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：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.