Patent Publication Number: US-10332459-B2

Title: Display device and a driving method

Description:
The present application is the U.S. national phase entry of PCT/CN2016/073995, with an international filing date of Feb. 18, 2016, which claims the benefit of Chinese Patent Application No. 20151058110.4, filed on Sep. 2, 2015, the entire disclosure of which is incorporated herein by reference. 
     TECHNICAL FIELD 
     The present application relates to the field of display technology, particularly to a display device and a driving method. 
     BACKGROUND 
     At present, in liquid crystal display products, the main board control terminal is provided with a general antistatic mechanism. Generally, the main board control unit will send a read command to the source drive chip of the liquid crystal display module at intervals, so as to read the characterization value of the electrostatic status register of the source drive chip, i.e., the state value of the 0A register, thereby determining whether a reset signal will be sent to reset the source drive chip. 
     Generally, when the source drive chip has electrostatic abnormity, it has to be reset; the reset process thereof is as shown in  FIG. 1 . Take the 0A register as an example, the process specifically includes: S 10 , reading the state value of the 0A register of the source drive chip by the control unit at every fixed time interval; S 11 , not inputting a reset signal to the source drive chip, and not resetting the source drive chip when the value of 09 characterizing normal operation of the source drive chip is read; S 12 , inputting a reset signal to the source drive chip, and controlling the source drive chip to be reset when the value characterizing abnormal operation of the source drive chip, i.e., the value of not 09 characterizing electrostatic abnormity of the source drive chip, is read. However, sometimes the source drive chip with electrostatic abnormity cannot be reset under the control of the reset signal; thus, the electrostatic detection mechanism will fail, thereby influencing normal operation of the liquid crystal display module. 
     Therefore, a problem to be solved by the skilled person in the art urgently is that, how to ensure reset of the source drive chip under the control of the reset signal and improve the situation of failure of reset of the source drive chip in case of electrostatic abnormity, thereby enhancing antistatic ability of the liquid crystal display module. 
     SUMMARY 
     Embodiments of the present application provide a display device and a driving method, for ensuring reset of the source drive chip under the control of the reset signal and improving the situation of failure of reset of the source drive chip in case of electrostatic abnormity, thereby enhancing antistatic ability of the liquid crystal display module. 
     One aspect of the present application provides a display device, comprising: a power reset circuit and a source drive chip for driving a display panel to display. 
     An input terminal of the power reset circuit is connected with a power signal output terminal, a control terminal of the power reset circuit is connected with a reset signal terminal, and an output terminal of the power reset circuit is connected with a power signal input terminal of the source drive chip. 
     The power reset circuit is used for resetting a power signal synchronously when receiving a reset signal, and inputting the reset power signal into the power signal input terminal of the source drive chip. 
     In one embodiment, the power reset circuit comprises: a first switch transistor, a second switch transistor, a first resistor and a second resistor. 
     A gate of the first switch transistor is connected with the reset signal output terminal, a source of the first switch transistor is connected with one terminal of the first resistor and a gate of the second switch transistor respectively, and a drain of the first switch transistor is connected with a ground level signal terminal. 
     The other terminal of the first resistor is connected with the power signal output terminal and a source of the second switch transistor respectively. 
     A drain of the second switch transistor is connected with one terminal of the second resistor and the power signal input terminal of the power driver chip respectively. 
     The other terminal of the second resistor is connected with the ground level signal terminal. 
     In one embodiment, the source drive chip comprises a status register. 
     The status register is used for outputting a first characterization value characterizing that the source drive chip is in an abnormal operating state when the source drive chip has electrostatic abnormity, and outputting a second characterization value characterizing that the source drive chip is in a normal operating state when the source drive chip operates normally. 
     In one embodiment, the display device further comprises a control unit. 
     The control unit is used for reading characterization values of the status register at every preset time interval; 
     inputting a reset signal to the control terminal of the power reset circuit when reading the first characterization value, and not inputting the reset signal to the control terminal of the power reset circuit when reading the second characterization value. 
