Display device

Abstract

The invention discloses a display device, and belongs to the technical field of display. The display device comprises a display panel and an operational amplifier, and the operational amplifier is used for outputting a first common voltage to a common electrode of each first pixel in a first common voltage adjusting area in the display panel in a current display frame period. And outputting a second common voltage to a common electrode of each second pixel in a second common voltage adjusting region in the display panel, the voltage change direction of the first common voltage is the same as the voltage change direction of the pixel voltage of the first pixel; the voltage change direction of the second common voltage is the same as the voltage change direction of the pixel voltage of the second pixel. Thus, reduction of the voltage difference between the pixel voltage and the common voltage caused by electric leakage is effectively compensated, it can be ensured that the voltage difference between the pixel voltage and the common voltage is kept relatively constant in the whole frame period, and the problem of poor display of picture flickering of the liquid crystal display panel in a low-frequency driving mode is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a display device. BACKGROUND

[0002] With the development of liquid crystal display (LCD) technology, in order to reduce power consumption and adapt to variable refresh rate (VRR) scenarios, liquid crystal display panels often need to run in low frequency (such as 1Hz to 24Hz) mode.

[0003] However, in the low frequency driving mode, the charge in the storage capacitor (Cst) in the pixel structure will continue to leak due to the significant extension of the maintenance time of a single frame of display picture, resulting in continuous attenuation of pixel brightness within the same display frame, thereby causing the liquid crystal display panel to have a human eye-perceptible picture flicker problem in the process of continuous display in the low frequency driving mode.

[0004] Therefore, how to improve the picture flicker problem of the liquid crystal display panel in the low frequency driving mode is a technical problem to be solved by those skilled in the art. SUMMARY

[0005] A display device is provided to at least partially solve the above technical problems.

[0006] The embodiment of the present application provides a display device, comprising: a display panel and an operational amplifier; the display panel comprises a pixel array, a first common voltage adjusting area and a second common voltage adjusting area; The first common voltage adjusting area comprises a plurality of first common voltage sub-adjusting areas, and the second common voltage adjusting area comprises a plurality of second common voltage sub-adjusting areas, each of the first common voltage sub-adjusting areas and each of the second common voltage sub-adjusting areas comprises at least one pixel column in the pixel array, and each of the first common voltage sub-adjusting areas and each of the second common voltage sub-adjusting areas are arranged alternately and spaced apart along the row direction of the pixel array; The operational amplifier is configured to output a first common voltage to the common electrode of each first pixel in the first common voltage adjusting area and output a second common voltage to the common electrode of each second pixel in the second common voltage adjusting area in a current display frame period, the first pixel is a pixel located in the first common voltage adjusting area, and the second pixel is a pixel located in the second common voltage adjusting area. The voltage change direction of the first common voltage is the same as the voltage change direction of the pixel voltage of the first pixel, and the voltage change direction of the second common voltage is the same as the voltage change direction of the pixel voltage of the second pixel.

[0007] In the display device in the present application, each pixel column in the display panel is respectively divided into a first common voltage adjustment area and a second common voltage adjustment area, and an operational amplifier is used to output a first common voltage consistent with the pixel voltage change trend of the first pixel to all the first pixels in the first common voltage adjustment area, and an operational amplifier is used to output a second common voltage consistent with the pixel voltage change trend of the second pixel to all the second pixels in the second common voltage adjustment area, so that the common voltage and the pixel voltage change in the same direction within the same frame, effectively compensating for the decrease in the voltage difference between the pixel voltage and the common voltage caused by the leakage. In this way, the voltage difference between the pixel voltage and the common voltage can be kept relatively constant throughout the frame period, solving the display defect problem of picture flicker of the liquid crystal display panel in the low-frequency driving mode, and improving the display quality of the liquid crystal display panel. BRIEF DESCRIPTION OF DRAWINGS

[0008] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained from these drawings without creative labor for those skilled in the art.

[0009] In order to more completely understand the present application and its beneficial effects, the following will be described in conjunction with the drawings, wherein the same reference numerals in the following description represent the same parts.

[0010] Figure 1 The change trend graph of the pixel voltage in the related art; Figure 2 The schematic diagram of the display device provided by the exemplary embodiment of the present disclosure; Figure 3 One of the top view schematic diagrams of the display panel provided by the exemplary embodiment of the present disclosure; Figure 4 The second top view schematic diagram of the display panel provided by the exemplary embodiment of the present disclosure; Figure 5 The third top view schematic diagram of the display panel provided by the exemplary embodiment of the present disclosure; Figure 6 One of the change trend graphs of the pixel voltage and the common voltage in the exemplary embodiment of the present disclosure; Figure 7 The second change trend graph of the pixel voltage and the common voltage in the exemplary embodiment of the present disclosure; Figure 8 Fig. 3 is a trend chart of the pixel voltage and the common voltage in an exemplary embodiment of the present disclosure.

[0011] Reference signs: 100: display device; 11: display panel; 12: operational amplifier; 13: source driver; 14: first common voltage sub-regulation area; 15: second common voltage sub-regulation area; 16: pixel; 17: first common voltage regulation area; 18: second common voltage regulation area; 19: data line; 20: first pixel; 21: second pixel; 22: first common electrode block; 23: second common electrode block. DETAILED DESCRIPTION

[0012] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0013] In the embodiments of the present application, at least one means one or more; a plurality means two or more. In the description of the present application, the terms "first", "second", "third" and the like are only used for distinguishing the purposes of description, and cannot be understood as indicating or implying relative importance, nor indicating or implying sequence.

