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    ACTIVE MATRIX LIGHT EMITTING DIODE PICTURE ELEMENT STRUCTURE AND METHOD
    1.
    发明专利
    ACTIVE MATRIX LIGHT EMITTING DIODE PICTURE ELEMENT STRUCTURE AND METHOD 失效

    公开(公告)号：JPH11219146A

    公开(公告)日：1999-08-10

    申请号：JP31156998

    申请日：1998-09-28

    Applicant: MITSUBISHI CHEM CORP ,  SARNOFF CORP

    Inventor： KANE MICHAEL GILLIS ,  ATHERTON JAMES HAROLD ,  STEWART ROGER GREEN ,  CUOMO FRANK PAUL

    IPC: G09G3/14 ,  G09F9/00 ,  G09F9/33 ,  G09G3/30 ,  G09G3/32 ,  H01L33/00 ,  H01L51/50

    Abstract: PROBLEM TO BE SOLVED: To reduce uneveness of a current in a light emitting diode(LED) so as to improve uniformity of luminance by composing picture element structure of NMOS transistors, a capacitor and the LED. SOLUTION: Picture element structure 300 is composed of five NMOS transistors 310-350, a capacitor 302 and an LED 304. A selection line 370 is connected to a gate of the transistor 350, and a data line 360 is connected to one terminal of the capacitor 302. An auto-zero line 380 is connected to a gate of the transistor 340, and a VDD line 390 is connected to the drains of the transistors 320, 220. One terminal of the capacitor 302 is connected to the source of the transistor 330 and the drains of the transistors 340, 350, and the sources of the transistors 310, 320 are connected to one terminal of the LED 304. With this constitution, unevenness of a current can be reduced in the LED 304.

    A METHOD AND APPARATUS FOR CALIBRATING DISPLAY DEVICES AND AUTOMATICALLY COMPENSATING FOR LOSS IN THEIR EFFICIENCY OVER TIME
    3.
    发明申请
    A METHOD AND APPARATUS FOR CALIBRATING DISPLAY DEVICES AND AUTOMATICALLY COMPENSATING FOR LOSS IN THEIR EFFICIENCY OVER TIME 审中-公开
    一种用于校准显示设备的方法和装置，并且在时间上自动补偿其效率的损失

    公开(公告)号：WO0163587A2

    公开(公告)日：2001-08-30

    申请号：PCT/US0140169

    申请日：2001-02-22

    Applicant: SARNOFF CORP

    Inventor： SHEN ZILAN ,  MATTHIES DENNIS LEE ,  ATHERTON JAMES H ,  STEWART ROGER GREEN

    IPC: H01L51/50 ,  G09G3/20 ,  G09G3/30 ,  G09G3/32

    CPC classification number: G09G3/3208 ,  G09G2300/026 ,  G09G2300/08 ,  G09G2310/027 ,  G09G2320/029 ,  G09G2320/0295 ,  G09G2320/043 ,  G09G2320/048 ,  G09G2320/0693 ,  G09G2360/145

    Abstract: Organic LED displays are vulnerable to developing age dependent non-uniformities of emitted light across a display matrix; there is accordingly a need for rapidly and accurately correcting such non-uniformities in an initially calibrated display device. As the decay of emitted light follows an exponential law, change in light output can be predicted by accumulating (i.e. performing numeric integration) the driving current for each individual pixel during an elapsed time; then, based on such predicted change, the driving current can be adjusted for each pixel such to compensate the decay. Another possibility of correcting non-uniformities is also described, by arranging a photodetector, such as a camera, for measuring the light emitted gy different single pixels or groups of the same, whose size is made stepwise progressively bigger by adequate displacement of the photodetector along X, Y and Z axis, while correcting unevenesses at every step.

    Abstract translation: 有机LED显示屏容易受到显示矩阵上发射的发光的不均匀的不均匀性的影响; 因此，需要在初始校准的显示装置中快速且准确地校正这种不均匀性。 随着发射光的衰减遵循指数规律，可以通过在经过时间内累积（即执行数字积分）每个像素的驱动电流来预测光输出的变化; 那么，基于这样的预测变化，可以针对每个像素调整驱动电流以补偿衰减。 还描述了校正不均匀性的另一种可能性，通过布置诸如照相机的光电检测器来测量发射的不同单个像素或其组的光，其尺寸通过光电检测器沿着足够的位移而逐渐变大 X，Y和Z轴，同时在每一步修正不均匀。

    LINE SCANNING CIRCUIT FOR A DUAL-MODE DISPLAY
    4.
    发明申请
    LINE SCANNING CIRCUIT FOR A DUAL-MODE DISPLAY 审中-公开
    用于双模式显示的线扫描电路

