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| Number | Title | Issue Date |
| 7301320 | On-chip high frequency power supply noise sensor The on-chip power supply noise sensor detects high frequency overshoots and undershoots of the power supply voltage. By creating two identical current sources and attaching a time constant circuit to only one, the high frequency transient behavior differs while the ... | 11/27/2007 |
| 7283179 | Liquid crystal television apparatus Disclosed herein is a video signal process circuit that includes a control circuit having a level detection circuit and a dynamic range switch circuit. In the control circuit and a microcomputer, an average luminance of an image displayed on a liquid crystal panel v... | 10/16/2007 |
| 7199830 | Image pickup apparatus including selective insertion of ND filter into taking lens optical path based on luminance of object to be imaged In a digital camera using an ND filter to be inserted into an optical path of an optical lens system, defocus quantity of the taking lens and imbalance of white balance due to the insertion of the ND filter are previously calculated or measured. The ND filter is ins... | 04/03/2007 |
| 7190409 | Method for displaying an image having a maximal brightness An electro-optical device and a method for displaying an image are disclosed. A clear image with a clear profile can be displayed therein by processing input image data, for example input image data of TV broadcasting received by the device. ... | 03/13/2007 |
| 7113227 | Gradation correcting apparatus gradation correcting method and video display apparatus The present invention has an object to provide a gradation correcting apparatus for correcting the gradation of the white side of a video luminance signal. The gradation correcting apparatus is provided with a maximum value detector 101 for detecting a... | 09/26/2006 |
| 7095451 | Image processing system, projector, information storage medium and black and white extension processing method To provide an image processing system, projector, information storage medium and black and white extension processing method which can improve the quality of image when at least one of white extension and black extension is performed to video signals, a extension de... | 08/22/2006 |
| 6967692 | Apparatus for processing luminance signal A luminance signal processing apparatus that detects an average luminance level, adaptively to various video signal formats. This luminance signal processing apparatus includes a window pulse generation unit 101 for generating a window pulse signal S110 | 11/22/2005 |
| 6952235 | Apparatus and method for controlling black stretch of video signal An apparatus and method for adaptively varying a black stretch control range and a gain according to a mean level of a video signal to control black stretch of the video signal. According to the apparatus and method, the slope and range of black stretch are varied d... | 10/04/2005 |
| 6825887 | Color component signal interface circuit An interface circuit 13 is provided for a display apparatus 3 such as a television. The display apparatus 3 comprises a video signal processing circuit 8 for processing a composite video signal to derive color component signals having var... | 11/30/2004 |
| 6809712 | Drive circuit of liquid crystal display, having clip circuit before polarity inversion circuit A drive circuit of an LCD is disclosed, by which no image signal having a voltage level over the dynamic range of the video amplifier, and thus erroneous operation of the video amplifier is prevented, thereby supplying normal image signals to the LCD. The drive circ... | 10/26/2004 |
| 6490004 | Video signal receiver with level limited output A video signal processing apparatus includes a receiver receiving an incoming video signal and producing an output video signal in response thereto, a limit setup unit setting up at least one of an upper limit value and a lower limit value for the output ... | 12/03/2002 |
| 6490003 | Video signal receiver with level limited output A video signal processing apparatus includes a receiver receiving an incoming video signal and producing an output video signal in response thereto, a limit setup unit setting up at least one of an upper limit value and a lower limit value for the output ... | 12/03/2002 |
| 6483549 | Video signal receiver with level limited output A video signal processing apparatus includes a receiver receiving an incoming video signal and producing an output video signal in response thereto, a limit setup unit setting up at least one of an upper limit value and a lower limit value for the output ... | 11/19/2002 |
| 6317163 | Video signal receiver with level limited output A video signal processing apparatus includes a receiver receiving an incoming video signal and producing an output video signal in response thereto, a limit setup unit setting up at least one of an upper limit value and a lower limit value for the output ... | 11/13/2001 |
| 6081302 | Image quality correction circuit and method based on color density An image quality correction circuit having a variable gain amplifier for amplifying an extracted high-frequency component of a luminance signal in such a manner that the gain thereof is increased when detected color density is high, and is reduced when th... | 06/27/2000 |
| 6064447 | Pure red color detection circuit and color compensation circuit using the same Red color saturation is increased and red color with higher purity can be reproduced by composing: a red color detection circuit 1 for detecting a red color signal having higher purity by inputting color differential signals (R-Y) and (B-Y) modulated by c... | 05/16/2000 |
| 6023304 | Image quality correction circuit and method based on color density An image quality correction circuit having a variable gain amplifier for amplifying an extracted high-frequency component of a luminance signal in such a manner that the gain thereof is increased when detected color density is high, and is reduced when th... | 02/08/2000 |
| 6023305 | Primary color video signal output circuit A primary color video output circuit for limiting an input video signal. The circuit includes a clipping circuit, a reference voltage generating circuit and an amplifier. The clipping circuit limits the level of the input video signal based on a reference... | 02/08/2000 |
| 6018373 | Image quality correction circuit and method based on color density An image quality correction circuit having a variable gain amplifier for amplifying an extracted high-frequency component of a luminance signal in such a manner that the gain thereof is increased when detected color density is high, and is reduced when th... | 01/25/2000 |
| 6002448 | Image quality correction circuit and method based on color density An image quality correction circuit having a variable gain amplifier for amplifying an extracted high-frequency component of a luminance signal in such a manner that the gain thereof is increased when detected color density is high, and is reduced when th... | 12/14/1999 |