[0014] In the present specification, the reference "an embodiment" or "some embodiments" and the like means that a specific feature, structure or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Therefore, the terms "include", "comprise", "have" and their variants in the present specification mean "include but not limited to", unless otherwise specifically emphasized.

[0015] It should be noted that in the embodiments of the present application, the association relationship of the associated objects described by "and / or" means that there can be three relationships, for example, A and / or B can mean that there are three cases of A alone, A and B together, and B alone. In addition, the character " / ", if not specially stated, generally represents a "or" relationship between the front and rear associated objects.

[0016] It should be noted that in the embodiments of the present application, "connection" can be understood as electrical connection, and the connection between two electrical elements can be direct or indirect connection between the two electrical elements. For example, A and B are connected, which can be direct connection between A and B, or indirect connection between A and B through one or more other electrical elements.

[0017] It should be noted that, with the popularity of liquid crystal display panels in energy-saving operation, mobile device low refresh rate mode, and variable refresh rate applications, in some scenarios, the liquid crystal display panel needs to maintain the brightness stability of the display picture in an extremely low refresh frequency range (e.g., 1 Hz to 24 Hz).

[0018] However, the liquid crystal display panel in the related art has a display defect of picture flicker in a low-frequency driving mode.

[0019] Specifically, in the driving process of the liquid crystal display panel, the optical state (i.e., the deflection angle of the liquid crystal molecules) of the pixel is determined by the voltage difference between the pixel voltage (Vp) of the pixel electrode and the common voltage (Vcom) of the common electrode, and the pixel voltage is mainly maintained by the storage capacitor in the pixel structure.

[0020] Figure 1 is a graph of the change trend of the pixel voltage in the related art. Referring to Figure 1 , the theoretical pixel voltage should remain constant throughout the display frame period to maintain the stable optical modulation state of the liquid crystal layer. However, due to the leakage channel caused by the common factors such as thin-film transistor leakage, limited insulating properties of the capacitor dielectric, and parasitic conduction of the liquid crystal material in the pixel structure, the charge in the storage capacitor will gradually leak as the maintenance time of the single-frame display picture increases, thereby causing the actual pixel voltage to exhibit a downward trend over time.

[0021] Especially when the liquid crystal display panel operates in a low-frequency driving mode, due to the significant extension of the maintenance time of each frame of display picture, the cumulative effect of the above charge leakage is more obvious. As the actual pixel voltage gradually decreases over time, while the common voltage remains constant, the voltage difference between the actual pixel voltage and the common voltage also gradually decreases, causing the optical state of the pixel to exhibit a continuous decrease in brightness within the same display frame, thereby causing the liquid crystal display panel to exhibit a display defect of picture flicker in the process of continuous display.

[0022] To solve the display defect of picture flicker of the liquid crystal display panel in the low-frequency driving mode, the related art can maintain the voltage difference between the pixel voltage and the common voltage by increasing the charge retention rate of the storage capacitor in the pixel structure or enhancing the stability of the common voltage.

[0023] For example, in related technologies, the resistance of the common electrode can be reduced and the conductivity of the signal transmission path of the common electrode can be improved by changing the process parameters of the metal layer inside the liquid crystal display panel, thereby suppressing the fluctuation of the common voltage and keeping the common voltage in a relatively constant and stable state within a display frame cycle, so as to reduce the pixel brightness change caused by common voltage coupling interference.

[0024] However, although the above technical solutions can slow down the brightness decay rate and brightness reduction of liquid crystal display panels in low-frequency driving mode to a certain extent, the above technical solutions still have obvious limitations in practical applications.

[0025] Specifically, changing the process parameters of the internal metal layer of the LCD panel not only increases the manufacturing difficulty and mass production instability of the LCD panel, but also fails to solve the problems of device aging and parameter drift that occur over time.

[0026] More importantly, during long-cycle, low-frequency driving, the pixel electrode voltage of a liquid crystal display panel inevitably decays due to leakage current. Furthermore, the common electrode in related liquid crystal display panels typically employs a unified, panel-wide control architecture, with its control strategy focused on maintaining a static, constant common voltage. This static common voltage cannot dynamically match the decay trend of the pixel electrode voltage, causing the voltage difference between the pixel electrode voltage and the common voltage (i.e., the effective voltage determining pixel brightness) to continuously decrease within the same display frame cycle, resulting in gradual brightness variations and flickering in the liquid crystal display panel.

[0027] Furthermore, the unified control of the entire surface of the common electrode architecture lacks the ability to independently adjust for the electrical differences of different pixel columns (such as odd and even columns), making it difficult to eliminate the micro voltage imbalance caused by polarity reversal drive, which will further lead to visible flickering or brightness fluctuations in the display screen.

[0028] In this regard, this application provides a display device. Figure 2 This is a schematic diagram of a display device provided as an exemplary embodiment of this disclosure. Please refer to... Figure 2 The display device 100 includes a display panel 11 and an operational amplifier 12. The display panel 11 includes a pixel array, a first common voltage adjustment area 17, and a second common voltage adjustment area 18.

