Compensation module, compensation method and display device

Abstract

The invention provides a compensation module, a compensation method and a display device. The compensation module is applied to the display panel, and the display panel comprises a common electrode layer. The compensation module comprises a compensation circuit and a power supply control circuit; when a corresponding power supply voltage is connected to a power supply end, the compensation circuit obtains an output common electrode voltage according to a compensation common electrode voltage provided by a feedback node, and provides the output common electrode voltage to an output node; under the control of the power supply control signal, the power supply control circuit stops providing the power supply voltage to the power supply end in at least part of time in a blank time period between two frames of display time, and provides the power supply voltage to the power supply end in one frame of display time; the feedback node is a node on the common electrode layer, the output node is a node on the common electrode layer, and the feedback node and the output node are different nodes. According to the invention, the power consumption caused by common electrode voltage compensation can be effectively reduced on the premise of improving the picture quality.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a compensation module, a compensation method and a display device. Background Art

[0002] In the related art, during the process of charging the pixel through the data voltage on the data line, the common electrode voltage VCOM will be pulled due to capacitive coupling, and the actual display brightness of the pixel is related to the voltage difference between the data voltage and VCOM, so the fluctuation of VCOM will affect the actual pixel display. In order to minimize the image quality problems caused by the pulling of VCOM, the column-oriented pixel charging flipping method is usually used. The polarities of the adjacent column pixels in the same row are opposite, and the pulling direction of VCOM is opposite during charging, which reduces the fluctuation of the VCOM level. However, for some user-specific usage scenarios, such as Excel tables, the table frame line selects a dotted line. For the Line where the horizontal frame line is located, when the column is flipped, the light displayed in the same frame is of the same polarity, while the dark is of another polarity, and the coupling can hardly be reduced. At this time, the VCOM level will be pulled violently; when the user opens the Windows start menu page in the dark theme, he will see a horizontal dotted line running through the start menu at the frame line; in order to avoid the image quality problem caused by the pulling of VCOM, the existing Panel will reserve a VCOM compensation line when designing, leading it from the midpoint of the Panel to the OP (operational amplifier) ​​IC (integrated circuit) located on the PCB (Printed Circuit Board), and the OP IC reversely compensates and amplifies to generate a compensation common electrode voltage to the display panel, so as to achieve the purpose of remote compensation of the midpoint feedback of the VCOM fluctuation; this compensation method of installing an OP IC on the PCB will lead to an increase in power consumption; the more violently VCOM is pulled, the higher the set magnification is, and the more power consumption caused by the OP IC increases. The existing VCOM compensation is performed all the time, and there are redundant VCOM compensation actions during the blank time period; and by adopting this compensation method, the compensation ratio of VCOM is constant, and the pure color picture will not have image quality problems caused by VCOM pulling. The above two application scenarios will cause the problem of increased power consumption. Summary of the invention

[0003] The main purpose of the present invention is to provide a compensation module, a compensation method and a display device to solve the problem in the prior art that the power consumption caused by the common electrode voltage VCOM compensation cannot be effectively reduced while improving the picture quality.

[0004] In one aspect, an embodiment of the present invention provides a compensation module, which is applied to a display panel, wherein the display panel includes a common electrode layer; the compensation module includes a compensation circuit and a power supply control circuit;

[0005] The compensation circuit is electrically connected to the power supply end, the feedback node and the output node respectively, and is used to obtain the output common electrode voltage according to the compensation common electrode voltage provided by the feedback node when the power supply end is connected to the corresponding power supply voltage, and provide the output common electrode voltage to the output node;

[0006] The power supply control circuit is electrically connected to the power supply end and the power supply control end respectively, and is used to stop supplying the power supply voltage to the power supply end during at least part of the blank time period between two frames of display time under the control of the power supply control signal provided by the power supply control end, and to provide the power supply voltage to the power supply end during one frame of display time;

[0007] The feedback node is a node on the common electrode layer, the output node is a node on the common electrode layer, and the feedback node and the output node are different nodes.

[0008] Optionally, the compensation circuit includes a compensation operational amplifier; the power supply end includes a first power supply end and a second power supply end;

[0009] The first power supply terminal is electrically connected to the ground terminal of the compensation operational amplifier, and the second power supply terminal is electrically connected to the power supply voltage terminal of the compensation operational amplifier;

[0010] The power supply control circuit includes a first switch circuit and a second switch circuit;

[0011] The first switch circuit is electrically connected to the power supply control terminal, the first voltage terminal and the first power supply terminal respectively, and is used to control the first voltage terminal to be disconnected from the first power supply terminal during at least part of the blank time period under the control of the power supply control signal, and to control the first voltage terminal to be connected to the first power supply terminal during a frame display time;

[0012] The second switching circuit is electrically connected to the power supply control terminal, the second voltage terminal and the second power supply terminal, respectively, and is used to control the second voltage terminal and the second power supply terminal to be disconnected during at least part of the blank time period under the control of the power supply control signal, and to control the second voltage terminal and the second power supply terminal to be connected during a frame display time.

