Display driving circuit, display panel and crosstalk elimination method

Abstract

The application relates to a display driving circuit, a display panel and a crosstalk elimination method. The display driving circuit comprises a CF substrate common electrode and a source driving circuit. A feedback line of the CF substrate common electrode is connected with a target gamma voltage output end of the source driving circuit and grounded through a grounding capacitor. The target gamma voltage output end of the source driving circuit is used for following the voltage of the feedback line of the CF substrate common electrode, and a bright line is generated at a display line crosstalk through gamma voltage adjustment, so as to offset the line crosstalk. By connecting the feedback line of the CF substrate common electrode with the target gamma voltage output end of the source driving circuit, the gamma voltage of the target gamma voltage output end is reduced to generate a white line at the line crosstalk (i.e. a bright line is generated accurately at the connection), until the black line crosstalk at the line crosstalk is offset, so that the line crosstalk which cannot be eliminated in a traditional scheme is eliminated, and the purpose of high horizontal crosstalk elimination reliability is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a display driving circuit, a display panel and a crosstalk elimination method. BACKGROUND

[0002] With the rapid development of the display panel field, the demand for large-size high-resolution display panels is increasing, and the display effect of display panel products is becoming more and more demanding. Existing research has found that the excessive resistance of the common electrode and the excessive coupling capacitance between the common electrode and the data line in the display panel can cause the voltage jump on the data line to cause the voltage on the common electrode to be unstable, resulting in the problem of horizontal crosstalk of the display panel, and further causing display problems such as uneven brightness and flickering, resulting in poor display effect. To solve the foregoing problem, the traditional scheme is to provide a voltage compensation circuit applied to a display panel, which includes two components of a voltage analysis sub-circuit and a gamma voltage generation sub-circuit. By real-time acquisition of the pixel voltage of the target pixel to analyze the abnormality of the display panel, the gamma voltage is automatically adjusted to make the pixel voltage of the target pixel consistent when abnormal, thereby offsetting the influence of the common voltage drift on the pixel voltage of the target pixel, thereby improving the horizontal crosstalk problem of the display panel. However, in the implementation process, the inventors found that the foregoing traditional scheme at least has the technical problem of low reliability of horizontal crosstalk elimination. SUMMARY

[0003] Therefore, it is necessary to provide a display driving circuit with high reliability of horizontal crosstalk elimination, a gate driving circuit and a display panel in view of the technical problem of high cost of the foregoing circuit.

[0004] To achieve the above-mentioned purpose, on the one hand, the embodiments of the present application provide a display driving circuit, which comprises a CF substrate common electrode and a source driving circuit. The feedback line of the CF substrate common electrode is connected with the target gamma voltage output end of the source driving circuit, and is grounded through a grounding capacitor.

[0005] The target gamma voltage output end of the source driving circuit is used to follow the voltage of the feedback line of the CF substrate common electrode, and a bright line is generated by gamma voltage adjustment at the display line crosstalk, thereby offsetting the line crosstalk.

[0006] In one of the embodiments, the target gamma voltage output end of the source driving circuit is the eighth gamma voltage output end.

[0007] In one of the embodiments, the target gamma voltage output end of the source driving circuit is the fourteenth gamma voltage output end.

[0008] In one of the embodiments, the circuit further comprises a connecting resistor, one end of the connecting resistor is connected to the CF substrate common electrode, the target gamma voltage output end of the source electrode driving circuit and the ground capacitor respectively, and the other end of the connecting resistor is used for connection.

[0009] In another aspect, the embodiments of the present application further provide a display panel comprising the display driving circuit.

[0010] In another aspect, the embodiments of the present application further provide a crosstalk elimination method applied to a display driving circuit, the driving circuit comprising a CF substrate common electrode and a source electrode driving circuit, the method comprising the steps of:

[0011] After the feedback line of the CF substrate common electrode is connected to the target gamma voltage output end of the source electrode driving circuit, the gamma voltage of the target gamma voltage output end is reduced to generate a bright line at the display line crosstalk;

[0012] When the gamma voltage of the target gamma voltage output end is reduced to a target voltage, the gamma voltage of the target gamma voltage output end is kept as the target voltage; the target voltage is the corresponding gamma voltage when the generated bright line eliminates the display line crosstalk.