[0029] Figure 3 This is one of the top views of a display panel provided as an exemplary embodiment of the present disclosure. Figure 4 This is a second top view of a display panel provided as an exemplary embodiment of the present disclosure. Figure 5 This is a third top view schematic diagram of a display panel provided as an exemplary embodiment of this disclosure. Please refer to... Figures 3 to 5The first common voltage adjustment area 17 includes a plurality of first common voltage sub-adjustment areas 14, and the second common voltage adjustment area 18 includes a plurality of second common voltage sub-adjustment areas 15. Each first common voltage sub-adjustment area 14 and each second common voltage sub-adjustment area 15 includes at least one pixel column. Each first common voltage sub-adjustment area 14 and each second common voltage sub-adjustment area 15 are arranged alternately and spaced apart from each other along the row direction of the pixel array.

[0030] The operational amplifier 12 is used to output a first common voltage to the common electrode of each first pixel 20 in the first common voltage adjustment area 17 and to output a second common voltage to the common electrode of each second pixel 21 in the second common voltage adjustment area 18 during the current display frame period. The first pixel 20 is a pixel located in the first common voltage adjustment area 17 and the second pixel 21 is a pixel located in the second common voltage adjustment area 18.

[0031] The voltage change direction of the first common voltage is the same as the voltage change direction of the pixel voltage of the first pixel 20, and the voltage change direction of the second common voltage is the same as the voltage change direction of the pixel voltage of the second pixel 21.

[0032] Specifically, the display device 100 in this embodiment can be applied to various electronic devices with display functions, such as LCD TVs, monitors, mobile phones, tablets, laptops, and vehicle displays.

[0033] In particular, the display device 100 of this embodiment can operate in a low-frequency drive mode, for example, the refresh rate of the display device 100 can be 1Hz to 24Hz.

[0034] The display panel 11 is the core component of the display device 100 for displaying images, and a pixel array is provided in the display area of ​​the display panel 11. The pixel array is composed of a plurality of pixels 16 arranged in a matrix, including a plurality of pixel rows and a plurality of pixel columns. Among them, the pixels 16 are the basic units constituting the display screen, and in this embodiment, the pixels 16 can be red pixels 16, green pixels 16, or blue pixels 16.

[0035] It should be noted that the display panel 11 in this embodiment is a liquid crystal display panel 11.

[0036] In this embodiment, the display panel 11 is further provided with a first common voltage adjustment area 17 and a second common voltage adjustment area 18 for providing a common voltage to each pixel 16 in the pixel array.

[0037] It should be noted that the first common voltage adjustment area 17 in this embodiment is not a single continuous block region, but includes multiple dispersed first common voltage sub-adjustment areas 14. Similarly, the second common voltage adjustment area 18 in this embodiment is also not a single continuous block region, but also includes multiple dispersed second common voltage sub-adjustment areas 15. In terms of spatial arrangement, each first common voltage sub-adjustment area 14 and each second common voltage sub-adjustment area 15 is arranged at intervals along the row direction of the pixel array.

[0038] In this embodiment, each first common voltage adjustment region 17 may include one or two pixel columns, and each second common voltage adjustment region 18 may also include one or two pixel columns. Furthermore, the number of pixel columns included in each first common voltage adjustment region 17 is the same as the number of pixel columns included in each second common voltage adjustment region 18.

[0039] As one implementation method, please refer to Figure 3 The display device 100 also includes a source driver 13; each first common voltage sub-adjustment area 14 and each second common voltage sub-adjustment area 15 includes a pixel column in a pixel array; each pixel column in the pixel array is connected to the source driver 13 via a data line 19.

[0040] Specifically, in this embodiment, the display panel 11 adopts a Stripe architecture, and each pixel column in the pixel array is connected to the source driver 13 through a data line 19.

[0041] Accordingly, please refer to Figure 3 In this embodiment, each first common voltage sub-adjustment region 14 includes an odd-numbered column of pixels in the pixel array. In this embodiment, each second common voltage sub-adjustment region includes an even-numbered column of pixels in the pixel array.

[0042] In this embodiment, the first common voltage sub-adjustment area 14 is spatially divided into strip-shaped areas corresponding one-to-one with the odd-numbered pixel columns (i.e., the first common voltage sub-adjustment area 14). The second common voltage sub-adjustment area 15 is spatially divided into strip-shaped areas corresponding one-to-one with the even-numbered pixel columns (i.e., the second common voltage sub-adjustment area 15). All the first common voltage sub-adjustment areas 14 are electrically interconnected and belong to the first common voltage adjustment area 17, and all the second common voltage sub-adjustment areas 15 are electrically interconnected and belong to the second common voltage adjustment area 18.

[0043] The display device in this embodiment is suitable for a Stripe architecture display panel. By physically binding a data line, a column of pixels, and a common voltage adjustment area, the display device can control the common voltage on a per-pixel-column basis. Furthermore, since pixel voltage polarity reversal in display driving is typically based on the data line, in this embodiment, odd-numbered pixel columns in the pixel array can be divided into a first common voltage adjustment area, and even-numbered pixel columns into a second common voltage adjustment area. This provides the necessary hardware structure foundation for subsequently applying precise common voltage compensation to pixel columns of different polarities.

