A detection device for locking signal

Abstract

The present application discloses a locking signal detection device, comprising: a control signal output module, for outputting a first control signal when receiving a frame synchronization signal; a locking signal acquisition module, the input end of the locking signal acquisition module is used to receive the locking signal, the control end of the locking signal acquisition module is used to receive the first control signal, and the locking signal acquisition module is used to transmit the locking signal to a first node when receiving the first control signal; a voltage comparison module, the first input end of the voltage comparison module is connected to the first node, and the second input end of the voltage comparison module is used to receive a preset voltage; the voltage comparison module is used to output a detection result of the locking signal according to the locking signal and the preset voltage, and the detection result is used to indicate whether the locking signal is in an unlocked state, so that it can quickly determine whether the locking signal is unlocked, thereby improving the working efficiency of the detection display device, and the present application has a simple structure and low cost, which is conducive to later maintenance and updating.

Description

Technical Field

[0001] The invention belongs to the technical field of debugging display equipment, and in particular relates to a detection device for a locking signal. Background Art

[0002] The timing control chip (TCON IC) and the driver chip (Driver IC), or the system-on-chip (SOC) and the driver chip, are connected and communicated through 1 or 2 pairs of differential signal lines (determined by the amount of data of the signal to be transmitted) and a lock signal line. The lock signal line is a single signal line connected to the source driver module (Source Driver), which is used by the source driver module to feedback the current state of the source driver module to the timing control chip (or system-on-chip). Generally, during normal display, the lock signal is always at a high level. If the phase-locked loop (PLL) of the lock signal is unlocked, the display module will not be able to display normally. In the related art, the omission of the step of confirming the lock signal leads to quality problems in the product.

[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to ordinary technicians in this field. Summary of the Invention

[0004] The present application provides a lock signal detection device, which aims to solve the problem in the related art that the lock signal cannot be detected quickly.

[0005] According to one aspect of an embodiment of the present application, a lock signal detection device is provided, including:

[0006] A control signal output module, configured to output a first control signal when receiving a frame synchronization signal;

[0007] a locking signal acquisition module, wherein an input end of the locking signal acquisition module is used to receive a locking signal, a control end of the locking signal acquisition module is used to receive a first control signal, and the locking signal acquisition module is used to transmit the locking signal to the first node upon receiving the first control signal;

[0008] A voltage comparison module, wherein the first input end of the voltage comparison module is connected to the first node, and the second input end of the voltage comparison module is used to receive a preset voltage; the voltage comparison module is used to output a detection result of the locking signal based on the locking signal and the preset voltage, and the detection result is used to indicate whether the locking signal is in an unlocked state.

[0009] In one embodiment provided in the present application, the detection device also includes a power control module, the first end of the power control module is connected to the input end of the power input signal of the display device, the control end of the power control module is used to receive the detection result, and the power control module is used to control the power input signal to input the display device or to ground according to the detection result.

[0010] In one embodiment provided in the present application, the power control module includes a first switch tube, the first end of the first switch tube is connected to the input end of the power input signal of the display device, the control end of the first switch tube is used to receive the detection result, and the second end of the first switch tube is grounded.

[0011] In one embodiment provided in the present application, the voltage comparison module includes a second switch tube, a first capacitor and a comparator; the control end of the second switch tube is connected to the input end of the control signal output module, the first end of the second switch tube is connected to the first node, the second end of the second switch tube is connected to the first end of the first capacitor, and the second end of the first capacitor is connected to the first end of the comparator; the second end of the comparator is used to receive a preset voltage, the power supply end of the comparator is connected to the output end of the power input signal, and the output end of the comparator is used to output the detection result.

[0012] In one embodiment provided in the present application, the control signal output module includes a second capacitor, a first end of the second capacitor is used to receive a frame synchronization signal, and a second end of the second capacitor is connected to a control end of the locking signal acquisition module.

[0013] In one embodiment provided in the present application, the locking signal acquisition module includes a third switch tube, the control end of the third switch tube is used to receive the first control signal, the first end of the third switch tube is used to receive the locking signal, and the second end of the third switch tube is connected to the first node.