     In one embodiment, the control unit is further used for inputting the reset signal to the reset terminal of the source drive chip when reading the first characterization value. 
     In one embodiment, the power reset circuit and the control unit are arranged on a flexible circuit board. 
     The other aspect of the present application provides a power signal reset driving method for use in a display device provided by embodiments of the present application, comprising: 
     when receiving a reset signal, the power reset circuit resetting a power signal synchronously, and inputting the reset power signal into the power signal input terminal of the source drive chip. 
     In one embodiment, the power signal reset driving method further comprises: 
     reading characterization values characterizing the operating states of the source drive chip at every preset time interval; 
     inputting the reset signal to the control terminal of the power reset circuit after it is determined that the source drive chip has electrostatic abnormity. 
     In one embodiment, in the power signal reset driving method, reading characterization values characterizing the operating states of the source drive chip comprises: 
     reading a first characterization value characterizing that the source drive chip is in an abnormal operating state when the source drive chip has electrostatic abnormity, and reading a second characterization value characterizing that the source drive chip is in a normal operating state when the source drive chip operates normally. 
     In one embodiment, in the power signal reset driving method, inputting the reset signal to the control terminal of the power reset circuit after it is determined that the source drive chip has electrostatic abnormity comprises: 
     inputting the reset signal to the control terminal of the power reset circuit when reading the first characterization value, and not inputting the reset signal to the control terminal of the power reset circuit when reading the second characterization value. 
     In one embodiment, the power signal reset driving method further comprises: inputting the reset signal to the reset terminal of the source drive chip when reading the first characterization value. 
     Embodiments of the present application provide a display device and a driving method. The display device comprises: a power reset circuit and a source drive chip for driving a display panel to display. An input terminal of the power reset circuit is connected with a power signal output terminal, a control terminal of the power reset circuit is connected with a reset signal terminal, an output terminal of the power reset circuit is connected with a power signal input terminal of the source drive chip. The power reset circuit is used for resetting a power signal synchronously when receiving a reset signal, and inputting the reset power signal into the power signal input terminal of the source drive chip. By adding a power reset circuit in the display device, when the source drive chip has electrostatic abnormity, the power signal can be reset synchronously and the reset power signal can be inputted to the power signal input terminal of the source drive chip, so as to initialize the source drive chip, drive the source drive chip again, ensure that the source drive chip can be reset in case of electrostatic abnormity, and improve the situation of failure of reset of the source drive chip in case of electrostatic abnormity, thereby enhancing antistatic ability of the liquid crystal display module. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a flow chart of a reset driving method when the source drive chip has electrostatic abnormity in the prior art; 
         FIG. 2  is a structural schematic view of a display device provided by embodiments of the present application; 
         FIG. 3  is a specific structural schematic view of a display device provided by embodiments of the present application; 
         FIG. 4  is a flow chart of a driving method of performing synchronous reset of the source drive chip and the power signal by a display device provided by embodiments of the present application. 
     
    
    
     DETAILED DESCRIPTION 
     Next, the specific implementation of the display device and the driving method provided by embodiments of the present application will be explained in detail with reference to the drawings. 
     Embodiments of the present invention provides a display device, as shown in  FIG. 2 . The display device can comprise: a power reset circuit  01  and a source drive chip  02  for driving a display panel to display. 
     An input terminal of the power reset circuit  01  is connected with a power signal output terminal Vout, a control terminal of the power reset circuit  01  is connected with a reset signal terminal Reset, and an output terminal of the power reset circuit  01  is connected with a power signal input terminal of the source drive chip. 
     The power reset circuit  01  is used for resetting a power signal synchronously when receiving a reset signal, and inputting the reset power signal into the power signal input terminal of the source drive chip  02 . 
