Abstract:
FLAT DISPLAY APPARATUS AND FLAT DISPLAY APPARATUS TESTING METHOD The present invention relates to a flat display apparatus and a flat display apparatus testing method, and is, for example, applicable to a liquid crystal display apparatus where drive circuits are integrally formed on an insulating substrate. The present invention is capable of carrying out a reliable screening of defective pixels so as to effectively avoid deterioration in reliability even in cases where transistors with low withstand voltages are employed. A common line-side wiring pattern COM of wiring patterns LCC and COM of a capacitor of pixels is connected to a precharge circuit externally in an independent manner.
Abstract:
A flat display unit is applied to, for example, a liquid crystal display unit having a drive circuit integrally formed on an insulating substrate to sample tone data Dod, Dev in respective systems on corresponding horizontal drive circuits (23O, 23E) at a timing corresponding to sampling conducted when tone data (D11) is distributed to a plurality of systems.
Abstract:
PROBLEM TO BE SOLVED: To provide a level conversion circuit, a display apparatus, and a mobile terminal using the same, capable of amplifying the same input voltage as a power source voltage of an IC using low-temperature poly-silicon which has a high threshold voltage value and large variations. SOLUTION: The display apparatus comprises: MCK level shifters 171-1, 171-2 of a type requiring a periodical reset action; a logical circuit 173 which outputs a signal for inputting a reset pulse having a period of an N horizontal period for the MCK level shifters 171-1, 171-2 using a level-shifted horizontal synchronous signal Hsync by shifting the phase for the M horizontal period (however, M
Abstract:
PROBLEM TO BE SOLVED: To solve the problem that when the power source of a level conversion circuit is always made to be in an ON state, unnecessary consumption of DC current occurs and it becomes the hindrance in reducing the power consumption of the whole of the driving circuit in the liquid crystal display of a selector driving system. SOLUTION: In the liquid crystal display of the selector system which selects and drives signal lines 17-1 to 17-m of a pixel part 11 by making three lines of R, G, B one set with selectors 13-1 to 13-k of a selector circuit 13 in time- division manner, a level conversion circuit 14 for level-shifting selector pulses Sel B, Sel G, Sel R having the voltage amplitude of the power source of the external circuit into selector pulses SEL B, SEL G, SEL R having the voltage amplitude of a power source of the internal circuit is made to be in a non-active state in the section of a non-display area in a partial display mode under the control of a control signal CNT and the consumption of the DC current in the level conversion circuit 14 is reduced. COPYRIGHT: (C)2004,JPO
Abstract:
PROBLEM TO BE SOLVED: To solve the problem that a contrast at the time of a low temperature is lowered due to the deterioration of the frequency characteristics of the dielectric constant of a liquid crystal in a liquid crystal display. SOLUTION: In an active matrix type liquid crystal display which performs a precharging operation for writing a precharge signal Psig to respective data lines 12-1 to 12-6 by a precharge switch 19 before writing a display signal to the data lines in a display area 14 by a data driver 17, the contrast at the time of the low temperature is increased by using a gradation level when a voltage is not applied to the liquid crystal, for example, a common voltage VCOM as the precharge signal Psig. COPYRIGHT: (C)2004,JPO
Abstract:
PROBLEM TO BE SOLVED: To effectively avoid a delay time change in a logic circuit formed of TFTs by applying this invention to, for instance, a liquid display unit having an integral structure composed of an insulating board and a drive circuit formed thereon as to a delay time correction circuit, a video data processing circuit, and a flat display device. SOLUTION: Dummy data are inserted into input data D1 so as to forcibly switch the logic level of the input data D1 (4). COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To securely carry out screening for a defective pixel by effectively avoiding deterioration in reliability even when a transistor with low breakdown voltage is used by applying a flat display device and a testing method for the flat display device to, for example, a liquid crystal display device having a driving circuit formed on an insulating substrate in one body. SOLUTION: A common-side wiring pattern COM between wiring patterns LCC and COM relating to a capacitor 4 of a pixel is connected to a precharge circuit 9 independently at the outside. COPYRIGHT: (C)2005,JPO&NCIPI