Display control circuit and display device

Abstract

This application provides a display control circuit and a display device, relating to the field of display technology. The display control circuit includes a data detection module and a display control module. The data detection module is connected to the display control module and is used to detect multiple parameters in the image parameter signal output by a control board. If at least one of the parameters meets the target parameter specification, the data detection module outputs a first control signal to the display control module. The display control module is connected to both the control board and a display panel, and is used to receive the image parameter signal output by the control board. Upon receiving the first control signal, the display control module outputs a display driving signal to the display panel based on the image parameter signal. The display driving signal triggers the display panel to display an image. The technical solution provided by this application can avoid unnecessary display abnormalities and improve the reliability of the display device.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a display control circuit and display device. Background Technology

[0002] Liquid crystal displays (LCDs) have advantages such as being lightweight, thin, low-power, and high-resolution, and are widely used in display products such as televisions, computer monitors, and mobile phones.

[0003] In liquid crystal display (LCD) devices, the display panel (open-cell) refers to a semi-finished product where cell segments have been assembled but not yet packaged. The display panel passively receives display signals for display. In actual assembly, the display panel usually needs to be paired with control boards from different manufacturers. The display parameter specifications of the image parameter signals set by control boards from different manufacturers will vary. Therefore, it is possible for the display parameters to exceed the parameter specifications of the display panel. If the display parameters exceed the parameter specifications of the display panel, it will cause abnormalities in the display image or directly cause the display panel to enter Bist mode, unable to display a normal image. Summary of the Invention

[0004] In view of this, this application provides a display control circuit and display device to ensure the normal display of the display panel in scenarios where the display panel is paired with different control boards, avoid unnecessary abnormalities, be flexible and adjustable, and save costs.

[0005] To achieve the above objectives, in a first aspect, embodiments of this application provide a display control circuit, including: a data detection module and a display control module;

[0006] The data detection module is connected to the display control module and is used to detect multiple parameters in the image parameter signal output by the control board. When at least one parameter meets the target parameter specification, the module outputs a first control signal to the display control module.

[0007] The display control module is connected to the control board and the display panel respectively, and is used to receive the image parameter signal output by the control board, and to output a display driving signal to the display panel according to the image parameter signal when the first control signal is received. The display driving signal is used to trigger the display panel to display an image.

[0008] In one possible implementation of the first aspect, the first control signal includes at least one first trigger voltage and n second trigger voltages, where n is greater than or equal to 0. The first trigger voltage is used to indicate that a parameter value of the parameter conforms to the target parameter specification; the second trigger voltage is used to indicate that a parameter value of the parameter does not conform to the target parameter specification.

[0009] The display control module includes: a switching circuit, a control module, and a selection module; wherein, the control module is used to connect to the control board to obtain the image parameter signal, and to output a self-test signal and a display drive signal to the selection module according to the image parameter signal; the self-test signal is used to trigger the display panel to display a self-test screen;

[0010] The switching circuit is used to connect the data detection module and the selection module; the selection module is also connected to the control module and the display panel respectively; wherein, the switching circuit is used to output a level signal to the selection module according to at least one first trigger voltage and n second trigger voltages;

[0011] If the level signal is a first level signal, then the selection module is used to output the display driving signal;

[0012] If the level signal is the second level signal, then the selection module is used to output the self-test signal.

[0013] The data detection module detects various parameters, and the display control module can trigger the display panel to display different images based on the detection results, thereby reducing unnecessary image anomalies.

[0014] In one possible implementation of the first aspect, if the parameter values ​​of a preset number of the parameters among the plurality of parameters do not conform to the target parameter specification, the first control signal includes at least a preset number of second trigger voltages;

[0015] The data detection module is further configured to: output a second control signal to the display control module when the parameter values ​​of the preset number of parameters among the plurality of parameters do not conform to the target parameter specification;

[0016] The display control module is also used to output a self-test signal to the display panel when the second control signal is received, and the self-test signal is used to trigger the display panel to display a self-test screen.

[0017] Through the above implementation method, if a preset number of parameters in the detection parameters do not meet the target parameter specifications, the display control module can output a second control signal to the display control module, and the display control module can display a self-test screen on the display panel according to the second control signal.

[0018] In one possible implementation of the first aspect, the data detection module includes a plurality of sub-output terminals, any one of which is used to output a first voltage or a second voltage; the first voltage is used to indicate that a parameter value of one of the parameters conforms to the target parameter specification; the second voltage is used to indicate that a parameter value of the parameter does not conform to the target parameter specification;

[0019] The switching circuit includes: a plurality of first switching transistors, the input terminal of each first switching transistor is used to receive the first level signal, and the output terminal of each first switching transistor is connected to the control terminal of the selection module;

[0020] The control terminal of each first switch is connected to each of the sub-output terminals in a one-to-one correspondence. Any first switch is turned on when the first trigger voltage is output at the corresponding sub-output terminal, and turned off when the second trigger voltage is output at the corresponding sub-output terminal of any first switch.

[0021] The first or second trigger voltage output from the sub-output terminal can control the on / off state of the first switching transistor, thereby controlling the selection module.

[0022] In one possible implementation of the first aspect, the selection module includes a second switch and a third switch;

[0023] The control terminals of the second and third switching transistors are both connected to the output terminal of the switching circuit.

