Display driving circuit and display device

Abstract

The invention discloses a display driving circuit and a display device. The display driving circuit is used for driving a display panel. The display driving circuit comprises a data driving module and a resistance compensation module, and the data driving module is used for transmitting display data to a display panel through a plurality of data lines so as to drive the display panel to display. The resistance compensation module comprises a plurality of resistance compensation units, and each resistance compensation unit is used for being correspondingly connected with one data line so as to carry out resistance compensation on routing impedance of the data lines. According to the invention, the charging rates of a plurality of pixel columns in the display panel can be consistent, the uniformity of the display brightness of the display panel is improved, and thus the image display effect is improved.

Description

Technical Field

[0001] This application relates to the field of display technologies, and particularly to a display driving circuit and a display device. Background Art

[0002] In a display device, a display panel needs to be fanned out to a source driving chip through data lines to obtain display data from the source driving chip. Generally, the pixel columns corresponding to any two data lines are located at different positions in the display panel, so that any two data lines connected to the same source driving chip originate from different positions of the display panel, resulting in different lengths of multiple data lines. Since the length of the data line affects the routing impedance of the data line, and the routing impedance affects the transmission rate of the display data, the different lengths of multiple data lines will cause different charging rates of the source driving chip for multiple pixel columns, thereby resulting in uneven display brightness of the display panel and affecting the display effect of the picture. Summary of the Invention

[0003] Embodiments of this application provide a display driving circuit and a display device, which can make the charging rates of multiple pixel columns in the display panel consistent, improve the uniformity of the display brightness of the display panel, and thus improve the display effect of the picture.

[0004] In a first aspect, an embodiment of this application provides a display driving circuit for driving a display panel. The display driving circuit includes a data driving module and a resistance compensation module. The data driving module is configured to transmit display data to the display panel through multiple data lines to drive the display panel to display. Among them, the resistance compensation module includes a plurality of resistance compensation units, and each resistance compensation unit is configured to be correspondingly connected to one of the data lines to perform resistance compensation on the routing impedance of the data line.

[0005] Optionally, each resistance compensation unit includes at least one resistance compensation component; each resistance compensation component includes at least one resistor and a switching element connected in parallel with the at least one resistor.

[0006] Optionally, the resistance compensation unit includes a first resistance compensation component and a second resistance compensation component; the first resistance compensation component includes a first resistor and a first switching element; the first switching element includes a first electrode connected to a first end of the first resistor, a second electrode connected to a second end of the first resistor, and a control electrode for receiving a first control signal; the second resistance compensation component includes a second resistor and a second switching element; a first end of the second resistor is connected to the second end of the first resistor; the second switching element includes a first electrode connected to the first end of the second resistor, a second electrode connected to the second end of the second resistor, and a control electrode for receiving a second control signal; a second end of the second resistor is connected to the data line.

[0007] Optionally, the resistance compensation unit includes a first resistance compensation component, a second resistance compensation component, and a third resistance compensation component; the first resistance compensation component includes a first resistor and a first switching element; the first switching element includes a first electrode connected to the first end of the first resistor, a second electrode connected to the second end of the first resistor, and a control electrode for receiving a first control signal; the second resistance compensation component includes a second resistor and a second switching element; the first end of the second resistor is connected to the second end of the first resistor; the second switching element includes a first electrode connected to the first end of the second resistor, a second electrode connected to the second end of the second resistor, and a control electrode for receiving a second control signal; the third resistance compensation component includes a third resistor and a third switching element; the first end of the third resistor is connected to the second end of the second resistor; the third switching element includes a first electrode connected to the first end of the third resistor, a second electrode connected to the second end of the third resistor, and a control electrode for receiving a third control signal; the second end of the third resistor is connected to the data line.

[0008] Optionally, the resistance value in the resistance compensation unit is negatively correlated with the length of the data line connected to the resistance compensation unit.

[0009] Optionally, each resistance compensation unit and the corresponding connected data line form a data driving line, and the resistance values of any two data driving lines are the same.

