摘要:
Determining a phase shift compensation for automatically centering an image by measuring a start time delay between a horizontal scan line signal and an active video signal, measuring an end time delay between the active video signal and the horizontal scan line signal, and computing a phase shift for a horizontal flyback signal using the start time delay and the end time delay. A system to center an image on a monitor includes a video processing circuit and a rasterizer. The video processing circuit receives a video signal and measures a start time delay and an end time delay between a horizontal scan line signal and an active video signal. The circuit generates a phase shift used to generate a horizontal flyback signal using the measured start time delay and the end time delay. The rasterizer receives the output of the video processing circuit to control a scanning element.
摘要:
The present invention is a method and apparatus for selecting a capacitor value corresponding to a horizontal frequency in a video monitor. The technique determines the horizontal frequency and creates a limit on a default capacitor value which is obtained from the determined horizontal frequency. An updated value is compared with the limit to generate a comparison result. The capacitor value between the default capacitor value and the updated value is selected based on the comparison result.
摘要:
In a display monitor, a horizontal synchronization signal having a horizontal scanning frequency is received by a first circuit. A vertical synchronization signal having a vertical scanning frequency is received by a second circuit. A moire correction signal that is proportional to a horizontal resolution of the displayed image is generated by dividing the horizontal scanning frequency by the vertical scanning frequency.
摘要翻译:在显示监视器中,具有水平扫描频率的水平同步信号由第一电路接收。 具有垂直扫描频率的垂直同步信号由第二电路接收。 通过将水平扫描频率除以垂直扫描频率来产生与显示图像的水平分辨率成正比的莫尔+ E,acu e + EE校正信号。
摘要:
An apparatus and method for providing image correction for a multifrequency display system. The apparatus comprises a circuit that generates a first signal based on a correction signal, a horizontal synchronization signal and a vertical synchronization signal. The apparatus also comprises a deflection circuit that generates a deflection signal based on the first signal and the vertical synchronization signal. The deflection circuit is operable within a range of frequencies. A video processing circuit coupled to the deflection circuit, and receives a video input signal and the deflection signal. The video processing circuit generates an output video signal based on the deflection signal and the video input signal.
摘要:
A waveform correction system using inductance-controllable inductors suitable for use in the horizontal sweep circuits of televisions and computer displays includes a linearity correction coil (18) that is connected in parallel to the horizontal linearity coil (12) of the sweep circuit and used to selectively alter the inductance of the horizontal linearity coil (12) to correct for non-linearities in the horizontal sweep waveform. The linearity correction coil (18) has an input coil (20) cross-coupled to an output coil (22) through a core (24) with the output coil (22) connected in parallel with the horizontal linearity coil (12). The input coil (20) is connected between a control node (26) and circuit ground. A controller (28), in the form of a programmed microprocessor, PLA, or similar device, includes a memory (32) into which digital correction factors are stored as a function of the forward left-to-right scan position of the electron beam as it sweeps from the left side to the right side of the display screen. As the electron beam sweeps left to right, a control current through the input coil (20) of the linearity correction coil (18) effects waveform correction.
摘要:
The present invention relates to a beam current control system for detecting and controlling a beam current generated by a cathode ray tube. The system comprises a video processing circuit that receives a first signal, and which generates a second signal that includes a video signal and a synchronization signal, which is provided to the cathode ray tube. The cathode ray tube generates a beam current corresponding to the second signal, where the beam current has a video signal portion and a synchronization signal portion. A storage element coupled between the video processing circuit and the cathode ray tube clamps the second signal at a first predetermined level, and stores an electrical charge corresponding to the video signal portion of the beam current during a first time interval. A first circuit coupled at one end to the storage element, and at the other end, to the video processing circuit, is operable upon receipt of a control signal from the video processing circuit, corresponding to the synchronization signal during the first time interval, to facilitate discharge of the electrical charge into the first circuit. The first circuit generates a third signal representative of a magnitude of the electrical charge. A second circuit coupled to the first circuit is configured to provide an output signal to the video processing circuit, the output signal corresponding to a difference between the third signal and a second predetermined level, for adjusting the beam current during a following time interval.
摘要:
A moiré adjustment circuit receives a horizontal synchronization signal having a horizontal scanning frequency and a moiré adjustment signal substantially proportional to a horizontal spatial offset of alternate display lines on the display to correct the moiré effect. The moiré adjustment circuit generates a horizontal position signal having a first frequency proportional to the horizontal scanning frequency and a position value substantially proportional to the moiré adjustment signal and the horizontal scanning frequency. A horizontal position control circuit, coupled to the moiré adjustment circuit, generates a horizontal reference signal having a second frequency substantially equal to the horizontal scanning frequency and a reference phase that is shifted from a synchronization phase of the horizontal synchronization signal substantially in proportion to the horizontal position signal. A horizontal driver circuit, coupled to the horizontal position control circuit, generates a flyback pulse having a third frequency substantially equal to the horizontal scanning frequency and a flyback phase that is substantially equal to the reference phase. The flyback phase controls a horizontal position of lines on the display to correct the moiré effect.
摘要:
An image display apparatus has a reader/writer for a contactless IC card, which is disposed at a position adjacent to a display section of the image display apparatus.
摘要:
An apparatus and method for providing image correction for a multi-frequency display system. The apparatus comprises a circuit that generates a first signal based on a correct on signal, a horizontal synchronization signal and a vertical synchronization signal. The apparatus also comprises a deflection circuit that generates a deflection signal based on the first signal and the vertical synchronization signal. The deflection circuit is operable within a range of frequencies. A video processing circuit coupled to the deflection circuit, and receives a video input signal and the deflection signal. The video processing circuit generates an output video signal based on the deflection signal and the video input signal.