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3M employee and church chorister Art Fry needed something to temporarily mark pages in his hymnal. He was in luck because his colleague, Spencer Silver, accidentally developed a glue that was too weak for other purposes. After initially discouraging consumer response, Post-it Notes became a hit in 1979.
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| Number | Title | Issue Date |
| 8154664 | Method and apparatus for DC restoration using feedback A feedback circuit for restoration of DC in video signals is presented. A sample pulse representing the back porch of an incoming video signal is generated from the horizontal sync signal. The sample pulse triggers a sample and hold circuit to acquire the correct of... | 04/10/2012 |
| 7787057 | Method and apparatus for DC restoration using feedback A feedback circuit for restoration of DC in video signals is presented. A sample pulse representing the back porch of an incoming video signal is generated from the horizontal sync signal. The sample pulse triggers a sample and hold circuit to acquire the correct of... | 08/31/2010 |
| 7345714 | Video signal clamp A circuit and method for clamping a composite video component signal at the video black level by using horizontal synchronization timing information contained within the signal and clamping the signal during a time interval in which it is at the desired black level.... | 03/18/2008 |
| 7268800 | Image processing system and information processing apparatus An image processing system is disclosed, wherein a demountable image pickup apparatus comprises operating means such as a keyboard, a portable computer having control means that is a CPU, image pickup means, and program storage means, which is a ROM or RAM, for stor... | 09/11/2007 |
| 7154563 | Automatic brightness limitation for avoiding video signal clipping A brightness limitation system is employed in a television circuit to prevent the black reference voltage level and the video signal from entering a minimum signal clipping zone, to provide precise correction signal, limiting the brightness, to maintain a constant b... | 12/26/2006 |
| 7138993 | LCD with integrated switches for DC restore An AC-coupled display driver circuit includes one or more DC-restore switches that are integrated within a liquid crystal display. A liquid crystal display system includes a coupling capacitor coupled at one end to a system input video signal, the coupling capacitor... | 11/21/2006 |
| 7106231 | Video signal processing system including analog to digital converter and related method for calibrating analog to digital converter A video signal processing system capable of adjusting errors and related methods are introduced. The video signal processing system and related calibration methods utilize the characteristic of periodic breaks of video signals to perform various kinds of calibration... | 09/12/2006 |
| 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 |
| 7038669 | System and method for providing a reference video signal A method is taught for providing a reference video signal to a video display through a video interface from a video display adapter for a host computer. The method includes the step of providing a horizontal sync line to carry a horizontal sync signal that occupies ... | 05/02/2006 |
| 7023497 | Clamping circuit with wide input dynamic range for video or other AC coupled signals A clamping circuit disclosed herein has two modes of operation which include both a bottom level and mid-level clamping mode for clamping automatically onto the sync tip of a video signal and customizably clamping onto the front porch, back porch/pedestal or anywher... | 04/04/2006 |
| 6970203 | Automatic cut-off system The automatic cut-off system includes a video data processing circuit, a cut-off control circuit, a drive circuit, and a level control section. The video data processing circuit adds a cut-off reference pulse having a predetermined level to primary-color signals of ... | 11/29/2005 |
| 6967691 | Color difference signal processing A color video display signal processor comprises a source of a color difference signal and an analog to digital converter for converting the color difference signal to a digital signal. A potential divider is coupled to reference voltages of the analog to digital co... | 11/22/2005 |
| 6507373 | Video stabilizing circuit for display apparatus In a video stabilizing circuit for a display apparatus, the clamp levels of R, G and B chromatic signals are controlled by feeding back the output currents of respective R, G and B terminals so that real time responses can be made, as against the fluctuat... | 01/14/2003 |
| 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 |
| 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 |
| 5864371 | Luminance signal generation circuit with single clamp in closed loop configuration and horizontal synchronization pulse generation A luminance signal generation circuit with single clamp and horizontal synchronization pulse generation circuit generates a separate luminance video signal Y, representing RGB input signals, and having a horizontal synchronization pulse. During a burst pe... | 01/26/1999 |
| 5663770 | White balance circuit in which low light adjustment is not influenced by high light adjustment A color picture display apparatus is provided having a driving circuit for a display device so that a low light adjustment is not influenced by a high light adjustment during white balance adjustment. Horizontal blanking period is blanked by a transistor ... | 09/02/1997 |
| 5530487 | Video signal clamping arrangement located downstream of a multiplexer Video components U and V are applied to an input of a multiplexer. An output signal of the multiplexer is clamped using a clamper that is common for each of the video signal components. An input of the multiplexer is located upstream of the clamper. The c... | 06/25/1996 |
| 5526058 | Video signal adjusting apparatus, display using the apparatus, and method of adjusting the display A color corrector receiving a video signal as an input signal and producing an output signal representing a function of power of the input signal includes a logarithmic converter for achieving a logarithmic conversion of the input signal and outputting a ... | 06/11/1996 |
| 5502508 | Gradation compensating apparatus for a video signal A gradation compensating apparatus comprises a skin color detecting circuit for detecting a skin color signal from an inputted color difference signal, a compensation amount controlling circuit for controlling the signal level by the skin color detecting ... | 03/26/1996 |