[0010] Optionally, the data driving module includes: a data input module, a shift register, a data buffer connected to the data input module and the shift register, a data latch connected to the data buffer, a level conversion module connected to the data latch, a gamma voltage module, a digital-to-analog conversion module connected to the level conversion module and the gamma voltage module, and an output buffer module connected to the digital-to-analog conversion module; wherein, the resistance compensation module is connected to the output buffer module.

[0011] In a second aspect, an embodiment of the present application provides a display device, which includes the above display driving circuit and a display panel, and the display driving circuit is used to transmit display data to the display panel.

[0012] Optionally, the display panel includes a plurality of pixel columns, and each resistance compensation unit is connected to a pixel column through a data line; the data driving module transmits the display data to the pixel column through the resistance compensation unit and the data line.

[0013] Optionally, the display device includes a plurality of the display driving circuits, and the display device further includes a plurality of fan-out routing areas respectively corresponding to the plurality of display driving circuits. Each display driving circuit is connected to the display panel through the data lines in the corresponding fan-out routing area. Among them, at least two of the data lines connected to the same display driving circuit have different lengths.

[0014] In summary, in the embodiments of the present application, a data line and a resistor compensation unit can form a data driving line for transmitting display data. The resistor compensation unit compensates the routing impedance of the data line, so that the resistance values of a plurality of data driving lines for transmitting display data can be kept consistent. For example, the resistance values of the plurality of data driving lines are the same or almost the same. Based on this, the transmission rates of the plurality of data driving lines for display data can be kept consistent, so that the charging rates of a plurality of pixel columns in the display panel are consistent, improving the uniformity of the display brightness of the display panel, and thus improving the picture display effect. Description of the Drawings

[0015] Figure 1 is a schematic diagram of a display device;

[0016] Figure 2 is a schematic diagram of another display device;

[0017] Figure 3 is a schematic diagram of the relationship between the position of the data line in the fan-out routing area and the routing impedance;

[0018] Figure 4 is a schematic diagram of the relationship between the charging voltage of the pixel column and time;

[0019] Figure 5 is a schematic diagram of a display device provided by an embodiment of the present application;

[0020] Figure 6 is a schematic diagram of a display driving circuit provided by an embodiment of the present application;

[0021] Figure 7 is a schematic diagram of a resistor compensation unit provided by an embodiment of the present application;

[0022] Figure 8 is a schematic diagram of the relationship between the position of a data line provided by an embodiment of the present application and the resistance value in the resistor compensation unit;

[0023] Figure 9 is a schematic diagram of the relationship between the phase state of a control signal provided by an embodiment of the present application and the resistance value in the resistor compensation unit. Detailed Embodiments

[0024] The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application. The described technical solutions are only used to explain and illustrate the idea of the present application, and should not be regarded as a limitation on the protection scope of the present application.

[0025] In addition, "a plurality of" in the embodiments of the present application means two or more. "First", "second", etc. in the embodiments of the present application are used to distinguish different technical features, and do not represent any order, quantity or importance.

[0026] The various embodiments provided by the present application are similar, and the features in different embodiments can be combined with each other.

[0027] The description order of the following embodiments is not used as a limitation on the preferred order of the embodiments.

[0028] Please refer to Figure 1 , Figure 1 which is a schematic diagram of a display device. As Figure 1 shown, the display device includes a display panel 100 and a plurality of source driver chips 200. Among them, the display panel 100 includes a fan-out routing area 110 corresponding to the plurality of source driver chips 200 respectively, and a plurality of data lines 111 for connecting the source driver chips 200 in the display panel 100 are located in the fan-out routing area 110. Thus, each source driver chip 200 is connected to the display panel 100 through a plurality of data lines 111 in the corresponding fan-out routing area 110. As Figure 1 shown, Figure 1 in

[0029] As Figure 2 shown, in the x direction, that is, in the column direction of the display device, the display panel 100 further includes a plurality of pixel columns 120. A data line 111 is used to transmit display data from the source driver chip 200 to a pixel column 120. As Figure 2 shown, the pixel columns 120 corresponding to any two data lines 111 are not in the same position in the display panel 100. Thus, any two data lines 111 connected to the same source driver chip 200 originate from different positions of the display panel 100, resulting in different lengths of the plurality of data lines 111. As Figure 1 shown, among the plurality of data lines 111 connected to the same source driver chip 200, the data lines 111 located at the edge of the fan-out routing area 110 are longer, while the data lines 111 located in the middle of the fan-out routing area 110 are shorter.