     The above display device provided by embodiments of the present application comprises: a power reset circuit  01  and a source drive chip  02  for driving a display panel to display. An input terminal of the power reset circuit  01  is connected with a power signal output terminal Vout, a control terminal of the power reset circuit  01  is connected with a reset signal terminal Reset, and an output terminal of the power reset circuit  01  is connected with a power signal input terminal of the source drive chip  02 . The power reset circuit  01  is used for resetting a power signal synchronously when receiving a reset signal, and inputting the reset power signal into the power signal input terminal of the source drive chip  02 . By adding a power reset circuit in the display device, when the source drive chip has electrostatic abnormity, the power signal can be reset synchronously and the reset power signal can be inputted to the power signal input terminal of the source drive chip, so as to initialize the source drive chip, drive the source drive chip again, ensure that the source drive chip can be reset in case of electrostatic abnormity, and improve the situation of failure of reset of the source drive chip in case of electrostatic abnormity, thereby enhancing antistatic ability of the liquid crystal display module. 
     As shown in  FIG. 3 , the power reset circuit  01  can comprise: a first switch transistor T 1 , a second switch transistor T 2 , a first resistor R 1  and a second resistor R 2 . A gate of the first switch transistor T 1  is connected with the reset signal output terminal Reset, a source of the first switch transistor T 1  is connected with one terminal of the first resistor R 1  and a gate of the second switch transistor T 2  respectively, and a drain of the first switch transistor T 1  is connected with a ground level signal terminal GND. The other terminal of the first resistor R 1  is connected with the power signal output terminal Vout and a source of the second switch transistor T 2  respectively. A drain of the second switch transistor T 2  is connected with one terminal of the second resistor R 2  and the power signal input terminal of the power driver chip  02  respectively. The other terminal of the second resistor R 2  is connected with the ground level signal terminal GND. 
     When the display device operates normally, the reset signal terminal Reset outputs a high level, and the power signal output terminal Vout outputs a high level signal, here the first switch transistor T 1  is turned on. The first switch transistor T 1  that has been turned on conducts the gate of the second switch transistor T 2  with the ground level signal terminal GND; hence, the gate of the second switch transistor T 2  is a low level signal. The second switch transistor T 2  is a P-type transistor; hence, the second switch transistor T 2  is turned on. The second switch transistor T 2  that has been turned on transmits the high level signal outputted by the power signal output terminal Vout to the power signal input terminal of the source drive chip  02 , such that the source drive chip can operate normally. When the reset signal terminal Reset outputs a low level signal, the first switch transistor T 1  is cut off. The gate of the second switch transistor T 2  is a high level signal; hence, the second switch transistor T 2  is also cut off. Here, the signal inputted to the power signal input terminal of the source drive chip is a low level signal; hence, the source drive chip is reset. After the source drive chip is reset, the reset signal terminal Reset outputs the high level signal again, and the signal inputted to the power signal input terminal of the source drive chip is recovered as a high level signal; thus the act of reseting the power signal through the signal of the reset signal terminal Reset is accomplished, such that when the source drive chip has electrostatic abnormity, the power signal can be reset synchronously, so as to ensure that the source drive chip can be reset when having electrostatic abnormity. 
     It should be noted that the switch transistors mentioned in the above embodiments of the present application can be thin film transistors (TFT), and can also be metal oxide semiconductor (MOS) transistors, which will not be defined here. In specific implementation, the sources and the drains of these transistors can be interchanged, which will not be differentiated specifically. When specific embodiments are described, for example, the transistors are thin film transistors. 
     The source drive chip can comprise a status register. The status register is used for outputting a first characterization value characterizing that the source drive chip is in an abnormal operating state when the source drive chip has electrostatic abnormity, and outputting a second characterization value characterizing that the source drive chip is in a normal operating state when the source drive chip operates normally. Specifically, the operating state of the source drive chip can be characterized by the status register. Take the 0A register as an example, when the source drive chip has electrostatic abnormity, the 0A register can output a characterization value 09 characterizing that the source drive chip has electrostatic abnormity, thereby facilitating the control unit of the display device to read the operating state of the source drive chip. When the source drive chip has electrostatic abnormity, a reset signal is outputted to control the source drive chip to be reset. Meanwhile, the power reset circuit resets the power signal synchronously under the control of the reset signal, so as to ensure that the source drive chip can be reset when having electrostatic abnormity, and improve the situation of failure of reset of the source drive chip when having electrostatic abnormity. In addition, the electrostatic abnormity status register comprised by the source drive chip can be a 0A register and can also be registers of other types, which will not be defined here. 
