Liquid crystal display disconnection detection circuit and detection method
A liquid crystal display and disconnection detection technology, which is applied to static indicators, instruments, etc., can solve the problem that the detection circuit cannot detect disconnection, and achieve the effect of improving product quality and reducing the leakage rate of disconnection
Active Publication Date: 2016-08-03
TCL CHINA STAR OPTOELECTRONICS TECH CO LTD
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[0007] The main purpose of the present invention is to propose a detection circuit and a detection method capable of detecting disconnection in view of the defect that the liquid crystal display in the prior art cannot detect disconnection by using a bidirectionally driven detection circuit
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[0031]For a generally large-sized screen, the gate signal line is longer and the voltage required to turn on the first transistor is higher (usually 27V or 33V), and the resistance and capacitance delay effect is obvious; the length of the data signal line is shorter and the voltage is lower (generally 27V or 33V). It is 0 to 14V), and the resistance and capacitance delay effects have little influence. Generally, the gate bidirectional and data unidirectional drive circuits are used. However, for a large-sized screen, the required data signal line is relatively long, so a gate bidirectional and data bidirectional driving circuit is used. Therefore, the disconnection detection circuit for liquid crystal display bidirectional driving provided by the present invention includes a disconnection detection circuit for gate bidirectional and data unidirectional driving and a disconnection detection circuit for gate bidirectional and data bidirectional driving.
[0032] refer to Figu...
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The invention discloses a wire breakage detection circuit and a wire breakage detection method for a liquid crystal display. According to the wire breakage detection circuit, the grid electrode of each first transistor is connected with each grid electrode signal wire, the source electrode of each first transistor is connected with each data signal wire, the first end of each data signal wire is connected with a data welding spot through a corresponding data lead, the first end of each grid electrode signal wire is connected with a grid electrode welding spot through a corresponding grid electrode lead, the source electrode of each second transistor is connected with a second end of a corresponding grid electrode signal wire, the drain electrode of each second transistor is connected with a grid electrode welding spot through a corresponding grid electrode lead, and the grid electrodes of a plurality of second transistors are connected in series so as to form a lead which is connected with peripheral welding spots. With the adoption of the circuit and the method, whether the signal wires are subjected to wire breakage or not and specific wire breakage positions can be detected.
Description
technical field [0001] The invention relates to a detection circuit in the field of liquid crystal display, in particular to a disconnection detection circuit and a detection method for bidirectional driving of a liquid crystal display. Background technique [0002] At present, in the design of large-size Thin Film Transistor-Liquid Crystal Display (TFT-LCD), bidirectional driving design method is often adopted to ensure uniform charging of pixels in the large-size display area. Therefore, the number of signal lines used is large. Generally, when designing a bidirectional circuit, it is necessary to detect the signal lines to determine whether there is a broken line, so as to improve the display quality of the liquid crystal display. [0003] The detection circuit of the current liquid crystal display dual drive circuit, such as figure 1 As shown, a plurality of gate signal lines 15 and a plurality of data signal lines 16, and a plurality of first transistors 11, the gates ...
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IPC IPC(8): G09G3/00G09G3/36
Inventor 付延峰
Owner TCL CHINA STAR OPTOELECTRONICS TECH CO LTD