[0030] Generally, the length of the data line 111 will affect the routing impedance of the data line 111. The longer the length of the data line 111, the greater the routing impedance, and the shorter the length of the data line 111, the smaller the routing impedance.Figure 3 The relationship between the position of the data line 111 in the fan-out routing area 110 and the routing impedance is shown. As Figure 3 shown, the lengths of the data lines 111 (such as data lines Y1 and Y960, etc.) located at the edge of the fan-out routing area 110 are longer, so the routing impedance of the data lines 111 located at the edge of the fan-out routing area 110 is larger; the lengths of the data lines 111 (such as data line Y480, etc.) located in the middle of the fan-out routing area 110 are shorter, so the routing impedance of the data lines 111 located in the middle of the fan-out routing area 110 is smaller. In addition, as Figure 1 shown, from the edge to the middle of the fan-out routing area 110, the lengths of the data lines 111 decrease in sequence; as Figure 3 shown, from the edge to the middle of the fan-out routing area 110, the routing impedances of the data lines 111 also decrease in sequence; therefore, the routing impedance of the data line 111 is positively correlated with the length of the data line 111.

[0031] The routing impedance of the data line 111 affects the transmission rate of the display data, thereby affecting the charging rate of the pixel column 120. Figure 4 The relationship between the charging voltage and time when the display data reaches the pixel column 120 after passing through the data line 111 is shown. It can be known from Figure 4 that the charging voltage rising rate of the pixel column 120 connected to the data line 111 with a larger routing impedance is slower, that is, the charging rate is slower; the charging voltage rising rate of the pixel column 120 connected to the data line 111 with a smaller routing impedance is faster, that is, the charging rate is faster.

[0032] Therefore, the different lengths of the multiple data lines 111 will cause the charging rates of the source driver chip 200 for the multiple pixel columns 120 to be different, thereby resulting in uneven display brightness of the display panel 100 and affecting the display effect of the picture. In view of this, the embodiments of the present application provide a display driving circuit and a display device, which can compensate the routing impedance of the data line to improve the display effect of the picture.

[0033] Please refer to Figure 5 , Figure 5 which is a schematic diagram of a display device provided by an embodiment of the present application. As Figure 5 shown, the display device includes a display driving circuit 500 and a display panel 100. Among them, the display driving circuit 500 is used to transmit display data to the display panel 100.

[0034] In the embodiments of the present application, the display driving circuit 500 includes a data driving module 510 and a resistance compensation module 520. Among them, the data driving module 510 is used to transmit display data to the display panel 100 through a plurality of data lines 111 to drive the display panel 100 to display; the resistance compensation module 520 includes a plurality of resistance compensation units 521, and each resistance compensation unit 521 is used to be correspondingly connected to a data line 111 to perform resistance compensation on the trace impedance of the data line 111.

[0035] In some embodiments, the display device includes a plurality of display driving circuits 500, and the display device further includes a plurality of fan-out routing areas corresponding to the plurality of display driving circuits 500 respectively. Each display driving circuit 500 is connected to the display panel 100 through the data lines 111 in the corresponding fan-out routing area. Among them, the lengths of at least two data lines 111 connected to the same display driving circuit 500 are different. Since the lengths of the plurality of data lines 111 are different, the trace impedances of the plurality of data lines 111 are not the same, and thus the transmission rates of the plurality of data lines 111 for the display data are also not the same.

