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公开(公告)号：US3943281A
公开(公告)日：1976-03-09
申请号：US412365
申请日：1974-03-08
IPC分类号： H04N3/28
CPC分类号： H04N3/28
摘要： A low bandwidth high brightness display system that utilizes a multiple beam cathode ray tube to write multiple rasters by concurrently scanning a plurality of lines with a selected number of beams. Each of the rasters covers a different portion of the screen so that the vertical deflection of the beam is reduced for each beam by a factor related to the number of beams. The system reduces the maximum data rate in writing speed relative to conventional arrangements with a resultant bandwidth reduction proportional to the number of beams. The concept is applicable to television viewing screens and field sequential color television to produce simultaneously a high resolution, high brightness and high quality display.FIELD OF THE INVENTIONThis invention generally relates to display systems and particularly to a high bandwidth television display system that operates with individual channels having a relatively small information bandwidth and with a high brightness by utilizing a multi-beam cathode ray tube to form a plurality of adjacent rasters in a first dimension that concurrently define the total display.DESCRIPTION OF THE PRIOR ARTTelevision type displays have been unable to develop a high resolution, high brightness and high quality display by using conventional scanning methods of either a single beam or even by using a multi-beam cathode ray tube.Multi-beam cathode ray tubes (CRT) are well known in the art and have been used for the generation of both color and black and white television displays. Examples of such multi-beam television displays may be found in the following U.S. Pat. Nos. 3,448,316; 3,596,126; 3,546,516; and 3,594,600, all assigned to a common assignee. For example, in 3,448,316 a lens system is used for eliminating optical errors such as spherical aberration and/or coma from the television display. The optical correction is accomplished by the use of a plurality of electron beams which are made to converge substantially at the optical center of a lens-like electrostatic focusing means which is common to all of the beams and focuses beams on to an electron receiving screen. This particular device generates a color diaplay of the sequential color dot type.Another example of display systems utilizing a multi-beam cathode ray tube may be found in Serial Number 327,896, now U.S. Pat. No. 3,821,796, "Improved Television Display System" which is assigned to the same assignee as this present application. That application discloses a multi-beam cathode ray tube used in conjunction with a field sequential color television system to produce a color display. The electron beams are in line and create a raster by sweeping the plurality of beams across the face of the display in a paintbrush-like fashion. The plurality of electron beams is then used to sweep another series of lines immediately below the previous trace. A transparent rotating color wheel, having the three primary colors -- red, green, and blue, is disposed in front of the display for creating the sense of color in the viewer's eye.The problem with most multi-beam cathode ray tubes is that they must generally be long in length from the viewing screen to the electron gun. The greater length for multi-beam cathode ray tubes is necessitated by the fact that the individual beams must be focused in close proximity to each other and the cathodes must be separated from each other because of the space that each individual cathode requires. Another drawback of most multi-beam CRTs is that generally a high bandwidth is required along with a high deflection rate in the Y-axis. If brightness is to be maintained at a high level a high bandwidth generally results in a poor resolution since brightness is dependent upon a high current beam and higher current results in beam spreading, therefore low resolution. A high current beam further requires higher power, more complex circuitry at greater cost and also reduced reliability.SUMMARY OF THE INVENTIONAccordingly, it is the object of the present invention to provide a high resolution, high brightness and high quality raster display.It is another object of the present invention to provide a raster display utilizing a plurality of electron beams having a low bandwidth.It is another object of the present invention to provide a raster display by a cathode ray tube being shorter in length than heretofore possible.It is yet another object of the present invention to provide a multi-beam CRT with a small beam deflection in the Y dimension.It is still another object of the present invention to provide a plurality of electron beams for simultaneously generating a plurality of rasters on a display.In accordance with the foregoing objects a raster display generation system utilizing a multiple beam CRT includes a display surface, a source for generating a plurality of electron beams and control means. A first electron beam traces a first raster encompassing a first vertical position in a first dimension on the display screen. A second electron beam traces a second raster immediately adjacent to the first raster in a first dimension. A third electron beam traces a third raster immediately adjacent to the second raster in the same dimension. A fourth electron beam traces a fourth raster immediately adjacent to the third raster. The plurality of rasters is created simultaneously by the plurality of electron beams. An individual line of a raster is generated by moving a beam across the face of the screen; the beam is then deflected downward in a second dimension to trace the next line in that raster. Each beam is controled to define an individual raster and the plurality of rasters are generated at the same time, on a line by line basis, by the individual beams.