[0024] The input terminal of the second switching transistor is connected to the first output terminal of the control module, the input terminal of the third switching transistor is connected to the second output terminal of the control module, and the output terminals of both the second and third switching transistors are connected to the display panel. The first output terminal is used to output the display drive signal, and the second output terminal is used to output the self-test signal.

[0025] Through the above implementation method, the output of the switching circuit can be used to control the on / off state of the second and third switching transistors, thereby controlling the selection module to select the signal output to the display panel.

[0026] In one possible implementation of the first aspect, the selection module includes a second switch and a third switch;

[0027] The control terminal of the second switching transistor is connected to the output terminal of the switching circuit, and the control terminal of the third switching transistor is connected to the output terminal of the second switching transistor.

[0028] The input terminal of the second switching transistor is connected to the first output terminal of the control module, the input terminal of the third switching transistor is connected to the second output terminal of the control module, and the output terminals of both the second and third switching transistors are connected to the display panel. The first output terminal is used to output the display drive signal, and the second output terminal is used to output the self-test signal.

[0029] By implementing the above methods, the situation where the second and third switching transistors are turned on simultaneously, resulting in the simultaneous output of the display drive signal and the self-test signal to the display panel, can be reduced, thereby improving the reliability of the display control circuit.

[0030] In one possible implementation of the first aspect,

[0031] The selection module includes a first AND gate, a second AND gate, a NOT gate, and an OR gate;

[0032] The output terminal of the switching circuit is connected to the first input terminal of the first AND gate, and is connected to the first input terminal of the second AND gate through the NOT gate;

[0033] The second input terminal of the first AND gate is connected to the first output terminal of the control module, the second input terminal of the second AND gate is connected to the second output terminal of the control module, the output terminal of the first AND gate is connected to the first input terminal of the OR gate, the output terminal of the second AND gate is connected to the second input terminal of the OR gate, and the output terminal of the OR gate is connected to the display panel.

[0034] The above implementation methods can effectively improve the response speed and stability of the selection module.

[0035] In one possible implementation of the first aspect, the display control circuit further includes a plurality of comparison circuits, wherein a first input terminal of any of the comparison circuits is connected to a sub-output terminal of the data detection module, a second output terminal of the comparison circuit is used to acquire a preset voltage, and an output terminal of the comparison circuit is used to connect to the control terminal of a first switching transistor included in the switching circuit.

[0036] The comparator circuit is used to output the first trigger voltage through the output terminal when the first voltage output at any of the sub-output terminals is greater than or equal to the preset voltage; and to output the second trigger voltage through the output terminal when the second voltage output at any of the sub-output terminals is less than the preset voltage.

[0037] Through the above implementation method, when the first voltage is lower than the conduction threshold voltage of the first switching transistor, the first switching transistor can be turned on by outputting a first trigger voltage through the comparison circuit, so as not to affect the control module's output of display drive signals to the display panel.

[0038] In one possible implementation of the first aspect, a data modification circuit is connected between the comparison circuit and the corresponding first switching transistor;

[0039] The data modification circuit is used to correct the first trigger voltage output by the comparison circuit, and the corrected first trigger voltage is greater than the threshold turn-on voltage of the first switch.

[0040] Through the above implementation method, the first trigger voltage can be modified so that the first trigger voltage can turn on the first switching transistor, thereby improving the reliability of the display control circuit.

[0041] Secondly, embodiments of this application provide a display device, including: a display panel and a display control circuit as described in the first aspect or any of the first aspects, or the display device includes a display panel, and the display panel integrates the display control circuit as described in the first aspect or any of the first aspects.

[0042] Thirdly, embodiments of this application provide a display system, including the display device and control board described in the second aspect.

[0043] The display control circuit and display device provided in this application embodiment include a data detection module and a display control module. The data detection module is connected to the display control module and is used to detect multiple parameters in the image parameter signal output by the control board. If at least one parameter meets the target parameter specification, the data detection module outputs a first control signal to the display control module. The display control module is connected to both the control board and the display panel. It receives the image parameter signal output by the control board, generates a display driving signal based on the image parameter signal, and outputs a display driving signal to the display panel upon receiving the first control signal. The display driving signal drives the display panel to display an image. By detecting multiple parameters in the image parameter signal, normal display of the display panel can be ensured, unnecessary display anomalies can be reduced, thereby improving the reliability of the display device and ultimately enhancing the user experience. Attached Figure Description

[0044] Figure 1 This is a structural block diagram of the display control circuit provided in an embodiment of this application;

[0045] Figure 2 This is a structural block diagram of the display control module provided in an embodiment of this application;

[0046] Figure 3 A circuit diagram of a first type of display control circuit provided in an embodiment of this application;

[0047] Figure 4 A circuit diagram of the first selection module provided in the embodiments of this application;

[0048] Figure 5 A circuit diagram of the second selection module provided in the embodiments of this application;

[0049] Figure 6 A circuit diagram of the third selection module provided in the embodiments of this application;

[0050] Figure 7 A circuit diagram of a second display control circuit provided in an embodiment of this application;

[0051] Figure 8 A circuit diagram of a third display control circuit provided in the embodiments of this application;

[0052] Figure 9 A circuit diagram of a fourth display control circuit provided in the embodiments of this application;

[0053] Figure 10 Provided for the embodiments of this application Figure 9 Circuit diagram of a comparator.