[0036] In the embodiments of the present application, a data line 111 and a resistance compensation unit 521 can form a data driving line for transmitting display data. As Figure 5 shown, each resistance compensation unit 521 and the corresponding data line 111 form a data driving line. By performing resistance compensation on the trace impedance of the data line 111 through the resistance compensation unit 521, the resistance values of the plurality of data driving lines for transmitting display data can be made consistent. For example, the resistance values of any two data driving lines can be the same or almost the same. It should be understood that the "almost the same" described in the embodiments of the present application may mean that the difference between two or more of them is within a preset range. For other introductions and descriptions of the data driving module 510, the resistance compensation module 520, and the resistance compensation method, please refer to the following embodiments and will not be elaborated here.

[0037] In some embodiments, as Figure 5 shown, in the x direction, that is, in the column direction of the display device, the display panel 100 includes a plurality of pixel columns 120. Each resistance compensation unit 521 is connected to a pixel column 120 through a data line 111, and the data driving module 510 transmits display data to the pixel column 120 through the resistance compensation unit 521 and the data line 111. As Figure 5As shown, the resistor compensation unit 521 is connected between the data driving module 510 and the data line 111. The display data output by the data driving module 510 reaches the pixel column 120 after passing through the data driving line formed by the resistor compensation unit 521 and the data line 111. After the resistor compensation unit 521 compensates the trace impedance of the data line 111, the resistance values of multiple data driving lines can be kept consistent. As a result, the transmission rates of the display data in multiple data driving lines are consistent, so that the charging rates of multiple pixel columns 120 are consistent. For example, the charging rates of multiple pixel columns 120 are the same or almost the same.

[0038] In summary, the display device provided by the embodiment of the present application includes a display driving circuit and a display panel. The display driving circuit includes a data driving module and a resistor compensation module. The data driving module is used to transmit display data to the display panel through multiple data lines to drive the display panel to display. Each resistor compensation unit in the resistor compensation module is used to be correspondingly connected to a data line to compensate the trace impedance of the data line. In the embodiment of the present application, a data driving line for transmitting display data can be formed by a data line and a resistor compensation unit. By compensating the trace impedance of the data line through the resistor compensation unit, the resistance values of multiple data driving lines for transmitting display data can be kept consistent. For example, the resistance values of multiple data driving lines are the same or almost the same. Based on this, the transmission rates of multiple data driving lines for display data can be kept consistent, so that the charging rates of multiple pixel columns in the display panel are consistent, improving the uniformity of the display brightness of the display panel, and thus improving the picture display effect.

[0039] It should be noted that the embodiment of the present application can improve the structure of the original source driver chip 200. The original source driver chip 200 can be the data driving module 510. On this basis, a resistor compensation module 520 is added inside the original source driver chip 200 to form the improved source driver chip 200, and the improved source driver chip 200 is the display driving circuit 500. Alternatively, the embodiment of the present application can also keep the structure of the original source driver chip 200 unchanged. The above source driver chip 200 can be the data driving module 510, and the resistor compensation module 520 can be a module independent of the above source driver chip 200. The display driving circuit 500 includes the above source driver chip 200 and the resistor compensation module 520.

[0040] Please refer to Figure 6 , Figure 6 which is a schematic diagram of a display driving circuit provided by the embodiment of the present application. The display driving circuit 500 is used to drive the display panel 100. As Figure 6As shown, the display driving circuit 500 includes a data driving module 510 and a resistance compensation module 520.

[0041] As Figure 5 shown, the data driving module 510 is configured to transmit display data to the display panel 100 through a plurality of data lines 111 to drive the display panel 100 to display; the resistance compensation module 520 includes a plurality of resistance compensation units 521, and each resistance compensation unit 521 is configured to be correspondingly connected to a data line 111 to perform resistance compensation on the trace impedance of the data line 111.