[0044] As another implementation method, please refer to Figure 4 and Figure 5 The display device 100 also includes a source driver 13; the pixel array includes a plurality of pixel groups, each pixel group including two adjacent pixel columns; the two pixel columns in each pixel group are connected to the source driver 13 via a data line 19; each first common voltage sub-adjustment area 14 and each second common voltage sub-adjustment area 15 include two adjacent pixel columns.

[0045] Specifically, in this embodiment, the pixel array in the display panel 11 may include multiple pixel groups, and each pixel group includes two adjacent pixel columns.

[0046] In this embodiment, the display panel 11 employs a driving architecture that reuses the data line 19, such as a Dual Gate architecture. Two adjacent pixel columns in each pixel group of the pixel array are connected to the source driver 13 via a single data line 19. Under this driving architecture, the pixel voltage of two adjacent pixel columns sharing the same data line 19 is primarily affected by the signal on that same data line 19.

[0047] When the display device 100 is operating in low-frequency drive mode, the leakage characteristics or voltage drift trend of two adjacent pixel columns sharing the same data line 19 are usually highly correlated with the state of the data line 19. Therefore, in this embodiment, two adjacent pixel columns sharing the same data line 19 are defined as a common voltage sub-adjustment area, which can ensure that the change of the common voltage accurately matches the voltage change of all pixels 16 driven by each data line 19.

[0048] Accordingly, please refer to Figure 4 and Figure 5 In this embodiment, each first common voltage sub-adjustment region 14 includes an odd-numbered pixel group in the pixel array. In this embodiment, each second common voltage sub-adjustment region includes an even-numbered pixel group in the pixel array.

[0049] In this embodiment, the first common voltage sub-adjustment area 14 is spatially divided into strip-shaped areas corresponding one-to-one with the odd-numbered pixel groups (i.e., the first common voltage sub-adjustment area 14). The second common voltage sub-adjustment area 15 is spatially divided into strip-shaped areas corresponding one-to-one with the even-numbered pixel groups (i.e., the second common voltage sub-adjustment area 15).

[0050] The display device 100 in this embodiment is suitable for the display panel 11 of the Dual Gate architecture. By keeping the common voltage sub-adjustment area consistent with the pixel column connected to the data line 19, it can achieve accurate voltage compensation for different driving areas without increasing the additional driving complexity. This ensures that low-frequency flicker can be effectively eliminated under various panel architectures, thereby improving the versatility and compatibility of the display device 100.

[0051] It should be noted that in this embodiment, pixel 16 in the first common voltage adjustment area 17 can be defined as the first pixel 20, and pixel 16 in the second common voltage adjustment area 18 can be defined as the second pixel 21.

[0052] Figure 6 This is one of the trend graphs of pixel voltage and common voltage in an exemplary embodiment of this disclosure. In order to maintain stable display brightness of the display device 100 in low-frequency driving mode, the operational amplifier 12 in this embodiment can output a changing first common voltage to all first pixels 20 in the first common voltage adjustment area 17 and a changing second common voltage to all second pixels 21 in the second common voltage adjustment area 18 during the current display cycle.

[0053] Within the current display frame period, the pixel voltage of the first pixel 20 located in the first common voltage adjustment area 17 may gradually decrease (or increase) due to leakage. At this time, the first common voltage output by the operational amplifier 12 will also be controlled to decrease (or increase) synchronously. Similarly, the pixel voltage of the second pixel 21 located in the second common voltage adjustment area 18 may gradually increase (or decrease) due to leakage. The second common voltage output by the operational amplifier 12 will also be controlled to increase (or decrease) synchronously.

[0054] Figure 7 This is the second exemplary embodiment of the present disclosure showing the trend of pixel voltage and common voltage changes. Please refer to... Figure 7In the case where each first common voltage sub-adjustment area 14 includes an odd-numbered pixel column in the pixel array, and each second common voltage sub-adjustment area includes an even-numbered pixel column in the pixel array, during the current display frame period, the pixel voltage of the first pixel 20 located in the odd-numbered pixel column may gradually decrease (or increase) due to leakage. At this time, the first common voltage output by the operational amplifier 12 will also be controlled to decrease (or increase) synchronously. Similarly, the pixel voltage of the second pixel 21 located in the even-numbered pixel column may gradually increase (or decrease) due to leakage. The second common voltage output by the operational amplifier 12 will also be controlled to increase (or decrease) synchronously.

[0055] Figure 8 This is the third exemplary embodiment of the present disclosure showing the trend of pixel voltage and common voltage changes. Please refer to... Figure 8 In the case where each first common voltage sub-adjustment area 14 includes an odd-numbered pixel group in the pixel array, and each second common voltage sub-adjustment area includes an even-numbered pixel group in the pixel array, during the current display frame period, the pixel voltage of the first pixel 20 located in the odd-numbered pixel group may gradually decrease (or increase) due to leakage. At this time, the first common voltage output by the operational amplifier 12 will also be controlled to decrease (or increase) synchronously. Similarly, the pixel voltage of the second pixel 21 located in the even-numbered pixel group may gradually increase (or decrease) due to leakage. The second common voltage output by the operational amplifier 12 will also be controlled to increase (or decrease) synchronously.

[0056] It should be noted that in this embodiment, the driving polarities of the first pixel 20 and the second pixel 21 can be the same or different. Accordingly, when the driving polarities of the first pixel 20 and the second pixel 21 are the same, the voltage change directions of the first common voltage and the second common voltage are the same; when the driving polarities of the first pixel 20 and the second pixel 21 are different, the voltage directions of the first common voltage and the second common voltage are different.

