CN111402830A - Circuit board for signal transmission, display device and driving method thereof - Google Patents
Circuit board for signal transmission, display device and driving method thereof Download PDFInfo
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- CN111402830A CN111402830A CN202010313120.2A CN202010313120A CN111402830A CN 111402830 A CN111402830 A CN 111402830A CN 202010313120 A CN202010313120 A CN 202010313120A CN 111402830 A CN111402830 A CN 111402830A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3607—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
Abstract
A circuit board for signal transmission comprises a plurality of connecting units, each connecting unit is used for connecting a control circuit and a plurality of data driving units; for any one connection unit, the impedances of the connection units between different data driving units and the control circuit are different, so that the gamma reference voltages of the same gray scale received by different data driving units from the control circuit are different. The present disclosure also provides a display device and a driving method thereof.
Description
Technical Field
The present disclosure relates to but not limited to the field of display technologies, and in particular, to a circuit board for signal transmission, a display device and a driving method thereof.
Background
As the field of display applications expands, profile-cut products, such as IWBs (Interactive White boards), tiled screens, electronic signage, and the like, are rapidly being developed and introduced. For large-sized profile cut products, such as UHD (Ultra High Definition) tiled screens of 75 inches, a single-side Gate drive (GOA) circuit is used to reduce the tiling gap. However, due to the large product size, the driving capability of the single-side gate driving circuit is insufficient, and the image quality unevenness such as half-color of the display area is caused by insufficient charging rate.
Disclosure of Invention
The present disclosure provides a circuit board for signal transmission, a display device and a driving method thereof, which can improve a display effect.
In one aspect, the present disclosure provides a circuit board for signal transmission, including a plurality of connection units, each for connecting a control circuit with a plurality of data driving units; for any one connection unit, the impedances of the connection units between different data driving units and the control circuit are different, so that the gamma reference voltages of the same gray scale received by different data driving units from the control circuit are different.
In another aspect, the present disclosure provides a display device including: the display device comprises a plurality of regularly arranged display units, a plurality of scanning lines, a plurality of data lines, a grid drive circuit, a control circuit, a plurality of data drive units and at least one circuit board for signal transmission, wherein the display units, the scanning lines, the data lines, the grid drive circuit, the control circuit, the data drive units and the circuit board are arranged in a regular mode; the display unit is positioned in a sub-pixel area formed by the intersection of the scanning lines and the data lines; the grid driving circuit provides grid driving signals for the display units through the scanning lines, and the data driving units provide data signals for the display units through the data lines; the gate driving circuit is located at one side of the plurality of display units in a direction parallel to the plurality of scanning lines, and the plurality of data driving units are located at one side of the plurality of display units in a direction parallel to the plurality of data lines; the circuit board is used for connecting the control circuit and the plurality of data driving units.
In another aspect, the present disclosure provides a driving method of a display device, applied to the display device as described above, the driving method including: each data driving unit receives a plurality of gamma reference voltages from the control circuit through the circuit board for signal transmission, wherein the gamma reference voltages of the same gray scale received by different data driving units are different; each data driving unit provides data signals for the data lines according to the gamma reference voltage, so that the data voltages of the data signals with the same gray scale received by the display units in the same row and different columns are different.
The circuit board for signal transmission provided by the disclosure realizes that the gamma reference voltages of the same gray scale received by different data driving units are different by designing different impedances of the connecting units between the different data driving units and the control circuit, so that the data driving units are utilized to generate different data voltages under the same gray scale, the problem of uneven display caused by unilateral gate driving is solved, and the display effect is improved.
Additional features and advantages of the disclosure will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the disclosure. Other advantages of the disclosure may be realized and attained by the instrumentalities and combinations particularly pointed out in the specification and the drawings.
Drawings
The accompanying drawings are included to provide an understanding of the disclosed embodiments and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the examples serve to explain the principles of the disclosure and not to limit the disclosure.
FIG. 1 is a schematic diagram of a large-sized display device with a special-shaped cut;
fig. 2 is a diagram illustrating an example of charging of a display unit of the display device shown in fig. 1;
fig. 3 is an exemplary diagram of a circuit board for signal transmission according to at least one embodiment of the present disclosure;
fig. 4 is another example diagram of a circuit board for signal transmission according to at least one embodiment of the present disclosure;
fig. 5 is an exemplary diagram of a display device according to at least one embodiment of the present disclosure;
FIG. 6 is a diagram illustrating gamma reference voltages of different data driver chips in at least one embodiment of the present disclosure;
fig. 7 is a diagram illustrating an example of charging of a display unit of the display device shown in fig. 5;
fig. 8 is a flowchart illustrating a driving method of a display device according to at least one embodiment of the present disclosure.