[0013] Optionally, the first switch circuit includes a first switch transistor, and the second switch circuit includes a second switch transistor;

[0014] The gate of the first switch transistor is electrically connected to the power supply control terminal, the first electrode of the first switch transistor is electrically connected to the first voltage terminal, and the second electrode of the first switch transistor is electrically connected to the first power supply terminal;

[0015] A gate of the second switch transistor is electrically connected to the power supply control terminal, a first electrode of the second switch transistor is electrically connected to the second voltage terminal, and a second electrode of the second switch transistor is electrically connected to the second power supply terminal.

[0016] Optionally, the power supply control terminal is a frame reset terminal.

[0017] Optionally, the common electrode layer has a first side, a second side and a third side;

[0018] The first side is a side close to the driving integrated circuit, the second side is adjacent to the first side, and the third side is adjacent to the first side; the second side and the third side are opposite sides;

[0019] The feedback nodes include a first feedback node and a second feedback node, and the output nodes include a first output node and a second output node;

[0020] The first feedback node and the first output node are arranged on the first side, and the second feedback node and the second output node are arranged on the second side;

[0021] The shortest distance between the first output node and the first side is greater than the shortest distance between the first feedback node and the first side;

[0022] The shortest distance between the second output node and the first side is greater than the shortest distance between the second feedback node and the first side.

[0023] Optionally, the common electrode layer has a first side, a second side and a third side;

[0024] The first side is a side on which a driving integrated circuit is disposed, the second side is adjacent to the first side, and the third side is adjacent to the first side; the second side and the third side are opposite sides;

[0025] The feedback node is arranged on the second side or the third side, and the output node is arranged on the second side or the third side;

[0026] The shortest distance between the output node and the first side is greater than the shortest distance between the feedback node and the first side.

[0027] Optionally, the compensation circuit further includes a first capacitor, a first resistor and a second resistor;

[0028] The non-inverting input terminal of the compensation operational amplifier is electrically connected to the input node;

[0029] A first end of the first capacitor is electrically connected to the feedback node, a second end of the first capacitor is electrically connected to a first end of the first resistor, and a second end of the first resistor is electrically connected to a first end of the second resistor;

[0030] The inverting input terminal of the compensation operational amplifier is electrically connected to the second end of the first resistor, and the output terminal of the compensation operational amplifier is electrically connected to the output node;

[0031] The resistance value of the first resistor and the resistance value of the second resistor are adjustable;

[0032] The input node is a node on the common electrode layer, the input node and the feedback node are different nodes, and the input node and the output node are different nodes.

[0033] Optionally, the common electrode layer has a first side edge; the first side edge is a side edge close to the driving integrated circuit;

[0034] The input node is arranged on the first side.

[0035] The embodiment of the present invention further provides a compensation method, which is applied to the above-mentioned compensation module, and the compensation method includes:

[0036] During a frame display time, the power supply control circuit provides a power supply voltage to the power supply terminal, and the compensation circuit obtains an output common electrode voltage according to the compensation common electrode voltage provided by the feedback node, and provides the output common electrode voltage to the output node;

[0037] During at least part of the blank period between two display frames, the power supply control circuit stops providing the power supply voltage to the power supply terminal, and the compensation circuit stops working.

[0038] An embodiment of the present invention further provides a display device, including a display panel, wherein the display panel includes a common electrode layer; the display device also includes the above-mentioned compensation module.

[0039] The display device described in at least one embodiment of the present invention further includes a driver integrated circuit; the compensation module is integrated in the driver integrated circuit; the driver integrated circuit includes an adjustment module; the compensation circuit in the compensation module further includes a first capacitor, a first resistor and a second resistor;

[0040] The adjustment module is used to adjust the resistance value of the first resistor and / or the resistance value of the second resistor according to the current display picture.

[0041] Optionally, the adjustment module is used to increase the ratio of the resistance value of the second resistor to the resistance value of the first resistor when the currently displayed image is a crosstalk image, and to decrease the ratio of the resistance value of the second resistor to the resistance value of the first resistor when the currently displayed image is a pure color image.

[0042] The display device described in at least one embodiment of the present invention further includes a timing controller and a source driver;

[0043] The timing controller is used to provide a data voltage control signal to the source driver within a frame display time, so that the source driver outputs a corresponding data voltage, and is also used to stop providing the data voltage control signal to the source driver during at least part of the time included in the blank time period between two frames of display time, so that at least part of the modules included in the source driver stop working.

[0044] Optionally, the source driver includes a signal receiving module, a digital data voltage providing module and a digital-to-analog conversion module;

[0045] The signal receiving module is used to receive the data voltage control signal and provide the data voltage control signal to the digital data voltage providing module;

[0046] The digital data voltage providing module is used to provide the digital data voltage to the digital-to-analog conversion module according to the data voltage control signal;

[0047] The digital-to-analog conversion module is used to convert the digital data voltage into an analog data voltage;

[0048] The timing controller is used to control the signal receiving module and the digital-to-analog conversion module to stop working during at least part of the time included in the blank time period.