[0013] In one of the embodiments, the target gamma voltage output end is the eighth gamma voltage output end.

[0014] In one of the embodiments, the target gamma voltage output end is the fourteenth gamma voltage output end.

[0015] In one of the embodiments, the method further comprises the steps of:

[0016] The remaining display line crosstalk is eliminated by using the voltage compensation method.

[0017] One of the technical solutions in the above technical solution has the following advantages and beneficial effects:

[0018] The display driving circuit, the display panel and the crosstalk elimination method have the advantages that the target gamma voltage output end of the source driving circuit can produce the same action (linkage) when the feedback line of the CF substrate common electrode is connected, that is, the target gamma voltage output end of the source driving circuit can be connected with the feedback line of the CF substrate common electrode at the linear crosstalk, and thus, the display screen brightness can be improved by reducing the gamma voltage of the target gamma voltage output end to produce a white line at the linear crosstalk (that is, a bright line is accurately produced at the connection position), until the black linear crosstalk at the linear crosstalk is eliminated, so that the linear crosstalk that cannot be eliminated in the prior art is eliminated, and the purpose of high horizontal crosstalk elimination reliability is achieved.

[0019] Additional aspects and advantages of the present application will be set forth in part in the following description, will become apparent to those skilled in the art on examination of the following description, or will be learned from practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 A schematic diagram of a crosstalk picture with a white background and a gray frame;

[0021] Figure 2 A schematic diagram of compensation for adjusting PGM symmetry;

[0022] Figure 3 A schematic diagram of a partial structure of a display driving circuit in an embodiment;

[0023] Figure 4 A schematic diagram of producing a bright line to eliminate black linear crosstalk in an embodiment;

[0024] Figure 5 A schematic diagram of adjusting the voltage difference between Gam8 / 14 and CFCOM in an embodiment;

[0025] Figure 6 A schematic diagram of a display panel in an embodiment. DETAILED DESCRIPTION

[0026] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be realized in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided so that the disclosure of the present application is more thorough and comprehensive.

[0027] It should be noted that when one element is considered to be "connected" to another element, it can be directly connected to and integrated with the other element, or there may be an intervening element present. The terms "one end," "the other end," and similar expressions used in this document are for illustrative purposes only.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] In related technologies, the display panel displays a specified crosstalk detection image to detect whether horizontal crosstalk exists on the display panel, such as... Figure 1 The diagram shown illustrates horizontal crosstalk in display panels in related technologies. Figure 1 As shown, in the crosstalk image with a white background and gray frame, there are two image parts, one of which surrounds the other. The background grayscale ranges from 0 to 255. For example, one image part is a rectangle with dimensions equal to the display panel, and the other image part is a rectangle with dimensions half that of the display panel. The two images have different grayscale levels. Figure 1 The two straight lines shown, extending from the two sides of one image portion to the outer edge of the other image portion, are the black lines generated when horizontal crosstalk occurs.

[0030] When the display panel is in use, the grayscale voltage of a pixel located at the boundary of another image portion and connected to a data line there undergoes a sudden change. Specifically, the grayscale voltage of a pixel on one boundary of another image portion abruptly rises from the grayscale voltage corresponding to a lower grayscale to the grayscale voltage corresponding to a higher grayscale, while the grayscale voltage of a relative pixel on the opposite boundary of another image portion abruptly drops from the grayscale voltage corresponding to a higher grayscale to the grayscale voltage corresponding to the lower grayscale. Due to the large-size panel manufacturing process, the power consumption of the driving circuit is relatively high during voltage abrupt changes. According to the overall power conservation principle, the power of other parts of the display panel decreases, causing the common voltage to drift downward instantaneously and slowly recover to its normal value. In existing related technologies in this field, the grayscale voltage is the signal voltage provided by the data line in signal changes. Changes in the common voltage and the signal changes in the grayscale voltage can be caused by abrupt changes in the common signal at 1 / 4 frame and 3 / 4 frame, because the display content of the other image portion is determined, and the common signal abruptly changes at the boundary of the other image portion.

