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...When G.G. Hubbard learned of his future son-in-law's invention, he called it "only a toy." His daughter was engaged to a young man named Alexander Graham Bell.
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| Number | Title | Issue Date |
| 7271828 | Display screen burn-in prevention device and burn-in prevention method A burn-in prevention image signal is generated by subjecting an input image signal to blurring and then to contrast inversion to invert the contrast of the signal luminance level. The burn-in prevention image signal is used when the input image is a still image that... | 09/18/2007 |
| 7245316 | Method and system for maintaining even tube burn-in An arrangement for maintaining even tube burn-in. The arrangement identifies active and inactive display regions on a display unit when video content is displayed on the display unit. When inactive display regions are identified the arrangement monitors the duration... | 07/17/2007 |
| 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 |
| 7162702 | Display device and method for driving the same A display device and a method for driving the same are disclosed. The display device confirms whether display data applied to a display panel are uniformly maintained for a predetermined time. As a result of confirmation, if the display data are uniformly maintained... | 01/09/2007 |
| 7123099 | Two-stage amplifier with series L-R coupling network A two-stage amplifier that includes a first stage and a second stage and a first component and a second component coupled in series between the first and second stages. The first component is selected to provide AC decoupling of the first and second stages and the s... | 10/17/2006 |
| 7102694 | Apparatus and method for eliminating afterimage state An apparatus and method for eliminating an afterimage state occurring on a liquid crystal display (LCD) panel. The apparatus includes a memory for storing an input video signal, a data comparator for comparing data read from or written into the memory, a controller ... | 09/05/2006 |
| 7038668 | Picture displaying apparatus, which does not require a calculating circuit, when the screen saver function is attained, and a method of driving the same A picture displaying apparatus that includes scanning lines to which scanning signals are inputted, data lines to which data signals are inputted, and a light emission element present at every intersection of scanning lines and data lines. The designated picture dis... | 05/02/2006 |
| 7030908 | Method and circuit for spot-killer control in cathode-ray tube Disclosed are a method and an apparatus for preventing appearance of a zigzag flush of light in a cathode-ray tube at the time of turning it off. A train of power-off control pulses are produced in synchronization with the vertical sweeping signal; a spot-killer con... | 04/18/2006 |
| 7002593 | Method for reducing the power used by emissive display devices A method for reducing the power used by a display device having light emitting pixels, includes the steps of: receiving formatted information for presentation on the display device; modifying the format of the formatted information to reduce the number and/or intens... | 02/21/2006 |
| 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 |
| 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 |
| 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 |
| 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 |
| 6847404 | Video display protection circuit An apparatus and a method for protecting a video display device, having an anode and a cathode, against excessive beam current conditions. In particular, the present invention protects the video display device against zero-biasing of the device, wherein the cathode ... | 01/25/2005 |
| 6744429 | Abnormal operation prevention circuit for display device and method for operating the same A display device includes a display unit with a plurality of pixels for displaying picture images, a driving unit for controlling operation of the respective pixels of the display unit, a power control unit for supplying a power to the driving unit and the display u... | 06/01/2004 |
| 6636265 | Focus flutter prevention in TV receivers and monitors An inventive method for preventing focus flutter display in a TV receiver or monitor includes the steps of amplifying a received signal for driving cathode elements of a cathode ray tube, and delaying initial full amplification of the signal during the am... | 10/21/2003 |
| 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 |
| 6563495 | Automatic screen saver A method and system for implementing a screen saver function is described. A peak value of a characteristic such as beam current magnitude of a video signal being processed is determined. An average value of the same characteristic of the video signal is ... | 05/13/2003 |
| 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 |
| 6545717 | Display system having selectable automatic CRT cutoff stabilization or AKB with CRT feedback current simulation A display system (10) which includes a CRT feedback current simulating circuit (20) to simulate the cathode feedback current directly from the from the red, green and blue output biases of the video processor (13). Furthermore, the display system (10) app... | 04/08/2003 |