| 5473390 | Component to composite video signal converter circuit A bias source (R7,R8,C24) connected to a summing amplifier (Q1) produces a first DC bias at the amplifier input (emitter) and a second DC bias at the amplifier output (collector). A first circuit node (B) is AC coupled (22) to a luminance signal source (Y... | 12/05/1995 |
| 5453798 | Black compensation circuit for a video display system A driver for a cathode ray tube includes a black level compensation circuit which generates an offset voltage which tracks the current flowing to the output of the driver and therefore the average picture level (APL). The offset voltage is added as a comp... | 09/26/1995 |
| 5448308 | Apparatus for clamping a video signal level A video signal clamp involves evaluating the difference between the signal level and the desired clamp level during the back porch interval. A correction signal indicates whether the signal level must be increased or decreased to establish the desired cla... | 09/05/1995 |
| 5424774 | Image sensing apparatus An image sensing apparatus includes an image sensing circuit, an inverting circuit for inverting a polarity of an output of the image sensing circuit, and a correcting circuit for correcting a black reference level of the output of the image sensing circu... | 06/13/1995 |
| 5416533 | Apparatus for correcting a black level of a video signal A pedestal clamping device clamps a pedestal level of an input video signal in response to a predetermined pedestal voltage, and converts the input video signal into a clamped video signal. A black-level expanding device expands a tone of a black portion ... | 05/16/1995 |
| 5410365 | Video camera with coarse analog and fine digital black level adjustment In an image pick up device, signal level of red, green and blue color signals is coarsely adjusted in a signal processing circuit, and then a black level of video signal is finely adjusted in a digital signal processing circuit, thereby being capable of e... | 04/25/1995 |
| 5371552 | Clamping circuit with offset compensation for analog-to-digital converters A clamp circuit including a clamping capacitor and a differential amplifier charge and discharge the clamping capacitor in accordance with the magnitude of difference signals applied to the differential amplifier's inverting and non-inverting inputs. The ... | 12/06/1994 |
| 5361101 | Preamplifier for multimedia display An RGB preamplifier for a video display includes respective multipliers independently operable for adjusting the contrast of input primary and secondary video signals. The contrast adjusted video signals are added to form a combined display signal, the co... | 11/01/1994 |
| 5333019 | Method of adjusting white balance of CRT display, apparatus for same, and television receiver A method and apparatus for adjustment of the white balance of a CRT display system enabling white balance adjustment to be performed in a short time and a television receiver using the same. The white balance adjustment apparatus has a level adjustment ci... | 07/26/1994 |
| 5325187 | Image processing apparatus with back porch period sampling and clamping An image processing apparatus adds a plurality of input digital chroma image data and input digital luminance image data during a back porch of the input image data and outputs average value data. A subtractor subtracts the average value data, from the in... | 06/28/1994 |
| 5319450 | Circuitry for cancelling offsets of multiplexed color video signals Offset cancelling circuitry for cancelling offsets among the reference levels of a plurality of video signals each being associated with a particular color. The video signals are each applied to a particular differential amplifier. A multiplexer and a sam... | 06/07/1994 |
| 5291276 | Apparatus for processing a video signal to generate video signal adjustment data that is self-contained with the video equipment Apparatus that is self-contained with video equipment, such as a video camera or video record/playback device, and which generates video signal adjustment data for use by video signal processing circuits that are included in such video equipment. An input... | 03/01/1994 |
| 5287175 | Method and apparatus for negative-to-positive video conversion A system is disclosed for electronically processing negative composite video signals, wherein the negative composite video signals correspond to a negative image as produced by the projection of negative photographic film. The negative composite video sig... | 02/15/1994 |
| 5272522 | Video signal processing circuits Video signal processing circuit including a source of composite luminance signals having image-representative components separated by regularly recurring synchronizing signal components; keyed clamp and signal clipping circuit coupled to the luminance sig... | 12/21/1993 |
| 5255080 | Contrast corrector for video signal For a video apparatus such as a television receiver, a gray level correcting device is provided to correct luminance and color saturation of a video signal, thereby making the reproduced image clear and vivid. In this device, at least one of the differenc... | 10/19/1993 |
| 5245415 | Chroma encoder A chroma encoder inputs an analog color-difference signal and outputs an appropriate chroma signal, and includes an A/D converter for converting the analog color-difference signal into a digital color-difference signal, and a calculator for sampling the p... | 09/14/1993 |
| 5200833 | Signal level clamping apparatus for a CTDM video signal A signal level clamping apparatus for a CTDM video signal used for a time-base correction apparatus has a clamping circuit supplied with a reproduced color difference signal wherein, between adjacent two horizontal sync. signals, a first and second time-c... | 04/06/1993 |
| 5142643 | Sampled video signal generating device for improving deviation based on difference of circuit characteristics among channels An improved video signal processing circuit (63) in the high quality television system for alternating-current driving a liquid crystal module (64) is disclosed. A reference signal is inserted into vertical blanking periods of a R signal by a reference si... | 08/25/1992 |
| 5126831 | Clamping circuit In the clamping circuit, errors in direct current components contained in R, G and B signals from a matrix circuit are detected by comparing circuits and these errors are fed back to respective input capacitors through a reverse matrix circuit. The respec... | 06/30/1992 |
| 5113439 | CATV terminal and video apparatus having a noise eliminating circuit In a CATV terminal or a video apparatus such as a TV receiver, noises superimposed on a DC part of a horizontal synchronizing signal of a video signal are eliminated by integrating the DC part or replacing the DC part with an appropriate constant voltage.... | 05/12/1992 |
