Abstract: The display system of the present invention includes: a body unit (1) for transmitting image data that has been generated; and a display device (2) for displaying an image in accordance with the image data that has been transmitted from the body unit (1), and said display system is characterized in that the body unit (1) and the display device (2) perform communications via radio communication means, and the body unit (1) and the display device (2) are separately providable. Thus, the radio transmission is used as communication means, and there is no cable, connecting the display device (2) and the body unit (1), that transfers the data signal, so that the device user can operate the system freely while watching the display device (2). As a result, it is possible to improve the workability of the user of the present display system.

Abstract: Each signal line enters a preliminary polarity inversion period prior to a normal polarity inversion period so as to be inverted to the opposite polarity. By the preliminary polarity inversion a signal line on a border of blocks experiences a potential hike and the potential oscillates, which, however, is restored later by the application of a correct potential in the normal polarity inversion period. When transferring data per block, the problem of different potential states between the border of the blocks and an area surrounding it, which is caused by the potential oscillation of the signal line on the border of the blocks, is relieved.

Abstract: The display system of the present invention includes: a body unit for transmitting display data that has been generated; and a display device for displaying an image in accordance with the display data that has been transmitted from the body unit. The display system is characterized in that the body unit and the display device perform communications via radio communication means, and the body unit and the display device are separately provided. Thus, the radio transmission is used as communication means, and there is no cable connecting the display device and the body unit that transfers the display data, so that the user can operate the system freely while watching the display device.

Abstract: The display system of the present invention includes: a body unit (1) for transmitting image data that has been generated; and a display device (2) for displaying an image in accordance with the image data that has been transmitted from the body unit (1), and said display system is characterized in that the body unit (1) and the display device (2) perform communications via radio communication means, and the body unit (1) and the display device (2) are separately providable. Thus, the radio transmission is used as communication means, and there is no cable, connecting the display device (2) and the body unit (1), that transfers the data signal, so that the device user can operate the system freely while watching the display device (2). As a result, it is possible to improve the workability of the user of the present display system.

Abstract: Each signal line enters a preliminary polarity inversion period prior to a normal polarity inversion period so as to be inverted to the opposite polarity. By the preliminary polarity inversion a signal line on a border of blocks experiences a potential hike and the potential oscillates, which, however, is restored later by the application of a correct potential in the normal polarity inversion period. When transferring data per block, the problem of different potential states between the border of the blocks and an area surrounding it, which is caused by the potential oscillation of the signal line on the border of the blocks, is relieved.

Abstract: Disclosed is a portable information apparatus, which is provided with a display section capable of displaying a color display and a dynamic display in a high image quality, and which consumes less electricity. When the portable information apparatus of a folder type is in a folded state, a display screen 100 is composed of an image display region and a non-image region, so that at least a part of the image display region can be seen via a transparent section 102.

Abstract: In an active matrix type display device, a signal voltage is applied from a signal line driving circuit via an active element such as a TFT to display electrodes on a matrix substrate, and a common voltage is applied to a counter electrode on a facing substrate so that the common voltage is shared by respective display cells. A level of the common voltage is switched in every refresh period of a different length. Thus, it is possible to appropriately set a value of the common voltage which is a reference for specifying an effective voltage of positive polarity and an effective voltage of negative polarity according to the refresh periods. As a result, even when the refresh periods of a different length exist in a mixed manner, it is possible to equalize the effective voltage of positive polarity and the effective voltage of negative polarity so as to suppress an occurrence of a flicker.

Abstract: Each signal line enters a preliminary polarity inversion period prior to a normal polarity inversion period so as to be inverted to the opposite polarity. By the preliminary polarity inversion a signal line on a border of blocks experiences a potential hike and the potential oscillates, which, however, is restored later by the application of a correct potential in the normal polarity inversion period. When transferring data per block, the problem of different potential states between the border of the blocks and an area surrounding it, which is caused by the potential oscillation of the signal line on the border of the blocks, is relieved.

Abstract: An active matrix liquid crystal display drives liquid crystal by writing through TFTs, etc. a source signal from a signal line drive circuit to display electrodes in display cells on a matrix substrate and applying a common signal supplied from a common signal generator to common electrodes on an opposite substrate, the common signal changing in polarity in each frame. After scanning is completed for scan lines corresponding to one frame, a controller controls the interval between scan periods and the cycle of change in polarity of the common signal so as to provide a non-scan period that is longer than the scan period. The provision of the non-scan period extends the duration in which a specified voltage is retained by the display cell. This reduces the effects of variations in retained voltages caused by parasitic capacitance which develops in reflective electrode structures in which the display electrodes partly overlook scan lines and signal lines.

Abstract: The display system of the present invention includes: a body unit (1) for transmitting image data that has been generated; and a display device (2) for displaying an image in accordance with the image data that has been transmitted from the body unit (1), and said display system is characterized in that the body unit (1) and the display device (2) perform communications via radio communication means, and the body unit (1) and the display device (2) are separately providable. Thus, the radio transmission is used as communication means, and there is no cable, connecting the display device (2) and the body unit (1), that transfers the data signal, so that the device user can operate the system freely while watching the display device (2). As a result, it is possible to improve the workability of the user of the present display system.

Abstract: Disclosed is a portable information apparatus, which is provided with a display section capable of displaying a color display and a dynamic display in a high image quality, and which consumes less electricity. When the portable information apparatus of a folder type is in a folded state, a display screen 100 is composed of an image display region and a non-image region, so that at least a part of the image display region can be seen via a transparent section 102.