Detailed Description
The present disclosure describes embodiments, but the description is illustrative rather than limiting and it will be apparent to those of ordinary skill in the art that many more embodiments and implementations are possible within the scope of the embodiments described in the present disclosure. Although many possible combinations of features are shown in the drawings and discussed in the embodiments, many other combinations of the disclosed features are possible. Any feature or element of any embodiment may be used in combination with or instead of any other feature or element in any other embodiment, unless expressly limited otherwise.
The present disclosure includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The embodiments, features and elements of the present disclosure that have been disclosed may also be combined with any conventional features or elements to form unique inventive aspects as defined by the claims. Any feature or element of any embodiment may also be combined with features or elements from other inventive aspects to form yet another unique inventive aspect, as defined by the claims. Thus, it should be understood that any features shown or discussed in this disclosure may be implemented separately or in any suitable combination. Accordingly, the embodiments are not limited except as by the appended claims and their equivalents. Furthermore, various modifications and changes may be made within the scope of the appended claims.
Further, in describing representative embodiments, the specification may have presented a method or process as a particular sequence of steps. However, to the extent that the method or process does not rely on the particular order of steps set forth herein, the method or process should not be limited to the particular sequence of steps described. Other orders of steps are possible as will be understood by those of ordinary skill in the art. Therefore, the particular order of the steps set forth in the specification should not be construed as limitations on the claims. Further, the claims directed to the method or process should not be limited to the performance of their steps in the order written, and one skilled in the art can readily appreciate that the sequences may be varied and still remain within the spirit and scope of the embodiments of the present disclosure.
In the drawings, the size of the constituent elements, the thickness of layers, or regions may be exaggerated for clarity. Therefore, one mode of the present disclosure is not necessarily limited to the dimensions, and the shape and size of each component in the drawings do not reflect a true scale. Further, the drawings schematically show ideal examples, and one embodiment of the present disclosure is not limited to the shapes, numerical values, and the like shown in the drawings.
Unless defined otherwise, technical or scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. In the present disclosure, "a plurality" may mean two or more numbers. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "coupled," "connected," or "connected," and the like, are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "electrically connected" includes the case where constituent elements are connected together by an element having some sort of electrical action. The "element having a certain electric function" is not particularly limited as long as it can transmit and receive an electric signal between connected components. Examples of the "element having some kind of electric function" include not only an electrode and a wiring but also a switching element such as a transistor, a resistor, an inductor, a capacitor, another element having one or more functions, and the like.
To maintain the following description of the embodiments of the present disclosure clear and concise, a detailed description of some known functions and components have been omitted from the present disclosure. The drawings of the embodiments of the disclosure only relate to the structures related to the embodiments of the disclosure, and other structures can refer to the common design.
Fig. 1 is a schematic diagram of a large-sized display device with irregular shape cutting. As shown in fig. 1, the display device may include a display area 10 and a peripheral area located at the periphery of the display area 10. A plurality of regularly arranged display units are disposed in the display region 10, and a driving circuit is disposed in the peripheral region. The driving circuit may include a gate driving circuit 11 located at the right side of the display region 10 and a source driving circuit 12 located at the lower side of the display region 10. In other words, the gate driving circuit 11 and the source driving circuit 12 are respectively located at adjacent two sides of the display region 10. A plurality of scan lines and a plurality of data lines are further disposed in the display region 10, the scan lines and the data lines intersect to form a plurality of sub-pixel regions, and each display unit (i.e., sub-pixel) is located in one sub-pixel region. For example, the display cells P1 and P2 are located in different columns of the same row, the display cell P1 is located in the left half of the display area 10 away from the gate driving circuit 11, and the display cell P2 is located in the right half of the display area 10 close to the gate driving circuit 11.
The gate driving circuit 11 may provide gate driving signals to the plurality of display units through a plurality of scan lines, and the source driving circuit 12 may provide data signals to the plurality of display units through a plurality of data lines. Each display cell may include a Thin Film Transistor (TFT), a gate electrode of which may be coupled to a scan line, a source electrode of which is connected to a data line, and a drain electrode of which is coupled to a pixel electrode. The on-off of the thin film transistor can be controlled by a gate driving signal provided by the scanning line, so that whether a data signal provided by the data line is written into the pixel electrode or not is controlled. The brightness of each display cell of the display device is determined by the voltage difference applied between the pixel electrode and the common electrode.