[0057] The display device in this embodiment divides each pixel column in the display panel into a first common voltage adjustment area and a second common voltage adjustment area. It uses an operational amplifier to output a first common voltage to all first pixels in the first common voltage adjustment area, with the voltage change trend of the first pixels being consistent with that of the first pixels. Similarly, it uses an operational amplifier to output a second common voltage to all second pixels in the second common voltage adjustment area, with the voltage change trend of the second pixels being consistent with that of the second pixels. This ensures that the common voltage and pixel voltage change in the same direction within the same frame, effectively compensating for the reduction in voltage difference between the pixel voltage and the common voltage caused by leakage. This ensures that the voltage difference between the pixel voltage and the common voltage remains relatively constant throughout the entire frame cycle, solving the display problem of screen flickering in low-frequency driving mode of the liquid crystal display panel and improving the display quality of the liquid crystal display panel.

[0058] In some embodiments, the driving polarities of the first pixel 20 and the second pixel 21 are opposite; the voltage changes of the first common voltage and the second common voltage are in opposite directions during the current display frame period.

[0059] Specifically, to prevent damage from polarization of liquid crystal molecules, the liquid crystal display panel 11 typically employs an AC driving method (e.g., column inversion). Under this driving method, the polarities of adjacent pixel columns are usually opposite.

[0060] For example, within the current display frame cycle, the first pixel 20 located in the odd-numbered pixel column can be driven as positive, that is, the pixel voltage of the first pixel 20 is greater than the first common voltage; while the second pixel 21 located in the even-numbered pixel column can be driven as negative, that is, the pixel voltage of the second pixel 21 is less than the second common voltage.

[0061] For example, within the current display frame cycle, the first pixel 20 located in the odd-numbered pixel group can be driven to positive polarity, that is, the pixel voltage of the first pixel 20 is greater than the first common voltage; while the second pixel 21 located in the even-numbered pixel group can be driven to negative polarity, that is, the pixel voltage of the second pixel 21 is less than the second common voltage.

[0062] When the driving polarity of the first pixel 20 is positive and the driving polarity of the second pixel 21 is negative, during the current display frame cycle, the pixel voltage of the first pixel 20 will gradually decrease due to charge leakage, and the pixel voltage of the second pixel 21 will gradually increase due to charge leakage. The pixel voltages of the first pixel 20 and the second pixel 21 change in opposite directions during the current display cycle.

[0063] When the driving polarity of the first pixel 20 is negative and the driving polarity of the second pixel 21 is positive, within the current display frame cycle, the pixel voltage of the first pixel 20 will gradually increase as charge leakage occurs, and the pixel voltage of the second pixel 21 will gradually decrease as charge leakage occurs. The pixel voltages of the first pixel 20 and the second pixel 21 change in opposite directions within the current display cycle.

[0064] It is understandable that, within the current display frame cycle, the voltage change direction of the first pixel 20 and the second pixel 21 both tends to move towards the common voltage.

[0065] Accordingly, when the pixel voltage of the first pixel 20 and the pixel voltage of the second pixel 21 change in opposite directions within the current display cycle, the first common voltage and the second common voltage change in opposite directions within the current display frame cycle, so as to maintain a constant voltage difference between the pixel voltage of the first pixel 20 and the first common voltage, and a constant voltage difference between the pixel voltage of the second pixel 21 and the second common voltage.

[0066] When the driving polarity of the first pixel 20 is positive and the driving polarity of the second pixel 21 is negative, the first common voltage gradually decreases and the second common voltage gradually increases within the current display frame period. Conversely, when the driving polarity of the first pixel 20 is negative and the driving polarity of the second pixel 21 is positive, the first common voltage gradually increases and the second common voltage gradually decreases within the current display frame period.

[0067] The display device in this embodiment fully considers the polarity difference between adjacent pixel columns under the column inversion driving architecture. By controlling the first common voltage and the second common voltage to present opposite voltage change directions, it can simultaneously meet the leakage compensation requirements of positive and negative polarity pixels in the same display frame period. It can ensure that the voltage difference between the pixel voltage and the common voltage can remain stable, regardless of whether the number of pixel columns is odd or even, thereby eliminating the local or overall flickering phenomenon caused by polarity reversal.

[0068] In some embodiments, a plurality of first common electrode blocks 22 are provided in the first common voltage regulation region 17, and a plurality of second common electrode blocks 23 are provided in the second common voltage regulation region 18.

[0069] Each first common electrode block 22 serves as a common electrode for a first pixel 20 in a first common voltage sub-adjustment area 14; each second common electrode block 23 serves as a common electrode for a second pixel 21 in a second common voltage sub-adjustment area 15.

[0070] Specifically, please refer to Figure 3In the case where each first common voltage sub-adjustment area 14 includes an odd-numbered pixel column in the pixel array and each second common electrode sub-adjustment area includes an even-numbered pixel column in the pixel array, each first common electrode block 22 can serve as a common electrode for a first pixel 20 in an odd-numbered pixel column and each second common electrode block 23 can serve as a common electrode for a second pixel 21 in an even-numbered pixel column.