[0049] In the compensation module, compensation method and display device described in the embodiments of the present invention, the power supply control circuit stops providing the power supply voltage to the power supply end at least part of the time in the blank time period, and the compensation circuit does not perform common electrode voltage compensation; the power supply control circuit provides the power supply voltage to the power supply end during a frame display time period, and the compensation circuit does not perform common electrode voltage compensation, so as to effectively reduce the power consumption caused by the common electrode voltage VCOM compensation while improving the picture quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 is a circuit diagram of a compensation module according to an embodiment of the present invention;

[0051] Figure 2 is an operation timing diagram of at least one embodiment of a display device;

[0052] Figure 3 is a circuit diagram of a compensation module according to at least one embodiment of the present invention;

[0053] Figure 4 is a circuit diagram of a compensation module according to at least one embodiment of the present invention;

[0054] Figure 5 is a schematic diagram of setting a feedback node and an output node on a common electrode layer;

[0055] Figure 6 is a structural diagram of a display device according to at least one embodiment of the present invention;

[0056] Figure 7 is a structural diagram of a display device according to at least one embodiment of the present invention;

[0057] Figure 8 is a structural diagram of at least one embodiment of a source driver. DETAILED DESCRIPTION

[0058] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0059] The transistors used in all embodiments of the present invention may be thin film transistors or field effect transistors or other devices with the same characteristics. In the embodiments of the present invention, to distinguish the two electrodes of the transistor except the gate, one electrode is called the first electrode and the other electrode is called the second electrode.

[0060] In actual operation, when the transistor is a thin film transistor or a field effect transistor, the first electrode may be a drain electrode, and the second electrode may be a source electrode; or, the first electrode may be a source electrode, and the second electrode may be a drain electrode.

[0061] The compensation module described in the embodiment of the present invention is applied to a display panel, and the display panel includes a common electrode layer; Figure 1 As shown, the compensation module includes a compensation circuit 11 and a power supply control circuit 12;

[0062] The compensation circuit 11 is electrically connected to the power supply terminal VP, the feedback node VCOM_FEED and the output node VCOM_OUT respectively, and is used to obtain an output common electrode voltage according to the compensation common electrode voltage provided by the feedback node VCOM_FEED when the power supply terminal VP is connected to the corresponding power supply voltage, and provide the output common electrode voltage to the output node VCOM_OUT;

[0063] The power supply control circuit 12 is electrically connected to the power supply terminal VP and the power supply control terminal Ctrl respectively, and is used to stop supplying the power supply voltage to the power supply terminal VP during at least part of the blank time period between two frames of display time under the control of the power supply control signal provided by the power supply control terminal Ctrl, and to provide the power supply voltage to the power supply terminal VP during one frame of display time;

[0064] The feedback node VCOM_FEED is a node on the common electrode layer, the output node VCOM_OUT is a node on the common electrode layer, and the feedback node VCOM_FEED and the output node VCOM_OUT are different nodes.

[0065] An embodiment of the present invention provides a compensation module, which includes a compensation circuit and a power supply control circuit; the power supply control circuit stops providing a power supply voltage to a power supply end at least part of the time in a blank time period, and the compensation circuit does not perform common electrode voltage compensation; the power supply control circuit provides a power supply voltage to the power supply end in a frame display time period, and the compensation circuit does not perform common electrode voltage compensation, so as to effectively reduce the power consumption caused by the common electrode voltage VCOM compensation while improving the picture quality.

[0066] In a specific implementation, the fluctuation of VCOM is caused by pixel charging coupling. During the blank time period, the pixels are not charged and there is no need to compensate VCOM during the blank time period. Therefore, at least one embodiment of the present invention turns off the VCOM compensation function during the blank time period between two frames of display time to achieve the purpose of reducing power consumption.

[0067] like Figure 2 As shown, the time labeled FN is the Nth frame display time, the time labeled FN+1 is the N+1th frame display time, and the time labeled TB is the blank time period set between FN and FN+1;

[0068] During at least part of the blank time period TB, the frame reset signal provided by the frame reset terminal STV0 is a high voltage signal, and during the Nth frame display time FN and the N+1th frame display time FN+1, the frame reset signal provided by the frame reset terminal STV0 is a low voltage signal; in at least one embodiment of the present invention, the frame reset signal provided by STV0 can be used as an enable signal to achieve dynamic adjustment between the frame display time and the blank time period.

[0069] exist Figure 2, STV1 is the starting voltage terminal, CLK1 is the first clock signal terminal, CLK2 is the second clock signal terminal, CLK3 is the third clock signal terminal, CLK4 is the fourth clock signal terminal, CLK5 is the fifth clock signal terminal, CLK6 is the sixth clock signal terminal, CLK7 is the seventh clock signal terminal, CLK8 is the eighth clock signal terminal, VGH is the high voltage terminal, VGL is the low voltage terminal, and GCH is the high level terminal.

[0070] Optionally, the power supply control terminal may be a frame reset terminal STV0, but is not limited thereto.

[0071] In at least one embodiment of the present invention, the compensation control circuit may include a compensation operational amplifier for performing common electrode voltage compensation. The compensation operational amplifier may be arranged on a PCB. When a high voltage signal is provided at a frame reset terminal, the power supply voltage is stopped from being provided to the compensation operational amplifier, and the compensation operational amplifier does not work at this time. When a low voltage signal is provided at a frame reset terminal, the power supply voltage is normally provided to the compensation operational amplifier, and the compensation operational amplifier works normally to compensate for the common electrode voltage.

[0072] After actual testing, for a 13.3-inch 60Hz a-Si (amorphous silicon) display product, when displaying a mosaic picture, the compensation method in at least one embodiment of the present invention can save power consumption of about 7mW.

