公开(公告)号：WO03002957A3

公开(公告)日：2003-05-01

申请号：PCT/US0220243

申请日：2002-06-24

Applicant: CANDESCENT TECH CORP

Inventor： CUMMINGS WILLIAM ,  DUNPHY JAMES C ,  HANSEN RONALD L ,  LIU JUN ,  CRESSI LEE ,  STANNERS COLIN ,  SPINDT CHRISTOPHER J

IPC: G01R31/24 ,  G09G3/20 ,  G09G3/22 ,  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.

Abstract translation: 用于补偿场发射器件（100a）中的亮度变化的方法。 在一个实施例中，描述了用于测量场致发射显示器（FED）设备（100a）的行的相对亮度的方法和系统，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 在显示器中通过调节行电压和/或行导通时间周期。 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。 该实施例补偿了行的亮度变化，例如对于间隔壁（30）附近的行。 在另一个实施例中，将周期性信号（例如高频噪声信号（340））加到行导通时间脉冲上以便伪装间隔壁（30）附近的行中的亮度变化。 在另一个实施例中，基于存储在存储器驻留校正表（60）中的校正值来调整行导通时间脉冲下的面积以提供逐行亮度补偿。 在另一个实施例中，每行的亮度被测量并被编译成用于FED的数据简档。 数据配置文件用于控制阴极老化过程，以便通过物理改变行发射器的特性来校正亮度变化。

公开(公告)号：AU2002320162A1

公开(公告)日：2003-03-03

申请号：AU2002320162

申请日：2002-06-24

Applicant: CANDESCENT TECH CORP

Inventor： HANSEN RONALD L ,  CRESSI LEE ,  SPINDT CHRISTOPHER J ,  DUNPHY JAMES C ,  LIU JUN ,  CUMMINGS WILLIAM ,  STANNERS COLIN

IPC: G01R31/24 ,  G09G3/20 ,  G09G3/22 ,  G09G3/10

Abstract: In a field emission display (FED) device comprising: rows and columns of emitters; and an anode electrode, a method of measuring display attributes of said FED device comprising the steps of: a) in a scan fashion, individually driving each row and measuring the current drawn by each row, wherein a settling time is allowed after each row is driven; b) measuring a background current level during a vertical blanking interval; c) correcting current measurements taken during said step a) by said background current level to yield corrected current measurements; d) averaging multiple corrected current measurements taken over multiple display frames to produce averaged corrected current values for all rows of said FED device; and e) generating a memory resident correction table based on said averaged corrected current values.