sub-circuits do not necessarily constitute a limitation on the circuit or sub-circuit itself; for example, a receiving circuit can also be described as "receiving video signals".

[0081] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of this disclosure, and this disclosure is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and substance of this disclosure, and these modifications and improvements are also considered to be within the scope of protection of this disclosure.

Claims

1. A common voltage compensation device for a display panel, the display panel including a first side and a second side opposite to each other along a column direction, the common voltage compensation device being disposed on the first side of the display panel. in, The display panel further includes a common electrode line, which is arranged around the display area of ​​the display panel. The common electrode line includes a proximal region adjacent to the first side, a distal region adjacent to the second side, and a mid-range region between the proximal region and the distal region. The common voltage compensation device includes a voltage feedback line, a common voltage compensation circuit, and a voltage compensation line. One end of the voltage feedback line is connected to the feedback point in the middle region of the common electrode line, and the other end is connected to the common voltage compensation circuit, which is used to detect the common voltage on the common electrode line. The common voltage compensation circuit is used to obtain a compensation voltage corresponding to the common voltage based on the common voltage detected by the voltage feedback line; One end of the voltage compensation line is connected to the common voltage compensation circuit, and the other end is connected to a first compensation point in the near-end region, a second compensation point in the middle region, and at least one third compensation point in the far-end region of the common electrode line, respectively, for transmitting the compensation voltage to the common electrode line to compensate the common voltage. The display panel also includes a third side and a fourth side opposite to each other along the row direction. The feedback point is located in the middle region near the third side. The second compensation point is located in the middle region near the fourth side. There are two third compensation points, which are located on both sides of the far region and are respectively connected to the corresponding third compensation lines.

2. The apparatus according to claim 1, wherein, The common voltage compensation circuit obtains a compensation voltage corresponding to the common voltage based on the common voltage detected by the voltage feedback line, including: The coupling voltage is determined based on the common voltage detected by the voltage feedback line and the preset common voltage threshold. Based on the compensation multiples of the first compensation point, the second compensation point, and the third compensation point, negative feedback processing is performed on the coupling voltage to obtain the compensation voltages of the first compensation point, the second compensation point, and the third compensation point, respectively.

3. The apparatus according to claim 2, wherein, The compensation multiples of the first compensation point, the second compensation point, and the third compensation point may be the same or different.

4. The apparatus according to claim 1, wherein, The voltage compensation line includes at least one first compensation line connected to the first compensation point, a second compensation line connected to the second compensation point, and a third compensation line connected to at least one of the third compensation points.

5. The apparatus according to claim 4, wherein, The first compensation point is located in the middle of the proximal region.

6. A display panel, wherein, The display panel includes a common voltage compensation device for the display panel according to any one of claims 1-5.

7. The display panel according to claim 6, wherein, The display panel includes a display panel for PDFs that do not have image quality detection capabilities.

8. The display panel according to claim 6, wherein, The display panel includes a vertical screen display panel based on COG technology, and the size of the display panel is greater than or equal to a preset size threshold.

9. A display device, wherein, The display device includes the display panel as described in any one of claims 6-8.

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