[0031] Because the common electrode drifts downwards, the effective value of the common voltage decreases, resulting in a larger voltage difference with the normal grayscale voltage, i.e., an increase in pixel voltage. Differences in pixel voltage exist between pixels located on the same horizontal line and connected to the last column of data lines, as well as between other pixels connected to the last column of data lines. This causes several rows of pixels at the grayscale boundary to appear generally darker, leading to horizontal crosstalk and reducing the display panel's display effect. In other words, the drift of the common voltage affects the pixel voltage of pixels in the aforementioned locations, causing horizontal crosstalk.

[0032] Based on the above-mentioned mechanism of horizontal crosstalk generation, traditional solutions include: one is to adjust the symmetry of the PGM so that the voltage difference ΔV1≈ΔV2, such as... Figure 2 As shown, the positive and negative pulls approximately cancel out the pull on the common voltage COM, where Wt represents the wave time. Another approach is to reduce the gamma voltage GM1, i.e., simultaneously reduce the voltage difference ΔV1 and ΔV2, thereby reducing the impact of voltage switching on the CF substrate common voltage Cfcom. However, in practice, the inventors have found that when the above-mentioned conventional solutions are applied to the horizontal crosstalk problem caused by the channel capacitance CVCOM couple (connection) of the array substrate common electrode ACOM / panel common drive electrode VCOM, sometimes one of the linear crosstalks cannot be eliminated in practical applications, resulting in a technical problem of low reliability in horizontal crosstalk elimination. Therefore, this application provides a new technical solution to address the aforementioned technical problem.

[0033] In one embodiment, such as Figure 3 As shown, a display driving circuit 100 is provided, including a common electrode 12 of a CF substrate and a source driving circuit 14. The feedback line of the CF substrate common electrode 12 is connected to the target gamma voltage output terminal of the source driving circuit 14 and grounded through a grounding capacitor C. The target gamma voltage output terminal of the source driving circuit 14 is used to follow the voltage of the feedback line of the CF substrate common electrode 12, and to generate bright lines at the display line crosstalk points by adjusting the gamma voltage to cancel the line crosstalk.

[0034] It is understood that in the actual display driving circuit 100 of the display substrate, in addition to the CF substrate common electrode 12 and the source driving circuit 14 mentioned above, there are other inherent components. These can be understood by referring to the structure of existing display driving circuits in the art, and will not be listed in detail here. The target gamma voltage output terminal can be the gamma voltage output electrode connected to the pixel corresponding to the linear crosstalk point in the source driving circuit 14.

[0035] Specifically, in this embodiment, the feedback line (which can be denoted as CFCOM_FB) of the CF substrate common electrode 12 in the display driving circuit 100 of the display substrate is connected to the target gamma voltage output terminal (which can be denoted as GamX) of the source driving circuit 14. When CFCOM_FB is connected, GamX can have the same action (linkage), such as... Figure 4 As shown, GamX can be coupled with CFCOM_FB at the line crosstalk point.

[0036] Increasing the voltage difference Δ1 / Δ2 between GamX and CFCOM can improve screen brightness, such as... Figure 5 As shown. Therefore, by gradually reducing the GamX voltage, a white line can be generated at the coupling point (and only a bright line will be generated at the coupling point) until the black linear crosstalk is canceled out (for example, until the black line of horizontal crosstalk is indistinguishable to the human eye). In other words, by connecting CFCOM_FB to GamX and reducing the GamX voltage, a white line with freely controllable voltage (brightness) can be generated at the linear crosstalk point, thereby canceling out the black linear crosstalk with the white line.