In some examples, the display device may be a liquid crystal display device. In order to prevent polarization of liquid crystal, the liquid crystal display device often adopts a driving method of polarity inversion, that is, it is necessary to switch the positive and negative polarities of the voltage of the data signal input to the subpixel. The driving method of polarity inversion includes frame inversion, row inversion, column inversion and dot inversion. For example, for two adjacent frames, the voltage polarity of the data signal input to the pixel electrode in one frame is positive (i.e., positive frame driving is performed), and the voltage polarity of the data signal input to the pixel electrode in the other frame is negative (i.e., negative frame driving is performed); alternatively, for two adjacent rows of sub-pixels, the voltage polarity of the data signal input to the pixel electrode of one row of sub-pixels is positive, and the voltage polarity of the data signal input to the pixel electrode of the other row of sub-pixels is negative.
Fig. 2 is a diagram illustrating an example of charging of a display unit of the display device shown in fig. 1. Fig. 2 illustrates a charging process of the display cell P1 (far from the gate driving circuit 11) and the display cell P2 (near to the gate driving circuit 12) of the display device shown in fig. 1. In this example, the display device is a liquid crystal display device, and the data voltage of the data signal supplied to the display cell P1 and the display cell P2 by the source driving circuit 12 is positive in polarity. As shown in fig. 2, the Data voltages of the Data signals (Data (P1) and Data (P2)) output by the source driving circuit 12 to the display cells P1 and P2 in the same row and different columns through the Data lines are the same at the same gray scale. Since the Gate driving circuit 11 is provided only at the right side of the display region 10, the Gate driving circuit 11 provides a Gate driving capability to the right half of the display region 10 that is stronger than the Gate driving capability to the left half of the display region 10, and the Delay (Gate Delay) of the Gate driving signal (Gate (P1)) of the display cell P1 located at the left half is greater than the Delay of the Gate driving signal (Gate (P2)) of the display cell P2 located at the right half. As shown in fig. 2, the charging rate of the display unit P1 is significantly lower than that of the display unit P2 during the charging period. The insufficient charging rate of the display unit located in the left half portion causes an image quality unevenness problem such as a light color on the left half portion of the display area.
The embodiment of the disclosure provides a circuit board for signal transmission, a display device and a driving method thereof, which can support and improve the condition of uneven display caused by different gate driving capacities at different positions of a display area.
The disclosed embodiment provides a circuit board (may be referred to as XPCB) for signal transmission, including a plurality of connection units, each connection unit for connecting a control circuit and a plurality of data driving units; for any one connection unit, the impedances of the connection units between different data driving units and the control circuit are different, so that the gamma reference voltages of the same gray scale received by different data driving units from the control circuit are different.
In this embodiment, the gamma reference voltages of the same gray scale received by the different data driving units through the XPCB are different, so that the data voltages of the same gray scale generated by the different data driving units according to the received gamma reference voltages can be different, thereby improving the problem of uneven display of the display device caused by single-side driving.
In this embodiment, the number of the connection units may be the same as the number of the gamma reference voltages provided by the control circuit. For example, if the control circuit provides four gamma reference voltages, the number of the connection units may be four, and the control circuit may provide one gamma reference voltage to the plurality of data driving units through one connection unit. In some examples, the control circuit may provide two sets of gamma reference voltages to the plurality of data driving units, respectively, wherein the two sets of gamma reference voltages include a positive polarity gamma reference voltage and a negative polarity gamma reference voltage corresponding to a highest gray scale (255 gray scales), and a positive polarity gamma reference voltage and a negative polarity gamma reference voltage corresponding to a lowest gray scale (0 gray scale). However, the present embodiment does not limit the number of gamma reference voltages provided by the control circuit.
In some exemplary embodiments, each data driving unit may include at least one data driving chip. The data driving Chip can be arranged On the XPCB in a COF (Chip On Film) packaging mode. The data driving chip may convert the received image data into analog voltages (i.e., data signals) according to the received gamma reference voltages and output the analog voltages to the data lines, so as to drive the display device to operate.
In some examples, the number of data driving chips included in each data driving unit may be the same. For example, each data driving unit may include one data driving chip, or each data driving unit may include three data driving chips. In some examples, a number of data driving chips included in a part of the plurality of data driving units may be the same. For example, a part of the plurality of data driving units may include only one data driving chip, respectively, and another part of the plurality of data driving units may include three data driving chips, respectively. However, this embodiment is not limited to this.