[0073] In at least one embodiment of the present invention, the compensation circuit includes a compensation operational amplifier; the power supply end includes a first power supply end and a second power supply end;

[0074] The first power supply terminal is electrically connected to the ground terminal of the compensation operational amplifier, and the second power supply terminal is electrically connected to the power supply voltage terminal of the compensation operational amplifier;

[0075] The power supply control circuit includes a first switch circuit and a second switch circuit;

[0076] The first switch circuit is electrically connected to the power supply control terminal, the first voltage terminal and the first power supply terminal respectively, and is used to control the first voltage terminal to be disconnected from the first power supply terminal during at least part of the blank time period under the control of the power supply control signal, and to control the first voltage terminal to be connected to the first power supply terminal during a frame display time;

[0077] The second switching circuit is electrically connected to the power supply control terminal, the second voltage terminal and the second power supply terminal, respectively, and is used to control the second voltage terminal and the second power supply terminal to be disconnected during at least part of the blank time period under the control of the power supply control signal, and to control the second voltage terminal and the second power supply terminal to be connected during a frame display time.

[0078] In a specific implementation, the compensation circuit may include a compensation operational amplifier, and the power supply compensation circuit may include a first switching circuit and a second switching circuit. During at least part of the blank time period, the first switching circuit controls the first voltage terminal and the first power supply terminal to be disconnected, and the second switching circuit controls the second voltage terminal and the second power supply terminal to be disconnected. During a frame display time, the first switching circuit controls the first voltage terminal and the first power supply terminal to be connected, and the second switching circuit controls the second voltage terminal and the second power supply terminal to be connected.

[0079] like Figure 3 As shown, the compensation circuit may include a compensation operational amplifier OP1; the power supply end includes a first power supply end AVEE_O and a second power supply end AVDD_O;

[0080] The first power supply terminal AVEE_O is electrically connected to the ground terminal GND of the compensation operational amplifier OP1, and the second power supply terminal AVDD_O is electrically connected to the power supply voltage terminal VDD of the compensation operational amplifier OP;

[0081] The power supply control circuit includes a first switch circuit 31 and a second switch circuit 32;

[0082] The first switch circuit 31 is electrically connected to the power supply control terminal Ctrl, the first voltage terminal AVEE and the first power supply terminal AVEE_O respectively, and is used for controlling the first voltage terminal AVEE to be disconnected from the first power supply terminal AVEE_O at least part of the time in the blank time period under the control of the power supply control signal, and controlling the first voltage terminal AVEE to be connected to the first power supply terminal AVEE_O within a frame display time;

[0083] The second switch circuit 32 is electrically connected to the power supply control terminal Ctrl, the second voltage terminal AVDD and the second power supply terminal AVDD_O, respectively, and is used for controlling the second voltage terminal AVDD and the second power supply terminal AVDD_O to be disconnected during at least part of the blank time period under the control of the power supply control signal, and controlling the second voltage terminal AVDD and the second power supply terminal AVDD_O to be connected during a frame display time.

[0084] exist Figure 3In the figure, NC1 is the first pin of OP1, IN_N is the inverting input terminal of OP1, IN_P is the non-inverting input terminal of OP1, NC is the fifth pin of OP1, OUT_A is the output terminal of OP1, NC2 is the eighth pin of OP1, and E-pad is the ninth pin of OP1.

[0085] Optionally, the first switch circuit includes a first switch transistor, and the second switch circuit includes a second switch transistor;

[0086] The gate of the first switch transistor is electrically connected to the power supply control terminal, the first electrode of the first switch transistor is electrically connected to the first voltage terminal, and the second electrode of the first switch transistor is electrically connected to the first power supply terminal;

[0087] A gate of the second switch transistor is electrically connected to the power supply control terminal, a first electrode of the second switch transistor is electrically connected to the second voltage terminal, and a second electrode of the second switch transistor is electrically connected to the second power supply terminal.

[0088] Optionally, the power supply control terminal is a frame reset terminal.

[0089] like Figure 4 As shown, in Figure 3 Based on at least one embodiment of the compensation module shown, the first switch circuit includes a first switch transistor T1, and the second switch circuit includes a second switch transistor T2;

[0090] The gate of the first switch transistor T1 is electrically connected to the frame reset terminal STV0, the source of the first switch transistor T1 is electrically connected to the first voltage terminal AVEE, and the drain of the first switch transistor T1 is electrically connected to the first power supply terminal AVEE_O;

[0091] The gate of the second switch transistor T2 is electrically connected to the frame reset terminal STV0, the source of the second switch transistor T2 is electrically connected to the second voltage terminal AVDD, and the drain of the second switch transistor T2 is electrically connected to the second power supply terminal AVDD_O.

[0092] exist Figure 4 In at least one embodiment shown, both T1 and T2 are p-type transistors, and the power supply

[0093] Figure 4 At least one embodiment of the compensation module shown is in operation, during a blank period between two display frames, STV0 provides a high voltage signal, T1 and T2 are turned off, AVEE is disconnected from AVEE_O, AVDD is disconnected from AVDD_O, the supply voltage to OP1 is stopped, and OP1 stops working;

[0094] During one frame display time, STV0 provides a low voltage signal, T1 and T2 are turned on, AVEE is turned on with AVEE_O, AVDD is turned on with AVDD_O, and a power supply voltage is provided to OP1, so that OP1 can perform common electrode voltage compensation.