[0037] The aforementioned display driving circuit 100 connects the feedback line of the CF substrate common electrode 12 to the target gamma voltage output terminal of the source driving circuit 14, enabling the target gamma voltage output terminal of the source driving circuit 14 to perform the same action (linkage) when the feedback line of the CF substrate common electrode 12 is connected. That is, the target gamma voltage output terminal of the source driving circuit 14 can connect at the linear crosstalk point along with the feedback line of the CF substrate common electrode 12. Thus, since increasing the voltage difference between the target gamma voltage output terminal and the feedback line of the CF substrate common electrode 12 can improve the brightness of the display screen, a white line (i.e., a bright line is precisely generated at the connection point) can be generated at the linear crosstalk point by reducing the gamma voltage of the target gamma voltage output terminal until the black linear crosstalk at the linear crosstalk point is canceled out. This eliminates the horizontal linear crosstalk caused by the ACOM / CVCOM couple that cannot be eliminated in the traditional solution, achieving the goal of high reliability in horizontal crosstalk elimination.

[0038] In one embodiment, the target gamma voltage output terminal of the source drive circuit 14 is the eighth gamma voltage output terminal. It can be understood that in this embodiment, for horizontal line crosstalk caused by the ACOM / CVCOM couple, the line crosstalk that may not be eliminated in conventional solutions is located at the eighth gamma voltage output terminal Gam8. Therefore, by connecting CFCOM_FB to Gam8 and reducing the Gam8 voltage, a white line with freely controllable voltage (brightness) can be generated at the line crosstalk location, thereby canceling out the black line crosstalk with the white line.

[0039] In one embodiment, the target gamma voltage output terminal of the source drive circuit 14 is the fourteenth gamma voltage output terminal. It can be understood that in this embodiment, for horizontal line crosstalk caused by the ACOM / CVCOM couple, the line crosstalk that may not be eliminated in conventional solutions is located at the fourteenth gamma voltage output terminal Gam14. Therefore, by connecting CFCOM_FB to Gam14 and reducing the Gam14 voltage, a white line with freely controllable voltage (brightness) can be generated at the line crosstalk location, thereby canceling out the black line crosstalk with the white line.

[0040] It should be noted that those skilled in the art will understand that in some other embodiments, the target gamma voltage output terminal of the source drive circuit 14 described above can also be other gamma voltage output terminals besides Gam8 / 14. The specific type can be determined according to the circuit structure of different display drive circuits. As long as the above-mentioned technical concept of this application is applied in the same way, it is acceptable.

[0041] In one embodiment, such as Figure 3 As shown, the display driving circuit 100 also includes a connecting resistor R. One end of the connecting resistor R is connected to the common electrode 12 of the CF substrate, the target gamma voltage output terminal of the source driving circuit 14, and the grounding capacitor C, respectively. The other end of the connecting resistor R is used for connection.

[0042] In one embodiment, such as Figure 6 As shown, a display panel 200 is also provided, including the display driving circuit 100 described above.

[0043] It is understood that the specific explanation of the display driving circuit 100 in this embodiment can be understood by referring to the corresponding explanations in the embodiments of the above-mentioned display driving circuits 100, and will not be repeated here.

[0044] Those skilled in the art will understand that, in addition to the display driving circuit 100 described above, the display panel 200 may also include other structural components not detailed in this specification. For specific details, please refer to different types of display panel products already available in the art.

[0045] The aforementioned display panel 200 can eliminate one black linear crosstalk using the voltage compensation method in a conventional solution, and then eliminate the other black linear crosstalk using the solution adopted by the display driving circuit 100. Specifically, the feedback line CFCOM_FB of the CF substrate common electrode 12 in the display driving circuit 100 of the display substrate is connected to the target gamma voltage output terminal GamX of the source driving circuit 14. The voltage of the target gamma voltage output terminal GamX is reduced to generate a bright line at the coupling point until the black linear crosstalk is canceled out.

[0046] The aforementioned display panel 200, by applying the aforementioned display driving circuit 100, effectively improves the reliability of horizontal crosstalk cancellation and enhances the display effect.

[0047] In one embodiment, a crosstalk cancellation method is also provided, applied to a display driving circuit, the driving circuit including a CF substrate common electrode and a source driving circuit, the method including the following steps:

[0048] After the feedback line of the common electrode of the CF substrate is connected to the target gamma voltage output terminal of the source drive circuit, the gamma voltage at the target gamma voltage output terminal is reduced to produce a bright line at the linear crosstalk in the display.

