Driving method and driving circuit

Abstract

The application provides a driving method and a driving circuit. The driving method is used for driving a display panel to display an image. The driving method comprises the following steps: receiving a data signal from a video source via a connection line, and detecting a noise signal on the connection line; and when the noise signal is detected, outputting pixel voltages with the same polarity in a current frame and a previous frame to drive the display panel.

Description

Technical Field

[0001] This invention relates to a driving method and driving circuit for driving a display panel. Background Technology

[0002] LCD displays are prone to irregular noise when subjected to signal interference. To reduce noise interference, the driving circuit can employ a TFT gate shielding method to prevent video data affected by noise from being applied to the pixel electrodes. Since there is no signal to shield the TFT gate in a GOA (gate-on-array) architecture, the driving circuit uses a method of shielding the gate frequency signal to avoid applying incorrect video data to the pixel electrodes.

[0003] Because LCDs require polarity inversion, after shielding the gate frequency signal for one frame, the pixel electrodes in the display area will not undergo polarity inversion for three consecutive frames. This leads to prolonged charge accumulation, and when charging with the same polarity, changes in brightness can cause image quality issues. Consequently, screen flicker caused by noise may occur, thus degrading image quality. Summary of the Invention

[0004] This invention provides a driving method and driving circuit that can solve the problem of screen flickering caused by noise in display panels.

[0005] Embodiments of the present invention provide a driving method for driving a display panel to display an image. The driving method includes: receiving a data signal from a video source via a connection line and detecting a noise signal on the connection line; and when a noise signal is detected, outputting pixel voltages of the same polarity in the current frame and the previous frame to drive the display panel.

[0006] Embodiments of the present invention provide a driving circuit for driving a display panel to display an image. The driving circuit includes a detection circuit and a source driving circuit. The detection circuit is coupled to a video source via a connection line. The detection circuit is used to receive data signals from the video source via the connection line and to detect noise signals on the connection line. The source driving circuit is coupled to the detection circuit and the display panel. The source driving circuit is used to output pixel voltages to drive the display panel. When a noise signal is detected, the pixel voltages have the same polarity in the current frame and the previous frame. Attached Figure Description

[0007] Figure 1 This is a block diagram of a display device according to an embodiment of the present invention.

[0008] Figure 2 This is a schematic diagram illustrating a display panel driven in a column-reversal manner when no noise signal is detected, according to an embodiment of the present invention.

[0009] Figure 3 The waveform and corresponding polarity of the pixel voltage when no noise signal is detected are shown in the embodiments of the present invention.

[0010] Figure 4 This is a schematic diagram illustrating how a display panel is driven in a column-reversal manner when a noise signal is detected, according to an embodiment of the present invention.

[0011] Figure 5 The waveform and corresponding polarity of the pixel voltage when a noise signal is detected are shown in the embodiments of the present invention.

[0012] Figure 6 This is a schematic diagram illustrating a display panel driven in a frame-inverted manner when no noise signal is detected, according to an embodiment of the present invention.

[0013] Figure 7 The waveform and corresponding polarity of the pixel voltage when no noise signal is detected are shown in the embodiments of the present invention.

[0014] Figure 8 This is a schematic diagram illustrating a display panel driven in a frame-inverted manner when a noise signal is detected, according to an embodiment of the present invention.

[0015] Figure 9 The waveform and corresponding polarity of the pixel voltage when a noise signal is detected are shown in the embodiments of the present invention.

[0016] Figure 10 This is a flowchart illustrating the steps of the driving method according to an embodiment of the present invention. Detailed Implementation

[0017] The term "coupled (or connected)" as used throughout the specification (including the claims) may refer to any direct or indirect means of connection. For example, if the text describes a first device coupled (or connected) to a second device, it should be interpreted as the first device being directly connected to the second device, or the first device being indirectly connected to the second device through other devices or some means of connection. The terms "first," "second," etc., used throughout the specification (including the claims) are used to name elements or distinguish different embodiments or scopes, and are not intended to limit the upper or lower limit of the number of elements, nor to limit the order of elements. Furthermore, wherever possible, elements / components / steps using the same reference numerals in the drawings and embodiments represent the same or similar parts. Elements / components / steps using the same reference numerals or the same terms in different embodiments may be referred to mutually in the relevant descriptions.

[0018] Figure 1This is a block diagram of a display device according to an embodiment of the present invention. Please refer to... Figure 1 The display device 100 includes a driving circuit 110 and a display panel 120. The driving circuit 110 drives the display panel 120 to display an image. The driving circuit 110 can drive the display panel 120 in column inversion, frame inversion, or dot inversion. Dot inversion includes 1+2 dot inversion or N dot inversion, where N = 2, 4, 8, 16, 32, etc. In an embodiment, the driving circuit 110 may be a display driver integrated circuit (DDIC), but the present invention is not limited thereto.