[0095] Optionally, the compensation circuit may further include a first capacitor, a first resistor and a second resistor;

[0096] The non-inverting input terminal of the compensation operational amplifier is electrically connected to the input node;

[0097] A first end of the first capacitor is electrically connected to the feedback node, a second end of the first capacitor is electrically connected to a first end of the first resistor, and a second end of the first resistor is electrically connected to a first end of the second resistor;

[0098] The inverting input terminal of the compensation operational amplifier is electrically connected to the second end of the first resistor, and the output terminal of the compensation operational amplifier is electrically connected to the output node;

[0099] The resistance value of the first resistor and the resistance value of the second resistor are adjustable;

[0100] The input node is a node on the common electrode layer, the input node and the feedback node are different nodes, and the input node and the output node are different nodes.

[0101] like Figure 3 , Figure 4 As shown, the compensation circuit may further include a first capacitor C1, a first resistor R1 and a second resistor R2;

[0102] The non-inverting input terminal of the compensation operational amplifier OP1 is electrically connected to the input node VCOM_IN;

[0103] The first end of the first capacitor C1 is electrically connected to the feedback node VCOM_FEED, the second end of the first capacitor C1 is electrically connected to the first end of the first resistor R1, and the second end of the first resistor R1 is electrically connected to the first end of the second resistor R2;

[0104] The inverting input terminal of the compensation operational amplifier OP1 is electrically connected to the second end of the first resistor R1, and the output terminal of the compensation operational amplifier OP1 is electrically connected to the output node VCOM_OUT;

[0105] The resistance value of the first resistor R1 and the resistance value of the second resistor R2 are adjustable.

[0106] like Figure 3 , Figure 4As shown, the compensation circuit may further include a second capacitor C2, a third capacitor C3 and a fourth capacitor C4;

[0107] The first end of C2 is electrically connected to VCOM_IN, and the second end of C2 is electrically connected to the ground;

[0108] A first end of C3 is electrically connected to VCOM_IN, and a second end of C3 is electrically connected to the ground;

[0109] A first end of C4 is electrically connected to AVDD_O, and a second end of C4 is electrically connected to the ground.

[0110] The present invention Figure 4 When at least one embodiment of the compensation module shown is working, C1 obtains the AC component in the compensation common electrode voltage provided by VCOM_FEED, OP1 inverts and amplifies the AC component, and provides the output common electrode voltage to VCOM_OUT through the output end of OP1. The amplification factor and compensation ratio are related to R2z / R1z.

[0111] In specific implementation, OP1 can be integrated into the Driver IC (driver integrated circuit), and the signals provided by VCOM_IN, VCOM_FEED and VCOM_OUT need to be pulled into the Driver IC;

[0112] For TED IC (embedding TCON (timing controller) into Driver IC) projects, the frame reset signal provided by STV0 is used as the power supply control signal. When STV0 provides a high voltage signal, AVEE is disconnected from AVEE_O, AVDD is disconnected from AVDD_O, and OP1 does not work; when STV0 provides a low voltage signal, VEE is connected to AVEE_O, AVDD is connected to AVDD_O, and OP1 works normally.

[0113] In at least one embodiment of the present invention, for the design of TCON (timing controller) + Source IC (source driver), turning on TCON VBPAD (Vblanking Power Down) can be used to determine whether the current period is in the display interval or the blanking period; when TCON VBPD is turned on, during the display period, the PP signal (PP signal includes a signal that controls the source driver to provide a corresponding data voltage) is normally transmitted to the source driver, and the compensation operational amplifier operates normally; when entering the blanking period, TCON sends a VBPD asserted (activation) command to the source driver, turns off the TX (transmit) function of TCON, and turns off the compensation operational amplifier, thereby saving power consumption of the compensation operational amplifier during the blanking period.

[0114] The present invention Figure 4 In at least one embodiment of the compensation module shown, when working, the compensation ratio of the common electrode voltage VCOM is determined by the resistance value R1z of R1 and the resistance value R2z of R2, and the compensation ratio is positively correlated with R2z / R1z. The compensation operational amplifier can be integrated into the Driver IC (driver integrated circuit), and R2z / R1z can be adjusted through the code register. The TED IC or TCON can read the data in its internal Line buffer module to identify the currently displayed picture and adjust R2z / R1z according to the current display panel.

[0115] In actual operation, the pure color picture has little effect on the VCOM level, and there will be no image quality problems caused by VCOM pulling. Excessively high VCOM compensation ratio causes waste of dynamic power consumption of the compensation operational amplifier. At this time, it is necessary to control the VCOM compensation ratio according to the actual display screen.

[0116] When the currently displayed screen is an Excel crosstalk screen, for the 1Line where the horizontal frame line is located, the light displayed in the same frame when the column is flipped is of the same polarity, while the dark is of another polarity, which can hardly reduce the coupling. At this time, the VCOM level will be pulled violently. When the user opens the Windows start menu page under the dark main body, he will see a horizontal dotted line running through the start menu at the frame line; when the pixel arrangement that causes Excel crosstalk is detected, when the VBPD function is turned on, after the power down mode ends, a command containing the VCOM compensation ratio is sent to the Source IC, and the Source IC adjusts R2z / R1z before the next frame starts to increase the VCOM compensation ratio and improve the picture quality. When the preset pixel arrangement is not detected, the VCOM ratio is reduced by adjusting R2z / R1z; this method of adjusting the VCOM compensation ratio according to the actual display screen can effectively reduce the dynamic power consumption of the compensation module under light load & pure color screens while improving the picture quality.

