Display device

Abstract

The embodiment of the utility model relates to a display device. The display device comprises a display panel; the common electrode is connected with the display panel through a common electrode signal line; the detection potential is arranged on the display panel and is used for detecting the detection voltage of the common electrode; the compensation potential is arranged on the display panel; the compensation circuit is electrically connected with the compensation potential and the detection potential respectively; wherein the compensation circuit is used for generating a compensation voltage according to a common electrode voltage and the detection voltage, and sending the compensation voltage to the compensation potential, so that the compensation potential applies the compensation voltage to the output end of the common electrode signal line. According to the display panel, the crosstalk problem caused by voltage deviation of the common electrode can be counteracted, so that the display reliability of the display panel is improved.

Description

Technical Field

[0001] This utility model relates to the field of display technology, and in particular to a display device. Background Technology

[0002] LCD (Liquid Crystal Display) is a display device that uses liquid crystal materials to change their optical properties under the influence of an electric field to display images.

[0003] In an LCD, liquid crystal molecules rearrange themselves under the influence of an electric field, thereby changing the light transmittance and displaying images. To ensure image quality, LCD panels require precise control signals, among which the VCOM (Voltage of Common Electrode) signal is a crucial one. The VCOM signal provides a reference point for the panel's backplane, and its precise value varies depending on the panel. Therefore, the VCOM value needs to be set at the factory to match the characteristics of different panels.

[0004] However, in the prior art, there is often parasitic capacitance between the data line and the common electrode. When the data line voltage changes, the parasitic capacitance will couple with the common electrode, thereby affecting the voltage of the common electrode. This causes horizontal crosstalk to easily appear on the display screen of the TFT-LCD, affecting the display effect and the display reliability of the display panel. Utility Model Content

[0005] Therefore, in order to overcome at least some of the defects and deficiencies of the prior art, this utility model provides a display device.

[0006] On one hand, an embodiment of this utility model provides a display device, for example, comprising: a display panel; a common electrode connected to the display panel via a common electrode signal line; a detection potential disposed on the display panel for detecting the detection voltage of the common electrode; a compensation potential disposed on the display panel; and a compensation circuit electrically connected to the compensation potential and the detection potential respectively; wherein the compensation circuit is used to generate a compensation voltage based on the common electrode voltage and the detection voltage, and send it to the compensation potential, so that the compensation potential applies the compensation voltage to the output terminal of the common electrode signal line.

[0007] In one embodiment of the present invention, the display panel includes a central area and an edge area, and the detection potential is disposed in the edge area.

[0008] In one embodiment of this utility model, the display panel includes a long side and a short side, and the detection potential is set on the short side.

[0009] In one embodiment of this utility model, the detection potential is set at the middle position of the short side.

[0010] In one embodiment of this utility model, the detection potential includes a plurality of detection potentials, which are uniformly distributed along the short side of the display panel.

[0011] In one embodiment of this utility model, the compensation potential includes a plurality of such potentials, which are uniformly distributed along the short side of the display panel.

[0012] In one embodiment of this invention, the compensation circuit is connected to the compensation potential via the common electrode signal line.

[0013] In one embodiment of this utility model, the compensation circuit includes a voltage comparison module and a feedback module. The voltage comparison module is electrically connected to the feedback module. The voltage comparison module is used to compare the common electrode voltage and the detected voltage, and generate a compensation voltage signal to be sent to the feedback module. The feedback module is used to transmit the compensation voltage to the compensation potential through the common electrode signal line.

[0014] In one embodiment of this invention, the compensation potential and the detection potential are gold adhesive dots on the edge region.

[0015] In one embodiment of this utility model, the display panel is a liquid crystal display panel.

[0016] As can be seen from the above, the technical features of this utility model can have the following beneficial effects:

[0017] This invention improves the display reliability of the display panel by setting a detection potential and a compensation potential on the display panel, and by compensating the voltage of the common electrode through a compensation circuit and the compensation potential, thereby offsetting the crosstalk problem caused by the voltage deviation of the common electrode. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a timing diagram of the common electrode and data line potentials that cause horizontal crosstalk in existing display panels.

[0020] Figure 2 This is a schematic diagram of the structure of a display device shown in this embodiment.

[0021] Figure 3 for Figure 2 The diagram shows the function of the common electrode for compensation potential.