[0014] In one embodiment provided by the present application, the detection device provided by the present application further includes a reset module, the control end of the reset module is used to receive a reset signal, and the reset module is used to control whether the input end of the control signal output module is grounded according to the reset signal.

[0015] In one embodiment provided in the present application, the detection device provided in the present application further includes a timing control module, which is used to control the sending time of the reset signal, the frame synchronization signal, the lock signal and the power input signal.

[0016] In one embodiment provided in the present application, the timing control module is configured to trigger an adjustment signal to restore the locking signal to a locked state when the locking signal is less than or equal to a preset voltage.

[0017] In one embodiment provided by the present application, the detection device provided by the present application also includes an anti-backlash module, the first end of the anti-backlash module is used to receive a frame synchronization signal, the second end of the anti-backlash module is connected to the input end of the control signal output module, and the first end of the anti-backlash module to the second end of the anti-backlash module are unidirectionally conductive.

[0018] In the technical solution of the present application, a lock signal detection device includes: a control signal output module for outputting a first control signal upon receiving a frame synchronization signal; a lock signal acquisition module, wherein the input end of the lock signal acquisition module is used to receive the lock signal, the control end of the lock signal acquisition module is used to receive the first control signal, and the lock signal acquisition module is used to transmit the lock signal to a first node upon receiving the first control signal; a voltage comparison module, wherein the first input end of the voltage comparison module is connected to the first node, and the second input end of the voltage comparison module is used to receive a preset voltage; the voltage comparison module is used to output a lock signal detection result based on the lock signal and the preset voltage, the detection result being used to indicate whether the lock signal is in an unlocked state. The control signal output module in the present application outputs the first control signal upon receiving the frame synchronization signal; and the control end of the lock signal acquisition module transmits the lock signal to the first node upon receiving the first control signal. Thus, before each frame is displayed, the lock signal is detected by the voltage comparison module, and whether the lock signal is unlocked can be quickly determined, thereby improving the working efficiency of the detection display device. In addition, the present application has a simple structure, low cost, and is convenient for later maintenance and updating.

[0019] It should be understood that the above general description and the following detailed description are merely exemplary and explanatory and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0021] Figure 1 The following schematically shows a structural diagram of a lock signal detection device provided in an embodiment of the present application.

[0022] Figure 2 The schematic diagram shows the structure of the power control module in an embodiment provided by the present application.

[0023] Figure 3 The schematic diagram shows the structure of the voltage comparison module in an embodiment provided by the present application.

[0024] Figure 4 The schematic diagram shows the structure of the control signal output module in one embodiment provided by the present application.

[0025] Figure 5 The schematic diagram shows the structure of the locking signal acquisition module in an embodiment provided by the present application.

[0026] Figure 6 The schematic diagram shows the structure of the reset module in an embodiment provided by the present application.

[0027] Figure 7 The timing diagram of the reset signal, frame synchronization signal, lock signal and power input signal in the present application is schematically shown.

[0028] Description of reference numerals:

[0029] 110. Control signal output module; 120. Lock signal acquisition module; 130. Voltage comparison module. DETAILED DESCRIPTION

[0030] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art.

[0031] Figure 1 The following schematically shows a structural diagram of a lock signal detection device provided in an embodiment of the present application.

[0032] like Figure 1 As shown, the present application provides a lock signal detection device, which specifically includes: a control signal output module 110 , a lock signal acquisition module 120 and a voltage comparison module 130 .

[0033] The control signal output module 110 is used to output a first control signal when receiving a frame synchronization signal, wherein the frame synchronization signal is a vertical displacement start pulse signal of the gate drive circuit, which is used to indicate the beginning of a new frame of the picture. The frame synchronization signal can be a positive pulse or a negative pulse, which can be set according to actual conditions. Generally, the frame synchronization signal is a positive pulse.

[0034] The locking signal acquisition module 120 has an input end for receiving a locking signal, a control end for receiving a first control signal, and the locking signal acquisition module 120 is configured to transmit the locking signal to the first node upon receiving the first control signal.