[0117] In at least one embodiment of the present invention, the common electrode layer has a first side, a second side and a third side;

[0118] The first side is a side close to the driving integrated circuit, the second side is adjacent to the first side, and the third side is adjacent to the first side; the second side and the third side are opposite sides;

[0119] The feedback nodes include a first feedback node and a second feedback node, and the output nodes include a first output node and a second output node;

[0120] The first feedback node and the first output node are arranged on the first side, and the second feedback node and the second output node are arranged on the second side;

[0121] The shortest distance between the first output node and the first side is greater than the shortest distance between the first feedback node and the first side;

[0122] The shortest distance between the second output node and the first side is greater than the shortest distance between the second feedback node and the first side.

[0123] In at least one embodiment of the present invention, the common electrode layer has a first side edge; the first side edge is a side edge close to the driving integrated circuit;

[0124] The input node is arranged on the first side.

[0125] Optionally, the first side may be a lower side, the second side may be a left side, and the third side may be a right side, the lower side is adjacent to the left side, the lower side is adjacent to the right side, and the left side and the right side are opposite sides;

[0126] like Figure 5 As shown, the first feedback node NF1 and the first output node NP1 are arranged on the left side, the second feedback node NF2 and the second output node NP2 are arranged on the right side, the shortest distance between the first output node NP1 and the lower side is greater than the shortest distance between the first feedback node NF1 and the lower side, and the shortest distance between the second output node NP2 and the lower side is greater than the shortest distance between the second feedback node NF2 and the lower side;

[0127] The first input node NI1 , the second input node NI2 , and the third input node NI3 may be disposed at the lower side.

[0128] exist Figure 5 In at least one embodiment shown, the output nodes and the feedback nodes may be symmetrically arranged on the left side and the right side.

[0129] exist Figure 5 In the figure, the common electrode layer is labeled VCM.

[0130] In at least one embodiment of the present invention, the common electrode layer has a first side, a second side and a third side;

[0131] The first side is a side on which a driving integrated circuit is disposed, the second side is adjacent to the first side, and the third side is adjacent to the first side; the second side and the third side are opposite sides;

[0132] The feedback node is arranged on the second side or the third side, and the output node is arranged on the second side or the third side;

[0133] The shortest distance between the output node and the first side is greater than the shortest distance between the feedback node and the first side.

[0134] In a specific implementation, the first side may be a lower side, the second side may be a left side, and the third side may be a right side, the lower side is adjacent to the left side, the lower side is adjacent to the right side, and the left side and the right side are opposite sides; the feedback node may be set on the left side or the right side, and the output node may be set on the left side or the right side; the shortest distance between the output node and the lower side may be greater than the shortest distance between the feedback node and the lower side.

[0135] The compensation method described in the embodiment of the present invention is applied to the above-mentioned compensation module, and the compensation method includes:

[0136] During a frame display time, the power supply control circuit provides a power supply voltage to the power supply terminal, and the compensation circuit obtains an output common electrode voltage according to the compensation common electrode voltage provided by the feedback node, and provides the output common electrode voltage to the output node;

[0137] During at least part of the blank period between two display frames, the power supply control circuit stops providing the power supply voltage to the power supply terminal, and the compensation circuit stops working.

[0138] An embodiment of the present invention provides a compensation method, wherein the power supply control circuit stops providing the power supply voltage to the power supply end at least part of the time in the blank time period, and the compensation circuit does not perform common electrode voltage compensation; the power supply control circuit provides the power supply voltage to the power supply end during a frame display time period, and the compensation circuit does not perform common electrode voltage compensation, so as to effectively reduce the problem of a substantial increase in power consumption caused by the common electrode voltage VCOM compensation while improving the picture quality.

[0139] The display device described in the embodiment of the present invention includes a display panel, and the display panel includes a common electrode layer; the display device also includes the above-mentioned compensation module.

[0140] The display device described in at least one embodiment of the present invention further includes a driver integrated circuit; the compensation module is integrated in the driver integrated circuit; the driver integrated circuit includes an adjustment module; the compensation circuit in the compensation module further includes a first capacitor, a first resistor and a second resistor;

[0141] The adjustment module is used to adjust the resistance value of the first resistor and / or the resistance value of the second resistor according to the current display picture.

[0142] In a specific implementation, the display device may include a driver integrated circuit, the compensation module may be integrated into the driver integrated circuit, and the driver integrated circuit may include an adjustment module. The adjustment module may adjust the VCOM compensation ratio by adjusting the resistance value of the first resistor and / or the resistance value of the second resistor according to the current display screen.

[0143] In at least one embodiment of the present invention, the adjustment module is used to increase the ratio of the resistance value of the second resistor to the resistance value of the first resistor when the currently displayed image is a crosstalk image, and to decrease the ratio of the resistance value of the second resistor to the resistance value of the first resistor when the currently displayed image is a pure color image.