[0042] The embodiment of the present application does not limit the specific structure of the data driving module 510. In some embodiments, as Figure 6 shown, the data driving module 510 includes: a data input module 511, configured to receive an externally input data signal; a shift register 512, configured to convert the input data into serial data to ensure the transmission timing of the data; a data buffer 513 connected to the data input module 511 and the shift register 512, configured to temporarily store the input data; a data latch 514 connected to the data buffer 513, configured to perform data synchronization to ensure the timing accuracy of data transmission and subsequent processing; a level conversion module 515 connected to the data latch 514, configured to perform level conversion to ensure that the signal level is compatible with subsequent modules, etc.; a gamma voltage module 516, configured to provide a reference voltage for digital-to-analog conversion; a digital-to-analog conversion module 517 connected to the level conversion module 515 and the gamma voltage module 516, configured to convert the data signal into an analog signal according to the reference voltage; and an output buffer module 518 connected to the digital-to-analog conversion module 517, configured to amplify and stabilize the output signal to ensure that the output signal has sufficient driving ability. Among them, as Figure 6 shown, the resistance compensation module 520 is connected to the output buffer module 518.

[0043] The embodiment of the present application does not limit the specific structure of the resistance compensation unit 521. To implement the resistance compensation function, the resistance compensation unit 521 may include at least one resistor. In addition, since the structures and sizes of different display panels 100 may be different, the structures and sizes of the fan-out routing areas for placing the data lines 111 may be different, so the length combinations of the data lines 111 in different display panels 100 may also be different. To adapt to different display panels 100, the resistance compensation unit 521 may include a resistor with a variable resistance value, or may include a plurality of resistors with different resistance values.

[0044] In some embodiments, as Figure 7 shown, each resistance compensation unit 521 includes at least one resistance compensation component 700. Each resistance compensation component 700 includes at least one resistor 710 and a switching element 720 connected in parallel with the at least one resistor 710.Figure 7 Taking the example that the resistance compensation unit 521 includes three resistance compensation components 700, and the resistance compensation component 700 includes a resistor 710 and a switching element 720, this does not constitute a limitation to this application. Among them, the switching element 720 can control whether to perform resistance compensation through the corresponding resistor 710. In the resistance compensation component 700, the switching element 720 is connected in parallel with at least one resistor 710. When the switching element 720 is turned off, the display data can flow through at least one resistor 710 connected in parallel with the switching element 720, so that resistance compensation can be performed through at least one resistor 710; when the switching element 720 is turned on, the display data does not flow through at least one resistor 710 connected in parallel with the switching element 720, but flows through the switching element 720. Therefore, resistance compensation is not performed through at least one resistor 710 connected in parallel with the switching element 720.

[0045] In some embodiments, the resistance compensation unit 521 includes a first resistance compensation component and a second resistance compensation component. The first resistance compensation component includes a first resistor and a first switching element. The first switching element includes a first electrode connected to the first end of the first resistor, a second electrode connected to the second end of the first resistor, and a control electrode for accessing the first control signal S1. The second resistance compensation component includes a second resistor and a second switching element. The first end of the second resistor is connected to the second end of the first resistor. The second switching element includes a first electrode connected to the first end of the second resistor, a second electrode connected to the second end of the second resistor, and a control electrode for accessing the second control signal S2. The second end of the second resistor is connected to the data line.

[0046] In some embodiments, the resistance compensation unit 521 includes a first resistance compensation component, a second resistance compensation component, and a third resistance compensation component. The first resistance compensation component includes a first resistor and a first switching element. The first switching element includes a first electrode connected to the first end of the first resistor, a second electrode connected to the second end of the first resistor, and a control electrode for accessing the first control signal S1. The second resistance compensation component includes a second resistor and a second switching element. The first end of the second resistor is connected to the second end of the first resistor. The second switching element includes a first electrode connected to the first end of the second resistor, a second electrode connected to the second end of the second resistor, and a control electrode for accessing the second control signal S2. The third resistance compensation component includes a third resistor and a third switching element. The first end of the third resistor is connected to the second end of the second resistor. The third switching element includes a first electrode connected to the first end of the third resistor, a second electrode connected to the second end of the third resistor, and a control electrode for accessing the third control signal S3. The second end of the third resistor is connected to the data line.