     The display device can further comprise a control unit. The control unit is used for reading characterization values of the status register at every preset time interval. A reset signal is inputted to the control terminal of the power reset circuit when reading the first characterization value, and the reset signal is not inputted to the control terminal of the power reset circuit when reading the second characterization value. Specifically, the control unit reads characterization values of the status register at every preset time interval, and inputs a reset signal to the power reset circuit when it is determined that the source drive chip has electrostatic abnormity, so as to reset the power signal synchronously and ensure that the source drive chip can be reset when having electrostatic abnormity. 
     The control unit is further used for inputting the reset signal to the reset terminal of the source drive chip when reading the first characterization value. Specifically, the control unit outputs a reset signal synchronously to the source drive chip and the power reset circuit when the source drive chip has electrostatic abnormity, so as to control the source drive chip to be reset. Meanwhile, in order to improve the situation of failure of reset of the source drive chip when having electrostatic abnormity, the power signal is reset synchronously through the power reset circuit under the control of the reset signal, so as to ensure that the source drive chip can be reset when having electrostatic abnormity, thereby enhancing antistatic ability of the display device. 
     The power reset circuit and the control unit can be arranged on a flexible circuit board. Specifically, the power reset circuit and the control unit are arranged on a flexible circuit board, so as to be bond with the display panel synchronously. When the source drive chip has electrostatic abnormity, a reset signal controls the source drive chip and the power reset circuit to realize synchronous reset of the source drive chip and the power signal, so as to ensure that the source drive chip can be reset when having electrostatic abnormity, and improve the situation of failure of reset of the source drive chip when having electrostatic abnormity, thereby enhancing the antistatic ability of the display device. 
     Based on the same inventive concept, embodiments of the present application provide a power signal reset driving method for use in a display device as stated above, which can comprise: when receiving a reset signal, the power reset circuit resetting a power signal synchronously, and inputting the reset power signal into the power signal input terminal of the source drive chip. Specifically, when the source drive chip has electrostatic abnormity, the power reset circuit is controlled through a control signal, so as to realize synchronous reset of the power signal, and input the reset power signal to the power signal input terminal of the source drive chip. In this way, when the source drive chip is reset, the power signal can be reset synchronously, so as to initialize the source drive chip, reset the source drive chip, ensure that the source drive chip can be reset in case of electrostatic abnormity, and improve the situation of failure of reset of the source drive chip in case of electrostatic abnormity, thereby enhancing antistatic ability of the liquid crystal display module. 
     The power signal reset driving method can further comprise: reading characterization values characterizing the operating states of the source drive chip at every preset time interval; inputting the reset signal to the control terminal of the power reset circuit after it is determined that the source drive chip has electrostatic abnormity. Specifically, in the power signal reset driving method, the characterization values characterizing the operating states of the source drive chip are read at every preset time interval, so as to input a reset signal to the control terminal of the power reset circuit when the source drive chip has electrostatic abnormity, realize synchronous reset of the power signal, and ensure that the source drive chip can be reset when having electrostatic abnormity. 
