公开(公告)号：US20010026251A1

公开(公告)日：2001-10-04

申请号：US09819284

申请日：2001-03-28

Applicant: U.S. Philips Corporation

Inventor： Iain M. Hunter ,  Neil C. Bird

IPC: G09G003/12 ,  G09G003/14 ,  G09G003/20 ,  G09G003/30

CPC classification number: G09G3/325 ,  G09G3/3283 ,  G09G2300/0809 ,  G09G2300/0842 ,  G09G2300/0861 ,  G09G2320/0233

Abstract: A display device has current-addressed pixels, with the currents being supplied by driver circuitry which comprises a transistor (10) for applying a charging voltage to a switched capacitor arrangement (Ci, S1, S2) arranged to selectively charge and discharge the capacitor (Ci) at a predetermined rate to a charging voltage. A transistor control voltage (Vref) is applied to a control terminal of the transistor which is adjusted depending on the transistor threshold voltage to ensure that the capacitor (Ci) is charged to the charging voltage irrespectively of the value of the threshold voltage. This enables an accurately controllable current to be provided which is used to drive the current-addressed pixels.

Abstract translation: 显示装置具有电流寻址像素，其中电流由驱动器电路提供，驱动器电路包括用于向布置成选择性地对电容器充电和放电的开关电容器布置（Ci，S1，S2）施加充电电压的晶体管（10） Ci）以预定的速率与充电电压成比例。 晶体管控制电压（Vref）被施加到晶体管的控制端子，该晶体管的控制端子根据晶体管阈值电压被调节，以确保电容器（Ci）被充电到充电电压，而不管阈值电压的值。 这使得能够提供用于驱动当前寻址的像素的精确可控的电流。

公开(公告)号：US20010030569A1

公开(公告)日：2001-10-18

申请号：US09741673

申请日：2000-12-19

Applicant: U.S. PHILIPS CORPORATION

Inventor： Neil C. Bird

IPC: H03K017/62

CPC classification number: H03K17/76

Abstract: A multiplexer circuit is disclosed for switching a selected one of a plurality of current inputs carried by respective input lines (2;101) to a common output. The circuit comprises, for each input line, a diode clamp (5;104) and isolation means (10;109) provided between each input line and the common terminal The diode clamp (5;104) is operable in a first mode in which voltages are applied to the clamp terminals such that the diodes (8,9;107,108) of the diode clamp are forward biased and hold the input line (2;101) at a first voltage which prevents the passage of current from the input line to the common output, and a second mode in which the voltages are applied to the clamp terminals such that the diodes of the diode clamp are reverse biased and the passage of the current from the input line to the common output is allowed. Only two connections, for the diode clamp, are needed to control the switching of the current input, and the switch introduces no current offset to the output.

Abstract translation: 公开了一种多路复用器电路，用于将由各个输入线（2; 101）承载的多个电流输入中的一个选定的一个电流输入切换到公共输出。 对于每个输入线，该电路包括设置在每个输入线和公共端之间的二极管钳位（5; 104）和隔离装置（10; 109）。二极管钳位（5; 104）可在第一模式中操作，其中 电压施加到钳位端子，使得二极管钳位电路的二极管（8,9; 107,108）被正向偏置，并将输入线（2; 101）保持在第一电压，从而防止电流从输入线路通过 公共输出和第二模式，其中电压被施加到钳位端子，使得二极管钳位电路的二极管被反向偏置，并且允许电流从输入线路通过到公共输出端。 为了控制电流输入的切换，只需要两个连接用于二极管钳位的连接，并且开关不会向输出端引入电流偏移。