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| Number | Title | Issue Date |
| 8035738 | Apparatus and method of controlling black stretch An apparatus for controlling black stretch includes a black stretching unit, an offset adjusting unit and an output unit. The black stretching unit performs black stretch processing on a video signal less than or equal to the maximum value of a black stretch control... | 10/11/2011 |
| 7403233 | Video circuitry for controlling signal gain and reference black level A multi-channel video signal processing circuit with a bias control and respective video channel gain controls. The bias signal, which corresponds to a nominal video signal brightness level, is shared among the video channels which, in accordance with respective vid... | 07/22/2008 |
| 7286175 | Bias control circuitry for cathode ray tube beam currents Bias control circuitry and method for use in controlling one or more cathode ray tube (CRT) beam currents. ... | 10/23/2007 |
| 7286183 | Device for generating a video image sharpness improvement signal A device for producing a video image sharpness improvement signal (DOC21-DOC22), with black level clipping of an associated video signal, comprises a differential transconductance stage processing the video signal and whose bias currents (Imax) are dir... | 10/23/2007 |
| 7277136 | Adaptive bandwidth control in a kinescope amplifier A method for controlling dissipation in a video amplifier for a display signal. The method comprises the steps of setting a first current for establishing a first gain bandwidth product in the video amplifier. Generating a control signal in accordance with a slew ra... | 10/02/2007 |
| 7236203 | Video circuitry for controlling signal gain and reference black level An apparatus and method for controlling signal gain and reference black level of a video signal. Magnitudes of signal gain and reference voltage for a subject video signal are determined by a common digital control signal, while the reference voltage determines the ... | 06/26/2007 |
| 7227559 | Image displaying method, image displaying device, and contrast-adjusting circuit for use therewith A system provides an image displaying technique that provides stable high contrast even in an area having high brightness. Based on information about an average brightness level of a digital luminance signal, black-correction processing which decreases a brightness ... | 06/05/2007 |
| 7187414 | Circuit for stabilizing high tension voltage of CRT, and method thereof Disclosed is a circuit for stabilizing a high tension voltage of a CRT and a method thereof. A feedback unit receives a cutoff voltage from the CRT. A compensating unit calculates a variation quantity of the cutoff voltage on the basis of the cutoff voltage from the... | 03/06/2007 |
| 7184097 | On-screen display apparatus The present invention provides an on-screen display apparatus which can eliminate variations in the DC level at a time when an input chroma signal and an OSD chroma signal are switched, and prevent an erroneous display of color. The on-screen display apparatus of th... | 02/27/2007 |
| 7075590 | Apparatus for providing television receiver alignment functions A method and apparatus within a television receiver for electronically aligning signals within the receiver by controlling support circuitry for an IF module. A control voltage source controls both video alignment and picture IF (PIF) mute functions. The DAC is coup... | 07/11/2006 |
| 7027098 | Picture-signal processing apparatus and method using weighting for black-level control A digitized luminance signal, representing the luminance component of a picture signal, is adjusted according to data stored in a memory. The data are output according to the value of the digitized luminance signal and multiplied by a weighting signal generated acco... | 04/11/2006 |
| 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 |
| 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 |
| 6947060 | Image forming apparatus, electron beam apparatus, modulation circuit, and image-forming apparatus driving method An image forming apparatus which performs pulsewidth modulation with a pulsewidth set by counting a clock. Especially, for grayscale level correction by setting the frequency of the clock, the periodic clock is counted, and an output pattern is changed in accordance... | 09/20/2005 |
| 6937287 | Video processing apparatus and method In order to reduce the total capacity of a ROM used for adjustment of the black level and the white level of a digitized luminance signal for a television receiver, for example, a comparator compares the input luminance signal with a predetermined threshold value, a... | 08/30/2005 |
| 6937288 | Beam current limiting circuit for use in a video projector In a beam current limiting circuit for a video projector, an average current is limited under closed loop control containing an anode current detection circuit 5. On the other hand, a cathode current detection circuit 107 comprises a first resistor and... | 08/30/2005 |
| 6900830 | CRT display device with improved resistance to spot bun A CRT display device includes an on-screen display circuit for producing a display signal displayed on-screen on a CRT and superposing said produced display signal on a video signal; a brightness restraining circuit for suppressing the brightness of CRT in a range b... | 05/31/2005 |
| 6897901 | Circuit for combining AKB and selective beam current limiting and projection television system utilizing same A control circuit for use in a video processor utilizes combined automatic kinescope bias (AKB) control, and average individual beam current sensing and limiting in at least one CRT. The control circuit includes automatic kinescope bias (AKB) control circuitry for d... | 05/24/2005 |
| 6897900 | Display apparatus comprising a cathode ray tube (CRT) A display apparatus, for instance a television receiver, comprises a cathode ray tube, a first circuit for providing a high voltage to the cathode and a second circuit receiving a gross signal and providing on at least an output at least a luminance signal controlli... | 05/24/2005 |
| 6888575 | Digital cut-off control loop for TV using speeding and blanking circuits An improved digital cut-off control loop for black level adjustment in a video processor for controlling RGB output signals. The improved circuit advantageously provides a higher resolution of the black level adjustment, and a short cut-off convergence time when the... | 05/03/2005 |