[0022] Figure 4 for Figure 2 The diagram shows a module schematic of the compensation circuit.

[0023] [Explanation of Identifiers in the Attached Image]

[0024] 1: Display device; 10: Display panel; 11: Long side; 12: Short side; 20: Common electrode; 21: Common electrode signal line; 31: Compensation potential; 32: Detection potential; 40: Compensation circuit; 41: Voltage comparison module; 42: Feedback module; 101: Center area; 102: Edge area. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] like Figure 2 As shown, this application provides a display device 1, which may include, for example, a display panel 10, a common electrode 20, a compensation potential 31, a detection potential 32, and a compensation circuit 40.

[0027] Specifically, the common electrode 20 is connected to the display panel 10 via a common electrode signal line 21; the detection potential 32 is disposed on the display panel 10 for detecting the detection voltage of the common electrode 20; and the compensation potential 31 is disposed on the display panel 10. The compensation circuit 40 is electrically connected to both the compensation potential 31 and the detection potential 31; wherein, the compensation circuit 40 generates a compensation voltage based on the common electrode voltage and the detection voltage, and sends it to the compensation potential 31, so that the compensation potential 31 applies the compensation voltage to the output terminal of the common electrode signal line 21.

[0028] The display panel 10 includes a first substrate and a second substrate facing the first substrate. Data lines and scan lines are intersected on the first substrate, and pixel electrodes are formed in the intersection areas. A common electrode Vcom is integrally formed on the surface of the second substrate, and a liquid crystal capacitor and a liquid crystal layer fill the space between the pixel electrodes and the common electrode. The voltage input to the pixels in the display panel 10 is output through a printed circuit board interface on the outside of the display panel 10. In one type of display panel, the common electrode, in addition to its wiring on the lower plate, also needs to be connected to the upper plate and connected to an externally supplied common electrode power supply. The common electrode to the upper plate is bonded to the substrate in a dotted structure using conductive adhesive doped with gold or silver. This allows for conductive connection of the common electrodes of the upper and lower plates when they are essentially bonded together. The common electrode surrounds the pixel array with a wide wiring pattern. The display panel 10 may be, for example, a liquid crystal display panel.

[0029] The common electrode voltage is supplied externally, requiring the display panel 10 to be connected to an external source. The common electrode voltage is the initial lossless common electrode voltage Vcom input voltage, which is input to the display panel 10 via the common electrode signal line 21.

[0030] The detected voltage is the voltage value obtained after detecting the detection potential 32. The common electrode voltage is the theoretically input voltage value from the outside, which can directly receive the voltage signal input from the external power supply. The detected voltage is the voltage collected from the detection potential 32, which corresponds to the actual input voltage on the corresponding trace. Then, the compensation circuit 40 calculates the voltage value to be compensated based on the above two inputs.

[0031] The compensation circuit 40 is connected to the compensation potential 31 and the detection potential 32. The compensation circuit 40 obtains a compensation voltage through the detection voltage and the common electrode voltage, and applies this compensation voltage to the compensation potential 31, thereby compensating the output voltage of the common electrode signal line. Figure 3 As shown, by applying a compensation voltage to the position to be compensated, the output voltage of the common electrode signal line can be compensated to counteract crosstalk caused by the common electrode voltage offset. The compensation circuit 40 can, for example, compare the detected voltage with the common electrode voltage to obtain the difference, and use this difference as the compensation voltage value. The compensation circuit 40 can, for example, be composed of an inverting operational amplifier, whose input terminals are the detected voltage of the detection potential 32 and the voltage of the common electrode, and whose output is the compensation voltage, which is output to the compensation potential 31.

[0032] Because existing display panels include scan lines and data lines, and also a common electrode layer electrically insulated from the scan lines and data lines, a parasitic capacitance Cgc is formed between the common electrode and the scan lines, and a parasitic capacitance is formed between the common electrode layer and the data lines. The capacitive coupling effect of this capacitance can cause the common electrode voltage to deviate from its set potential. Figure 1 As shown, this can cause horizontal crosstalk issues on the display panel under certain driving conditions. This application addresses this by setting a detection potential 32 and a compensation potential 31 on the display panel 10. First, a detection voltage is obtained through the detection potential 32. Then, the common electrode voltage is compared with the detection voltage in the compensation circuit 40. The compensation circuit 40 and the compensation potential 31 compensate for the voltage of the common electrode, thus offsetting the crosstalk problem caused by the common electrode voltage offset and improving the display panel's reliability.