[0054] Explanation of reference numerals in the attached figures:

[0055] 100 - Data detection module; 101 - First sub-output terminal; 102 - Second sub-output terminal; 103 - Third sub-output terminal;

[0056] 200 - Display control module; 210 - Switching circuit; 220 - Control module; 230 - Selection module;

[0057] 231 - First AND gate; 232 - Second AND gate; 233 - NOT gate; 234 - OR gate;

[0058] 240 - Comparator circuit; 241 - NAND gate; 242 - Third AND gate; 243 - Fourth AND gate; 244 - NOR gate;

[0059] 250 - Preset module; 260 - Data modification circuit;

[0060] 300 - Control panel; 400 - Display panel. Detailed Implementation

[0061] The terminology used in the implementation section of this application is only for explaining specific embodiments of this application and is not intended to limit this application. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0062] The image parameter signal output by the control board can include various parameters, such as frame parameters, horizontal effective pixel parameters, and vertical effective pixel parameters. As an image display device, the display panel cannot determine whether the parameters in the image parameter signal are abnormal. However, if the parameter specifications of the image parameter signal sent by the control board exceed the parameter specifications of the display panel, the display panel will still display the image content corresponding to the abnormal parameters, thus presenting the abnormal parameter signal sent by the control board to the user.

[0063] To reduce the impact of abnormal parameters on display quality, one approach is to detect a parameter. If this parameter does not conform to specifications, it is determined to be abnormal, and the display panel enters a self-test mode (Bist), affecting the user's viewing experience. This detection method also determines that the image parameter signal is abnormal when the detected parameter experiences occasional fluctuations. However, these occasional fluctuations do not affect the actual display, and existing timing controllers can smooth out fluctuations within a very small range. Therefore, they typically have a certain compensating and repairing effect on occasional fluctuations, reducing their impact on display quality.

[0064] In view of this, embodiments of this application provide a display control circuit that can reduce unnecessary display abnormalities on the display panel and ensure normal display of the display panel.

[0065] Figure 1 This is a structural block diagram of the display control circuit provided in an embodiment of this application. Figure 1 As shown, the display control circuit may include a data detection module 100 and a display control module 200. The data detection module 100 may be connected to the display control module 200 and is used to detect multiple parameters in the image parameter signal output by the control board 300. When at least one parameter meets the target parameter specification, the data detection module 100 may output a first control signal to the display control module 200.

[0066] The display control module 200 can be connected to the data detection module 100, the control board 300, and the display panel 400 respectively, and is used to receive image parameter signals output by the control board 300. Upon receiving the first control signal, the display control module 200 can also output a display drive signal to the display panel 400 according to the image parameter signal, thereby triggering the display panel to display the corresponding image.

[0067] The control board 300 can be a motherboard or other circuit board used to output image parameter signals, and this application embodiment does not impose any special limitations on it.

[0068] The first control signal may include at least one first trigger voltage and n second trigger voltages, where n may be greater than or equal to 0. The first trigger voltage may indicate that the parameter value conforms to the target parameter specification, and the second trigger voltage may indicate that the parameter value does not conform to the target parameter specification.

[0069] Figure 2 This is a structural block diagram of the display control module provided in an embodiment of this application. Figure 2 As shown, the display control module 200 may include a switch circuit 210, a control module 220, and a selection module 230. The control module 220 can be connected to the control board 300 to acquire image parameter signals. The control module 220 can also output a self-test signal and a display drive signal to the selection module 230 based on the image parameter signals. The self-test signal can trigger the display panel 400 to display a self-test screen. The self-test screen can be a screen indicating abnormal parameter specifications of the control board 300; it can be a solid color screen or a prompt screen, etc. This embodiment does not impose any special limitations on the content displayed on the self-test screen.

[0070] The switching circuit 210 can be connected to the data detection module 100 and the selection module 230 respectively. The selection module 230 can also be connected to the control module 220 and the display panel 400 respectively. The switching circuit 210 can output a level signal to the selection module 230 according to at least one first trigger voltage and n second trigger voltages.

[0071] In some embodiments, the level signal can be a first level signal (e.g., high level), in which case the selection module 230 can output a display drive signal. In other embodiments, the level signal can also be a second level signal (e.g., low level), in which case the selection module 230 can output a self-test signal.

[0072] In one optional implementation, if the parameter values ​​of a preset number of parameters among multiple parameters do not conform to the target parameter specification, the first control signal may include at least a preset number of second trigger voltages. The preset number can be set according to actual needs. For example, if the total number of parameters detected by the data detection module 100 is 10, then the preset number can be set to at least 5. If the parameter values ​​of more than 5 parameters do not conform to the target parameter specification, the first control signal will also include at least 5 or more second trigger signals.

[0073] The data detection module 100 is also used to output a second control signal to the display control module 200 when the parameter values ​​of a preset number of parameters among multiple parameters do not conform to the target parameter specifications. The display control module 200 is also used to output a self-test signal to the display panel 400 upon receiving the second control signal, and the self-test signal is used to trigger the display panel 400 to display a self-test screen.

