公开(公告)号：WO2003002957A2

公开(公告)日：2003-01-09

申请号：PCT/US2002/020243

申请日：2002-06-24

Applicant: CANDESCENT TECHNOLOGIES CORPORATION

Inventor： CUMMINGS, William ,  DUNPHY, James, C. ,  HANSEN, Ronald, L. ,  LIU, Jun ,  CRESSI, Lee ,  STANNERS, Colin ,  SPINDT, Christopher, J.

IPC: G01J

CPC classification number: G09G3/22 ,  G09G2320/0233 ,  G09G2320/0285

Abstract: Methods for compensating for brightness variations in a field emission device. In one embodiment, a method and system are described for measuring therelative brightness of rows of a field emission display (FED) device, storinginformation representing the measured brightness into a correction table and using the correction table to provide uniform row brightness in the display by adjustingrow voltages and/or row on-time periods. A special measurement process is described for providing accurate current measurements on the rows. This embodiment compensates for brightness variations of the rows, e.g., for rows nearthe spacer walls. In another embodiment, a periodic signal, e.g., a high frequencynoise signal, is added to the row on-time pulse in order to camouflage brightnessvariations in the rows near the spacer walls. In another embodiment, the areaunder the row on-time pulse is adjusted to provide row-by-row brightnesscompensation based on correction values stored in a memory resident correctiontable. In another embodiment, the brightness of each row is measured and compiled into a data profile for the FED. The data profile is used to control cathodeburn-in processes so that brightness variations are corrected by physically altering the characteristics of the emitters of the rows.

Abstract translation: 用于补偿场致发射装置（100a）中的亮度变化的方法。 在一个实施例中，描述了用于测量场发射显示（FED）装置（100a）的行的相对亮度的方法和系统，其将表示测量的亮度的信息存储到校正表中，并且使用校正表来提供均匀的行亮度 通过调节行电压和/或行导通时间周期来显示。 描述了一种特殊的测量过程，用于在行上提供精确的电流测量。 该实施例补偿行的亮度变化，例如用于靠近隔离壁（30）的行。 在另一个实施例中，周期性信号，例如高频噪声信号（340）被添加到行准时脉冲，以伪装靠近隔离壁（30）的行中的亮度变化。 在另一个实施例中，调整行导通时间脉冲之下的区域，以基于存储在存储器驻留校正表（60）中的校正值提供逐行亮度补偿。 在另一个实施例中，测量每行的亮度并将其编译成用于FED的数据简档。 数据轮廓用于控制阴极老化过程，从而通过物理地改变行的发射器的特性来校正亮度变化。

公开(公告)号：WO2003091976A1

公开(公告)日：2003-11-06

申请号：PCT/US2003/011841

申请日：2003-04-18

Applicant: CANDESCENT TECHNOLOGIES CORPORATION ,  SONY CORPORATION

Inventor： HANSEN, Ronald, L. ,  DUNPHY, James, C. ,  SPINDT, Christopher, J. ,  CLEEVES, James, M. ,  TRUPPA, Jerome, M. ,  FINK, Gregory, M. ,  IGUCHI, Yukinobu

IPC: G09G3/22

CPC classification number: G09G3/22 ,  G09G3/2011 ,  G09G3/2014 ,  G09G5/02 ,  G09G2310/06 ,  G09G2320/0285 ,  G09G2320/029 ,  Y10S345/904

Abstract: A field emission display (110) having a correction system (105) with a correction coefficient derived from emission current is presented. Within one embodiment, a field emission display (110) with an anode (25) at the faceplate and a focus structure (90). The anode potential is held at ground while the focus structure (90) potential is held between, but is not limited to, 40 and 50 volts. The current flowing to the focus structure (90) is measured and used as the basis for the correction coefficient for the field emission display (110).

Abstract translation: 具有具有从发射电流导出的校正系数的校正系统（105）的场致发射显示器（110）。 在一个实施例中，在面板上具有阳极（25）的场发射显示器（110）和聚焦结构（90）。 阳极电位保持在地面，同时聚焦结构（90）电位保持在但不限于40和50伏之间。 流过聚焦结构（90）的电流被测量并用作场致发射显示器（110）的校正系数的基础。

公开(公告)号：WO2003052726A1

公开(公告)日：2003-06-26

申请号：PCT/US2002/040599

申请日：2002-12-18

Applicant: CANDESCENT TECHNOLOGIES CORPORATION

Inventor： DUNPHY, James, C. ,  ELLOWAY, Donald, J.