[0019] Specifically, the driving circuit 110 includes a detection circuit 112, a source driving circuit 114, a buffer circuit 116, and a counter circuit 118. The source driving circuit 114 is coupled to the display panel 120. The source driving circuit 114 is used to output a pixel voltage Vp to drive the display panel 120 to display an image. The source driving circuit 114 may include multiple source output buffers, and each source output buffer is used to drive a corresponding pixel column of the display panel 120.

[0020] Detection circuit 112 is coupled to video source TX via connection line 200. Detection circuit 112 receives data signal Vd from video source TX via connection line 200. Detection circuit 112 detects the presence of noise signal S1 on connection line 200, which may cause drive circuit 110 to receive incorrect data. Detection circuit 112 then notifies counter circuit 118 whether noise signal S1 has been detected. Counter circuit 118 determines the polarity output of the next frame based on buffer settings.

[0021] The noise signal S1 can be any noise or short clock pulse (glitch) signal generated on the external connection line 200. In an embodiment, the noise signal S1 can be electrostatic discharge (ESD) interference, but the invention is not limited thereto.

[0022] A buffer circuit 116 is coupled to a detection circuit 112 and a counter circuit 118. The buffer circuit 116 stores a flag. The flag indicates whether a noise signal S1 has been detected. For example, the flag is set to a first value "1" to indicate that a noise signal S1 has been detected, and the flag is set to a second value "0" to indicate that a noise signal S1 has not been detected. The flag setting value is not intended to limit the invention. The flag value can be set by the detection circuit 112 or other control circuitry.

[0023] Counter circuit 118 is coupled to detection circuit 112 and buffer circuit 116. Counter circuit 118 is used to count frame values ​​according to vertical synchronization signal S2. When noise signal S1 is detected, counter circuit 118 stops counting frame values; when noise signal S1 is not detected, counter circuit 118 continues to count frame values.

[0024] In this embodiment, the buffer circuit 116 outputs an enable signal S3 to control the operation of the counter circuit 118. For example, the buffer circuit 116 can set the enable signal S3 to a first value "1" according to a flag, and the enable signal S3 set to the first value "1" can stop the counter circuit 118 when a noise signal S1 is detected. On the other hand, the buffer circuit 116 can set the enable signal S3 to a second value "0" according to a flag, and the enable signal S3 set to the second value "0" will not stop the counter circuit 118 when no noise signal S1 is detected.

[0025] The hardware structure of the driving circuit 110 and the display panel 120 can be referenced from common knowledge in related technologies to obtain sufficient teaching, suggestions and implementation instructions. In addition, in the embodiments, the detection circuit 112 and / or the buffer circuit 116 can be independently arranged outside the driving circuit 110.

[0026] Figure 2 This is a schematic diagram illustrating a display panel driven in a column-reversal manner when no noise signal is detected, according to an embodiment of the present invention. Figure 3 The waveform and corresponding polarity of the pixel voltage when no noise signal is detected are shown in the embodiments of the present invention.

[0027] Please refer to Figures 1 to 3 Frames F1 to F4 are four consecutive frames. Pixel voltage Vp_A0 drives pixel 201A, and pixel voltage Vp_B0 drives pixel 201B. Pixels 201A and 201B are located in the same even-numbered pixel column in the display panel 120. When no noise signal S1 is detected, the polarities of pixel voltages Vp_A0 and Vp_B0 alternate during the four consecutive frames F1 to F4. In this embodiment, since no noise signal S1 is detected, the counter circuit 118 does not stop counting frame values. The source drive circuit 114 outputs pixel voltage Vp_A0, which has different polarities in frames F2 and F3. Similarly, pixel voltage Vp_B0 also has different polarities in frames F2 and F3.

[0028] Figure 4 This is a schematic diagram illustrating how a display panel is driven in a column-reversal manner when a noise signal is detected, according to an embodiment of the present invention. Figure 5 The waveform and corresponding polarity of the pixel voltage when a noise signal is detected are shown in the embodiments of the present invention.

[0029] Please refer to Figure 1 , Figure 4 and Figure 5 When noise signal S1 is detected in frame F2, counter circuit 118 stops counting frame values. In this embodiment, source drive circuit 114 outputs pixel voltages with the same polarity in the current frame and the previous frame.

[0030] The pixel voltage Vp_A1 is used to drive pixel 201A. Taking frame F3 as the current frame and frame F2 as the previous frame of F3, the source drive circuit 114 outputs a pixel voltage Vp_A1 with the same positive polarity in both the current frame F3 and the previous frame F2. The positive pixel voltage Vp_A1 remains unchanged between the two frames.

[0031] The pixel voltage Vp_B1 is used to drive pixel 201B. Taking frame F2 as the current frame and frame F1 as the previous frame of the current frame F2, the source drive circuit 114 outputs a pixel voltage Vp_B1 with the same negative polarity in both the current frame F2 and the previous frame F1. The negative pixel voltage Vp_B1 remains unchanged between the two frames.

[0032] Figure 6 This is a schematic diagram illustrating a display panel driven in a frame-inverted manner when no noise signal is detected, according to an embodiment of the present invention. Figure 7 The waveform and corresponding polarity of the pixel voltage when no noise signal is detected are shown in the embodiments of the present invention.