摘要翻译： 一种低带宽高亮度显示系统，其利用多束阴极射线管通过同时扫描具有所选数量的光束的多条线来写入多个光栅。 每个光栅覆盖屏幕的不同部分，使得针对每个光束的光束的垂直偏转减少了与光束数量有关的因素。 该系统相对于常规布置降低了写入速度的最大数据速率，其结果是带宽减小与波束的数量成比例。 该概念适用于电视观看屏幕和现场顺序彩色电视，以同时产生高分辨率，高亮度和高质量的显示。
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公开(公告)号：US4158838A
公开(公告)日：1979-06-19
申请号：US869721
申请日：1978-01-16
CPC分类号： G09G5/20
摘要： A symbol smoothing system for synthetically increasing the effective resolution of an in-raster symbol generator memory by a factor of four. The system stores a special three bit code in selected memory elements representative of the existing and past two memory lines with the code actually being a video brightness distribution and positioning offset code. A code number in a single memory cell defines positional and intensity information for the display elements corresponding to that memory cell and to selected surrounding eight memory cells, all of the memory cells having time or positional correspondence to display element positions. The stored codes in the surrounding memory cells, as well as the instantaneous memory cell being decoded, provide intensity levels which are combined at selected display element positions. The video data input for each memory cell consists of the fractional X and Y position bit and symbol type bit and from each memory element, eight additional display elements are developed having selected brightness levels. By decoding this code bit information, the in-raster symbology provides a smooth transition from one display line to the next so as to eliminate the staircase effect in rotated or non-orthogonal lines. For each memory cell in a first field, such as the odd field, every other display resolution element is generated principally from the code in the memory cell and the alternate resolution element is generated principally from the same code. For the other field, such as the even field, the two elements on the display are generated principally from same information code in the memory cell. Further, each resolution element defined by a memory cell can have its intensity increased by codes stored in surrounding memory cells. The three bit memory codes define the location of the imaginary display elements and the video distribution patterns, which patterns simulate a gaussian brightness distribution to temper the edge sharpness of the digitally derived symbology. Thus by storing a single code for each selected memory cell, the system by proper decoding of the codes stored in that memory cell and the surrounding memory cells, develops both positional and intensity display information for the display elements while increasing the effective resolution of the in-raster symbol generator refresh memory by a factor of four. Another feature in accordance with the invention is the use of a common decoding structure by altering the stored codes with a bit rotator so as to be compatible with the common decoding structure, with the altered code representing the correct condition to be decoded.
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公开(公告)号：US4053946A
公开(公告)日：1977-10-11
申请号：US634711
申请日：1975-11-24
申请人： Eugene W. Opittek , James L. Heard , Bruce W. Keller , Michael D. Pruznick , Thomas A. Bosseler
发明人： Eugene W. Opittek , James L. Heard , Bruce W. Keller , Michael D. Pruznick , Thomas A. Bosseler
CPC分类号： G06K13/0825 , G01S7/298 , G06T1/0007
摘要： A digital scan converter which comprises modular video processing units and modular memory and output units is adapted for processing applied sensor data of various formats so as to provide output data suitable for display on a common indicator. Parameters for processing operations, such as analog-to-digital converting, integrating and detecting, are implemented by the video processing modules in response to digital "set-up" and address words applied from a programmed microprocessor controller. The storage and readout format of the memory and output modules is also controlled by "set-up" and address words applied from the programmed controller.
摘要翻译： 包括模块化视频处理单元和模块化存储器和输出单元的数字扫描转换器适于处理各种格式的应用传感器数据，以便提供适于在公共指示器上显示的输出数据。 响应于数字“设置”和从编程的微处理器控制器应用的地址字，视频处理模块实现诸如模数转换，集成和检测的处理操作的参数。 存储器和输出模块的存储和读出格式也通过“编程”和从编程的控制器应用的地址字进行控制。
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