[0074] The embodiments of this application are described below with reference to the accompanying drawings.

[0075] Figure 3 This is a circuit diagram of a first type of display control circuit provided in an embodiment of this application. (See diagram below.) Figure 3 As shown, the display control module 200 may include: a switch circuit 210, a control module 220, and a selection module 230.

[0076] In some embodiments, the switching circuit 210 may include a plurality of first switching transistors T1. The figure illustrates an example of the switching circuit 210 including three first switching transistors T1, namely switching transistor T11, switching transistor T12, and switching transistor T13. The input terminal of each first switching transistor T1 can be connected to a first level signal (such as a high level, abbreviated as HL). The output terminal of each first switching transistor T1 is connected to the control terminal of the selection module 230 through an output signal terminal. The output signal terminal and the control terminal of the selection module 230 can be connected through an output signal line OL.

[0077] The output of the data detection module 100 may include multiple sub-outputs (not shown), each of which can output the detection result of a parameter. If the parameter value of at least one parameter meets the target parameter specification, the first control signal includes the detection results output by each of the sub-outputs. If the parameter corresponding to any sub-output meets the target parameter specification, the sub-output can output a first voltage as the detection result; if the parameter corresponding to any sub-output does not meet the target parameter specification, any sub-output can output a second voltage as the detection result.

[0078] In some embodiments, the data detection module 100 may further include multiple sub-detection modules (not shown), each sub-detection module can test a parameter, and after the test is completed, each sub-detection module outputs the corresponding detection result through its own sub-output terminal.

[0079] Taking frame parameters, horizontal effective pixel parameters, and vertical effective pixel parameters as examples, after detecting these three parameters, the corresponding detection results can be output through the sub-output terminal. Each detection result can indicate whether the corresponding parameter meets the target parameter specifications. Specifically, the detection result can be a first voltage if the corresponding parameter meets the target parameter specifications, and a second voltage if the corresponding parameter does not meet the target parameter specifications.

[0080] The control terminal of each first switch transistor T1 can be connected to each sub-output terminal in a one-to-one correspondence. The first switch transistor T1 can be turned on when the detection result output by the corresponding sub-output terminal is the first voltage, and turned off when the detection result output by the corresponding sub-output terminal is the second voltage. That is, at least one of the detection results in the first control signal can be the first voltage, and all the detection results in the second control signal can be the second voltage.

[0081] The first switching transistor T1 can be either an N-channel metal-oxide-semiconductor (NMOS) or a P-channel metal-oxide-semiconductor (PMOS). Taking a high-level signal as the first voltage and a low-level signal (0 level) as the second voltage as an example, the NMOS can be turned on under the action of the first voltage and turned off under the action of the second voltage; the PMOS is turned off under the action of the first voltage and turned on under the action of the second voltage.

[0082] Of course, the first voltage can also be a low-level signal, and the second voltage can also be a high-level signal. Accordingly, the first switching transistor T1 can be selected as a low-level switching transistor. For ease of explanation, the following description will use an NMOS transistor as the first switching transistor T1.

[0083] Continuing with the example of three parameters—frame parameters, horizontal effective pixel parameters, and vertical effective pixel parameters—if the frame parameters meet the target parameter specifications, but the horizontal and vertical effective pixel parameters do not, after the data detection module 100 completes the parameter detection of the three parameters, the data detection module 100 can output the detection result to the corresponding switch T11 through the first sub-output terminal 101. This detection result is the first voltage. The data detection module 100 can also output the detection result to the corresponding switch T12 through the second sub-output terminal 102. This detection result is the second voltage. The data detection module 100 can also output the detection result to the corresponding switch T13 through the third sub-output terminal 103. This detection result is the second voltage.

[0084] Switch T11 can be turned on under the action of a first voltage, while switches T12 and T13 can be turned off under the action of a second voltage. A high-level signal HL can be output to the output signal terminal through switch T11, causing the output signal terminal to also be loaded with a high level. If none of the three parameters meet the target parameter specifications, switches T11, T12, and T13 are all turned off, causing the output signal terminal to be loaded with a low level.

[0085] In other words, if there are parameters that meet the target parameter specifications among the parameters detected by the data detection module 100, at least one of the first switching transistors T1 can be turned on, and the switching circuit 210 can output a high level to the control terminal of the selection module 230. Conversely, if there are no parameters that meet the target parameter specifications, all the switching transistors in the first switching transistors T1 are turned off, and the switching circuit 210 will output a low level to the control terminal of the selection module 230.

[0086] In some embodiments, the output terminal of the data detection module 100 may not include a voltage regulator circuit. Considering the differences in voltage of image parameter signals output by control boards 300 from different manufacturers, the first voltage (all higher than the low level) output by the data detection module 100 after detecting parameters that meet the target parameter specifications may not be a fixed value. Therefore, in this embodiment, the conduction threshold voltages of switching transistors T11, T12, and T13 may be different. This ensures that, even when parameters meet the target parameter specifications, the first voltage output by the sub-output terminal can guarantee that at least one first switching transistor T1 can be turned on, thereby improving the reliability of the display control circuit. The minimum value of the switching transistor conduction threshold voltage can be obtained based on historical data, experimental analysis, etc., and this embodiment does not impose any particular limitations on this.