| 6870576 | Automatic beam limiter circuit An automatic beam limiter circuit (ABL circuit) calculating an average of a video signal at least a portion of the video signal is provided. After a converter circuit converts an analog signal, which is generated from the video signal, to a digital signal, a horizon... | 03/22/2005 |
| 6686710 | Circuit and method for regulating current using autobias A circuit for regulating a signal, such as a cathode current. The circuit has an input stage for inputting a signal and for producing a sense signal based thereon. The circuit may input timing signals and have a first stage for comparing a first reference... | 02/03/2004 |
| 6563496 | Cut-off adjusting apparatus A cut-off adjusting apparatus in which a signal source for detecting cathode current is not required, the cost can be reduced, the cathode current can be detected with high precision, and the correction corresponding to time-variation can be performed wit... | 05/13/2003 |
| 6563276 | CRT display apparatus A CRT display apparatus capable of displaying images in high contrast and high brightness without causing noises and halftone-reproduction degradation within dark areas is disclosed. The apparatus includes a circuit for generating an R-control signal, a G... | 05/13/2003 |
| 6556254 | Black and white level stabilization In a black and white level stabilization device, an OSD signal generator (OSD-SG) generates black and white reference signals (OSD-R/G/B), amplifying circuits (VA-R/G/B) amplify the black and white reference signals (OSD-R/G/B) or RGB signals (Ri, Gi, Bi)... | 04/29/2003 |
| 6549246 | Method for driving projection cathode ray tube In a projection CRT, an image of high brightness is displayed on a screen as an electron beam emitted from an electron gun is scanned according to an image driving signal. The image is magnified and projected through a lens unit. Here, voltage of a direct... | 04/15/2003 |
| 6541927 | Color cathode ray tube and adjusting method The format of a color video signal that has been inputted into a CPU from a video amplifying circuit is identified, and based on a given parameter variable according to this identified format, a second grid electrode voltage and the cathode bias voltages ... | 04/01/2003 |
| 6433827 | Measurement-free G2 calibration of color picture tubes A method for calibrating a screen grid voltage of the color picture tube in a color television set having automatic cut-off regulation. The method comprises the steps of, changing a normal operating potential at control electrodes of the color picture tub... | 08/13/2002 |
| 6369527 | Vertical blanking circuit and bias clamp boost supply A vertical blanking amplifier and bias clamp boost supply in accordance with the present invention uses the amplified vertical blanking signal to generate the boosted high voltage needed for powering the bias clamp circuits. A latch circuit is used to eff... | 04/09/2002 |
| 6313878 | Method and structure for providing an automatic hardware-implemented screen-saver function to a display product A hardware-implemented screen-saver prevents burn-in of an image displayed on a screen of a display product by automatically reducing the video gain, and therefore the contrast, of the image when the portion of the image within a two-dimensional detection... | 11/06/2001 |
| 6288690 | Video control circuit for a video display device A video control circuit controls the gains for red(R), green(G), and blue(B) color video signals inputted to a monitor, the brightness and contrast of a video display on the monitor, and the bias of a cathode ray tube within the monitor. A microcomputer o... | 09/11/2001 |
| 6288503 | Compensation of picture tube ageing effects At the onset of ageing or in the further course of their service life, color picture tubes relatively frequently exhibit a rise in the field strength between the cathode (K) and the Wehnelt electrode (G1) of the respective beam system on accoun... | 09/11/2001 |
| 6285401 | Apparatus for suppressing overshoots in kinescope beam current measurement pulses Display apparatus includes a kinescope cathode current sensor (18) coupled to a load (200) for developing a beam current measurement pulse during a beam current measurement interval. Overshoots in the pulses are suppressed by a pulse correction circuit (3... | 09/04/2001 |
| 6226037 | AKB interface circuit for kine driver IC An AKB interface apparatus in a display system (10), includes a video signal processing IC (12) having outputs coupled via respective kinescope driver ICs (18,20,22) to respective kinescope cathodes (K1,K2,K3) for display of a color image, the signal proc... | 05/01/2001 |
| 6211908 | Television apparatus with supplementary kinescope blanking and spot burn protection circuitry Supplementary grid blanking and spot burn protection are provided in a receiver/monitor (10) by a grid bias control circuit (50) including a blanking signal generator (60) that produces a blanking output signal (S1) devoid of any picture representative co... | 04/03/2001 |
| 6211629 | Cut-off level setting The cut-off level (Vcod) of a drive signal (Vd) of a cathode ray tube (3) is (Ib1, Ib2) occurring at these two levels (Vd1, Vd2).... | 04/03/2001 |
| 6097445 | White balance self-adjusting apparatus for use in color display A color display with a white balance self-adjusting function, including a DC-voltage-level/gain adjusting circuit for adjusting, on the basis of adjustment data, the DC voltage level and the gain of each of R, G and B primary color signals, thereby output... | 08/01/2000 |
| 6069660 | Automatic black level stabilizing apparatus An apparatus for automatically stabilizing the black level of a displayed picture when (1) an automatic black level stabilizing function is OFF, (2) black level error occurs between at an ON state and at an OFF state and (3) black level variation and pict... | 05/30/2000 |
| 5994841 | Circuit for biasing display device by compensating for a varying leakage current A circuit apparatus and method is disclosed for determining the actual beam current of a display device having at least one cathode and that actual beam current is used to both correctly bias a voltage that drives the display device and determine the actu... | 11/30/1999 |
| 5969762 | Video signal driver including a cascode transistor A kinescope video driver includes a series connection of a main cascode transistor coupled to a cathode of a cathode ray tube and a video signal amplifying transistor. A second cascode transistor is coupled between the main cascode transistor and the vide... | 10/19/1999 |