In some exemplary embodiments, any one of the connection units may include a trace for transmitting a gamma reference voltage, and the trace impedance may be different between different data driving units and the control circuit.
In some exemplary embodiments, any one of the connection units may include a plurality of resistors and a trace for transmitting a gamma reference voltage; the resistance impedances between different data driving units and the control circuit may be different. In some examples, the resistance impedances between different data driving units and the control circuit may be different, and the trace impedances may be the same. In some examples, the resistance and the total impedance of the traces may be different between different data drive units and the control circuitry.
In some exemplary embodiments, one resistor may be connected between each data driving unit and the control circuit, or one resistor may be connected between each data driving chip and the control circuit, for any one of the connection units. In some examples, the resistance impedances between different data driving units and the control circuit may be different, and the resistance impedances between different data driving chips and the control circuit within the same data driving unit may be the same.
Fig. 3 is an exemplary diagram of a circuit board for signal transmission according to at least one embodiment of the present disclosure. In this example, the number of the data driving units may be twelve, and each data driving unit includes one data driving chip; for example, the first data driving unit includes the data driving chip S _ IC1, the second data driving unit includes the data driving chip S _ IC2, and so on up to the twelfth data driving unit includes the data driving chip S _ IC 12. The number of XPCBs 31 is four, i.e., each XPCB can be used to connect three data driving units to the control circuit. However, this embodiment is not limited to this. The control circuit may include a programmable Gamma correction buffer circuit (P-Gamma)301, the P-Gamma 301 being disposed on a Timing Control (TCON) circuit board 30. The adjacent XPCBs 31 can be connected through the trace 320, and the XPCB31 and the TCON circuit board 30 can be connected through a Flexible Flat Cable (FFC) 321.
In this example, as shown in fig. 3, taking one connection unit of the XPCB31 as an example for explanation, the P-Gamma 301 may supply one Gamma reference voltage to twelve data driving chips S _ IC1 to S _ IC12 through the connection unit. As shown in fig. 3, one connection unit of each XPCB31 may include a trace 310 for transmitting a Gamma reference voltage and three resistors, and two ends of each resistor are respectively connected to one data driving chip and the P-Gamma 301. Taking the first XPCB31 on the right side of fig. 3 as an example, one connection unit of the XPCB31 includes a trace 310 for transmitting gamma reference voltages and three resistors R1 to R3; one end of the resistor R1 is connected to the data driving chip S _ IC1 through a trace, and the other end is connected to the P-Gamma 301 through a trace 310, a trace 320 and an FFC 321; one end of the resistor R2 is connected with the data driving chip S _ IC2 through a wire, and the other end is connected with the P-Gamma 301 through a wire 310, a wire 320 and an FFC 321; one end of the resistor R3 is connected to the data driving chip S _ IC3 through a trace, and the other end is connected to the P-Gamma 301 through the trace 310, the trace 320 and the FFC 321. Similarly, the connection manner of the resistor R4 to the resistor R12 is similar to the connection manner of the resistors R1 to R3, and is not described herein again.
In some examples, when each data driving unit includes a plurality of data driving chips, the plurality of data driving chips within the same data driving unit may be connected to the same resistor; or, each data driving chip in the same data driving unit may be connected to a resistor, and the impedance of the resistor connected to each data driving chip may be the same. However, this embodiment is not limited to this. In some examples, taking the example that four data driving units include twelve data driving chips shown in fig. 3, each data driving unit may include three data driving chips, e.g., a first data driving unit may include data driving chips S _ IC1 to S _ IC3, a second data driving unit may include data driving chips S _ IC4 to S _ IC6, a third data driving unit may include data driving chips S _ IC7 to S _ IC9, and a fourth data driving unit may include data driving chips S _ IC10 to S _ IC 12. In this example, four data driving units may be connected to the TCON circuit board through one XPCB. The resistors R1 to R12 may be divided into four groups: the resistors R1 to R3, the resistors R4 to R6, the resistors R7 to R9 and the resistors R10 to R12 are different in resistance of different groups of resistors, and the same group of resistors is the same in resistance.
In some examples, for the same connection unit, the impedance of the trace connecting each resistor and the data driving chip may be the same, the impedance of the trace 310 connecting each resistor and the FFC 321 may be the same, and the impedance of each resistor may be different, so that the impedances of the connection units between different data driving chips and the P-Gamma 301 are different. However, this embodiment is not limited to this. In some examples, for the same connection unit, the impedance of the trace connecting each resistor and the data driving chip may be the same, the impedance of the trace connecting each resistor and the FFC 321 may be different, and the impedance of each resistor may also be different, so that the impedances of the connection units between different data driving chips and the P-Gamma 301 may be different.