[0087] In some other embodiments, the data detection module 100 may include a voltage regulator circuit or other circuits that can make the voltage value output by the sub-output terminal of the data detection module 100 fixed. In this case, the conduction threshold voltage of the first switching transistor T1 can be the same, thereby simplifying the logic and reducing procurement costs.

[0088] The control module 220 can generate display drive signals and self-test signals, and output the display drive signals to the selection module 230 through the first output terminal. The control module 220 can also output the self-test signals to the selection module 230 through the second output terminal.

[0089] The control terminal of the selector module 230 is connected to the output signal terminal. When the output signal terminal outputs a high-level signal, a display drive signal is output to the display panel 400. When the output signal terminal outputs a low-level signal, a self-test signal is output to the display panel 400.

[0090] As an alternative implementation method, Figure 4 The circuit diagram of the first selection module provided in the embodiments of this application is as follows: Figure 4 As shown, the selection module 230 may include a second switch T2 and a third switch T3. The second switch T2 and the third switch T3 have different conduction mechanisms; for example, the second switch T2 can be turned on at a high level, while the third switch T3 can be turned on at a low level.

[0091] The control terminals of the second switch T2 and the third switch T3 can both be connected to the output signal terminal via the output signal line OL; the input terminal of the second switch T2 is connected to the first output terminal of the control module 220, the input terminal of the third switch T3 is connected to the second output terminal of the control module 220, and the output terminals of both the second switch T2 and the third switch T3 can be connected to the display panel 400.

[0092] Through the above implementation, when the data detection module 100 detects the presence of parameters that meet the target parameter specifications, at least one first switch T1 in the switching circuit 210 can be turned on, and a high-level signal can be applied to the output signal terminal, thereby turning on the second switch T2 and turning off the third switch T3. This allows the control module 220 to output a display drive signal to the display panel 400 through the first output terminal. Conversely, when the data detection module 100 detects the absence of parameters that meet the target parameter specifications, all first switch T1s in the switching circuit 210 can be turned off, and a low-level signal can be applied to the output signal terminal, thereby turning off the second switch T2 and turning on the third switch T3. This allows the control module 220 to output a self-test signal to the display panel 400 through the second output terminal.

[0093] Of course, the input terminals of each first switch T1 can also be connected to a low-level signal. Correspondingly, the second switch T2 can be a PMOS that conducts at a low level, and the third switch T3 can be an NMOS that conducts at a high level.

[0094] Considering that the on / off state of the first switch transistor T1 in the switching circuit 210 frequently switches during the parameter detection process, for example, when displaying the first frame, all first switch transistors T1 are turned on, and when displaying the second frame, all first switch transistors T1 are turned off, the voltage is prone to unstable voltage during the high-frequency jump process, and static electricity residue appears at the second switch transistor T2 and the third switch transistor T3, causing the conduction threshold voltage of the second switch transistor T2 and the third switch transistor T3 to drift, resulting in a situation where they are turned on at the same time. This allows the control module 220 to output display drive signals and self-test signals to the display panel 400 at the same time, resulting in a decrease in display quality.

[0095] As another alternative implementation method, Figure 5 The circuit diagram of the second selection module provided in the embodiments of this application is as follows: Figure 5 As shown, the main difference between the second selection module and the first selection module is that the control terminal of the third switch T3 is not connected to the output signal terminal, but is connected to the output terminal of the second switch T2.

[0096] By connecting the control terminal of the third switch T3 to the output terminal of the second switch T2, the third switch T3 is always turned off under the action of the display drive signal during the process of the control module 220 outputting the display drive signal (high level) to the display panel 400. This allows the type of signal output by the selection module 230 to the display panel 400 to be determined by the switching circuit 210, thus preventing the display drive signal and the self-test signal from being output to the display panel 400 at the same time, thereby improving the reliability of the display control circuit.

[0097] As another optional implementation, the selection module 230 can be a selector composed of AND gates, OR gates, and NOT gates. Specifically, Figure 6 The circuit diagram of the third selection module provided in the embodiments of this application is as follows: Figure 6 As shown, the selector may include: a first AND gate 231, a second AND gate 232, a NOT gate 233, and an OR gate 234.

[0098] The output signal terminal can be connected to the first input terminal of the first AND gate 231 via the output signal line OL, and to the first input terminal of the second AND gate 232 via the NOT gate 233. The second input terminal of the first AND gate 231 can be connected to the first output terminal of the control module 220, the second input terminal of the second AND gate 232 can be connected to the second output terminal of the control module 220, the output terminal of the first AND gate 231 can be connected to the first input terminal of the first OR gate 234, the output terminal of the second AND gate 232 can be connected to the second input terminal of the OR gate 234, and the output terminal of the OR gate 234 can be connected to the display panel 400.

