Abstract: A liquid-crystal display apparatus free from chrominance non-uniformity. In a liquid-crystal display apparatus with a primary color video signal and a common voltage supplied to a liquid-crystal display panel, a correction signal for canceling the chrominance non-uniformity is superimposed on the primary color video signal.

Abstract: A liquid-crystal display device performs a feedback process. A video signal is written on pixels on a unit by unit basis, each unit including a plurality of pixels (six pixels, for example). Scan pulses output from RGB LCD panels are supplied to a driver IC that supplies the RGB LCD panels with a variety of timing signals. A delay amount from the scan pulses from the optimum state thereof is measured. The delay amount is accounted for in a pulse that samples and holds the video signal, i.e., a pulsewidth control clock pulse.

Abstract: Because the dynamic range of a solid-state image sensor is relatively narrow, it is necessary to reduce the amount of light using an aperture so that the amount of light incident on the solid-state image sensor is within the range of the dynamic range. However, the amount of control at this time may exceed a controllable range which is the maximum limit of an amount in which diffraction is not generated. As a result, the amount of control by the aperture is determined so that the amount of control by the aperture does not exceed the controllable range, and an ND filter, which corresponds to or is approximate to the amount of control of reduced light which was obtained by subtracting the amount of control by the aperture from the total amount of control, is placed on an optical path.

Abstract: Because the dynamic range of a solid-state image sensor is relatively narrow, it is necessary to reduce the amount of light using an aperture so that the amount of light incident on the solid-state image sensor is within the range of the dynamic range. However, the amount of control at this time may exceed a controllable range which is the maximum limit of an amount in which diffraction is not generated. As a result, the amount of control by the aperture is determined so that the amount of control by the aperture does not exceed the controllable range, and an ND filter, which corresponds to or is approximate to the amount of control of reduced light which was obtained by subtracting the amount of control by the aperture from the total amount of control, is placed on an optical path.

Abstract: There is provided an image reading method and apparatus which, even when the position where slit light is irradiated changes due to vibration during image reading, can prevent variation of the amount of transmitted light or reflected light within a region read by a solid-state image pickup device (i.e., a read range). A reflector having a half-split structure (two parts) is disposed and each first focal point of the two parts of reflector is located at the same position (i.e., the position where a halogen lamp is disposed). Respective second focal points of the two parts of reflector are located at different positions apart from the center of an illumination region in opposite directions. The distribution of the amount of light in this case is such that a range in which the amount of light becomes substantially uniform comes to about one and a half the read width of a CCD line sensor and the ratio of the minimum amount of light in this width becomes about 80% of the maximum amount of light.