As shown in fig. 3, in the present example, the resistances of the resistors between different data driving chips and P-Gamma are different, that is, the resistances of the resistors R1 to R12 are different, for example, increasing from left to right or decreasing from left to right, so that the Gamma reference voltages of the same gray scale loaded by different data driving chips can be different, and different data driving chips can generate different data voltages at the same gray scale.
Fig. 4 is another example diagram of a circuit board for signal transmission according to at least one embodiment of the present disclosure. In the present exemplary embodiment, one connection unit of each XPCB41 may include traces 410 for transmitting Gamma reference voltages, the traces 410 respectively connecting twelve data driving chips S _ IC1 to S _ IC12 and being connected to P-Gamma 301 on the TCON circuit board 30 via FFC 321. Compared to the example of fig. 3, the connection unit in this example does not include an external resistor. The rest of the structure of the XPCB of this embodiment can refer to the description of the example shown in fig. 3, and therefore, the description thereof is omitted.
In this example, the impedances of the traces 410 between different data driving chips and the FFC 321 are different, so that the gamma reference voltages loaded by different data driving chips with the same gray scale may be different, and thus different data driving chips may generate different data voltages with the same gray scale.
An embodiment of the present disclosure further provides a display device, including: the display device comprises a plurality of regularly arranged display units, a plurality of scanning lines, a plurality of data lines, a gate drive circuit, a control circuit, a plurality of data drive units and at least one circuit board (XPCB) for signal transmission, wherein the circuit board is as described in the embodiment. The display unit is located in a sub-pixel area formed by intersecting a scanning line and a data line. The gate driving circuit provides gate driving signals to the display units through the scanning lines, and the data driving units provide data signals to the display units through the data lines. The gate driving circuit is positioned at one side of the display units along the direction parallel to the scanning lines, and the data driving units are positioned at one side of the display units along the direction parallel to the data lines; the circuit board is used for connecting the control circuit with the plurality of data driving units.
In some examples, the gate driving circuit may be positioned at a left side of the plurality of display units, and the plurality of data driving units may be positioned at a lower side of the plurality of display units; alternatively, the gate driving circuit may be positioned at the right side of the plurality of display units, and the plurality of data driving units may be positioned at the lower side of the plurality of display units. However, this embodiment is not limited to this.
In some exemplary embodiments, the display device may be: the display device comprises any product or component with a display function, such as a liquid crystal display device, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.
In some exemplary embodiments, for one connection unit on the XPCB, an impedance of the connection unit between the control circuit and the data driving unit to which the data line close to the gate driving circuit is connected may be greater than an impedance of the connection unit between the control circuit and the data driving unit to which the data line far from the gate driving circuit is connected. Under the same gray scale, the positive gamma reference voltage received by the data driving unit connected to the data line close to the gate driving circuit through the connection unit may be less than the positive gamma reference voltage received by the data driving unit connected to the data line far from the gate driving circuit through the connection unit. In this example, the positive gamma reference voltage received by the data driving unit providing the data signal to the display unit in the display region with stronger gate driving capability is less than the positive gamma reference voltage received by the data driving unit providing the data signal to the display unit in the display region with weaker gate driving capability under the same gray scale.
In some exemplary embodiments, for one connection unit on the XPCB, an impedance of the connection unit between the control circuit and the data driving unit to which the data line close to the gate driving circuit is connected may be smaller than an impedance of the connection unit between the control circuit and the data driving unit to which the data line far from the gate driving circuit is connected. Under the same gray scale, the gamma reference voltage with negative polarity received by the data driving unit connected to the data line close to the gate driving circuit through the connection unit may be greater than the gamma reference voltage with negative polarity received by the data driving unit connected to the data line far from the gate driving circuit through the connection unit. In this example, the gamma reference voltage with negative polarity received by the data driving unit providing the data signal to the display unit in the display region with stronger gate driving capability is greater than the gamma reference voltage with negative polarity received by the data driving unit providing the data signal to the display unit in the display region with weaker gate driving capability under the same gray scale.
In some exemplary embodiments, a data voltage of a positive polarity generated from the gamma reference voltage by the data driving unit to which the data line close to the gate driving circuit is connected may be less than a data voltage of a positive polarity generated from the gamma reference voltage by the data driving unit to which the data line far from the gate driving circuit is connected, at the same gray scale.