     In specific implementation, in the power signal reset driving method, reading characterization values characterizing the operating states of the source drive chip can comprise: reading a first characterization value characterizing that the source drive chip is in an abnormal operating state when the source drive chip has electrostatic abnormity, and reading a second characterization value characterizing that the source drive chip is in a normal operating state when the source drive chip operates normally. Specifically, the operating state of the source drive chip can be characterized by the status register, and the control unit reads characterization values characterizing the operating states of the source drive chip at every preset time interval. When the first characterization value characterizing that the source drive chip is in an abnormal operating state is read, it is determined that the source drive chip has electrostatic abnormity, thereby outputting a reset signal to the control terminal of the power reset circuit. The power reset circuit resets the power signal under the control of the reset signal, and inputs the reset power signal to the power signal input terminal of the source drive chip, so as to control the source drive chip to be reset. In this way, when the source drive chip has electrostatic abnormity, it ensures that the source drive chip can be reset, improves the situation of failure of reset of the source drive chip when having electrostatic abnormity, thereby enhancing the antistatic ability of the liquid crystal display module. 
     In specific implementation, in the power signal reset driving method, inputting the reset signal to the control terminal of the power reset circuit after it is determined that the source drive chip has electrostatic abnormity can comprise: inputting the reset signal to the control terminal of the power reset circuit when reading the first characterization value, and not inputting the reset signal to the control terminal of the power reset circuit when reading the second characterization value. Specifically, the control unit reads characterization values outputted by the status register at every preset time interval, and outputs a reset signal to the power reset circuit when the source drive chip has electrostatic abnormity, i.e., when reading the first characterization value, so as to control the power reset circuit to reset the power signal synchronously and ensure reset of the source drive chip. 
     In specific implementation, the power signal reset driving method can further comprise: inputting the reset signal to the reset terminal of the source drive chip when reading the first characterization value. Specifically, the control unit outputs a reset signal to the source drive chip and the power reset circuit synchronously when the source drive chip has electrostatic abnormity, so as to control reset of the source drive chip. Meanwhile, in order to improve the situation of failure of reset of the source drive chip when having electrostatic abnormity, the power signal is reset synchronously through the power reset circuit under the control of the reset signal, so as to ensure that the source drive chip can be reset when having electrostatic abnormity, thereby enhancing antistatic ability of the display device. 
     Next, the specific process of performing synchronous reset of the source drive chip and the power signal by the display device provided by embodiments of the present invention will be explained in detail with a specific embodiment, the specific process is as shown in  FIG. 4 : 
     S 101 , reading characterization values of the status register at every preset time interval, take the 0A register as an example, if the characterization value is 09, it indicates that the source drive chip is in a normal operating state; if the characterization value is not 09, it indicates that the source drive chip is in an abnormal operating state, i.e., the source drive chip has electrostatic abnormity. 
     S 102 , outputting a reset signal to the source drive chip and the power reset circuit if the characterization value of the status register is not 09; not outputting a reset signal to the source drive chip and the power reset circuit if the characterization value of the status register is 09. 
     S 103 , resetting the source drive chip and the power signal synchronously when the source drive chip and the power reset circuit receive the reset signal. 
     Embodiments of the present application provide a display device and a driving method. The display device comprises: a power reset circuit and a source drive chip for driving a display panel to display. An input terminal of the power reset circuit is connected with a power signal output terminal, a control terminal of the power reset circuit is connected with a reset signal terminal, an output terminal of the power reset circuit is connected with a power signal input terminal of the source drive chip. The power reset circuit is used for resetting a power signal synchronously when receiving a reset signal, and inputting the reset power signal into the power signal input terminal of the source drive chip. By adding a power reset circuit in the display device, when the source drive chip has electrostatic abnormity, the power signal is reset synchronously and the reset power signal is inputted to the power signal input terminal of the source drive chip, so as to initialize the source drive chip, drive the source drive chip again, ensure that the source drive chip can be reset in case of electrostatic abnormity, and improve the situation of failure of reset of the source drive chip in case of electrostatic abnormity, thereby enhancing antistatic ability of the liquid crystal display module. 
     Apparently, the skilled person in the art can make various amendments and modifications to the present application without departing from the spirit and the scope of the present application. In this way, provided that these amendments and modifications of the present invention belong to the scopes of the claims of the present application and the equivalent technologies thereof, the present application also intends to encompass these amendments and modifications.