[0033] Furthermore, the display panel 10 includes a central area 101 and an edge area 102, with the detection potential 32 disposed within the edge area 102. In other embodiments, the display panel 10 can be divided into three equal parts along its length, with the middle part being the central area and the parts on both sides of the central area being the edge areas.

[0034] Furthermore, the display panel 10 includes a long side 11 and a short side 12, with the detection potential 32 disposed on the short side 12. The display panel 10 may be, for example, a rectangular panel, where the long side 11 is the length direction of the rectangle, and the short side is the width direction of the rectangle. The wide side of the display panel 10 is the gate terminal, and the long side is the source terminal.

[0035] Furthermore, the detection potential 32 is positioned at the midpoint of the short side 12. Positioning the detection potential 32 at the midpoint of the short side 12 helps to improve the compensation effect.

[0036] Furthermore, the detection potential 32 includes a plurality of detection potentials 32, which are evenly distributed along the short side 12 of the display panel 10.

[0037] Furthermore, the compensation potential 31 includes a plurality of such potentials, which are evenly distributed along the short side 12 of the display panel 10.

[0038] Furthermore, the compensation circuit 40 is connected to the compensation potential 31 via the common electrode signal line 21 to improve the compensation effect.

[0039] Furthermore, such as Figure 4As shown, the compensation circuit 40 includes a voltage comparison module 41 and a feedback module 42. The voltage comparison module 41 is electrically connected to the feedback module 42. The voltage comparison module 41 compares the common electrode voltage and the detected voltage, and generates a compensation voltage signal which is sent to the feedback module 42. The feedback module 42 transmits the compensation voltage to the compensation potential through the common electrode signal line. The voltage comparison module 41 may be, for example, an operational amplifier or a voltage comparator, and the feedback module 42 may be, for example, a power amplifier.

[0040] Furthermore, the compensation potential 31 and the detection potential 32 are gold adhesive dots on the edge region 102. By selecting the gold adhesive dots inherently set on the display panel 10 for detection and compensation, no additional points need to be set, optimizing the loop routing and improving the compensation effect.

[0041] Furthermore, it is understood that the foregoing embodiments are merely illustrative examples of this utility model. Provided that the technical features do not conflict, the structure is not contradictory, and the inventive purpose of this utility model is not violated, the technical solutions of the various embodiments can be arbitrarily combined and used.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A display device, characterized by comprising: The application relates to a display panel and a compensation circuit thereof. The display panel comprises a display panel, a common electrode connected with the display panel through a common electrode signal line, a detection potential arranged on the display panel for detecting a detection voltage of the common electrode, a compensation potential arranged on the display panel, and a compensation circuit connected with the compensation potential and the detection potential respectively. The compensation circuit is used for generating a compensation voltage according to the common electrode voltage and the detection voltage and sending the compensation voltage to the compensation potential, so that the compensation potential applies the compensation voltage to an output end of the common electrode signal line. The display panel comprises a center area and an edge area, and the detection potential is arranged in the edge area. The display panel comprises a long side and a short side, and the detection potential is arranged on the short side. The detection potential is arranged at a middle position of the short side. The detection potential comprises a plurality of detection potentials which are uniformly distributed along the short side of the display panel.

2. The display device according to claim 1, wherein The compensation potential comprises a plurality of compensation potentials which are uniformly distributed along the short side of the display panel.

3. The display device according to claim 1, wherein The compensation circuit is connected with the compensation potential through the common electrode signal line.

4. The display device according to claim 3, wherein The compensation circuit comprises a voltage comparison module and a feedback module, the voltage comparison module is electrically connected with the feedback module, the voltage comparison module is used for comparing the common electrode voltage and the detection voltage and generating a compensation voltage signal which is sent to the feedback module, and the feedback module is used for transmitting the compensation voltage to the compensation potential through the common electrode signal line.

5. The display device according to claim 3, wherein The compensation potential and the detection potential are gold dots on the edge area.

6. The display device according to claim 3, wherein The display panel is a liquid crystal display panel.

7. The display device according to claim 1, wherein ​ 8. The display device according to claim 7, wherein ​ 9. The display device according to claim 2, wherein ​ 10. The display device according to any one of claims 1 to 9, wherein ​

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