[0049] When the gamma voltage at the target gamma voltage output terminal decreases to the target voltage, the gamma voltage at the target gamma voltage output terminal is maintained at the target voltage; the target voltage is the gamma voltage corresponding to the generation of bright lines to eliminate linear crosstalk.

[0050] It is understood that in the actual display driving circuit of the display substrate, in addition to the aforementioned CF substrate common electrode and source driving circuit, there are other inherent components. These can be understood by referring to the structure of existing display driving circuits in the art, and will not be listed in detail here. The target gamma voltage output terminal can be the gamma voltage output electrode connected to the pixel corresponding to the linear crosstalk point in the source driving circuit.

[0051] Specifically, in this embodiment, the feedback line CFCOM_FB of the CF substrate common electrode in the display driving circuit of the display substrate is connected to the target gamma voltage output terminal GamX of the source driving circuit. Since the two are connected, when CFCOM_FB couples, GamX can have the same action (linkage), that is, GamX can couple with CFCOM_FB at the line crosstalk. Therefore, the gamma voltage at the target gamma voltage output terminal can be controlled to decrease, so as to display the bright line generated at the line crosstalk.

[0052] Specifically, since increasing the voltage difference Δ1 / Δ2 between GamX and CFCOM can improve screen brightness, a white line can be generated at the coupler (and only a bright line will be generated at the coupler) by gradually decreasing the GamX voltage until the black linear crosstalk is canceled. The target voltage is the GamX voltage corresponding to when the generated bright line just eliminates the display linear crosstalk.

[0053] The aforementioned crosstalk cancellation method connects the feedback line of the common electrode of the CF substrate to the target gamma voltage output terminal of the source drive circuit. This allows the target gamma voltage output terminal of the source drive circuit 4 to connect at the linear crosstalk point along with the feedback line of the common electrode of the CF substrate. Since increasing the voltage difference between the target gamma voltage output terminal and the feedback line of the common electrode of the CF substrate can improve the brightness of the display screen, a white line (i.e., a bright line is precisely generated at the connection point) can be generated at the linear crosstalk point by reducing the gamma voltage at the target gamma voltage output terminal until the black linear crosstalk at the linear crosstalk point is canceled out. This eliminates the horizontal linear crosstalk caused by the ACOM / CVCOM couple, which cannot be eliminated in traditional solutions, and achieves the goal of high reliability in horizontal crosstalk cancellation.

[0054] In one embodiment, the crosstalk cancellation method described above further includes the following control steps:

[0055] Voltage compensation is used to eliminate the remaining linear crosstalk in the display.

[0056] It is understandable that the voltage compensation method is the same as the gamma voltage compensation method used in traditional solutions. It uses a designed voltage analysis sub-circuit to collect the pixel voltage of the target pixel in real time to analyze the abnormal condition of the display panel. When there is an abnormality, the gamma voltage is automatically adjusted by the gamma voltage generation sub-circuit to make the pixel voltage of the target pixel consistent, so as to offset the influence of the drift of the common voltage on the pixel voltage of the target pixel and improve the horizontal crosstalk problem of the display panel.

[0057] Specifically, in this embodiment, after eliminating one black linear crosstalk line using the voltage compensation method in a conventional approach, the other black linear crosstalk line is eliminated using the crosstalk elimination method described above. That is, the feedback line CFCOM_FB of the CF substrate common electrode in the display driver circuit of the display substrate is connected to the target gamma voltage output terminal GamX of the source driver circuit. The voltage at the target gamma voltage output terminal GamX is reduced to generate a bright line at the coupling point, until the black linear crosstalk line is canceled out.

[0058] By following the steps described above, all horizontal crosstalk on the display screen can be effectively eliminated in practical applications, achieving higher reliability in crosstalk elimination.