| 5929843 | Image processing apparatus which extracts white component data A method and apparatus for processing image data comprising the steps of extracting white component data from input R, G, B color data, suppressing the white component data in accordance with a non-linear characteristic, generating R, G, B, W display data... | 07/27/1999 |
| 5910823 | Image quality correction circuit and method based on color density An image quality correction circuit having a variable gain amplifier for amplifying an extracted high-frequency component of a luminance signal in such a mariner that the gain thereof is increased when detected color density is high, and is reduced when t... | 06/08/1999 |
| 5903320 | Video amplifier circuit having multiple amplifier circuits with different amounts of feedback A video amplifier includes three amplifier circuits (TR, TG, TB) for the red, the green and the blue signals which are each provided with a different feedback signal which changes value when the signal exceeds a certain threshold, by a feedback resistor c... | 05/11/1999 |
| 5892555 | Video signal clamping circuit A video signal clamping circuit for maintaining a constant clamping output level is disclosed including a clamper for generating a clamping output level in response to a reference voltage by use of an external condenser receiving a video signal and a plur... | 04/06/1999 |
| 5734440 | White clip circuit A white clip circuit, formed as an integrated circuit, includes a negative impedance converter which in use is operative to increase the sensitivity of an inverting long-tailed pair of transistors adapted to invert the signals and feed them back to the in... | 03/31/1998 |
| 5663769 | Image quality correction circuit based on color density An image quality correction circuit having a variable gain amplifier for amplifying an extracted high-frequency component of a luminance signal in such a manner that the gain thereof is increased when detected color density is high, and is reduced when th... | 09/02/1997 |
| 5640212 | Video signal clipping circuitry and method for color television broadcasting Cost effective video clipping circuitry and method achieve lower distortion color television broadcasting. Excess "white" level voltage peaks in otherwise standard (e.g., that of the National Television Standards Committee) color line video signals are cl... | 06/17/1997 |
| 5621480 | Image quality correction circuit and method based on color density An image quality correction circuit having a variable gain amplifier for amplifying an extracted high-frequency component of a luminance signal in such a manner that the gain thereof is increased when detected color density is high, and is reduced when th... | 04/15/1997 |
| 5512948 | Negative-image signal processing apparatus The white peak level and black peak level of each of three types of color signals R, G and B obtained by picking up a negative image are detected. The amplitudes and levels of the signals are adjusted in such a manner that the white peak levels of the col... | 04/30/1996 |
| 5311300 | Circuit arrangement for accurately adjusting each color channel of a picture signal generator using digital control signals A circuit arrangement for adaptive white-compression of video signals of a color television apparatus, particularly of a HDTV picture signal generator, which has a signal minimum detector circuit (4, 5, 6) in each color channel. Input color signals (R, G,... | 05/10/1994 |
| 5301024 | Video signal peak compressor A video signal peak compressor circuit includes an emitter follower stage together with a feedback amplifier having a conduction threshold determined by a pair of voltage divider resistors. The feedback amplifier responds to increased conduction of the em... | 04/05/1994 |
| 5299000 | Video white signal compression and peaking A video white compression and peaking arrangement comprises a plurality of inverting amplifier transistors each tied to a common threshold level. RGB input video signals are applied to the inverting amplifier transistors which are ineffective for signals ... | 03/29/1994 |
| 5294985 | Signal limiting apparatus having improved spurious signal performance and methods A limiter circuit responds to an input signal which has a plurality of frequencies within a given band. The input signal is split up into two frequency ranges by means of a low pass filter for one range and a high pass filter for a second range. The outpu... | 03/15/1994 |
| 5097337 | Apparatus and method for limiting digital video signals A digital limiter for processing a digital video signal includes a limiter stage whose output is subtracted from the input to the stage in a subtracting stage. The resulting difference signal is accumulated by means of an accumulating device. The accumula... | 03/17/1992 |
| 5021886 | Video signal processor for a color liquid crystal display A video signal processor for processing a composite video signal to be fed to color liquid crystal (LC) panels of a color liquid crystal display which are each assigned to a different color. The pedestal level of each color signal included in the video si... | 06/04/1991 |
| 5003394 | Dynamic video system including automatic contrast and "white-stretch" processing sections A television system is disclosed including sections for limiting peak white drive to a display device (e.g., of the direct view of projection type) while maintaining relatively high subjective image contrast and brightness. Specifically, the system includ... | 03/26/1991 |
| 4937670 | Peak detector with feedback A very fast peak detector having feedback is presented. A first device charges a storage capacitor to a voltage proportional to the peak voltage of an incoming signal. A second device coupled to the first device in a feedback configuration further charges... | 06/26/1990 |
| 4918529 | Device for setting minimal and maximal frequencies of a frequency modulated video signal A frequency control apparatus automatically sets minimum and maximum reference frequencies (fmin and fmax) of a frequency modulated video luminance signal. An insertion circuit receives first and second reference voltages correspondi... | 04/17/1990 |
| 4821100 | Image signal compressor An image signal compressor having a controller for adjusting the compression start potential in such a way as to decrease it with increasing highest peak voltage level of three chrominance signals to be compressed, in addition to three first resistors, th... | 04/11/1989 |
| 4760450 | Limiter circuit for preventing blooming in a video display terminal A limiter circuit for video display terminal which produces contrast voltage comprises an amplifier for amplifying video signals received from a source thereof, and a series of transistors receiving the video signal from the amplifier, arranged for select... | 07/26/1988 |