[0035] Specifically, the lock signal is a signal that the source driver module feeds back to the timing control chip (or system-on-chip) to indicate the current state of the source driver module. During normal display, the lock signal is normally high. If the phase-locked loop (PLL) that locks the signal is unlocked, the lock signal is low, and the display module will not display normally.

[0036] For example, when the control signal output module 110 receives the frame synchronization signal, it outputs a high-level first control signal to the control terminal of the lock signal acquisition module 120, which then transmits the lock signal to the first node. It should be understood that the lock signal acquisition module 120 can also be triggered to transmit the lock signal to the first node when the first control signal is at a low level, and accordingly, the frame synchronization signal is also a negative pulse.

[0037] A voltage comparison module 130, wherein a first input terminal of the voltage comparison module 130 is connected to a first node, and a second input terminal of the voltage comparison module 130 is used to receive a preset voltage; the voltage comparison module 130 is used to output a detection result of a locking signal based on the locking signal and the preset voltage, and the detection result is used to indicate whether the locking signal is in an unlocked state.

[0038] Specifically, the preset voltage is used to compare with the locking signal, and the comparison result obtained is the detection result, which is used to indicate whether the locking signal is in an unlocked state. Since the locking signal is generally at a high level when normal and at a low level when in an unlocked state, the preset voltage can be set according to the voltage range when the locking signal is in a normal state. After the voltage comparison module 130 receives the locking signal from the first node, it compares the locking signal with the preset voltage. For example, when the locking signal is greater than the preset voltage, the voltage comparison module 130 outputs a low level; when the locking signal is less than or equal to the preset voltage, the voltage comparison module 130 outputs a high level. The detection result output by the voltage comparison module 130 at a high level or a low level can reflect the size relationship between the locking signal and the preset voltage, thereby determining whether the locking signal is in a normal state or an unlocked state.

[0039] In the technical solution of the present application, a lock signal detection device includes: a control signal output module for outputting a first control signal upon receiving a frame synchronization signal; a lock signal acquisition module, wherein the input end of the lock signal acquisition module is used to receive the lock signal, the control end of the lock signal acquisition module is used to receive the first control signal, and the lock signal acquisition module is used to transmit the lock signal to a first node upon receiving the first control signal; a voltage comparison module, wherein the first input end of the voltage comparison module is connected to the first node, and the second input end of the voltage comparison module is used to receive a preset voltage; the voltage comparison module is used to output a lock signal detection result based on the lock signal and the preset voltage, the detection result being used to indicate whether the lock signal is in an unlocked state. By the control signal output module in the present application outputting the first control signal upon receiving the frame synchronization signal; and the control end of the lock signal acquisition module transmitting the lock signal to the first node upon receiving the first control signal, the lock signal is detected by the voltage comparison module before each frame is displayed, and it is possible to quickly determine whether the lock signal is unlocked, thereby improving the working efficiency of the detection display device. In addition, the present application has a simple structure, low cost, and is conducive to later maintenance and updating.

[0040] In one embodiment provided in the present application, the detection device provided in the present application also includes a power control module, the first end of the power control module is connected to the input end of the power input signal of the display device, the control end of the power control module is used to receive the detection result, and the power control module is used to control the power input signal to input the display device or ground according to the detection result.

[0041] Specifically, the power input signal of the display device is used to control whether the display device is in an on or off state. For example, when the power input signal of the display device is at a high level and input to the display device, the display device is in an on state; when the power input signal is at a high level but the power input signal is not input to the display device but is grounded, or when the power input signal is at a low level, the display device is in an off state. The power input signal is controlled to be input to the display device or to be grounded based on the detection result. The power input signal can be input to the display device when the detection result is at a low level and to be grounded when the detection result is at a high level; or the power input signal can be grounded when the detection result is at a low level and to be input to the display device when the detection result is at a high level.

