摘要:
In a vertical retrace interval, a pre-charge potential or a signal potential is applied to each polarity for AC driving liquid crystal at least once each, so as to maintain fluctuations in pixel potential between the positive polarity side and the negative polarity side uniform, and minimum required potentials are supplied to the data signal line, thereby suppressing decrease in image quality without significantly increasing power consumption.
摘要:
An image display device of this invention includes a pre-charging voltage stabilizing section having current controlling means and charge holding means which respectively include a resistor and a capacitor to stabilize a pre-charging voltage. The charge holding means holds a voltage to be supplied to data signal lines, and the current controlling means suppresses a current flow from a control signal generating circuit, thereby suppressing power fluctuation at the control signal generating circuit. This suppresses fluctuation in the pre-charging voltage and enables data signal lines to be charged to a predetermined voltage, thereby suppressing deterioration of image quality and an increase in power consumption of the image display device. Further, when using the pre-charging voltage stabilizing section and setting a portion of a display as a video data non-display area avoiding display of video data in a non-match image display mode to display at fixed brightness in the video data non-display area by a pre-charging voltage from a pre-charging circuit, a control signal is suspended in a fixed period, thus realizing a non-match image display mode to display a video image of an aspect ratio different from that of a screen of a display without impairing an image quality, and saving power.
摘要:
A shift register circuit includes a plurality of latch circuits connected in series to sequentially transfer a pulse signal ST from one to another, a clock signal line transmitting a clock signal CLK, and a plurality of switching circuits performing electrical connection and disconnection between the clock signal line and the plurality of latch circuits. Upon turning on the shift register, at least one of the switching circuits electrically disconnects at least one of the latch circuits from the clock signal line. During an initialization period immediately after power has been turned on, the frequency of the clock signal CLK is lower than in a normal operation period and gradually increases toward the frequency used in the normal operation period.
摘要:
A shift register circuit includes a plurality of latch circuits connected in series to sequentially transfer a pulse signal ST from one to another, a clock signal line transmitting a clock signal CLK, and a plurality of switching circuits performing electrical connection and disconnection between the clock signal line and the plurality of latch circuits. Upon turning on the shift register, at least one of the switching circuits electrically disconnects at least one of the latch circuits from the clock signal line. During an initialization period immediately after power has been turned on, the frequency of the clock signal CLK is lower than in a normal operation period and gradually increases toward the frequency used in the normal operation period.
摘要:
A shift register circuit includes a plurality of latch circuits connected in series to sequentially transfer a pulse signal ST from one to another, a clock signal line transmitting a clock signal CLK, and a plurality of switching circuits performing electrical connection and disconnection between the clock signal line and the plurality of latch circuits. Upon turning on the shift register, at least one of the switching circuits electrically disconnects at least one of the latch circuits from the clock signal line. During an initialization period immediately after power has been turned on, the frequency of the clock signal CLK is lower than in a normal operation period and gradually increases toward the frequency used in the normal operation period.
摘要:
A driving method for an active-matrix-type image display in which: in the case when the number of divisions of a video signal decreases in accordance with the scanning frequency of an original video signal, eight video signal lines 31a through 31h are divided into groups the number of which corresponds the reduced number of divisions so that the same video signal is inputted to the video signal lines 31 belonging to the same group; and four systems of shift registers SRA through SRD are also divided into groups, SRA, SRB, SRC and SRD so that the same shift clock signal is inputted to the same group. With this method, even upon application of the device to a usage having a different scanning frequency, the construction of the external circuits are optimized so as to fit the different scanning frequency, and the shared use of the substrate is available so that cost reduction is achieved.
摘要:
A delay detecting section detects the phase difference between a first detection signal as a reference and a second detection signal produced by delaying the first detection signal with part of a data signal line driving circuit itself or part of a circuit formed by the same process as the data signal line driving circuit. A phase adjusting section presumes an internal delay of the data signal line driving circuit, and adjusts the phase difference between a clock signal and start signal, and a video signal so that the data signal line driving circuit samples the video signal at an appropriate timing. These structures prevent a lowering of the image quality due to a difference in the timings of the video signal and sampling signal, and provide an image display device capable of displaying a good-quality image with a simple circuit structure.
摘要:
An erasing device for a liquid crystal display image of the present invention is furnished with an auxiliary power source for continuously supplying power source to a liquid crystal display panel for a certain period after the main power source of the main body of the liquid crystal display device is turned OFF. Upon input of a power source OFF signal directing to turn OFF the main power source, a driving signal generating circuit and a driver controller light up the liquid crystal display panel entirely on a saturation voltage of the liquid crystal and subsequently shut off the same entirely using the power supply from the auxiliary power source. Consequently, it has become possible to erase an afterimage quickly on an active matrix liquid crystal display panel with a memory maintaining function of a liquid crystal display device, thereby not only upgrading the display quality, but also preventing deterioration of the liquid crystal caused by an application of an abnormal voltage associated with the occurrence of an afterimage.
摘要:
In a semiconductor device wherein an active device circuit and electrically conductive lines, such as a power source line for supplying power to the semiconductor active device circuit or signal lines for inputting a signal to the semiconductor active device circuit, are formed together on a single substrate, an improved arrangement wherein a conventional power source or signal line is formed by using a plurally of individual lines of substantially uniform electrical resistance where the electrical resistance of each line is limited to a predetermined value. Moreover, a waveform deterioration response signal component is added to a signal transmitted through the signal lines so as to improve the transmitted signal by compensating for waveform deterioration experienced during circuit operation. In addition, an electrical capacity forming electrode is provided alongside substantial length of the power source line. A capacitor is thus effectively formed within the active device circuit by intervening a dielectric between the power source line and the capacity forming electrode so as to reduce high-frequency noise which occurs in the power source line. The disclosed arrangements substantially reduce the occurrence of an irregular operation in the active device circuit.
摘要:
The image display apparatus of the present invention including a display device having a plurality of pixels arranged in a matrix and driven by a field sequential scanning system, includes: a display driving circuit for supplying a display signal to each of the pixels; a scanning circuit for supplying a scanning signal to each of the pixels, the scanning circuit allowing the pixel to receive a charge corresponding to the display signal during a predetermined write time; and a write time modulation circuit for modulating the write time of the pixel according to the progress of the scanning by the scanning circuit.