IPC: G09G3/10

CPC classification number: G09G3/22 ,  H01J9/44 ,  H01J2209/0223

Abstract: A method of removing contaminant particles (93) from faceplates (90) in newly fabricated field emission displays so that a uniform distribution of contaminants is achieved at the emitter sites of the display device contaminants are removed from the display faceplate by electron induced desorption. The emission current profile at the emitter sites is selected so that the distribution of reabsorbed contaminants is equalized. The variations in current emission compensate for shadowing effects due to spacer walls (91) to produce a uniform reabsorption distribution. The emitter sites may driven using an aninated contrast image at a constant current for the display.

Abstract translation: 一种在新制造的场发射显示器中从面板（90）去除污染物颗粒（93）的方法，使得在显示装置的发射器位置实现污染物的均匀分布，通过电子诱导的解吸从污染物去除显示面板。 选择发射极位置处的发射电流分布，使得再吸收的污染物的分布相等。 电流发射的变化补偿了由间隔壁（91）产生的均匀的再吸收分布所产生的阴影效应。 发射器位置可以使用用于显示的恒定电流的对准图像来驱动。

公开(公告)号：WO2002073582A2

公开(公告)日：2002-09-19

申请号：PCT/US2002/006067

申请日：2002-02-26

Applicant: CANDESCENT TECHNOLOGIES CORPORATION

Inventor： DUNPHY, James, C. ,  HANSEN, Ronald, L. ,  LINDBERG, Brian, E. ,  TRUPPA, Jerome, M. ,  ELLOWAY, Donald, J. ,  AMANIAMPONG, Duke, K.

IPC: G09G3/10

CPC classification number: H01J9/44 ,  G09G3/22 ,  G09G2310/066 ,  H01J2209/0223

Abstract: This writing discloses a method and a circuit for powering-on andpowering-off an FED screen during normal operation to reduce emitter and gate electrode degradation.

Abstract translation: 用于场致发射显示装置的接通和关断元件的电路和方法，以防止发射极（60）和栅电极（50）劣化。 电路（910）包括具有定序器的控制逻辑（916），其在一个实施例中可以使用状态机来实现。 在电源接通时，控制逻辑向向阳极电极（914）供应电压的高电压电源（912）发送使能信号。 此时，低电压电源（918）和驱动电路（920）被禁用。 当从高压电源接收到确认信号时，控制逻辑使能向驱动电路（920）提供电压的低压电源。 当从低电压电源（918）接收到确认信号时，或者可选地，在预定时间段期满之后，控制逻辑（916）然后启用驱动电路（50）和发射极 构成FED装置的行和列的电极（60）。 在断电时，控制逻辑（916）首先禁用低电压电源（918），然后禁用高压电源（912）。

公开(公告)号：EP1092181A1

公开(公告)日：2001-04-18

申请号：EP99912865.5

申请日：1999-03-23

Applicant: Candescent Technologies Corporation

Inventor： DUNPHY, James, C. ,  SCHROPP, Donald, R., Jr.

IPC: G05F1/00

CPC classification number: G09G3/22 ,  G09G2300/043 ,  H01J29/028 ,  H01J31/127 ,  H01J2329/8625 ,  H01J2329/864 ,  H01J2329/8645

Abstract: A voltage ratio regulator circuit (300) for a spacer electrode (140) of a flat panel display screen. Within one implementation of a field emission display (FED) device (100), thin spacer walls (130) are inserted between a high voltage (Vh) faceplate (120) and a backplate (164) to secure these structures are a vacuum is formed between. The faceplate (120) warms relative to the backplate (164) as a result of energy released by a phosphor layer, thereby generating a temperature gradient along the spacer walls (130). The top portion of each spacer wall (130) becomes more conductive with increased temperature and acts to attract electrons that are emitted toward the faceplate (120). To counter this attraction, a spacer electrode (140) is placed along each spacer wall (130) at a height, d, above the backplate (164) and maintained at a voltage, Ve. The spacer electrode (140) at Ve and the high voltage supply (250) at Vh are both coupled to a voltage ratio regulator circuit (300) which maintains the ratio (Ve/Vh) using voltage dividers (R1, R2, R10 and R11, R3), an operational amplifier (310) and other circuitry. The voltage ratio regulator (300) compensates for variations in voltage supply performance. The time constants (R1, C1 and R3, C3) of the voltage ratio regulator circuit (300) is tuned to be near or slightly faster than the time constant of the inherent resistance (RW1, RW2) and capacitance (CW1, CW2) of the spacer wall (130). The invention improves the electron path accuracy for pixels located near spacer walls.