[0042] Through this embodiment, the present application can input the power input signal into the display device when the locking signal is normal, so that the display device is in the power-on state. When the locking signal is in the unlocked state, the power control module in the present application grounds the power input signal to put the display device in the power-off state, thereby prompting that there is a problem with the locking signal of the display device and preventing the abnormal locking signal from damaging the display device.

[0043] Figure 2 The schematic diagram shows the structure of the power control module in an embodiment provided by the present application.

[0044] In one embodiment provided in this application, Figure 2 As shown, the power control module includes a first switch tube T1, a first end of the first switch tube T1 is connected to the input end U of the power input signal of the display device 设 The control terminal of the first switch tube is used to receive the detection result V 检 , the second end of the first switch tube is grounded.

[0045] For example, when the control terminal of the first switch tube T1 receives the detection result V 检 When the first switch tube T1 is turned on, the input terminal U of the power input signal of the display device is 设 Grounded, no power input signal is input to the display device, the display device will be in the shutdown state; when the control end of the first switch tube T1 receives the detection result V 检 When the first switch tube T1 is turned off, the input terminal U of the power input signal of the display device is 设 When the power input signal Vin is received normally, the display device will be in the power-on state.

[0046] Figure 3 The schematic diagram shows the structure of the voltage comparison module in an embodiment provided by the present application.

[0047] In one embodiment provided in this application, Figure 3 As shown, the voltage comparison module includes a second switch tube T2, a first capacitor C1 and a comparator U1; the control end of the second switch tube T2 is connected to the input end N of the control signal output module, the first end of the second switch tube T2 is connected to the first node M, the second end of the second switch tube T2 is connected to the first end of the first capacitor C1, and the second end of the first capacitor C1 is connected to the first end of the comparator U1; the second end of the comparator U1 is used to receive a preset voltage Ver, the power end of the comparator U1 is connected to the output end of the power input signal, and the output end of the comparator U1 is used to output a detection result V 检 .

[0048] Specifically, assuming that when the frame synchronization signal is at a high level, the voltage V1 of the input terminal N of the control signal output module is at a high level, the second switch tube T2 is turned on, and the first terminal of the second switch tube T2 is connected to the first node M, that is, when the second switch tube T2 is turned on, the locking signal passes through the first terminal of the second switch tube T2, the second terminal of the second switch tube T2, the first terminal of the first capacitor C1, and the second terminal of the first capacitor C1 in sequence, and is transmitted to the first terminal of the comparator U1. Then, the comparator U1 compares the locking signal with the preset voltage Ver to obtain a detection result V检 . When the frame synchronization signal is at a low level, the voltage V1 of the input terminal N of the control signal output module is at a low level. At this time, the second switch tube T2 is turned off, and the comparator U1 will not be triggered to compare the lock signal with the preset voltage. In addition, the present application maintains the voltage of the first end of the comparator U1 through the first capacitor C1 to prevent the voltage of the first end of the comparator U1 from suddenly changing, which may cause the comparator U1 to misjudge. In addition, the output end of the power input signal refers to the output end of the module that generates the power input signal, and the power end of the comparator U1 is connected to the output end of the power input signal, so that the power input signal is used as the working voltage of the comparator U1, so that the comparator U1 is in a working state.

[0049] Figure 4 The schematic diagram shows the structure of the control signal output module in one embodiment provided by the present application.

[0050] In one embodiment provided in this application, Figure 4 As shown, the control signal output module 110 includes a second capacitor C2, a first end of the second capacitor C2 is used to receive the frame synchronization signal STV, and a second end of the second capacitor C2 is connected to the control end U of the lock signal acquisition module. 控 .

[0051] Specifically, when the control signal output module receives the frame synchronization signal STV, the second capacitor C2 starts to charge and outputs a first control signal at the second end of the second capacitor C2. The first control signal is transmitted to the control terminal U1 of the lock signal acquisition module. 控 It should be understood that the control signal output module receiving the frame synchronization signal in this application means that the control signal output module receives the frame synchronization signal that meets the preset voltage threshold, and then the control signal output module can output the first control signal. Through this embodiment, each time the frame synchronization signal is received, the control signal output module can output the first control signal accordingly, thereby controlling the locking signal acquisition module to transmit the locking signal to the first node.