[0071] Please refer to Figure 4 In the case where each first common voltage sub-adjustment region 14 includes an odd-numbered pixel group in the pixel array and each second common electrode sub-adjustment region includes an even-numbered pixel group in the pixel array, the two first common electrode blocks 22 can respectively serve as the common electrodes of the first pixels 20 in the two pixel columns of the odd-numbered pixel group, and the two second common electrode blocks 23 can respectively serve as the common electrodes of the second pixels 21 in the two pixel columns of the even-numbered pixel group.

[0072] Please refer to Figure 5 In the case where each first common voltage sub-adjustment area 14 includes an odd-numbered pixel group in the pixel array and each second common electrode sub-adjustment area includes an even-numbered pixel group in the pixel array, each first common electrode block 22 can serve as a common electrode for a first pixel 20 in an odd-numbered pixel group, and each second common electrode block 23 can serve as a common electrode for a second pixel 21 in an even-numbered pixel group.

[0073] In this embodiment, in order to achieve partitioned common voltage control of the first common voltage adjustment area 17 and the second common voltage adjustment area 18, the common electrode layer in the display panel 11 can be physically patterned and cut into multiple independent strip-shaped common electrode blocks, which serve as the first common electrode block 22 and the second common electrode block 23, or as the first sub-common electrode block and the second sub-common electrode block.

[0074] All first common electrode blocks 22 belonging to the first common voltage regulation area 17 are connected in the non-display area of ​​the display panel 11 via metal wiring. Similarly, all second common electrode blocks 23 belonging to the second common voltage regulation area 18 are also connected in the non-display area.

[0075] The display device in this embodiment includes a plurality of first common electrode blocks disposed in a first common voltage adjustment area and a plurality of second common electrode blocks disposed in a second common voltage adjustment area. Each first common electrode block serves as a common electrode for a first pixel in a first common voltage sub-adjustment area, and each second common electrode block serves as a common electrode for a second pixel in a second common voltage sub-adjustment area. Physically, a common electrode pattern matching the column driving architecture of the pixel array is constructed, providing a physical architecture basis for realizing independent adjustment of the common voltage of the first common voltage adjustment area and the second common voltage adjustment area.

[0076] In some embodiments, the first output terminal of the operational amplifier 12 is connected to the input line of each first common electrode block 22, and the second output terminal of the operational amplifier 12 is connected to the input line of each second common electrode block 23.

[0077] Operational amplifier 12 is used to output a first common voltage to each first common electrode block 22 through the first output terminal and the input lines of each first common electrode block 22 during the current display frame cycle, and to output a second common voltage to each second common electrode block 23 through the second output terminal and the input lines of each second common electrode block 23.

[0078] Specifically, the operational amplifier 12 in this embodiment has at least two independent output terminals or two output terminals implemented through time-division multiplexing. The first output terminal of the operational amplifier 12 is connected to the input lines of each first common electrode block 22, and is used to output a dynamically changing first common voltage to the first pixel 20 within the first common voltage adjustment region 17 through the first output terminal and the input lines of each first common electrode block 22. The second output terminal of the operational amplifier 12 is connected to the input lines of each second common electrode block 23, and is used to output a dynamically changing second common voltage to the second image within the second common voltage adjustment region 18 through the second output terminal and the input lines of each second common electrode block 23.

[0079] This embodiment clarifies the transmission links of the first common voltage and the second common voltage, ensuring that the common voltage generated by the operational amplifier can be accurately and with low impedance transmitted to the corresponding common voltage adjustment region, thereby achieving precise adjustment of the common voltage in different common voltage adjustment regions.

[0080] In some embodiments, the first inverting input terminal of the operational amplifier 12 is connected to the feedback line of each first common electrode block 22, and the second inverting input terminal of the operational amplifier 12 is connected to the feedback line of each second common electrode block 23.

[0081] Operational amplifier 12 is used to acquire the first target data corresponding to the current moment through the feedback lines of the first inverting input terminal and each first common electrode, acquire the second target data corresponding to the current moment through the feedback lines of the second inverting input terminal and each second common electrode, and then determine the first common voltage corresponding to the next moment based on the first target data corresponding to the current moment, determine the second common voltage corresponding to the next moment based on the second target data corresponding to the current moment, and output the corresponding first common voltage to each first common electrode block 22 and the corresponding second common voltage to each second common electrode block 23 at the next moment.

[0082] Specifically, due to the load effect and RC delay of the common electrode of the display panel 11, a simple open-loop output may not be able to accurately compensate for the small drift of the pixel voltage. Therefore, in order to achieve high-precision voltage tracking, this embodiment introduces a feedback mechanism to realize real-time common voltage compensation for the first pixel 20 and the second pixel 21.

[0083] In this embodiment, the operational amplifier 12 adopts a feedback-based adjustment mechanism. The feedback lines of each first common electrode block 22 are connected to the operational amplifier 12 through the inverting input terminal of the operational amplifier 12, and the feedback lines of each second common electrode block 23 are connected to the operational amplifier 12 through the inverting input terminal of the operational amplifier 12.

[0084] It should be noted that, in the microstructure of the display panel 11, although the pixel 16 electrode of the first pixel 20 and the first common electrode block 22 are separated by an insulating layer and a liquid crystal layer, they form a liquid crystal capacitor (and a storage capacitor) in terms of electrical characteristics. Therefore, there is a significant capacitive coupling effect between the pixel 16 electrode of the first pixel 20 and the first common electrode block 22.

