公开(公告)号：US20040066388A1

公开(公告)日：2004-04-08

申请号：US10619914

申请日：2003-07-15

发明人： Mark M. Leather ,  Gordon M. Elder

IPC分类号： G09G005/00

CPC分类号： H04N9/645 ,  G06T5/009 ,  G06T11/001 ,  G09G1/285 ,  G09G5/02 ,  G09G5/06 ,  G09G2320/0276 ,  G09G2320/0673

摘要： The present invention provides a solution to the problems of performing transformation functions on data originating in gamma space and part of systems that do not use, or are not intended to use, gamma correction schemes. The invention provides additional stages to a transform block used by a transform function. In the scheme of the invention, each input sample has a degamma function (inverse gamma) applied to it to transform it from gamma space to linear space, prior to the transform block. The degamma function is such as to approximate the transfer function of a typical monitor. After the transform operation is applied at the transform block to produce a result, a gamma function is applied to the result to return the sample to gamma space so that the output sample is ready for further processing.

摘要翻译： 本发明提供了一种解决方案，用于对始发于伽马空间的数据和部分不使用或不用于伽马校正方案的系统进行转换功能。 本发明提供了由变换函数使用的变换块的附加阶段。 在本发明的方案中，在变换块之前，每个输入样本具有应用于其的反伽马函数（反伽马）以将其从伽马空间转换成线性空间。 反射功能是近似于典型显示器的传递函数。 在变换块上应用变换操作以产生结果之后，将γ函数应用于结果以将样本返回到伽马空间，使得输出样本准备好进行进一步处理。

公开(公告)号：US20030038898A1

公开(公告)日：2003-02-27

申请号：US10225120

申请日：2002-08-22

申请人： MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.

发明人： Yutaka Otani ,  Masahiko Sasada ,  Nobuo Taketani ,  Masahiro Takeshima ,  Hiroshi Moribe

IPC分类号： G09G001/14 ,  H04N003/22 ,  H04N003/26 ,  H04N009/16

CPC分类号： H04N9/645 ,  H04N9/72

摘要： 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 red (R), green (G) and blue (B) at different timings within a single vertical blanking interval, and outputs latch timing signals respectively indicating the timings. The cut-off control circuit shifts a level of each primary-color signal having the cut-off reference pulse added thereto based on a corresponding cut-off control signal. The drive circuit drives each cathode of a CRT (cathode-ray tube) based on a corresponding one of the shifted primary-color signals, and outputs a voltage corresponding to each cathode current as a common feedback signal. The level control section latches the feedback signal in response to each latch timing signal, and outputs the cut-off control signal of one of the primary-color signals.

摘要翻译： 自动切断系统包括视频数据处理电路，截止控制电路，驱动电路和电平控制部分。 视频数据处理电路在单个垂直消隐间隔内的不同定时将具有预定电平的截止参考脉冲与红（R），绿（G）和蓝（B）的原色信号相加，并输出锁定定时 信号分别表示时间。 截止控制电路基于对应的截止控制信号，移动其中附加有截止参考脉冲的每个原色信号的电平。 驱动电路基于相应的一个移位的原色信号驱动CRT（阴极射线管）的每个阴极，并且输出与每个阴极电流相对应的电压作为公共反馈信号。 电平控制部分响应于每个锁存定时信号锁存反馈信号，并输出一个原色信号的截止控制信号。

公开(公告)号：US20030001526A1

公开(公告)日：2003-01-02

申请号：US09989418

申请日：2001-11-21

发明人： Akinori Heishi ,  Hironobu Yasui ,  Tetsuya Shimizu

IPC分类号： G09G001/28

CPC分类号： G09G1/28 ,  H04N9/645

摘要： 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-control signal and a B-control signal by removing, from each of the R-, G- and B-video signals, portions which are below a predetermined level in amplitude, an amplification circuit for inverting and amplifying the R-, G- and B-control signals, and a selection circuit for selecting, for each of the three G1 electrodes, either a corresponding one of the R-, G- and B-control signals inverted and amplified by the amplification circuit or a potential of a predetermined value in accordance with an instruction from an outside, and applying each of the three G1 electrodes with a selected one of the corresponding one of the R-, G- and B-control signals and the potential.

公开(公告)号：US06188435B1

公开(公告)日：2001-02-13

申请号：US09034698

申请日：1998-03-04

申请人： Hossein Ahmari ,  Gerard Rilly

发明人： Hossein Ahmari ,  Gerard Rilly

IPC分类号： H04N568

CPC分类号： H04N9/645

摘要： 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 comparator/integrator which compares a sum of these current pictures with a beam current information item for the purpose of controlling the R, G, B beam currents and/or the picture sharpness. Gamma correction is carried out in the circuit. The circuit may be of analog or digital construction and may advantageously be integrated in a video processor IC. The present circuit is particularly applicable for television sets or computer monitors.