In some exemplary embodiments, the data voltage of the negative polarity generated from the gamma reference voltage by the data driving unit to which the data line close to the gate driving circuit is connected may be greater than the data voltage of the negative polarity generated from the gamma reference voltage by the data driving unit to which the data line far from the gate driving circuit is connected, at the same gray scale.
Fig. 5 is an exemplary diagram of a display device according to at least one embodiment of the present disclosure. The present exemplary embodiment provides a display device including: a plurality of regularly arranged display units, a plurality of scanning lines, a plurality of data lines, a gate driving circuit 51, a control circuit, a plurality of data driving units 33, and a plurality of XPCBs 31. The control circuit includes a P-Gamma disposed on the TCON circuit board 30. As shown in fig. 5, a plurality of regularly arranged display units, a plurality of data lines, and a plurality of scan lines are located in the display region 50, the gate driving circuit 51, a plurality of data driving units 33, and a plurality of circuit boards 31 for signal transmission are located in the peripheral region around the display region 50, the gate driving circuit 51 is located at the right side of the display region 50, and the TCON circuit board 30, a plurality of data driving units 33, and the XPCB31 are located at the lower side of the display region 51. However, this embodiment is not limited to this. In some examples, the gate driving circuit 51 may be located at the left side of the display region 50.
In the present exemplary embodiment, the gate driving circuit 51 supplies the gate driving signals to the plurality of display cells of the display region 50 through the plurality of scan lines, and the plurality of data driving units 33 supplies the data signals to the plurality of display cells of the display region 50 through the plurality of data lines. The display device provided by the present exemplary embodiment may be a liquid crystal display device, the gate driving circuit 51 transmits a gate driving signal to the display units connected to the scan lines through the scan lines to turn on the corresponding display units, the data driving unit 33 transmits a data voltage to the display units connected to the data lines through the data lines to drive the display units to control the liquid crystal to deflect, and the brightness of the liquid crystal display device is controlled by controlling the deflection angle of the liquid crystal. The P-Gamma in the control circuit may generate a plurality of Gamma reference voltages (e.g., including positive and negative Gamma reference voltages of the same gray scale) and output the plurality of Gamma reference voltages to the data driving unit 33 through the XPCB31, and the data driving unit 33 may convert the received image data according to the Gamma reference voltages to generate analog data voltages (e.g., including positive and negative data voltages) and output the data voltages to the data lines to be supplied to the display unit, controlling the brightness of the display unit.
The structures of the data driving unit 33 and the XPCB31 in the display apparatus shown in fig. 5 can refer to the structure illustrated in fig. 3. However, this embodiment is not limited to this. For example, the structures of the data driving unit 33 and the XPCB31 in the display apparatus shown in fig. 5 may refer to the schematic structure of fig. 4. In this example, each data driving unit 33 may include one data driving chip, i.e., twelve data driving chips in total. The data driving chips S _ IC1 to S _ IC12 are sequentially arranged from the right side to the left side of the display region 50, i.e., the data driving chips S _ IC1 to S _ IC12 are sequentially distant from the gate driving circuit 51. The number of the XPCB31 can be four, adjacent XPCBs can be connected through the trace 320, and the XPCB31 and the TCON circuit board 30 can be connected through the FFC 321.
In some examples, in the display device shown in connection with fig. 3 and 5, the impedance of one connection unit on the XPCB31 between the data driving chip and the control circuit to which the data line close to the gate driving circuit 51 is connected may be smaller than the impedance of the connection unit on the XPCB31 between the data driving chip and the control circuit to which the data line far from the gate driving circuit 51 is connected. In this example, the positive polarity gamma reference voltages of the same gray scale supplied from the control circuit to the plurality of data driving chips through the connection unit may be different. The positive gamma reference voltage received by the data driving chip connected to the data line close to the gate driving circuit 51 may be less than the positive gamma reference voltage received by the data driving chip connected to the data line far from the gate driving circuit 51 at the same gray level. In some examples, the impedance relationship of the twelve resistors respectively connected to the twelve data driving chips S _ IC1 to S _ IC12 may be: the resistances of the resistors R1 to R12 decrease in sequence; the positive polarity gamma reference voltages of the same gray levels received by the twelve data driving chips S _ IC1 to S _ IC12 are sequentially increased.