[0099] The logic function expression of the selector can be: Y = / SD1 + SD2, where S represents the level applied to the output signal terminal, / represents the inversion of the level applied to the output signal terminal, D1 represents the high level output by the first output terminal of the control module 220, and D2 represents the high level output by the second output terminal of the control module 220. That is, when a high level is applied to the output signal terminal, the signal output by the first AND gate 231 (i.e., the display drive signal) can be high, and the output of the second AND gate 232 can be low. After passing through the OR gate 234, the display drive signal can be output to the display panel 400. When a low level is applied to the output signal terminal, the output of the first AND gate 231 can be low, and the signal output by the second AND gate 232 (i.e., the self-test signal) is high. After passing through the OR gate 234, the self-test signal can be output to the display panel 400.

[0100] The embodiments of this application utilize logic devices to construct selectors, which can effectively improve the response speed and stability of the selection module.

[0101] Considering that the turn-on threshold voltages of switching transistors T11, T12, and T13 in the first display control circuit are different, and that the voltage value of the first voltage output by the data detection module 100 is not a fixed value, in an optional implementation, the display control module may further include multiple comparison circuits 240. Each sub-output terminal of the data detection module 100 can be connected to the corresponding switching transistor through the comparison circuit 240. The first input terminal of the comparison circuit 240 can be connected to the corresponding sub-output terminal, and the second input terminal can be used to obtain a preset voltage.

[0102] In one possible implementation, the comparator circuit 240 can be a comparator. Figure 7 A circuit diagram of the second display control circuit provided in the embodiments of this application is shown in the attached diagram. Figure 7 The diagram shows three comparators: A11 (first comparator), A12 (second comparator), and A13 (third comparator). Each sub-output of the data detection module 100 can be connected to the corresponding first switching transistor T1 via a comparator. The first input of the comparator (or non-inverting input) is connected to the corresponding sub-output, the second input of the comparator (or inverting input) can be used to input a preset voltage, and the output of the comparator can be connected to the control terminal of the corresponding first switching transistor T1.

[0103] Each comparator has a different preset voltage, and all of them are less than the turn-on threshold voltage of the connected first switch T1. The preset voltage can be output by the control module 220 or the voltage module (not shown), and the voltage value of the preset voltage can be set according to actual needs.

[0104] Specifically, the non-inverting input of the first comparator A11 is connected to the first sub-output 101, and the inverting input receives a first preset voltage Y1, the value of which can be less than the turn-on threshold voltage of the switching transistor T11. The non-inverting input of the second comparator A12 is connected to the second sub-output 102, and the inverting input receives a second preset voltage Y2, the value of which can be less than the turn-on threshold voltage of the switching transistor T12. The non-inverting input of the third comparator A13 is connected to the third sub-output 103, and the inverting input receives a third preset voltage Y3, the value of which can be less than the turn-on threshold voltage of the switching transistor T13.

[0105] If the data detection module 100 detects that the frame parameters meet the target parameter specifications, but the horizontal and vertical effective pixel parameters do not meet the target parameter specifications, it can output a first voltage through the first sub-output terminal 101, and a second voltage through the second sub-output terminal 102 and the third sub-output terminal 103. The output terminals of the second comparator A12 and the third comparator A13 will still output a low level. However, for the first comparator A11, even if the first voltage is lower than the conduction threshold voltage of the switch T11, the high level output by the first comparator A11 can still turn on the switch T11, thereby enabling the control module 220 to output a display drive signal to the display panel 400, which can improve the reliability of the display control circuit.

[0106] It should be noted that, Figure 7 Taking the selection module 230 as an example of the second selection module provided in the embodiment of this application, in some other embodiments, the selection module 230 may also be the first selection module and the third selection module provided in the embodiment of this application.

[0107] In some embodiments, in order to reduce the load on the display control module 200, in some embodiments, Figure 8 The circuit diagram of the third display control circuit provided in the embodiments of this application is as follows: Figure 8 As shown, the display control module 200 may also include a preset module 250, which can be connected to the display control module 200 to receive power supply.

[0108] There can be multiple preset modules 250, each corresponding to a comparator circuit 240, facilitating the output of a preset voltage to the second input terminal of the corresponding comparator circuit 240. When the comparator circuit 240 is a selector, the inverting input terminal of each comparator can be connected to one preset module 250 to obtain the preset voltage.

[0109] In some other embodiments, the preset module 250 can be a single module, such as... Figure 8 As shown, the preset module 250 may include multiple output terminals, each of which can be connected to the second input terminal of the comparator circuit 240 to output a preset voltage to the corresponding comparator circuit 240. When the comparator circuit 240 is a selector, each output terminal of the preset module 250 can be connected to the second input terminal of each comparator circuit 240, which simplifies the circuit structure, reduces costs, and facilitates the modification of the preset voltage value of the preset module 250.

[0110] Considering that different manufacturers output image parameter signal formats, the data detection module 100 may output different levels of detection results from each sub-output terminal when detecting image parameter signals from different manufacturers, even if the parameters meet the target parameter specifications.

[0111] For example, when the data detection module detects the image parameter signal from manufacturer A, it can output a high-level result if the parameters meet the target specifications. When the data detection module detects the image parameter signal from manufacturer B, it can output a low-level result if the parameters meet the target specifications. In the case where the detection result can output a low level even when the parameters meet the target specifications, the first switch T1 in the above scheme cannot conduct, causing the display control circuit to malfunction. Replacing the first switch T1 would not only increase costs but also reduce detection efficiency.