摘要翻译： 用于控制显像管中的光束电流的电路，该电路计算显像管中的R，G，B束电流的当前图像，其大体上对应于彩色显像管中的实际光束电流。 该电路包括比较器/积分器，用于将这些当前图像的和与波束电流信息项进行比较，以便控制R，G，B波束电流和/或图像清晰度。 伽马校正在电路中进行。 电路可以是模拟或数字结构，并且可以有利地集成在视频处理器IC中。 本电路特别适用于电视机或电脑显示器。

公开(公告)号：US5821917A

公开(公告)日：1998-10-13

申请号：US504433

申请日：1995-07-20

申请人： Richard D. Cappels

发明人： Richard D. Cappels

IPC分类号： H04N9/64 ,  H04N9/73 ,  H04N17/04 ,  G09G5/02

CPC分类号： H04N17/04 ,  H04N9/645 ,  H04N9/73 ,  G09G2320/043

摘要： A system and method of compensating for the effects of aging of phosphors and faceplate upon color accuracy in cathode ray tubes, wherein beam current measurements are made upon individual cathodes of a cathode ray tube to sample the individual beam currents at periodic intervals. The sum-totals of the individual beam current measurements are then stored in a non-volatile memory location. Correction factors are calculated for both luminous efficiency degradation and for deviations in hue, based on the stored sum-total beam current measurements in combination with empirically-derived formulae. These correction factors are then used to calculate corrected tristimulus values X, Y, and Z. The corrected tristimulus values are used to calculate the amount of beam current necessary to compensate for color degradation of the cathode ray tube. Finally, the respective gains of the video amplifiers are adjusted to achieve the amount of beam current necessary to compensate for the effects of aging of the cathode ray tube.

摘要翻译： 补偿荧光体和面板的老化对阴极射线管的颜色精度的影响的系统和方法，其中对阴极射线管的各个阴极进行射束电流测量，以周期性间隔对各个束电流进行采样。 然后将各个电流电流测量的总和存储在非易失性存储器位置。 基于存储的总光束电流测量结合经验派生公式计算校正因子，用于发光效率退化和色相偏差。 然后将这些校正因子用于计算校正的三刺激值X，Y和Z.校正的三刺激值用于计算补偿阴极射线管的颜色劣化所需的束电流量。 最后，调整视频放大器的相应增益以实现补偿阴极射线管老化的影响所需的束电流量。

公开(公告)号：US4705992A

公开(公告)日：1987-11-10

申请号：US800455

申请日：1985-11-21

申请人： Dan N. Ciocan

发明人： Dan N. Ciocan

IPC分类号： H01J1/13 ,  H04N9/64 ,  H01J29/52

CPC分类号： H01J1/135 ,  H04N9/645

摘要： A system for stabilizing the cathode emissions of an in-line gun cathode ray tube includes subsystems functionally identical to one another linked to each of the cathodes of an in-line gun cathode ray tube. During the time that the CRT beam is retracing vertically, each subsystem imposes a fixed, predetermined voltage on a cathode in the cathode ray tube, samples the current flowing to the cathode, compares the sampled current to a predetermined, desired reference current for the cathode, develops a differential signal representing the difference, if any, between the sampled current and the reference current, and then drives the current flowing to the cathode from its actual value to its predetermined, reference value so as to maintain a predetermined, desired ratio of the currents flowing to each of the cathodes.

摘要翻译： 用于稳定串联枪阴极射线管的阴极发射的系统包括在线枪式阴极射线管的每个阴极彼此功能相同的子系统。 在CRT光束垂直回溯的时间期间，每个子系统在阴极射线管的阴极上施加固定的预定电压，对流向阴极的电流进行采样，将采样的电流与预定的阴极参考电流进行比较 ，形成表示采样电流和参考电流之间的差值（如果有的话）的差分信号，然后将流过阴极的电流从其实际值驱动到其预定的参考值，以保持预定的期望比例 流向每个阴极的电流。

公开(公告)号：US4633320A

公开(公告)日：1986-12-30

申请号：US587583

申请日：1984-03-08

申请人： Donald H. Willis

发明人： Donald H. Willis

IPC分类号： H04N5/59 ,  H04N5/16 ,  H04N9/64 ,  H04N5/68 ,  H04N9/16

CPC分类号： H04N5/165 ,  H04N9/645

摘要： In a digital video signal processing system including an image reproducing kinescope and a digital-to-analog converter (DAC), excessive kinescope beam current are automatically limited in response to a control signal which varies a reference voltage for the DAC such that the peak-to-peak amplitude of analog video signals from the DAC is reduced. A version of the control signal is applied to the output of the DAC with a magnitude and polarity for substantially negating unwanted shifts of the video signal black level during the beam current limiting mode.