In some examples, in the display device shown in connection with fig. 3 and 5, the impedance of one connection unit on the XPCB31 between the data driving chip and the control circuit to which the data line close to the gate driving circuit 51 is connected may be greater than the impedance of the connection unit on the XPCB31 between the data driving chip and the control circuit to which the data line far from the gate driving circuit 51 is connected. In this example, the negative polarity gamma reference voltages of the same gray scale supplied from the control circuit to the plurality of data driving chips through the connection unit may be different. The gamma reference voltage with negative polarity received by the data driving chip connected to the data line close to the gate driving circuit 51 may be greater than the gamma reference voltage with negative polarity received by the data driving chip connected to the data line far from the gate driving circuit 51 at the same gray level. In some examples, the impedance relationship of the twelve resistors respectively connected to the twelve data driving chips S _ IC1 to S _ IC12 may be: the resistances of the resistors R1 to R12 increase in sequence; the negative gamma reference voltages of the same gray level received by the twelve data driving chips S _ IC1 to S _ IC12 are sequentially decreased.
In this example, the gamma reference voltages of the same gray scale input to the data driving chips corresponding to the display regions having different gate driving capabilities may be different. FIG. 6 is a diagram illustrating gamma reference voltages of different data driver chips according to at least one embodiment of the present disclosure. In this example, the positive polarity gamma reference voltage γ 1 and the negative polarity gamma reference voltage γ 18 corresponding to a group 255 of gray scales received by the twelve data driving chips S _ IC1 to S _ IC12 shown in fig. 3 and 5 are taken as an example for explanation. Vcom represents a common voltage. In this example, since the gate driving circuit is located at the right side of the display region, the gate driving circuit provides a gate driving capability to the right half of the display region that is stronger than the gate driving capability to the left half. As shown in fig. 6, along a direction away from the gate driving circuit (i.e., in a direction from the data driving chip S _ IC1 to the S _ IC 12), the positive polarity gamma reference voltage γ 1 of the 255 gray scale received by the data driving chip S _ IC1 to the S _ IC12 gradually increases, and the negative polarity gamma reference voltage γ 18 of the 255 gray scale received by the data driving chip S _ IC1 to the S _ IC12 gradually decreases.
Fig. 7 is a diagram illustrating an example of charging of a display unit of the display device shown in fig. 5. In this example, a charging process of the display cell P1 '(far from the gate driver circuit 51) and the display cell P2' (near to the gate driver circuit 51) of the display device shown in fig. 5 is taken as an example for explanation. In this example, the display device may be a liquid crystal display device, and the data voltage of the data signal supplied to the display cell P1 'and the display cell P2' by the data driving unit 33 is positive polarity.
In this example, since the positive and negative gamma reference voltages received by different data driving chips are different at the same gray scale, different data driving chips can output different data voltages at the same gray scale. Taking the display device displaying the positive frame of the gray scale 255 as an example, as shown in fig. 7, the Data voltages of the Data signals (Data (P1 ') and Data (P2')) output by the Data driving chip to the display cells P1 'and P2' in the same row and different columns through the Data lines may be different, and the Data voltage of the Data signal of the display cell P1 'may be greater than the Data voltage of the Data signal of the display cell P2'. The Delay (Gate Delay) of the Gate driving signal (Gate (P1 ')) of the display cell P1' in the left half is greater than the Delay of the Gate driving signal (Gate (P2 ')) of the display cell P2' in the right half. As shown in fig. 7, by increasing the magnitude of the data voltage of the display cell P1 'during the charging period, the charging rate of the display cell P1' may be increased to ensure that the pixel voltages on the pixel electrodes of the display cells P1 'and P2' remain the same. The exemplary embodiment can offset a part of pixel voltage difference caused by gate drive delay by using the increase of the data voltage, thereby improving or even eliminating the image quality unevenness problem of light color at the left half of the display area caused by single-side driving.
In the display device provided by the exemplary embodiment, the gamma reference voltages of the same gray scale input by the different data driving chips are different, and therefore, the data driving chips can provide different data voltages to the display units in the same row and different columns under the same gray scale, so that the problem of display unevenness such as light color on the left half of the display area can be solved by changing the charging states of the display units in the left half and the right half.
Fig. 8 is a flowchart illustrating a driving method of a display device according to at least one embodiment of the disclosure. The driving method provided by the present embodiment can be applied to the display device provided by the above embodiments. As shown in fig. 8, the driving method of the present embodiment may include:
in step 802, each data driving unit provides data signals to the data lines according to the received gamma reference voltage, so that the data voltages of the data signals of the same gray scale received by the display units in the same row and different columns are different.