[0059] In one embodiment, the target gamma voltage output terminal is the eighth gamma voltage output terminal. It can be understood that in this embodiment, for horizontal line crosstalk caused by the ACOM / CVCOM couple, the line crosstalk that may not be eliminated in conventional solutions is located at the eighth gamma voltage output terminal Gam8. Therefore, by connecting CFCOM_FB to Gam8 and reducing the Gam8 voltage, a white line with freely controllable voltage (brightness) can be generated at the line crosstalk location, thereby canceling out the black line crosstalk with the white line.

[0060] In one embodiment, the target gamma voltage output terminal is the fourteenth gamma voltage output terminal. It can be understood that in this embodiment, for horizontal line crosstalk caused by the ACOM / CVCOM couple, the line crosstalk that may not be eliminated in conventional solutions is located at the fourteenth gamma voltage output terminal Gam14. Therefore, by connecting CFCOM_FB to Gam14 and reducing the Gam14 voltage, a white line with freely controllable voltage (brightness) can be generated at the line crosstalk location, thereby canceling out the black line crosstalk with the white line.

[0061] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A display driving circuit, characterized in that, It includes a common electrode of a CF substrate and a source drive circuit. The feedback line of the common electrode of the CF substrate is directly connected to the target gamma voltage output terminal of the source drive circuit and is grounded through a grounding capacitor. The target gamma voltage output terminal of the source drive circuit is used to follow the voltage of the feedback line of the common electrode of the CF substrate, and to generate a bright line by adjusting the gamma voltage at the point of linear crosstalk to cancel the linear crosstalk; the target gamma voltage output terminal of the source drive circuit performs the same action when connected to the feedback line of the common electrode of the CF substrate. The step of generating a bright line by adjusting the gamma voltage at the display line crosstalk point to cancel the line crosstalk includes: reducing the gamma voltage at the target gamma voltage output terminal to increase the voltage difference between the target gamma voltage output terminal and the feedback line of the common electrode of the CF substrate.

2. The display driving circuit according to claim 1, characterized in that, The target gamma voltage output terminal of the source drive circuit is the eighth gamma voltage output terminal.

3. The display driving circuit according to claim 1, characterized in that, The target gamma voltage output terminal of the source drive circuit is the fourteenth gamma voltage output terminal.

4. The display driving circuit according to any one of claims 1 to 3, characterized in that, It also includes a connecting resistor, one end of which is connected to the feedback line of the common electrode of the CF substrate, the target gamma voltage output terminal of the source drive circuit, and the grounding capacitor.

5. A display panel, characterized in that, Includes the display driving circuit as described in any one of claims 1 to 4.

6. A method for eliminating crosstalk, characterized in that, Applied to a display driving circuit as described in any one of claims 1 to 4, the display driving circuit comprising a CF substrate common electrode and a source driving circuit, the method comprising the steps of: After the feedback line of the common electrode of the CF substrate is connected to the target gamma voltage output terminal of the source drive circuit, the gamma voltage of the target gamma voltage output terminal is controlled to decrease so as to generate a bright line at the display line crosstalk. When the gamma voltage at the target gamma voltage output terminal decreases to the target voltage, the gamma voltage at the target gamma voltage output terminal is maintained at the target voltage. The target voltage is the gamma voltage corresponding to the generation of bright lines to eliminate the linear crosstalk of the display; The step of controlling the reduction of the gamma voltage at the target gamma voltage output terminal to generate a bright line at the display line crosstalk includes: reducing the gamma voltage at the target gamma voltage output terminal to increase the voltage difference between the target gamma voltage output terminal and the feedback line of the common electrode of the CF substrate; the target gamma voltage output terminal of the source drive circuit performs the same action when connected to the feedback line of the common electrode of the CF substrate.

7. The crosstalk cancellation method according to claim 6, characterized in that, The target gamma voltage output terminal is the eighth gamma voltage output terminal.

8. The crosstalk cancellation method according to claim 6, characterized in that, The target gamma voltage output terminal is the fourteenth gamma voltage output terminal.

9. The crosstalk cancellation method according to any one of claims 6 to 8, characterized in that, The method further includes the following steps: Voltage compensation is used to eliminate the remaining linear crosstalk in the display.

Images