公开(公告)号：EP1101239A1

公开(公告)日：2001-05-23

申请号：EP99930812.5

申请日：1999-06-29

Applicant: Candescent Technologies Corporation

Inventor： SCHROPP, Donald, R., Jr. ,  FIELD, John, E. ,  DUNPHY, James, C. ,  PAN, Lawrence, S. ,  MORRIS, David, L. ,  BESSER, Ronald, S. ,  SPINDT, Christopher, J.

IPC: H01J19/38

CPC classification number: H01J29/028 ,  H01J29/467 ,  H01J29/481 ,  H01J31/127 ,  H01J2201/025 ,  H01J2329/8625

Abstract: The intensity at which electrons emitted by a first plate structure (10) in a slat-panel display strike a second plate structure (12) for causing it to emit light is controlled so as to reduce image degradation that could otherwise arise from undesired electron-trajectory changes caused by effects such as the presence of a spacer system (14) between the plate structures. An electron-emissive region (20) in the first plate structure typically contains multiple laterally separated electron-emissive portions (201 and 202) for selectively emitting electrons. An electron-focusing system in the first plate structure has corresponding focus openings (40p1 and 40p2) through which electrons emitted by the electron-emissive portions respectively pass. Upon being struck by the so-emitted electrons, a light-emissive region (22) in the second plate structure emits light to produce at least part of a dot of the display's image.

公开(公告)号：EP1364361A2

公开(公告)日：2003-11-26

申请号：EP02725025.7

申请日：2002-02-26

Applicant: Candescent Technologies Corporation

Inventor： DUNPHY, James, C. ,  HANSEN, Ronald, L. ,  LINDBERG, Brian, E. ,  TRUPPA, Jerome, M. ,  ELLOWAY, Donald, J. ,  AMANIAMPONG, Duke, K.

IPC: G09G3/10

CPC classification number: H01J9/44 ,  G09G3/22 ,  G09G2310/066 ,  H01J2209/0223

Abstract: A circuit and method for turning-on and turning-off elements of an field emission display device to protect against emitter electrode(60) and gate electrode(50) degradation. The circuit(910) includes control logic(916) having a sequencer which in one embodiment can be realized using a state machine. Upon power-on, the control logic sends an enable signal to a high voltage power supply (912) that supplies voltage to the anode electrode (914). At this time a low voltage power supply (918) and driving circuitry (920)are disabled. Upon receiving a confirmation signal from the high voltage power supply, the control logic enables the low voltage power supply which supplies voltage to the driving circuitry (920). Upon receiving a confirmation signal from the low voltage power supply (918), or optionally after expiration of a predetermined time period, the control logic (916) then enables the driving circuitry (920) which drives the gate electrodes (50) and the emitter electrodes (60) which make up the rows and columns of the FED device. Upon power down, the control logic (916) first disables the low voltage power supply (918), then the high voltage power supply (912).

公开(公告)号：EP1402506A2

公开(公告)日：2004-03-31

申请号：EP02749666.0

申请日：2002-06-24

Applicant: Candescent Technologies Corporation

Inventor： CUMMINGS, William ,  DUNPHY, James, C. ,  HANSEN, Ronald, L. ,  LIU, Jun ,  CRESSI, Lee ,  STANNERS, Colin ,  SPINDT, Christopher, J.

IPC: G09G3/10

CPC classification number: G09G3/22 ,  G09G2320/0233 ,  G09G2320/0285

Abstract: Method for compensating for brightness variations in a field emission device (100a). In one embodiment, a method and system are described for measuring the relative brightness of rows of a field emission display (FED) device (100a), storing information representing the measured brightness into a correction table and using the correction table to provide uniform row brightness in the display by adjusting row voltages and/or row on-time periods. A special measurement process is described for providing accurate current measurements on the rows. This embodiment compensates for brightness variations of the rows, e.g., for rows near the spacer walls (30). In another embodiment, a periodic signal, e.g., a high frequency noise signal (340), is added to the row on-time pulse in order to camouflage brightness variations in the rows near the spacer walls (30). In another embodiment, the area under the row on-time pulse is adjusted to provide row-by-row brightness compensation based on correction values stored in a memory resident correction table (60). In another embodiment, the brightness of each row is measured and compiled into a data profile for the FED. The data profile is used to control cathode burn-in processes so that brightness variations are corrected by physically altering the characteristics of the emitters of the rows.