Abstract: A digital-to-analog conversion circuit includes a gradation voltage generation circuit, a most-significant-bits decoder circuit, a least-significant-bits decoder circuit and a calculation circuit. The gradation voltage generation circuit generates multiple main voltages corresponding to most significant bits of the inputted data, and multiple sub voltages corresponding to least significant bits of the inputted data. The most-significant-bits decoder circuit selects one of the main voltages in accordance with the most significant bits, and the least-significant-bits decoder circuit selects one of the sub voltages in accordance with the least significant bits. The calculator circuit performs calculation processing by use of a first main voltage selected by the most-significant-bits decoder circuit, a first sub voltage selected by the least-significant-bits decoder circuit, and a reference voltage.

Abstract: A gradation potential generation circuit includes a first ladder resistance circuit supplied with a first and a second reference voltages to both ends to generate j number of gradation potentials (j is an integer of 2 or more) and output the generated j number of gradation potentials to j number of first nodes, where the j number of gradation potentials being generated by dividing the first and the second reference voltages, a second ladder resistance circuit to generate k number of gradation potentials out of the j number of gradation potentials (where j>k) generated by the first ladder resistance circuit and k number of switches to supply the k number of gradation potentials generated by the second ladder resistance circuit to k number of first nodes out of the j number of first nodes according to a first control signal.

Abstract: A display device includes a display panel, a data line driving circuit, a timing control unit and a parameter output unit. The data line driving circuit drives data lines on the display panel. The timing control unit outputs an input gradation signal based on an image signal to the data line driving circuit at a predetermined timing. The parameter output unit outputs a conversion parameter for executing gamma correction corresponding to characteristics between a driving voltage and a luminance of the display panel. The data line driving circuit includes: a correction circuit which converts the input gradation signal to an output gradation signal based on the conversion parameter and outputs the converted signal, and a D/A conversion circuit which converts the output gradation signal to a data line driving signal of an analog signal and drive the data lines.

Abstract: In a data converting circuit, an approximation calculation circuit calculates an approximation value of an output to input data by using an n-th order equation (n is an integer equal to or more than one). An error reducing circuit generates an error correction value by using a multiplication factor determined based on the input data. An addition section adds the approximation value and the error correction value and outputs an addition result.

Abstract: The invention is objected to perform fixing in an optimum fixing condition even with various kinds of recording materials or the like while improving usability by discriminating the kinds of recording materials. An image reading sensor 123 includes a reflective LED 301, a transmissive LED 303 disposed on the opposite side relative to a recording material 304 for detecting the transmitted amount of light, a CMOS area sensor 211, and an imaging lens 1113. The light from the reflective LED 301 as a light source is applied toward the surface of the recording material 304, and the reflected light from the recording material 304 is collected via the lens 303 and an image is formed on the CMOS area sensor 211. The LED 301 is disposed so as to apply LED light to the surface of the recording material 304 diagonally at a predetermined angle.

Abstract: The invention is objected to perform fixing in an optimum fixing condition even with various kinds of recording materials or the like while improving usability by discriminating the kinds of recording materials An image reading sensor 123 includes a reflective LED 301, a transmissive LED 303 disposed on the opposite side relative to a recording material 304 for detecting the transmitted amount of light, a CMOS area sensor 211, and an imaging lens 1113. The light from the reflective LED 301 as a light source is applied toward the surface of the recording material 304, and the reflected light from the recording material 304 is collected via the lens 303 and an image is formed on the CMOS area sensor 211. The LED 301 is disposed so as to apply LED light to the surface of the recording material 304 diagonally at a predetermined angle.

Abstract: A sensor system includes an LED configured to emit light to a recording medium and a light-receiving sensor configured to receive a transmitted light that has passed through the recording medium after having been emitted from the LED to the recording medium. An emitting optical axis of the LED is away from a perpendicular receiving optical axis of the light-receiving sensor.

Abstract: It reduces a moving distance of a recording medium and thereby reduces the moving distance to be secured in an image forming apparatus so as to reduce size of the apparatus by a simple method. It is possible to feed a recording medium 304 at lower speed than normal speed on calibrating of a sensor unit 123 so as to reduce a distance passed by the recording medium 304. It is possible to render the moving distance of the recording medium half by rendering feeding speed on the calibrating half the normal speed.

Abstract: The invention is objected to perform fixing in an optimum fixing condition even with various kinds of recording materials or the like while improving usability by discriminating the kinds of recording materials An image reading sensor 123 includes a reflective LED 301, a transmissive LED 303 disposed on the opposite side relative to a recording material 304 for detecting the transmitted amount of light, a CMOS area sensor 211, and an imaging lens 1113. The light from the reflective LED 301 as a light source is applied toward the surface of the recording material 304, and the reflected light from the recording material 304 is collected via the lens 303 and an image is formed on the CMOS area sensor 211. The LED 301 is disposed so as to apply LED light to the surface of the recording material 304 diagonally at a predetermined angle.