[0052] In one embodiment provided in this application, Figure 4As shown, the detection device provided by the present application also includes an anti-reverse module D1, the first end of the anti-reverse module D1 is used to receive the frame synchronization signal STV, the second end of the anti-reverse module D1 is connected to the input end N of the control signal output module, and the first end of the anti-reverse module D1 to the second end of the anti-reverse module D1 is unidirectional. After the first end of the anti-reverse module D1 receives the frame synchronization signal, the frame synchronization signal is transmitted to the input end N of the control signal output module through the anti-reverse module D1. The frame synchronization signal STV is a pulse marking the beginning of a new frame of the picture. Then, after the pulse duration of the frame synchronization signal ends, the anti-reverse module prevents the voltage of the control signal output module from being reversely input into the output end or other components of the frame synchronization signal, thereby improving the reliability of the detection device provided by the present application.

[0053] Figure 5 The schematic diagram shows the structure of the locking signal acquisition module in an embodiment provided by the present application.

[0054] In one embodiment provided in the present application, the lock signal acquisition module 120 includes a third switch tube T3, the control end of the third switch tube T3 is used to receive the first control signal U 控 The first end of the third switch tube T3 is used to receive the lock signal lock, and the second end of the third switch tube T3 is connected to the first node M.

[0055] Specifically, assuming that the first control signal U 控 When the first control signal U is high, the third switch tube T3 is turned on, thereby transmitting the lock signal lock from the first end of the third switch tube T3 to the first node M; 控 When the third switch tube T3 is at a low level, the third switch tube T3 is turned off. At this time, the lock signal lock cannot be transmitted from the first end of the third switch tube T3 to the first node M. It should be understood that if the first control signal U 控 When the first control signal U is high, the lock signal acquisition module is triggered to transmit the lock signal lock to the first node. 控 When it is at a low level, it means that the control signal output module has not received the frame synchronization signal, and the voltage comparison module will not be triggered to compare the lock signal with the preset voltage. As a result, the application starts to detect the lock signal only after receiving the frame synchronization signal before each frame is displayed, instead of blindly detecting the lock signal and causing the display device to frequently turn on and off.

[0056] In one embodiment provided in the present application, the detection device provided in the present application further includes a reset module, the control end of the reset module is used to receive a reset signal, and the reset module is used to control whether the input end of the control signal output module is grounded according to the reset signal.

[0057] Specifically, before detecting the lock signal of each frame, the voltage of the control signal output module is reset to zero through a reset signal to prevent residual charge in the control signal output module from affecting the voltage of the first control signal.

[0058] Figure 6 The schematic diagram shows the structure of the reset module in an embodiment provided by the present application.

[0059] For example, the reset module includes a fourth switch tube T4, the control end of the fourth switch tube T4 is used to receive the reset signal RST, the first end of the fourth switch tube T4 is connected to the input end N of the control signal output module, and the second end of the fourth switch tube T4 is grounded. Figure 4 In the structure shown, the first end of the fourth switch T4 is connected to the first end of the second capacitor C2. Before each frame synchronization signal is issued, a reset signal is sent to the reset module to turn on the fourth switch T4, thereby grounding the first end of the second capacitor C2, releasing residual charge in the second capacitor C2 and reducing errors in the detection device. It should be understood that the duration of the reset signal and the duration of the frame synchronization signal do not overlap or intersect.

[0060] In one embodiment provided in the present application, the detection device provided in the present application further includes a timing control module, which is used to control the sending time of the reset signal, the frame synchronization signal, the lock signal and the power input signal.