[0112] In one alternative implementation, the comparator circuit 240 can be a digital comparator. For example... Figure 9 As shown, each sub-output terminal of the data detection module 100 can be connected to the corresponding first switching transistor T1 via a digital comparator. Specifically, as... Figure 10 As shown, the digital comparator may include NAND gate 241, third AND gate 242, fourth AND gate 243, and NOR gate 244.

[0113] The first input terminal of NAND gate 241 can be connected to the sub-output terminal of data detection module 100. The second input terminal is used to obtain a preset voltage. The output terminal of NAND gate 241 can be connected to the first input terminal of third AND gate 242 and the second output terminal of fourth AND gate 243 respectively. The second input terminal of third AND gate 242 is connected to the second input terminal of NAND gate 241. The first input terminal of fourth AND gate 243 is connected to the first input terminal of NAND gate 241. The output terminals of third AND gate 242 and fourth AND gate 243 are respectively connected to the two input terminals of NOR gate 244. The output terminal of NOR gate 244 is connected to the control terminal of the switching transistor.

[0114] It should be noted that, Figure 9 Taking the display control module providing the preset voltage as an example, in some embodiments, the preset voltage can also be provided by the preset module 250.

[0115] The first sub-output terminal 101 outputs the detection result and compares it with a preset voltage. When the preset voltage and the detection result are approximately equal in level (within a small difference, within the specified range), the digital comparator outputs a high level. When the preset voltage and the detection result are not equal in level, the digital comparator outputs a low level. The preset voltage level can be determined by the data detection module 100 after pre-detecting the normal image parameter signals output from the manufacturer's control board 300.

[0116] Compared to the comparator in the second type of display control circuit, the digital comparator provided in this application embodiment does not involve the calculation of analog values, has a faster response, and requires less computing resources and time, thereby improving the practicality of the display control circuit.

[0117] Continuing with the example of comparator circuit 240 as a digital comparator, please refer to... Figure 9 A data modification circuit 260 can be connected between the digital comparator and the corresponding first switching transistor T1. The data modification circuit 260 can be used to correct the voltage output by the digital comparator so that the corrected voltage can turn on the corresponding sub-switching transistor when the corresponding detection result is the first voltage.

[0118] By setting up a digital comparator and a data modification circuit 260, the detection result output from the sub-output terminal, whether high or low level, can ensure that at least one first switch transistor T1 is turned on, provided that the parameters meet the target parameter specifications. This allows the display control module to send display drive signals to the display panel 400 without replacing the first switch transistor T1, thereby improving the reliability of the display control circuit.

[0119] This application provides a display control circuit, which may include a data detection module and a display control module. The data detection module is connected to the display control module and is used to detect multiple parameters in the image parameter signal output by the control board. If at least one parameter meets the target parameter specification, the data detection module outputs a first control signal to the display control module. The display control module is connected to both the control board and the display panel. It receives the image parameter signal output by the control board, generates a display drive signal based on the image parameter signal, and, upon receiving the first control signal, outputs a display drive signal to the display panel to drive the display panel to display an image. The technical solution provided by this application can improve the accuracy of display parameters.

[0120] Based on the same inventive concept, embodiments of this application also provide a display device. See also... Figure 1 The display device may include the display control circuit described in any of the above embodiments, wherein the display control circuit may include a data detection module 100 and a display control module 200.

[0121] In some embodiments, the display device includes a display panel 400, which integrates the aforementioned display control circuit.

[0122] Since the display device in this embodiment includes the display control circuit in the above embodiments, the display device in this embodiment has all the technical features and effects of the above-described display control circuit embodiments. For details, please refer to the above embodiments, and they will not be repeated here.

[0123] This application also provides a display system, including the display device and control board described in the above embodiments.

[0124] It should be understood that in the description of this application and the appended claims, the terms "comprising," "including," "having," and any variations thereof are intended to cover non-exclusive inclusion and mean "including but not limited to," unless otherwise specifically emphasized.

[0125] In the description of this application, unless otherwise stated, " / " indicates that the objects before and after are in an "or" relationship. For example, A / B can mean A or B. "And / or" in this application is used to describe the relationship between the related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. A and B can be singular or plural.

[0126] Furthermore, in the description of this application, unless otherwise stated, "multiple" means two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items.

[0127] Furthermore, it should be understood in the description of this application that the terms "longitudinal," "horizontal," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0128] In this application, unless otherwise expressly specified and limited, the terms "connection" and "linkage" should be interpreted broadly. For example, they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise expressly limited, those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0129] Furthermore, in the description of this application and the appended claims, the terms "first," "second," etc., are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in a sequence other than that illustrated or described herein; features defined as "first" or "second" may explicitly or implicitly include at least one of those features.

[0130] In the embodiments of this application, the words "exemplarily" or "for example" are used to indicate examples, illustrations, or explanations. Any embodiment or design described as "exemplarily" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design solutions. Specifically, the use of the words "exemplarily" or "for example" is intended to present the relevant concepts in a specific manner.

[0131] References to "one embodiment" or "some embodiments" in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized.