    公开(公告)号：WO0019476A3

    公开(公告)日：2000-07-27

    申请号：PCT/US9920217

    申请日：1999-09-02

    Applicant: SARNOFF CORP

    Inventor： DAWSON ROBIN MARK ADRIAN ,  SHEN ZILAN ,  IPRI ALFRED CHARLES ,  STEWART ROGER GREEN ,  ATHERTON JAMES HAROLD ,  CONNOR STEPHEN JOHN

    IPC: H05B33/08 ,  G09G3/20 ,  G09G3/30 ,  G09G3/32 ,  H01L51/50

    CPC classification number: G09G3/3233 ,  G09G3/20 ,  G09G3/3266 ,  G09G3/3291 ,  G09G2300/0819 ,  G09G2300/0852 ,  G09G2300/0861 ,  G09G2310/0286 ,  G09G2310/062 ,  G09G2310/063 ,  G09G2320/043

    Abstract: A row-select circuit (118) for an organic light emitting diode display (116) propagates a gating pulse through a shift register. This gating pulse is synchronized with a system clock signal and is used to selectively apply a plurality of broadcast control signals to a selected row of pixels on the display (116). The line scanning circuitry (118) is controlled to clear and autozero the pixels in the display (116) either on line at a time or the entire image frame at a time. According to another aspect of the invention, the clearing of a row of pixels in the display (116) is performed over several line intervals before the row is autozeroed and loaded with new values. According to yet another aspect of the invention, the broadcast control signals may be adapted to achieve the best performance for each display device.

    Abstract translation: 用于有机发光二极管显示器（116）的行选择电路（118）通过移位寄存器传播选通脉冲。 该选通脉冲与系统时钟信号同步，并用于选择性地将多个广播控制信号施加到显示器（116）上的选定行像素。 线扫描电路（118）被控制以一次在线清除和自动调整显示器（116）中的像素或一次在整个图像帧处。 根据本发明的另一方面，在行被自动调整并加载新值之前，在几行间隔上执行显示器（116）中的一行像素的清除。 根据本发明的又一个方面，广播控制信号可以适合于为每个显示设备实现最佳性能。

    A METHOD AND APPARATUS FOR CALIBRATING DISPLAY DEVICES AND AUTOMATICALLY COMPENSATING FOR LOSS IN THEIR EFFICIENCY OVER TIME
    5.
    发明申请
    A METHOD AND APPARATUS FOR CALIBRATING DISPLAY DEVICES AND AUTOMATICALLY COMPENSATING FOR LOSS IN THEIR EFFICIENCY OVER TIME 审中-公开
    一种用于校准显示设备的方法和装置，并且在时间上自动补偿其效率的损失

    公开(公告)号：WO0163587A9

    公开(公告)日：2003-02-20

    申请号：PCT/US0140169

    申请日：2001-02-22

    Applicant: SARNOFF CORP

    Inventor： SHEN ZILAN ,  MATTHIES DENNIS LEE ,  ATHERTON JAMES H ,  STEWART ROGER GREEN

    IPC: H01L51/50 ,  G09G3/20 ,  G09G3/30 ,  G09G3/32 ,  H04N17/04

    CPC classification number: G09G3/3208 ,  G09G2300/026 ,  G09G2300/08 ,  G09G2310/027 ,  G09G2320/029 ,  G09G2320/0295 ,  G09G2320/043 ,  G09G2320/048 ,  G09G2320/0693 ,  G09G2360/145

    Abstract: Organic LED displays are vulnerable to developing age dependent non-uniformities of emitted light across a display matrix; there is accordingly a need for rapidly and accurately correcting such non-uniformities in an initially calibrated display device. As the decay of emitted light follows an exponential law, change in light output can be predicted by accumulating (i.e. performing numeric integration) the driving current for each individual pixel during an elapsed time; then, based on such predicted change, the driving current can be adjusted for each pixel such to compensate the decay. Another possibility of correcting non-uniformities is also described, by arranging a photodetector, such as a camera, for measuring the light emitted by different single pixels or groups of the same, whose size is made stepwise progressively bigger by adequate displacement of the photodetector along X, Y and Z axis, while correcting unevenesses at every step.