[0061] Figure 7 The timing diagram of the reset signal, frame synchronization signal, lock signal and power input signal in the present application is schematically shown. Specifically, the timing control module is used to control the sending time of the reset signal RST, the frame synchronization signal STV, the lock signal lock and the power input signal Vin, so that the present application can detect the lock signal before the start of each frame, and reset the residual voltage of the control signal output module to zero before detecting the lock signal. It should be understood that Figure 7 The timing diagram for the reset signal, frame synchronization signal, lock signal, and power input signal is just one example. For example, after the power input signal Vin is pulled high from a low level, it is also possible to pull it back down to a low level. Similarly, after the lock signal Lock is pulled high from a low level, it will be pulled down to a low level due to the phase-locked loop losing lock. After adjustment, the lock signal Lock can also be restored to a high level.

[0062] In one embodiment provided in the present application, the timing control module is configured to trigger an adjustment signal to restore the locking signal to a locked state when the locking signal is less than or equal to a preset voltage.

[0063] Specifically, assuming the lock signal is high when in the locked state and low when in the unlocked state, when the lock signal is less than or equal to a preset voltage, the timing control module triggers an adjustment signal to the source driver module of the display device to retrain the lock signal until the lock signal returns to a high level. At this point, the timing control module sends display data normally, the source driver module outputs data normally, and the display device can display normally.

[0064] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of this application and include common knowledge or customary techniques in the art that are not disclosed herein.

[0065] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A locking signal detection device, characterized in that: include: A control signal output module, configured to output a first control signal when receiving a frame synchronization signal; a locking signal acquisition module, wherein an input end of the locking signal acquisition module is used to receive a locking signal, a control end of the locking signal acquisition module is used to receive the first control signal, and the locking signal acquisition module is used to transmit the locking signal to the first node upon receiving the first control signal; A voltage comparison module includes a second switching tube, a first capacitor, and a comparator, wherein the control end of the second switching tube is connected to the input end of the control signal output module, the first end of the second switching tube is connected to the first node to receive the locking signal, the second end of the second switching tube is connected to the first end of the first capacitor, and the second end of the first capacitor is connected to the first end of the comparator; the second end of the comparator is used to receive a preset voltage, the power end of the comparator is connected to the output end of the power input signal, and the output end of the comparator is used to output a detection result of the locking signal based on the locking signal and the preset voltage, wherein the detection result is used to indicate whether the locking signal is in an unlocked state.

2. The lock signal detection device according to claim 1, wherein: The detection device also includes a power control module, a first end of the power control module is connected to the input end of the power input signal of the display device, a control end of the power control module is used to receive the detection result, and the power control module is used to control the power input signal to be input into the display device or to be grounded according to the detection result.

3. The lock signal detection device according to claim 2, wherein: The power control module includes a first switch tube, a first end of the first switch tube is connected to the input end of the power input signal of the display device, a control end of the first switch tube is used to receive the detection result, and a second end of the first switch tube is grounded.

4. The lock signal detection device according to claim 1, wherein: The control signal output module includes a second capacitor, a first end of the second capacitor is used to receive the frame synchronization signal, and a second end of the second capacitor is connected to the control end of the lock signal acquisition module.

5. The lock signal detection device according to claim 1, wherein: The locking signal acquisition module includes a third switch tube, a control end of the third switch tube is used to receive the first control signal, a first end of the third switch tube is used to receive the locking signal, and a second end of the third switch tube is connected to the first node.

6. The lock signal detection device according to claim 1, wherein: The detection device further includes a reset module, a control end of the reset module is used to receive a reset signal, and the reset module is used to control whether the input end of the control signal output module is grounded according to the reset signal.

7. The lock signal detection device according to claim 1, wherein: The detection device further includes a timing control module, which is used to control the sending time of the reset signal, the frame synchronization signal, the lock signal and the power input signal.

8. The lock signal detection device according to claim 7, wherein: The timing control module is configured to trigger an adjustment signal to restore the locking signal to a locked state when the locking signal is less than or equal to the preset voltage.

9. The lock signal detection device according to claim 1, wherein: The detection device also includes an anti-backlash module, a first end of the anti-backlash module is used to receive the frame synchronization signal, a second end of the anti-backlash module is connected to the input end of the control signal output module, and the first end of the anti-backlash module is unidirectionally conductive to the second end of the anti-backlash module.

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