For the related description of the driving method of the present embodiment, reference may be made to the description of the above embodiments, and therefore, the description thereof is omitted here.
Although the embodiments disclosed in the present disclosure are described above, the descriptions are only for the convenience of understanding the present disclosure, and are not intended to limit the present disclosure. It will be understood by those skilled in the art of the present disclosure that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure, and that the scope of the disclosure is to be limited only by the terms of the appended claims.
Claims (10)
1. A circuit board for signal transmission is characterized by comprising a plurality of connecting units, wherein each connecting unit is used for connecting a control circuit with a plurality of data driving units; for any one connection unit, the impedances of the connection units between different data driving units and the control circuit are different, so that the gamma reference voltages of the same gray scale received by different data driving units from the control circuit are different.
2. The circuit board of claim 1, wherein each data driving unit comprises at least one data driving chip.
3. The circuit board of claim 1, wherein the connection unit comprises traces for transmitting gamma reference voltages, and the trace impedances between different data driving units and the control circuit are different.
4. The circuit board of claim 1, wherein the connection unit comprises a plurality of resistors and traces for transmitting gamma reference voltages; the resistance impedances between different data driving units and the control circuit are different.
5. A display device, comprising: a plurality of regularly arranged display units, a plurality of scanning lines, a plurality of data lines, a gate driving circuit, a control circuit, a plurality of data driving units, and at least one circuit board for signal transmission according to any one of claims 1 to 4;
the display unit is positioned in a sub-pixel area formed by the intersection of the scanning lines and the data lines; the grid driving circuit provides grid driving signals for the display units through the scanning lines, and the data driving units provide data signals for the display units through the data lines; the gate driving circuit is located at one side of the plurality of display units in a direction parallel to the plurality of scanning lines, and the plurality of data driving units are located at one side of the plurality of display units in a direction parallel to the plurality of data lines; the circuit board is used for connecting the control circuit and the plurality of data driving units.
6. The display device according to claim 5, wherein for one connection unit on the circuit board, an impedance of the connection unit between the control circuit and the data driving unit to which the data line close to the gate driving circuit is connected is larger than an impedance of the connection unit between the control circuit and the data driving unit to which the data line far from the gate driving circuit is connected; under the same gray scale, the positive gamma reference voltage received by the data driving unit connected to the data line close to the gate driving circuit through the connection unit is smaller than the positive gamma reference voltage received by the data driving unit connected to the data line far away from the gate driving circuit through the connection unit.
7. The display device according to claim 5, wherein for one connection unit on the circuit board, an impedance of the connection unit between the control circuit and the data driving unit to which the data line close to the gate driving circuit is connected is smaller than an impedance of the connection unit between the control circuit and the data driving unit to which the data line far from the gate driving circuit is connected; under the same gray scale, the gamma reference voltage with negative polarity received by the data driving unit connected with the data line close to the gate driving circuit through the connecting unit is greater than the gamma reference voltage with negative polarity received by the data driving unit connected with the data line far away from the gate driving circuit through the connecting unit.
8. The display device according to claim 5, wherein the data driving unit to which the data line close to the gate driving circuit is connected generates a data voltage of positive polarity according to the received gamma reference voltage, which is smaller than the data driving unit to which the data line far from the gate driving circuit is connected generates a data voltage of positive polarity according to the gamma reference voltage, at the same gray scale.
9. The display device according to claim 5, wherein the data driving unit to which the data line close to the gate driving circuit is connected generates a data voltage of a negative polarity according to the received gamma reference voltage, which is larger than the data driving unit to which the data line far from the gate driving circuit is connected generates a data voltage of a negative polarity according to the gamma reference voltage, at the same gray scale.
10. A driving method of a display device, applied to the display device according to any one of claims 5 to 9, comprising:
each data driving unit receives a plurality of gamma reference voltages from the control circuit through the circuit board for signal transmission, wherein the gamma reference voltages of the same gray scale received by different data driving units are different;
each data driving unit provides data signals for the data lines according to the gamma reference voltage, so that the data voltages of the data signals with the same gray scale received by the display units in the same row and different columns are different.
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| CN202010313120.2A CN111402830A (en) | 2020-04-20 | 2020-04-20 | Circuit board for signal transmission, display device and driving method thereof |
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| CN202010313120.2A CN111402830A (en) | 2020-04-20 | 2020-04-20 | Circuit board for signal transmission, display device and driving method thereof |
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