    Abstract translation: 有机LED显示屏容易受到显示矩阵上发射的发光的不均匀的不均匀性的影响; 因此，需要在初始校准的显示装置中快速且准确地校正这种不均匀性。 随着发射光的衰减遵循指数规律，可以通过在经过时间内累积（即执行数字积分）每个像素的驱动电流来预测光输出的变化; 那么，基于这样的预测变化，可以针对每个像素调整驱动电流以补偿衰减。 还描述了校正不均匀性的另一种可能性，通过布置诸如照相机的光电检测器，用于测量由不同单个像素或其组合发射的光，其尺寸通过光电检测器沿着适当的位移而逐渐变大 X，Y和Z轴，同时在每一步修正不均匀。

    Thin-film transistor circuitry
    6.
    发明申请
    Thin-film transistor circuitry 审中-公开
    薄膜晶体管电路

    公开(公告)号：WO0148822A3

    公开(公告)日：2002-04-25

    申请号：PCT/US0035501

    申请日：2000-12-28

    Applicant: SARNOFF CORP

    Inventor： DAWSON ROBIN MARK ADRIAN ,  SHEN ZILAN ,  IPRI ALFRED CHARLES ,  STEWART ROGER GREEN ,  KANE MICHAEL GILLIS

    IPC: G02F1/1368 ,  H01L21/336 ,  H01L21/8234 ,  H01L27/06 ,  H01L27/08 ,  H01L27/12 ,  H01L29/786 ,  H01L51/50 ,  H01S5/042 ,  H01L27/00 ,  G02F1/1362 ,  G06F17/50 ,  H01L27/02

    CPC classification number: H01L27/12 ,  H01S5/042

    Abstract: A circuit design technique polysilicon thin-film transistor (TFT) circuitry produces circuits that are relatively less sensitive to threshold variations among the TFT's than circuits designed using conventional techniques. The circuit is designed such that thin-film transistors that are sensititve to threshold variations are made larger than other thin-film transistors in the circuitry to minimize threshold variations among similar transistors implemented in the circuit. In one embodiment, a pixel structure for an active matrix display device implemented in polysilicon includes two transistors, a select transistor and a drive transistor. The drive transistor in the pixel structure is a thin film metal oxide silicon (MOS) transistor that includes a gate to source capacitance sufficient to hold an electrical potential which keeps the transistor in a conducting state for an image field interval. One embodiment of the pixel structure includes only the select transistor and the drive transistor. The pixel storage capacitance is entirely realized by the gate to source capacitance of the drive transistor. Another embodiment of the pixel structure includes a capacitor which is much smaller than the capacitor of a conventional active matrix pixel structure. This capacitor holds the pixel in a non-illuminated state when the drive transistor is turned off. This pixel structure may be used with any display technology that uses an active matrix and stores image data on a capacitance in the pixel, including without limitation, organic light emitting diodes, electroluminescent devices, and inorganic light emitting diodes.

    9.
    发明专利
    未知

    公开(公告)号：DE69332475T2

    公开(公告)日：2003-07-10

    申请号：DE69332475

    申请日：1993-05-28

    Applicant: SARNOFF CORP

    Inventor： STEWART ROGER GREEN

    IPC: G09G3/20 ,  G09G3/30

    Abstract: An active matrix electroluminescent display (AMELD) having an improved light emitting efficiency and methods of operating the AMELD to produce gray scale operation are disclosed. The invention is an AMELD comprising a plurality of pixels, each pixel (42) including a first transistor (44) having its gate connected to a select line (46), its source connected to a data line (48) and its drain connected to the gate of a second transistor (50), the second transistor (50) having its source connected to the data line (48) and its drain connected to a first electrode of an electroluminescent (EL) cell. The EL cell's second electrode is connected to alternating high voltage source (59). A method for producing gray scale performance including the step of varying the length of time the second transistor is on while the alternating voltage is applied to the EL cell is also disclosed.

    10.
    发明专利
    未知

    公开(公告)号：DE69332475D1

    公开(公告)日：2002-12-12

    申请号：DE69332475

    申请日：1993-05-28

    Applicant: SARNOFF CORP

    Inventor： STEWART ROGER GREEN

    IPC: G09G3/20 ,  G09G3/30 ,  H05B44/00

    Abstract: An active matrix electroluminescent display (AMELD) having an improved light emitting efficiency and methods of operating the AMELD to produce gray scale operation are disclosed. The invention is an AMELD comprising a plurality of pixels, each pixel (42) including a first transistor (44) having its gate connected to a select line (46), its source connected to a data line (48) and its drain connected to the gate of a second transistor (50), the second transistor (50) having its source connected to the data line (48) and its drain connected to a first electrode of an electroluminescent (EL) cell. The EL cell's second electrode is connected to alternating high voltage source (59). A method for producing gray scale performance including the step of varying the length of time the second transistor is on while the alternating voltage is applied to the EL cell is also disclosed.

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