[0144] In a specific implementation, when the currently displayed image is a crosstalk image, the ratio of the resistance value of the second resistor to the resistance value of the first resistor is increased to improve the VCOM compensation ratio. When the currently displayed image is a pure color image, the ratio of the resistance value of the second resistor to the resistance value of the first resistor is decreased to reduce the VCOM compensation ratio.

[0145] like Figure 6 As shown, the display device according to at least one embodiment of the present invention further includes a timing controller 61 and a source driver 62;

[0146] The timing controller 61 is electrically connected to the source driver 62, and is used to provide a data voltage control signal to the source driver 62 within a frame display time, so that the source driver 62 outputs a corresponding data voltage, and is also used to stop providing the data voltage control signal to the source driver 62 during at least part of the time included in the blank time period between two frames of display time, so that at least part of the modules included in the source driver 62 stop working.

[0147] In a specific implementation, the display device may further include a timing controller and a source driver. During one frame of display time, the timing controller provides a data voltage control signal to the source driver so that the source driver outputs a corresponding data voltage. During at least part of the time included in the blank time period between two frames of display time, the timing controller stops providing the data voltage control signal to the source driver so that at least some of the modules included in the source driver stop working.

[0148] In at least one embodiment of the present invention, the source driver includes a signal receiving module, a digital data voltage providing module and a digital-to-analog conversion module;

[0149] The signal receiving module is used to receive the data voltage control signal and provide the data voltage control signal to the digital data voltage providing module;

[0150] The digital data voltage providing module is used to provide the digital data voltage to the digital-to-analog conversion module according to the data voltage control signal;

[0151] The digital-to-analog conversion module is used to convert the digital data voltage into an analog data voltage;

[0152] The timing controller is used to control the signal receiving module and the digital-to-analog conversion module to stop working during at least part of the time included in the blank time period.

[0153] In a specific implementation, the source driver may include a signal receiving module, a digital data voltage providing module and a digital-to-analog conversion module; the signal receiving module receives the data voltage control signal, and provides the data voltage control signal to the digital data voltage providing module; the digital data voltage providing module provides the digital data voltage to the digital-to-analog conversion module according to the data voltage control signal; the digital-to-analog conversion module converts the digital data voltage into an analog data voltage; the timing controller controls the signal receiving module and the digital-to-analog conversion module to stop working during at least part of the time included in the blank time period.

[0154] like Figure 7 As shown, based on at least one embodiment shown in the figure, the source driver includes a signal receiving module 71, a digital data voltage providing module 72 and a digital-to-analog conversion module 73;

[0155] The signal receiving module 71 is electrically connected to the digital data voltage providing module 72, and is used to receive the data voltage control signal and provide the data voltage control signal to the digital data voltage providing module 72;

[0156] The digital data voltage providing module 72 is electrically connected to the digital-to-analog conversion module 73, and is used to provide the digital data voltage to the digital-to-analog conversion module 73 according to the data voltage control signal;

[0157] The digital-to-analog conversion module 73 is used to convert the digital data voltage into an analog data voltage;

[0158] The timing controller 61 is electrically connected to the signal receiving module 71 and the digital-to-analog conversion module 73 respectively, and is used to control the signal receiving module 71 and the digital-to-analog conversion module 73 to stop working during at least part of the time included in the blank time period.

[0159] Figure 8 is a structural diagram of at least one embodiment of a source driver.

[0160] exist Figure 8 In the embodiment, the signal receiving module includes a decoder CDR, which is used to receive a data voltage control signal provided by TCON, and provide the data voltage control signal to a serial-to-parallel converter SPC included in the digital data voltage providing module;

[0161] The digital data voltage supply module includes a serial-to-parallel converter SPC, a bidirectional shift register BSR, a line buffer module LB and a level converter LS;

[0162] The digital-to-analog conversion module includes a digital-to-analog converter DAC, a buffer BF and an output multiplexer OMP.

[0163] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A compensation module, applied to a display panel, wherein the display panel comprises a common electrode layer; characterized in that: The compensation module includes a compensation circuit and a power supply control circuit; The compensation circuit is electrically connected to the power supply end, the feedback node and the output node respectively, and is used to obtain the output common electrode voltage according to the compensation common electrode voltage provided by the feedback node when the power supply end is connected to the corresponding power supply voltage, and provide the output common electrode voltage to the output node; The power supply control circuit is electrically connected to the power supply end and the power supply control end respectively, and is used to stop supplying the power supply voltage to the power supply end during at least part of the blank time period between two frames of display time under the control of the power supply control signal provided by the power supply control end, and to provide the power supply voltage to the power supply end during one frame of display time; The feedback node is a node on the common electrode layer, the output node is a node on the common electrode layer, and the feedback node and the output node are different nodes.

2. The compensation module according to claim 1, characterized in that: The compensation circuit includes a compensation operational amplifier; the power supply end includes a first power supply end and a second power supply end; The first power supply terminal is electrically connected to the ground terminal of the compensation operational amplifier, and the second power supply terminal is electrically connected to the power supply voltage terminal of the compensation operational amplifier; The power supply control circuit includes a first switch circuit and a second switch circuit; The first switch circuit is electrically connected to the power supply control terminal, the first voltage terminal and the first power supply terminal respectively, and is used to control the first voltage terminal to be disconnected from the first power supply terminal during at least part of the blank time period under the control of the power supply control signal, and to control the first voltage terminal to be connected to the first power supply terminal during a frame display time; The second switching circuit is electrically connected to the power supply control terminal, the second voltage terminal and the second power supply terminal, respectively, and is used to control the second voltage terminal and the second power supply terminal to be disconnected during at least part of the blank time period under the control of the power supply control signal, and to control the second voltage terminal and the second power supply terminal to be connected during a frame display time.