摘要翻译： 在包括图像再现显像管和数模转换器（DAC）的数字视频信号处理系统中，响应于改变DAC的参考电压的控制信号自动地限制过大的显像管束电流， 来自DAC的模拟视频信号的峰值幅度减小。 控制信号的一个版本被施加到具有幅度和极性的DAC的输出端，用于在束流限制模式期间基本上消除视频信号黑电平的不期望的移位。

公开(公告)号：US4599643A

公开(公告)日：1986-07-08

申请号：US566904

申请日：1983-12-29

申请人： Wayne E. Harlan

发明人： Wayne E. Harlan

IPC分类号： H04N5/59 ,  H04N9/18 ,  H04N9/64 ,  H04N9/68 ,  H04N9/20 ,  H04N9/16

CPC分类号： H04N9/645

摘要： Excessive peak beam currents conducted by a kinescope in a color television receiver are limited by apparatus which compares the combined instantaneous magnitudes of plural color signals with a fixed threshold and, if exceeding the threshold, the combined signal is detected. The detected signal is used to limit the magnitudes of the color signals, thereby limiting excessive kinescope beam currents otherwise developed in response to the color signals. The apparatus is used in the receiver together with a more conventional automatic kinescope beam current limiter of the type which operates in conjunction with a kinescope resupply current source.

摘要翻译： 由彩色电视接收机中的显像管传导的过大的峰值束电流受到将多个彩色信号的组合瞬时幅度与固定阈值进行比较的装置的限制，并且如果超过阈值，则检测到组合信号。 所检测的信号用于限制彩色信号的大小，从而限制响应颜色信号而另外显影的过度的显像管光束电流。 该装置与更传统的自动显像管光束限流器一起用于接收器中，该限幅器与显像管补给电流源一起工作。

公开(公告)号：US2862052A

公开(公告)日：1958-11-25

申请号：US52408955

申请日：1955-07-25

申请人： RCA CORP

发明人： SERIGHT CARL G

IPC分类号： H04N3/20 ,  H04N5/57 ,  H04N9/64

CPC分类号： H04N3/20 ,  H04N5/57 ,  H04N9/645

公开(公告)号：US06897901B2

公开(公告)日：2005-05-24

申请号：US10022172

申请日：2001-12-13

申请人： William G. Miller

发明人： William G. Miller

IPC分类号： H04N5/59 ,  G09G1/28 ,  H04N5/68 ,  H04N5/74 ,  H04N9/31 ,  H04N9/64 ,  H04N5/16

CPC分类号： H04N5/74 ,  H04N5/59 ,  H04N5/68 ,  H04N9/645

摘要： 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 detecting a magnitude of individual red (R), green (G) and blue (B) cathode currents driving corresponding R, G and B CRTs, generating R, G and B average cathode current control signals therefrom, and using the R, G and B average cathode current control signals as feedback to the video processor to reduce the R, G and B cathode currents approximately equal current amounts. Selective beam current limiting circuitry within the control circuitry compares at least one of the R, G and B average current control signals with a predetermined signal, and whereupon the at least one of the R, G and B average current control signals exceeds the predetermined signal, introducing a gain reduction in corresponding video gain stages within the video processor to limit the at least one of the R, G and B average current control signals.

摘要翻译： 在视频处理器中使用的控制电路利用组合的自动显像管偏置（AKB）控制和在至少一个CRT中的平均单独的光束电流感测和限制。 控制电路包括自动显象管偏置（AKB）控制电路，用于检测驱动相应的R，G和B CRT的各个红色（R），绿色（G）和蓝色（B）阴极电流的大小，产生R，G和B平均值 阴极电流控制信号，并且使用R，G和B平均阴极电流控制信号作为对视频处理器的反馈，以将R，G和B阴极电流大致相等于电流量。 控制电路内的选择性电流限制电路将R，G和B平均电流控制信号中的至少一个与预定信号进行比较，于是R，G和B平均电流控制信号中的至少一个超过预定信号 引入视频处理器内对应视频增益级的增益减小以限制R，G和B平均电流控制信号中的至少一个。