[0033] Please refer to Figure 1 , Figure 6 and Figure 7 When no noise signal S1 is detected, the polarities of pixel voltage Vp_A2 driving pixel 201A and Vp_B2 driving pixel 201B alternate during four consecutive frames F1 to F4. In this embodiment, since no noise signal S1 is detected, the counter circuit 118 does not stop counting frame values. The source drive circuit 114 outputs pixel voltage Vp_A2, which has different polarities in frames F2 and F3. Similarly, pixel voltage Vp_B2 also has different polarities in frames F2 and F3.

[0034] Figure 8 This is a schematic diagram illustrating a display panel driven in a frame-inverted manner when a noise signal is detected, according to an embodiment of the present invention. Figure 9 The waveform and corresponding polarity of the pixel voltage when a noise signal is detected are shown in the embodiments of the present invention.

[0035] Please refer to Figure 1 , Figure 8 and Figure 9When noise signal S1 is detected in frame F2, counter circuit 118 stops counting frame values. For pixel voltage Vp_A3 used to drive pixel 201A, source drive circuit 114 outputs pixel voltage Vp_A3 with the same positive polarity in the current frame F3 and the previous frame F2. For pixel voltage Vp_B3 used to drive pixel 201B, source drive circuit 114 outputs pixel voltage Vp_B3 with the same negative polarity in the current frame F2 and the previous frame F1.

[0036] Furthermore, the driving method for point reversal can be deduced in the same way, so it will not be elaborated further.

[0037] Figure 10 This is a flowchart illustrating the driving method according to an embodiment of the present invention. Please refer to... Figure 1 and Figure 10 , Figure 10 The driving method is at least suitable for Figure 1 The present invention is not limited to the display device 100. Taking the display device 100 as an example, in step S100, the detection circuit 112 receives the data signal Vd from the video source TX via the connection line 200 and detects the noise signal S1 on the connection line 200. In step S110, when the noise signal S1 is detected, the source driving circuit 114 outputs a pixel voltage Vp with the same polarity in the current frame and the previous frame to drive the display panel 120.

[0038] The driving method of this invention can be implemented in... Figures 1 to 9 The examples shown provide sufficient teaching, suggestions and implementation instructions, and therefore will not be repeated here.

[0039] In summary, in the embodiments of the present invention, when a noise signal is detected, the driving circuit stops counting frame values ​​and outputs pixel voltages with the same polarity in the current frame and the previous frame to drive the display panel.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A driving method for driving a display panel to display an image, the driving method comprising: Data signals from a video source are received via a connection line, and noise signals on the connection line are detected. as well as When the noise signal is detected, pixel voltages with the same polarity are output in the current frame and the previous frame to drive the display panel.

2. The driving method according to claim 1 further includes: Count frame values ​​based on the vertical synchronization signal; as well as When the noise signal is detected, the counting of the frame values ​​is stopped.

3. The driving method according to claim 2 further includes: Set the flag to a first value to indicate that the noise signal has been detected; as well as Set the flag to a second value to indicate that the noise signal was not detected.

4. The driving method according to claim 3 further includes: When the flag is set to the first value, a pixel voltage with the same polarity as the previous frame is generated in the current frame.

5. The driving method according to claim 1, further comprising: The display panel is driven in a column-reversed manner.

6. The driving method according to claim 1, further comprising: The display panel is driven in a frame-inverted manner.

7. The driving method according to claim 1, further comprising: The display panel is driven in a dot-inverted manner.

8. A driving circuit for driving a display panel to display an image, the driving circuit comprising: A detection circuit is coupled to a video source via a connecting line and is used to receive data signals from the video source via the connecting line and to detect noise signals on the connecting line. as well as A source driving circuit is coupled to the detection circuit and used to output pixel voltage to drive the display panel, wherein when the noise signal is detected, the pixel voltage has the same polarity in the current frame and the previous frame.

9. The driving circuit according to claim 8 further includes: A buffer circuit, coupled to the detection circuit, is used to store a flag indicating whether the noise signal has been detected.

10. The driving circuit according to claim 9, further comprising: A counter circuit, coupled to the detection circuit and the buffer circuit, is used to count frame values ​​based on the vertical synchronization signal and to stop counting the frame values ​​when the noise signal is detected.

11. The driving circuit of claim 9, wherein the flag is set to a first value to indicate that the noise signal is detected, and the flag is set to a second value to indicate that the noise signal is not detected.

12. The driving circuit of claim 9, wherein when the flag is set to the first value, the source driving circuit generates the pixel voltage having the same polarity as the previous frame in the current frame.

13. The driving circuit according to claim 8, wherein the source driving circuit drives the display panel in a column-inverting manner.

14. The driving circuit according to claim 8, wherein the source driving circuit drives the display panel in a frame inversion manner.

15. The driving circuit according to claim 8, wherein the source driving circuit drives the display panel in a dot-inverting manner.

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