3. The compensation module according to claim 2, characterized in that: The first switch circuit includes a first switch transistor, and the second switch circuit includes a second switch transistor; The gate of the first switch transistor is electrically connected to the power supply control terminal, the first electrode of the first switch transistor is electrically connected to the first voltage terminal, and the second electrode of the first switch transistor is electrically connected to the first power supply terminal; A gate of the second switch transistor is electrically connected to the power supply control terminal, a first electrode of the second switch transistor is electrically connected to the second voltage terminal, and a second electrode of the second switch transistor is electrically connected to the second power supply terminal.

4. The compensation module according to any one of claims 1 to 3, characterized in that: The power supply control terminal is a frame reset terminal.

5. The compensation module according to any one of claims 1 to 3, characterized in that: The common electrode layer has a first side, a second side and a third side; The first side is a side close to the driving integrated circuit, the second side is adjacent to the first side, and the third side is adjacent to the first side; the second side and the third side are opposite sides; The feedback nodes include a first feedback node and a second feedback node, and the output nodes include a first output node and a second output node; The first feedback node and the first output node are arranged on the first side, and the second feedback node and the second output node are arranged on the second side; The shortest distance between the first output node and the first side is greater than the shortest distance between the first feedback node and the first side; The shortest distance between the second output node and the first side is greater than the shortest distance between the second feedback node and the first side.

6. The compensation module according to any one of claims 1 to 3, characterized in that: The common electrode layer has a first side, a second side and a third side; The first side is a side on which a driving integrated circuit is disposed, the second side is adjacent to the first side, and the third side is adjacent to the first side; the second side and the third side are opposite sides; The feedback node is arranged on the second side or the third side, and the output node is arranged on the second side or the third side; The shortest distance between the output node and the first side is greater than the shortest distance between the feedback node and the first side.

7. The compensation module according to claim 2 or 3, characterized in that: The compensation circuit further includes a first capacitor, a first resistor and a second resistor; The non-inverting input terminal of the compensation operational amplifier is electrically connected to the input node; A first end of the first capacitor is electrically connected to the feedback node, a second end of the first capacitor is electrically connected to a first end of the first resistor, and a second end of the first resistor is electrically connected to a first end of the second resistor; The inverting input terminal of the compensation operational amplifier is electrically connected to the second end of the first resistor, and the output terminal of the compensation operational amplifier is electrically connected to the output node; The resistance value of the first resistor and the resistance value of the second resistor are adjustable; The input node is a node on the common electrode layer, the input node and the feedback node are different nodes, and the input node and the output node are different nodes.

8. The compensation module according to claim 7, characterized in that: The common electrode layer has a first side edge; the first side edge is a side edge close to the driving integrated circuit; The input node is arranged on the first side.

9. A compensation method, applied to the compensation module according to any one of claims 1 to 8, characterized in that: The compensation method includes: During a frame display time, the power supply control circuit provides a power supply voltage to the power supply terminal, and the compensation circuit obtains an output common electrode voltage according to the compensation common electrode voltage provided by the feedback node, and provides the output common electrode voltage to the output node; During at least part of the blank period between two display frames, the power supply control circuit stops providing the power supply voltage to the power supply terminal, and the compensation circuit stops working.

10. A display device, comprising a display panel, wherein the display panel comprises a common electrode layer; characterized in that: The display device further comprises a compensation module as claimed in any one of claims 1 to 8.

11. The display device according to claim 10, wherein: It also includes a driving integrated circuit; the compensation module is integrated in the driving integrated circuit; the driving integrated circuit includes a regulating module; the compensation circuit in the compensation module also includes a first capacitor, a first resistor and a second resistor; The adjustment module is used to adjust the resistance value of the first resistor and / or the resistance value of the second resistor according to the current display picture.

12. The display device according to claim 11, wherein: The adjustment module is used to increase the ratio of the resistance value of the second resistor to the resistance value of the first resistor when the current display picture is a crosstalk picture, and to decrease the ratio of the resistance value of the second resistor to the resistance value of the first resistor when the current display picture is a pure color picture.

13. The display device according to claim 11, wherein: Also includes a timing controller and a source driver; The timing controller is used to provide a data voltage control signal to the source driver within a frame display time, so that the source driver outputs a corresponding data voltage, and is also used to stop providing the data voltage control signal to the source driver during at least part of the time included in the blank time period between two frames of display time, so that at least part of the modules included in the source driver stop working.

14. The display device according to claim 13, wherein: The source driver includes a signal receiving module, a digital data voltage providing module and a digital-to-analog conversion module; The signal receiving module is used to receive the data voltage control signal and provide the data voltage control signal to the digital data voltage providing module; The digital data voltage providing module is used to provide the digital data voltage to the digital-to-analog conversion module according to the data voltage control signal; The digital-to-analog conversion module is used to convert the digital data voltage into an analog data voltage; The timing controller is used to control the signal receiving module and the digital-to-analog conversion module to stop working during at least part of the time included in the blank time period.

Images