Abstract: An active matrix liquid crystal display drives liquid crystal by writing through TFTs, etc. a source signal from a signal line drive circuit to display electrodes in display cells on a matrix substrate and applying a common signal supplied from a common signal generator to common electrodes on an opposite substrate, the common signal changing in polarity in each frame. After scanning is completed for scan lines corresponding to one frame, a controller controls the interval between scan periods and the cycle of change in polarity of the common signal so as to provide a non-scan period that is longer than the scan period. The provision of the non-scan scan period extends the duration in which a specified voltage is retained by the display cell. This reduces the effects of variations in retained voltages caused by parasitic capacitance which develops in reflective electrode structures in which the display electrodes partly overlook scan lines and signal lines.

Abstract: In an active matrix type display device, a signal voltage is applied from a signal line driving circuit via an active element such as a TFT to display electrodes on a matrix substrate, and a common voltage is applied to a counter electrode on a facing substrate so that the common voltage is shared by respective display cells. A level of the common voltage is switched in every refresh period of a different length. Thus, it is possible to appropriately set a value of the common voltage which is a reference for specifying an effective voltage of positive polarity and an effective voltage of negative polarity according to the refresh periods. As a result, even when the refresh periods of a different length exist in a mixed manner, it is possible to equalize the effective voltage of positive polarity and the effective voltage of negative polarity so as to suppress an occurrence of a flicker.

Abstract: Each signal line enters a preliminary polarity inversion period prior to a normal polarity inversion period so as to be inverted to the opposite polarity. By the preliminary polarity inversion a signal line on a border of blocks experiences a potential hike and the potential oscillates, which, however, is restored later by the application of a correct potential in the normal polarity inversion period. When transferring data per block, the problem of different potential states between the border of the blocks and an area surrounding it, which is caused by the potential oscillation of the signal line on the border of the blocks, is relieved.

Abstract: According to a driving method of a matrix-type display device of the present invention, a reference clock signal supplied by a reference clock oscillator is divided by a plurality of frequency dividing circuits, so that division clock signals are obtained. One among the division clock signals is selected by a switching operation by a switching circuit, and the selected division clock signal is outputted as a sampling clock signal to a row electrode driving circuit. Timings for the switching operation of the switching circuit are controlled by a switching control circuit in accordance with a horizontal synchronization signal and the reference clock signal. One or more of the frequency dividing circuits outputs a division clock signal having unequal clocks, when necessary. By thus arranging the division clock signals so that they have unequal clocks, it is allowed to set N of the division ratio 1/N to a value other than an integral number.

Abstract: A driving circuit for an image display device includes a signal generating circuit for generating an initiation control signal for controlling the initiation of sampling of a video signal to be input, and a sampling pulse timing signal for determining timing of sampling. When a set of discrete signals is input as the video signal, the signal generating circuit generates two sampling pulse timing signals whose phases differ from each other, selects one of the sampling pulse timing signals alternately in each horizontal scanning period, and outputs the selected sampling pulse timing signal to a shift register in a source driver. The signal generating circuit also switches the output signal between the two sampling pulse timing signals in a set of four fields.

Abstract: On a matrix form display panel which realizes a display device with a high image quality, the return circuits of condensers, connected to picture elements in the last row among picture elements arranged in a matrix form, are connected to a common line independently of the return circuits of the condensers in the other rows, a common electrode driving circuit is provided, and a common electrode driving voltage is applied, whereby the effective values of driving voltages applied to the picture elements in the last row are equalized to the effective values of driving voltages applied to the picture elements in the other rows. Thereby, all the picture elements forming the panel are equal in optical transmissivity, and as a result the displayed image quality is improved. Additionally, since the last scanning line can be used for displaying, the utility factor of display panel is enhanced.

Abstract: A driving method of the invention is suitable for an active matrix type liquid crystal display apparatus having row and column electrodes. The driving method includes the steps of applying a gate-one pulse for writing data for one line to the column electrodes to each of the row electrodes. The gate-on pulse has a pulse waveform which includes at least one concave portion during a horizontal period.

Abstract: A matrix-type display device capable of effecting color-displaying is constructed such that the mode of sampling neighboring RGB data can be optionally selected from two modes, e.g., three-point successive sampling mode and three-point simultaneous sampling mode. In the case of the three-point successive sampling mode, since pulses are generated successively so that each pulse is shifted by one-dot term .tau. from one another, the pulse terms of sampling pulses are shifted by one-dot term .tau. from one another. Accordingly, pixel signals supplied to respective three neighboring RGB pixels are shifted by one-pixel equivalent. On the other hand, in the case of the three-point simultaneous sampling, generated pulses all stay at high level at any time. Therefore, the pulse terms of sampling pulses are made coincident, so that pixel signals supplied to respective three neighboring RGB pixels are of data on an identical point.

Abstract: When a specific signal (such as copy guard signal) is added between horizontal synchronizing signals in a composite synchronizing signal, and the addition period of the specific signal is defined in a specific period on the basis of the vertical synchronizing signal, the composite synchronizing signal is masked to remove the specific signal, thereby obtaining a masked composite synchronizing signal. Afterwards, from the masked composite synchronizing signal, the horizontal synchronizing signal and vertical synchronizing signal are obtained. In the case of composite synchronizing signal containing noise, without masking, the horizontal synchronizing signal and vertical synchronizing signal are directly obtained from the composite synchronizing signal. Therefore, when noise is not present, the horizontal synchronizing signal and vertical synchronizing signal may be obtained without disturbing the video image.