[0085] When the display device 100 is operating in low-frequency drive mode, when the pixel voltage of the first pixel 20 changes due to leakage or other reasons (e.g., the voltage gradually decays), according to the principle of capacitive coupling, the change in the electrode potential of the pixel 16 will be instantaneously coupled to the first common electrode block 22, which is the other plate of the capacitor, causing the actual voltage on the first common electrode block 22 to fluctuate or drift accordingly.

[0086] Therefore, for the current moment of the current display frame, the feedback lines of each first common electrode block 22 can transmit the actual voltage signal (i.e., the first target data) containing the pixel voltage change characteristics of the first pixel 20 at the current moment back to the operational amplifier 12 in real time and without loss through the first inverting input terminal of the operational amplifier 12. The feedback lines of each second common electrode block 23 can transmit the actual voltage signal (i.e., the second target data) containing the pixel voltage change characteristics of the second pixel 21 at the current moment back to the operational amplifier 12 in real time and without loss through the second inverting input terminal of the operational amplifier 12.

[0087] Operational amplifier 12, utilizing its negative feedback characteristics, can sense the potential fluctuation trend on the first common electrode block 22 in real time based on the first target data corresponding to the current moment. Since this potential fluctuation is caused by the leakage current of the pixel voltage, operational amplifier 12, by monitoring the changes in the feedback signal, can indirectly and substantially obtain the voltage difference change trend between the first common voltage and the pixel voltage of the first pixel 20.

[0088] Similarly, the operational amplifier 12 can also sense the potential fluctuation trend on the second common electrode block 23 in real time based on the second target data corresponding to the current moment, and thus know the voltage difference change trend between the second common voltage and the pixel voltage of the second pixel 21.

[0089] Furthermore, operational amplifier 12 can dynamically generate the magnitude of the first common voltage output to the first pixel 20 within the first common voltage adjustment region 17 at the next moment based on the first target data corresponding to the current moment, so that the voltage difference between the first common voltage output at the next moment and the pixel voltage of the first pixel 20 remains constant. Operational amplifier 12 can also dynamically generate the magnitude of the second common voltage output to the second pixel 21 within the second common voltage adjustment region 18 at the next moment based on the second target data corresponding to the current moment, so that the voltage difference between the second common voltage output at the next moment and the pixel voltage of the second pixel 21 remains constant.

[0090] It should be noted that the time interval between the current moment and the next moment in this embodiment is predefined based on prior knowledge and / or actual situation.

[0091] In some embodiments, the first target data includes pixel voltage change feature data of the first pixel 20; the second target data includes pixel voltage change feature data of the second pixel 21.

[0092] In this embodiment, the display device utilizes the feedback circuits of each first common electrode block and each second common electrode block to construct a closed-loop control system for the common voltage. The operational amplifier can sense the pixel voltage changes of the first pixel and the second pixel in real time, and dynamically adjust the magnitude of the output first common voltage and second common voltage in real time to ensure that the change curves of the first common voltage and the second common voltage can accurately fit the leakage curve of the pixel voltage, thereby minimizing the brightness deviation to the greatest extent.

[0093] In some embodiments, the operational amplifier 12 is further configured to determine the preset common voltage as the first common voltage and the second common voltage corresponding to the start time of the current display frame period, and output the corresponding first common voltage to each first common electrode block 22 at the start time of the current display frame period, and output the corresponding second common voltage to each second common electrode block 23.

[0094] Specifically, at the beginning of the current display frame cycle, a new data voltage is written to the pixels 16 in the display panel 11. At this time, both the first common voltage and the second common voltage need to be reset to a standard DC level in order to perform correct data writing.

[0095] Therefore, in this embodiment, the operational amplifier 12 outputs a preset common voltage (e.g., the optimal common voltage pre-calibrated at the factory) to the first pixel 20 in the first common voltage adjustment area 17 and the second pixel 21 in the second common voltage adjustment area 18 at the beginning of the current display frame period. After the beginning of the current display frame period, the operational amplifier 12 begins to perform the aforementioned common voltage following compensation operation.

[0096] The display device in this embodiment defines the timing start point for voltage adjustment in the first common voltage adjustment area and the second common voltage adjustment area, ensuring that the image writing stage of each frame can be based on the standard common voltage, avoiding interference from the common voltage residue of the previous display frame on the image writing of the current display frame, and ensuring the correctness of image display.

[0097] In some embodiments, the operational amplifier 12 includes a first operational amplifier and a second operational amplifier.

[0098] The first operational amplifier is used to output a first common voltage to the common electrode of each first pixel 20 within the first common voltage adjustment area 17 during the current display frame period.

[0099] The second operational amplifier is used to output a second common voltage to the common electrode of each second pixel 21 within the second common voltage adjustment area 18 during the current display frame period.

[0100] Specifically, in order to ensure driving capability and signal isolation, this embodiment can employ two physically independent first operational amplifiers and second operational amplifiers, which are used to output a first common voltage to the common electrode of each first pixel 20 in the first common voltage adjustment area 17, and to output a second common voltage to the common electrode of each second pixel 21 in the second common voltage adjustment area 18.

[0101] This embodiment, by employing a dual operational amplifier architecture, can effectively avoid crosstalk between the first common voltage and the second common voltage. Furthermore, each operational amplifier only needs to drive half of the panel load, which can improve the transient response speed and stability of the common voltage output, and facilitate the achievement of higher precision common voltage compensation.

