摘要:
Method for adjusting one or more projectors, each projector generating a number of light beams of different color, characterized in that the projected picture (9-9A) is automatically adjusted during normal use of the projector (1-1A).
摘要:
In a CRT display apparatus, a horizontal distortion correction apparatus is provided for correcting horizontal distortion of an image by applying a residual phase to control the phase of a horizontal deflection current. The horizontal distortion correction apparatus corrects horizontal distortion of an image caused by an assembly error of the CRT display apparatus for displaying an image by scanning a video signal, based on a horizontal synchronizing signal included in the video signal. The horizontal distortion correction apparatus includes a PLL supplying the horizontal deflection current to a video signal controller for displaying an image on the CRT. A distortion-correcting waveform generator is operated by the user, applying a wave signal having a desired waveform to the PLL to provide a residual phase for the horizontal deflection current to control the phase thereof. As a result, the image without horizontal distortion is displayed on the CRT display apparatus.
摘要:
Where a stack projection operation is carried out using first and second projection display units, it is arranged such that the first projection display unit projects a crosshatch pattern continuously in time while on the other hand, the second projection display unit projects a pattern identical with that crosshatch pattern such that the pattern flashes at given intervals of time. Thereafter, the state of superposition between the patterns projected from the two projection display units is examined to carry out inter-set convergence adjustment between the display units.
摘要:
A horizontal display size compensation circuit for a monitor prevents a horizontal display size of a monitor screen from being changed when a horizontal frequency varies according to a video mode. A horizontal frequency is generated by a horizontal frequency generation section corresponding to each video mode. A microcomputer generates a predetermined horizontal display size compensation signal according to the horizontal frequency corresponding to each video mode and a horizontal display size adjustment signal corresponding to an input of a key input section, and a horizontal display size control section controls a horizontal display size of the monitor screen by supplying the horizontal display size adjustment signal of the microcomputer and the horizontal display size compensation signal to the horizontal frequency. Therefore, a horizontal display size of a monitor screen is prevented from varying according to a video mode.
摘要:
An apparatus and method for analyzing the brightness characteristics of a projected image and using the analyzed characteristics to improve the appearance of the projected image is disclosed. In one embodiment of the invention, the brightness characteristics of the projected image are analyzed at selected points across the raster of the image. An analysis array or array of data elements including brightness components corresponding to detail elements is then generated. The data elements in the array are then used to create compensation signals that are applied to the projected image through, for example, an overlay of smoothing factors or generation of a smoothing curve, to enhance the quality or appearance of the image by improving the regularity of brightness in all areas of the image. This regularity of brightness across the full span of the image is useful as a general improvement to the image and as a compensation for projector or projection surface brightness anomalies. In arrayed projection applications, central hot spotting, edge vignetting, electron beam or light source misalignments all can detract from evenly displayed images and all can benefit from the application of compensation that depends on an analysis array of the projected image.
摘要:
A focus compensation apparatus and method for a monitor system are provided. The focus compensation apparatus includes a parabolic signal generation circuit for generating a parabolic signal in synchronization with a horizontal flyback pulse, the waveform of the parabolic signal varying in response to first and second control signals. A video signal focus compensator adjusts the gain of an input video signal such that the gain increases from the center of the monitor screen toward the edge of the monitor screen in response to the parabolic signal. The focus compensator outputs a gain-adjusted video signal as a focus-compensated video signal. According to the focus compensation apparatus, the gain of an input video signal is adjusted using a parabolic signal, the level of which increases from the center of a monitor screen toward the edge of the monitor screen, thereby preventing a picture from being out of focus and blurred at the edge of the monitor screen. In addition, the waveform of the parabolic signal is automatically varied by a parabolic signal generation circuit while the gain of the input video signal is being adjusted to adjust contrast or auxiliary contrast, thereby effectively performing focus compensation at the edge of the monitor screen.
摘要:
There is provided a convergence adjusting apparatus and method using spline interpolation in a projection image display device. In the convergence adjusting apparatus, a controller calculates the unknown coefficients of a cubic spline interpolation polynomial for each line segment separated by adjustment points on a horizontal or vertical line to interpolate between the adjustment points, a memory temporarily stores the unknown coefficients, a coordinate position generator counts horizontal sync signal pulses and calculates the square and cube of the count value, a plurality of multipliers multiply the count value, the square, and the cube by the unknown coefficients received from the memory, respectively, and an adder adds convergence adjustment point data received from the memory and the outputs of the multipliers and outputs interpolation values.
摘要:
A projection type video display apparatus prevents resolution of a screen from decreasing by converting a video signal of an interlaced scanning mode received from an outside source to a video signal of a progressive scanning mode. A signal selecting section outputs one of a plurality of video signals received from the outside source in response to a control signal from a control section. A progressive scanning conversion section converts the video signal from the signal selecting section to a video signal of the progressive scanning mode in response to a control signal from the control section. When the video signal from the progressive scanning conversion section is amplified as a red-green-blue signal by means of a cathode-ray tube driving section, a progressive convergence section outputs a progressive convergence signal in order to minimize a difference between incidence angles of each of the red, green and blue components of the red-green-blue signal in response to a control signal from the control section. A cathode-ray tube outputs the red-green-blue signal from the cathode-ray tube driving section in response to the progressive convergence signal. A control section outputs control signals to the signal selecting section, progressive scanning conversion section and progressive convergence section, respectively. Accordingly, a decrease in the resolution of the video displayed on a screen is prevented.
摘要:
An image adjusting circuit of a display monitor includes a microcomputer for storing an image adjusting data, converting it to a d-c level, and generating a PWM pulse; and an integrating circuit, receptive to the PWM pulse according to the image adjusting data generated from the microcomputer, for integrating the PWM pulse according to the period of a vertical retrace pulse, and applying an image adjusting pulse to a horizontal size regulating terminal, thereby compensates for the pin/barrel-shaped and trapezoid distortions on the display monitor by integrating the PWM pulse generated from the microcomputer to generate a waveform through one integrating circuit, and by adjusting the image by regulating the PWM pulse.
摘要:
A semiwide-screen television receiver which can provide a horizontally extended picture on a screen. The receiver receives and displays on a cathode ray tube (CRT) an image signal having a 12:9 screen aspect ratio (AR), and includes a cathode ray tube having a horizontal dimension which is larger than that of a conventional CRT having a 4:3 screen aspect ratio. A deflection unit including an inductance variation device for adjusting the inductance value of a horizontal deflection coil is provided, so as to minimize an inductance dispersion of the deflection unit.