[0047] The above-mentioned switching element 720 can be an NMOS (N-Metal-Oxide-Semiconductor) switching transistor or a PMOS (P-Metal-Oxide-Semiconductor) switching transistor. The above-mentioned control signal can include two phase states of low potential and high potential to control the conduction and cut-off of the switching element 720. When the switching element 720 is an NMOS switching transistor, the switching element 720 conducts when a high potential is applied to the control electrode and cuts off when a low potential is applied to the control electrode. When the switching element 720 is a PMOS switching transistor, the switching element 720 conducts when a low potential is applied to the control electrode and cuts off when a high potential is applied to the control electrode. By controlling the conduction and cut-off of the switching element 720 in each resistance compensation component 700, it is possible to control whether resistance compensation is performed through the resistance compensation component 700.

[0048] The structures of the multiple resistance compensation units 521 in the resistance compensation module 520 may be the same or different, and the embodiments of the present application do not limit this. For example, each resistance compensation unit 521 includes three resistance compensation components 700, and each resistance compensation component 700 includes a resistor 710 and a switching element 720 connected in parallel. Another example is that some resistance compensation units 521 include two resistance compensation components 700, some resistance compensation units 521 include three resistance compensation components 700, and some resistance compensation units 521 include four resistance compensation components 700, etc. The structures of the multiple resistance compensation components 700 in the resistance compensation unit 521 may be the same or different, and the embodiments of the present application do not limit this either. For example, the resistance compensation unit 521 includes three resistance compensation components 700, and each resistance compensation component 700 includes a resistor 710 and a switching element 720 connected in parallel. Another example is that the resistance compensation unit 521 includes two resistance compensation components 700, one resistance compensation component 700 includes a resistor 710 and a switching element 720 connected in parallel, and the other resistance compensation component 700 includes two resistors 710 and a switching element 720 connected in parallel with these two resistors 710.

[0049] To make the overall line impedance of the data driving lines for transmitting display data consistent, for data lines 111 with different lengths, the resistance values compensated by the resistance compensation unit 521 for the data lines 111 are different. In some embodiments, the resistance value in the resistance compensation unit 521 and the length of the data line 111 connected to the resistance compensation unit 521 are negatively correlated. The longer the length of the data line 111, the greater the routing impedance of the data line 111. To make the overall line impedance consistent, the resistance value in the resistance compensation unit 521 can be set smaller; the shorter the length of the data line 111, the smaller the routing impedance of the data line 111. To make the overall line impedance consistent, the resistance value in the resistance compensation unit 521 can be set larger.

[0050] Figure 8 The relationship between the position of the data line 111 in the fan-out routing area and the resistance value in the resistance compensation unit 521 is shown. As Figure 8 shown, the data lines 111 (such as data lines Y1 and Y960, etc.) located at the edge of the fan-out routing area have longer lengths, so the routing impedance of the data lines 111 located at the edge of the fan-out routing area is greater, and the resistance value in the resistance compensation unit 521 connected to the data line 111 is smaller; the data lines 111 (such as data line Y480, etc.) located in the middle of the fan-out routing area have shorter lengths, so the routing impedance of the data lines 111 located in the middle of the fan-out routing area is smaller, and the resistance value in the resistance compensation unit 521 connected to the data line 111 is larger. In addition, as Figure 8 shown, from the edge to the middle of the fan-out routing area, the routing impedance of the data line 111 decreases in sequence, and the resistance value in the resistance compensation unit 521 increases in sequence. The impedance of the data channel for transmitting display data is the sum of the routing impedance of the data line 111 and the resistance value in the resistance compensation unit 521, so that the overall line impedance can be kept consistent. Since the routing impedance of the outermost data line 111 in the fan-out routing area is the largest, the resistance value in the resistance compensation unit 521 connected to the outermost data line 111 can be determined according to the routing impedance of the outermost data line 111, and then the resistance values in the resistance compensation units 521 connected to other data lines 111 can be determined to ensure the overall line impedance is consistent. In addition, the resistance values of the resistors in the multiple resistance compensation components 700 can be the same or different, and the embodiments of the present application do not limit this either.

[0051] Take the example that each resistance compensation unit 521 includes three resistance compensation components 700, each resistance compensation component 700 includes a resistor 710 and a switching element 720 connected in parallel, and the resistance value of each resistance compensation component 700 is R i as an example. In this example, each switching element 720 is an NMOS switching tube. The switching element 720 is turned on when a high potential is applied to the control electrode and turned off when a low potential is applied to the control electrode. As Figure 9As shown, according to the phase state of the control signals connected to the switching element 720, the resistance values in the resistance compensation unit 521 are as follows.