[0102] In some embodiments, the display device 100 further includes: a display driver chip; an operational amplifier 12 is integrated in the display driver chip.

[0103] Specifically, in order to reduce the cost of the display device 100 and reduce the size of the circuit board, the operational amplifier 12 in this embodiment can be integrated inside the display driver IC (DDIC), so that the common voltage compensation described above can be achieved by using the existing analog circuit module in the display driver IC or by adding a dedicated operational amplifier 12 module.

[0104] The display device in this embodiment integrates the operational amplifier into the display driver chip, eliminating the need for separate amplifier chips on flexible circuit boards or printed circuit boards. This simplifies module design and improves the integration and reliability of the display device.

[0105] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0106] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Although this application has disclosed preferred embodiments as above, it is not intended to limit this application. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the technical solution of this application. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A display device, characterized in that, include: A display panel and an operational amplifier; the display panel includes a pixel array, a first common voltage adjustment area, and a second common voltage adjustment area; The first common voltage adjustment area includes a plurality of first common voltage sub-adjustment areas, and the second common voltage adjustment area includes a plurality of second common voltage sub-adjustment areas. Each of the first common voltage sub-adjustment areas and each of the second common voltage sub-adjustment areas includes at least one pixel column. Each of the first common voltage sub-adjustment areas and each of the second common voltage sub-adjustment areas are arranged alternately and spaced apart from each other along the row direction of the pixel array. The operational amplifier is used to output a first common voltage to the common electrode of each first pixel and a second common voltage to the common electrode of each second pixel during the current display frame cycle. The first pixel is a pixel located in the first common voltage adjustment area, and the second pixel is a pixel located in the second common voltage adjustment area. The voltage change direction of the first common voltage is the same as the voltage change direction of the pixel voltage of the first pixel, and the voltage change direction of the second common voltage is the same as the voltage change direction of the pixel voltage of the second pixel.

2. The display device according to claim 1, characterized in that, The driving polarities of the first pixel and the second pixel are opposite; the voltage changes of the first common voltage and the second common voltage are in opposite directions during the current display frame period.

3. The display device according to claim 1, characterized in that, The display device further includes a source driver; each pixel column in the pixel array is connected to the source driver via a data line; each of the first common voltage sub-adjustment areas and each of the second common voltage sub-adjustment areas includes a pixel column.

4. The display device according to claim 1, characterized in that, The display device further includes a source driver; the pixel array includes multiple pixel groups, each pixel group including two adjacent pixel columns; the two pixel columns in each pixel group are connected to the source driver via a data line; each first common voltage sub-adjustment area and each second common voltage sub-adjustment area include two adjacent pixel columns.

5. The display device according to any one of claims 1 to 4, characterized in that, include: The first common voltage regulation area is provided with a plurality of first common electrode blocks, and the second common voltage regulation area is provided with a plurality of second common electrode blocks; Each of the first common electrode blocks serves as a common electrode for each first pixel in the first common voltage sub-adjustment region; and each of the second common electrode blocks serves as a common electrode for each second pixel in the second common voltage sub-adjustment region.

6. The display device according to claim 5, characterized in that, The first output terminal of the operational amplifier is connected to the input line of each of the first common electrode blocks, and the second output terminal of the operational amplifier is connected to the input line of each of the second common electrode blocks. The operational amplifier is used to output a first common voltage to each of the first common electrode blocks through the first output terminal and the input lines of each of the first common electrode blocks during the current display frame period, and to output a second common voltage to each of the second common electrode blocks through the second output terminal and the input lines of each of the second common electrode blocks.

7. The display device according to claim 5, characterized in that, The first inverting input terminal of the operational amplifier is connected to the feedback line of each of the first common electrode blocks, and the second inverting input terminal of the operational amplifier is connected to the feedback line of each of the second common electrode blocks. The operational amplifier is used to acquire the first target data corresponding to the current moment through the feedback lines of the first inverting input terminal and each of the first common electrodes, acquire the second target data corresponding to the current moment through the feedback lines of the second inverting input terminal and each of the second common electrodes, determine the first common voltage corresponding to the next moment based on the first target data corresponding to the current moment, determine the second common voltage corresponding to the next moment based on the second target data corresponding to the current moment, and output the corresponding first common voltage to each of the first common electrode blocks and the corresponding second common voltage to each of the second common electrode blocks at the next moment.

8. The display device according to claim 5, characterized in that, The operational amplifier is further configured to determine the preset common voltage as the first common voltage and the second common voltage corresponding to the start time of the current display frame period, output the corresponding first common voltage to each of the first common electrode blocks at the start time of the current display frame period, and output the corresponding second common voltage to each of the second common electrode blocks.

9. The display device according to any one of claims 1 to 4, characterized in that, The operational amplifier includes a first operational amplifier and a second operational amplifier; The first operational amplifier is used to output the first common voltage to the common electrode of each first pixel in the first common voltage adjustment area during the current display frame period; The second operational amplifier is used to output the second common voltage to the common electrode of each second pixel in the second common voltage adjustment area during the current display frame period.

10. The display device according to any one of claims 1 to 4, characterized in that, Also includes: The display driver chip; the operational amplifier is integrated in the display driver chip.

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