| 6473078 | Method and device for power consumption management of an integrated display unit A method and a device for power management regarding an integrated display unit including a video display and at least one peripheral device, wherein the video display uses horizontal and vertical sync signals for the synchronization of the display images... | 10/29/2002 |
| 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 |
| 6392695 | Image display device An image display device having (a) a DVD or a CD, (b) a television receiver, (c) a display for displaying an image from the DVD and the television receiver, (d) a screen burn-in preventer, and (e) a deterioration protector for protecting the display devic... | 05/21/2002 |
| 6323915 | Method and apparatus to enhance a border area of a display A method and apparatus for displaying a video signal is described. A first video signal is received representing a first image having a first aspect ratio. The first image is displayed on a display having a second aspect ratio and a display area, with the... | 11/27/2001 |
| 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 |
| 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 |
| 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 |
| 6188435 | Circuit for controlling beam current in a picture tube A circuit for controlling beam current in a picture tube, which circuit calculates current pictures for the R, G, B beam currents in the picture tube, which largely correspond to real beam currents in the color picture tube. The circuit comprises a compar... | 02/13/2001 |
| 6091454 | Method and apparatus for displaying images having adjacent horizontal blocks with sharp contrast on a display unit of a television system A television system for displaying images having adjacent horizontal blocks with sharp contrast. In general, such sharp contrasts can cause the drive voltage (Hv) applied to an anode of a CRT display unit to change. The changes typically result in distort... | 07/18/2000 |
| 6064581 | High voltage transformer A high voltage transformer (Tr) includes a primary winding (Lp), secondary windings (Ls1, Ls2, Ls3), and diodes (Di) coupled between successive secondary windings. The polarity of the diodes and the secondary windings is selected such that the flyback vol... | 05/16/2000 |
| 6057883 | Circuit for controlling the picture tube in a television receiver A circuit for controlling the picture tube in a television receiver. In order to generate a high peak white on the screen of the picture tube, it is desirable to drive the output amplifiers at full output. Because of tolerances, for example in the cutoff ... | 05/02/2000 |
| 6034729 | Monitor protection system A monitor protection system comprise a display power management signaling (DPMS) operating unit for performing a predetermined power control; a horizontal deflection detecting circuit for detecting a horizontal deflection signal from a horizontal deflecti... | 03/07/2000 |
| 5889558 | Variable black level bias image display An image display is disclosed, in which a reference signal is superimposed on image signal in a fly-back period for controlling the bias voltage on the cathode of the CRT or the reference signal or the bias voltage on the grid G2 of the CRT such as to mak... | 03/30/1999 |
| 5883669 | Display device using electron beam and method of erasing display screen A device having a display device employing a cathode-ray tube and an electron beam includes an on-screen display memory for storing data used to display white on an entire screen of the cathode-ray tube, a circuit for supplying signals used to display whi... | 03/16/1999 |
| 5682083 | Spot removing circuit for a CRT with grid control means A spot removing circuit for a display device is disclosed. The spot removing circuit comprises a rectifying and smoothing portion for rectifying and smoothing the voltage outputted from a flyback transformer, a capacitor for charging a voltage supplied fr... | 10/28/1997 |
| 5677730 | Spot elimination circuit for a cathode ray tube An improved spot elimination circuit for preventing a spot from occurring on the screen of a cathode ray tube such as a monitor or television receiver at the instant that the deflection circuit is shut off. An input voltage is charged and discharged to su... | 10/14/1997 |
| 5671016 | High voltage discharge circuit for CRT In a high voltage discharge circuit for a CRT, a power-off detecting circuit detects turning off of a power switch and outputs a power-off detection signal, to activate a luminance increasing section to increase the luminance of a video signal being outpu... | 09/23/1997 |
| 5430596 | CRT protector circuit A CRT protector circuit for detecting an overcurrent or an overvoltage to a CRT to protect the CRT. A detector circuit is provided for detecting the overcurrent and the overvoltage, and when such is detected an abnormality detection output from the detect... | 07/04/1995 |
| 5394188 | High voltage stabilizing circuit for use in color television receivers An anode voltage (high voltage) of a CRT is detected by a voltage division. When it is detected by a comparator that the reduction of the high voltage has exceeded the controlled range of a high voltage stabilizing loop, two switches will be on. When one ... | 02/28/1995 |