[0052] (1) All three control signals are at low potential, and the resistance value in the resistance compensation unit 521 is 3R i : If all three control signals (the first control signal S1, the second control signal S2, and the third control signal S3) are at low potential, then the switching elements in all three resistance compensation components 700 are turned off, and the resistance value in each resistance compensation component 700 is R i , and the resistance value in each resistance compensation unit 521 is 3R i .

[0053] (2) Two control signals are at low potential and one control signal is at high potential, and the resistance value in the resistance compensation unit 521 is 2R i : If two control signals are at low potential and one control signal is at high potential, then the switching elements in two resistance compensation components 700 are turned off and the switching element in one resistance compensation component 700 is turned on. The resistance values in the two resistance compensation components 700 are both R i and the resistance value in one resistance compensation component 700 is 0, so that the resistance value in the resistance compensation unit 521 is 2R i . For example, the first control signal S1 and the second control signal S2 are both at low potential and the third control signal S3 is at high potential, or the first control signal S1 and the third control signal S3 are both at low potential and the second control signal S2 is at high potential, or the second control signal S2 and the third control signal S3 are both at low potential and the first control signal S1 is at high potential.

[0054] (3) One control signal is at low potential and two control signals are at high potential, and the resistance value in the resistance compensation unit 521 is R i : If one control signal is at low potential and two control signals are at high potential, then the switching element in one resistance compensation component 700 is turned off and the switching elements in two resistance compensation components 700 are turned on. The resistance value in one resistance compensation component 700 is R i and the resistance values in the two resistance compensation components 700 are 0, so that the resistance value in the resistance compensation unit 521 is R i . For example, the first control signal S1 and the second control signal S2 are both at high potential and the third control signal S3 is at low potential, or the first control signal S1 and the third control signal S3 are both at high potential and the second control signal S2 is at low potential, or the second control signal S2 and the third control signal S3 are both at high potential and the first control signal S1 is at low potential.

[0055] (4) All three control signals are at high potential and the resistance value in the resistance compensation unit 521 is 0: When all three control signals (the first control signal S1, the second control signal S2, and the third control signal S3) are at high potential, the switching elements in the three resistance compensation components 700 are all turned on, the resistance value in each resistance compensation component 700 is 0, and the resistance value in each resistance compensation unit 521 is 0. At this time, no resistance compensation is performed through the resistance compensation unit 521.

[0056] In summary, the display driving circuit provided by the embodiment of the present application includes a data driving module and a resistance compensation module. The data driving module is used to transmit display data to the display panel through multiple data lines to drive the display panel to display. Each resistance compensation unit in the resistance compensation module is used to be correspondingly connected to a data line to perform resistance compensation on the trace impedance of the data line. In the embodiment of the present application, a data line and a resistance compensation unit can form a data driving line for transmitting display data. By performing resistance compensation on the trace impedance of the data line through the resistance compensation unit, the resistance values of multiple data driving lines for transmitting display data can be made to be the same, for example, the resistance values of multiple data driving lines are the same or almost the same. Based on this, the transmission rates of multiple data driving lines for display data can be kept consistent, so that the charging rates of multiple pixel columns in the display panel are consistent, improving the uniformity of the display brightness of the display panel, and thus improving the picture display effect.

[0057] In addition, the resistance compensation unit in the embodiment of the present application includes at least one resistance compensation component, and each resistance compensation component includes at least one resistance and a switching element connected in parallel with the at least one resistance. Since the structures and sizes of different display panels may be different, the structures and sizes of the fan-out trace areas for placing data lines may be different, and thus the length combinations of data lines in different display panels may also be different. In the embodiment of the present application, by turning on or off the switching element, it can be controlled whether the display data flows through the resistance connected in parallel with the switching element, so as to adjust the resistance values in the resistance compensation component and the resistance compensation unit to adapt to different display panels. For example, in the example Figure 9 shown above, there are three different cases for the resistance value in the resistance compensation unit, which can be adapted to three different display panels.