[0132] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A display control circuit, characterized in that, include: Data detection module and display control module; The data detection module is connected to the display control module and is used to detect multiple parameters in the image parameter signal output by the control board. When the parameter value of at least one of the parameters meets the target parameter specification, the module outputs a first control signal to the display control module. The display control module is connected to both the control board and the display panel and is used to receive the image parameter signal output by the control board. When the first control signal is received, the module outputs a display drive signal to the display panel according to the image parameter signal. The display drive signal is used to trigger the display panel to display an image. The first control signal includes at least one first trigger voltage and n second trigger voltages, where n is greater than or equal to 0. The first trigger voltage is used to indicate that the parameter value of one of the parameters conforms to the target parameter specification. The second trigger voltage is used to indicate that the parameter value does not conform to the target parameter specification; The display control module includes a switching circuit, a control module, and a selection module. The control module connects to the control board to acquire the image parameter signal and outputs a self-test signal and a display drive signal to the selection module based on the image parameter signal. The self-test signal triggers the display panel to display a self-test screen. The switching circuit connects the data detection module and the selection module. The selection module is also connected to the control module and the display panel. The switching circuit outputs a level signal to the selection module based on at least one first trigger voltage and n second trigger voltages. If the level signal is a first level signal, the selection module outputs the display drive signal; if the level signal is a second level signal, the selection module outputs the self-test signal.

2. The display control circuit according to claim 1, characterized in that, If the parameter values ​​of a predetermined number of the parameters among the plurality of parameters do not conform to the target parameter specification, the first control signal includes at least a predetermined number of second trigger voltages; The data detection module is further configured to: output a second control signal to the display control module when the parameter values ​​of the preset number of parameters among the plurality of parameters do not conform to the target parameter specification; The display control module is also used to output a self-test signal to the display panel when the second control signal is received, and the self-test signal is used to trigger the display panel to display a self-test screen.

3. The display control circuit according to claim 1, characterized in that, The data detection module includes multiple sub-output terminals, any one of which is used to output a first voltage or a second voltage; the first voltage is used to indicate that the parameter value of one of the parameters conforms to the target parameter specification; The second voltage is used to indicate that the parameter value does not conform to the target parameter specification; The switching circuit includes: a plurality of first switching transistors, the input terminal of each first switching transistor is used to receive the first level signal, and the output terminal of each first switching transistor is connected to the control terminal of the selection module; The control terminal of each first switch is connected to each of the sub-output terminals in a one-to-one correspondence. Any first switch is turned on when the first trigger voltage is output at the corresponding sub-output terminal, and turned off when the second trigger voltage is output at the corresponding sub-output terminal of any first switch.

4. The display control circuit according to claim 1, characterized in that, The selection module includes a second switch and a third switch; The control terminals of the second and third switching transistors are both connected to the output terminal of the switching circuit. The input terminal of the second switching transistor is connected to the first output terminal of the control module, the input terminal of the third switching transistor is connected to the second output terminal of the control module, and the output terminals of both the second and third switching transistors are connected to the display panel. The first output terminal is used to output the display drive signal, and the second output terminal is used to output the self-test signal.

5. The display control circuit according to claim 1, characterized in that, The selection module includes a second switch and a third switch; The control terminal of the second switching transistor is connected to the output terminal of the switching circuit, and the control terminal of the third switching transistor is connected to the output terminal of the second switching transistor. The input terminal of the second switching transistor is connected to the first output terminal of the control module, the input terminal of the third switching transistor is connected to the second output terminal of the control module, and the output terminals of both the second and third switching transistors are connected to the display panel. The first output terminal is used to output the display drive signal, and the second output terminal is used to output the self-test signal.

6. The display control circuit according to claim 1, characterized in that, The selection module includes a first AND gate, a second AND gate, a NOT gate, and an OR gate; The output terminal of the switching circuit is connected to the first input terminal of the first AND gate, and is connected to the first input terminal of the second AND gate through the NOT gate; The second input terminal of the first AND gate is connected to the first output terminal of the control module, the second input terminal of the second AND gate is connected to the second output terminal of the control module, the output terminal of the first AND gate is connected to the first input terminal of the OR gate, the output terminal of the second AND gate is connected to the second input terminal of the OR gate, and the output terminal of the OR gate is connected to the display panel.

7. The display control circuit according to any one of claims 1 to 6, characterized in that, The display control circuit further includes multiple comparison circuits. The first input terminal of any of the comparison circuits is connected to a sub-output terminal of the data detection module, and the second output terminal of the comparison circuit is used to obtain a preset voltage. The output terminal of the comparison circuit is used to connect to the control terminal of a first switching transistor included in the switching circuit. The comparator circuit is used to output the first trigger voltage through the output terminal when the first voltage output at any of the sub-output terminals is greater than or equal to the preset voltage; and to output the second trigger voltage through the output terminal when the second voltage output at any of the sub-output terminals is less than the preset voltage.

8. The display control circuit according to claim 7, characterized in that, A data modification circuit is connected between the comparison circuit and the corresponding first switching transistor. The data modification circuit is used to correct the first trigger voltage output by the comparison circuit, and the corrected first trigger voltage is greater than the threshold turn-on voltage of the first switch.

9. A display device, characterized in that, include: The display panel and the display control circuit as described in any one of claims 1 to 8, or the display device includes a display panel in which the display control circuit as described in any one of claims 1 to 8 is integrated.

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