[0058] The above has introduced in detail a display driving circuit and a display device provided by the embodiment of the present application. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A display driving circuit for driving a display panel, characterized in that, The display driving circuit includes a data driving module and a resistance compensation module. The data driving module is configured to transmit display data to the display panel through a plurality of data lines to drive the display panel to display. Among them, the resistance compensation module includes a plurality of resistance compensation units. Each resistance compensation unit is configured to be correspondingly connected to one of the data lines to perform resistance compensation on the trace impedance of the data line.

2. The display driving circuit according to claim 1, wherein Each resistance compensation unit includes at least one resistance compensation component. Each resistance compensation component includes at least one resistor and a switching element connected in parallel with the at least one resistor.

3. The display driving circuit according to claim 2, wherein The resistance compensation unit includes a first resistance compensation component and a second resistance compensation component. The first resistance compensation component includes a first resistor and a first switching element. The first switching element includes a first electrode connected to the first end of the first resistor, a second electrode connected to the second end of the first resistor, and a control electrode for receiving a first control signal. The second resistance compensation component includes a second resistor and a second switching element. The first end of the second resistor is connected to the second end of the first resistor. The second switching element includes a first electrode connected to the first end of the second resistor, a second electrode connected to the second end of the second resistor, and a control electrode for receiving a second control signal. The second end of the second resistor is connected to the data line.

4. The display driving circuit according to claim 2, wherein The resistance compensation unit includes a first resistance compensation component, a second resistance compensation component, and a third resistance compensation component. The first resistance compensation component includes a first resistor and a first switching element. The first switching element includes a first electrode connected to the first end of the first resistor, a second electrode connected to the second end of the first resistor, and a control electrode for receiving a first control signal. The second resistance compensation component includes a second resistor and a second switching element. The first end of the second resistor is connected to the second end of the first resistor. The second switching element includes a first electrode connected to the first end of the second resistor, a second electrode connected to the second end of the second resistor, and a control electrode for receiving a second control signal. The third resistance compensation component includes a third resistor and a third switching element. The first end of the third resistor is connected to the second end of the second resistor. The third switching element includes a first electrode connected to the first end of the third resistor, a second electrode connected to the second end of the third resistor, and a control electrode for receiving a third control signal. The second end of the third resistor is connected to the data line.

5. The display driving circuit according to any one of claims 1 to 4, characterized in that The resistance value in the resistance compensation unit has a negative correlation with the length of the data line connected to the resistance compensation unit.

6. The display driving circuit according to any one of claims 1 to 4, characterized in that, Each resistance compensation unit and the corresponding connected data line form a data driving line, and the resistance values of any two data driving lines are the same.

7. The display driving circuit according to any one of claims 1 to 4, characterized in that, The data driving module includes: a data input module, a shift register, a data buffer register connected to the data input module and the shift register, a data latch connected to the data buffer register, a level conversion module connected to the data latch, a gamma voltage module, a digital-to-analog conversion module connected to the level conversion module and the gamma voltage module, and an output buffer module connected to the digital-to-analog conversion module; wherein, the resistor compensation module is connected to the output buffer module.

8. A display device, characterized in that, The display device includes the display driving circuit according to any one of claims 1 to 7 and a display panel, and the display driving circuit is configured to transmit display data to the display panel.

9. The display device according to claim 8, wherein The display panel includes a plurality of pixel columns, and each of the resistor compensation units is connected to one of the pixel columns through one of the data lines; the data driving module transmits the display data to the pixel columns through the resistor compensation units and the data lines.

10. The display device according to claim 8 or 9, characterized in that, The display device includes a plurality of the display driving circuits, and the display device further includes a plurality of fan-out routing areas respectively corresponding to the plurality of display driving circuits. Each of the display driving circuits is connected to the display panel through the data lines in the corresponding fan-out routing area; wherein, at least two of the data lines connected to the same display driving circuit have different lengths.

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