Pixel Circuits for AMOLED displays

• US 9,886,899 B2
• Filed: 09/19/2014
• Issued: 02/06/2018
• Est. Priority Date: 05/17/2011
• Status: Active Grant

• Current Assignee: IGNIS Innovation Incorporated
• Original Assignee: IGNIS Innovation Incorporated
• Inventors: Azizi, Yaser, Chaji, Gholamreza
• Primary Examiner(s): XAVIER, ANTONIO J
• Application Number:
  US14/491,763
• Publication Number:
  US 20150054811A1
• Time in Patent Office: 1,236 Days
• Field of Search: None
• CPC Class Codes: G06F 1/3218 of display devices
• CPC Class Codes: G06F 1/3265 Power saving in display device
• CPC Class Codes: G09G 2300/0866 by means of changes in the pixel supply voltage
• CPC Class Codes: G09G 2320/043 Preventing or counteracting the effects of ageing
• CPC Class Codes: G09G 2320/045 Compensation of drifts in the characteristics of light emitting or modulating elements
• CPC Class Codes: G09G 2320/048 using evaluation of the usage time
• CPC Class Codes: G09G 2320/0613 The adjustment depending on the type of the information to be displayed
• CPC Class Codes: G09G 2320/0626 for control of overall brightness
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 2330/022 in absence of operation, e.g. no data being entered during a predetermined time
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: Y02B 70/10 Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
• CPC Class Codes: Y02D 10/00 Energy efficient computing, e.g. low power processors, power management or thermal management

Abstract

A system for driving a display that includes a plurality of pixel circuits arranged in an array, each of the pixel circuits including a light emitting device and a driving transistor for conveying a driving current through the light emitting device. Each of a first plurality of supply lines is associated with at least one pixel circuit in a preselected segment of the array, the first plurality of supply lines providing driving currents to the at least one pixel circuit in the preselected segment. Each of a plurality of voltage supplies is configured to provide a supply voltage to the at least one pixel circuit in the preselected segment of the array, the voltage supplies being controllably coupled to the pixel circuits in the preselected segment of the array. A controller determines which of the plurality of voltage supplies to connect to the preselected segment of the array.

Claims

1. A system for driving a display, the system comprising:

a plurality of pixel circuits arranged in an array, each of said pixel circuits comprising a light emitting device and a driving transistor for conveying a driving current through the light emitting device, said array being divided into multiple segments adapted to receive different static supply voltages for a duration exceeding a refresh period of the display;

a first plurality of supply lines each associated with at least one pixel circuit in a preselected segment of said array, the first plurality of supply lines providing driving currents to the at least one pixel circuit in said preselected segment

a plurality of voltage supplies configured to simultaneously provide different static supply voltages greater than zero to different segments of said array enabling light emitting devices of pixels circuits from each of said different segments powered by each of said different static supply voltages to simultaneously emit light, said voltage supplies being controllably coupled to the pixel circuits in said preselected segment of said array for the duration exceeding the refresh period of the display; and

a controller for determining which of said plurality of voltage supplies, if any, is connected to each of said multiple segments of said array for the duration exceeding the refresh period of the display.

2. The system of claim 1 which includes controllable switches coupling said plurality of voltage supplies to the at least one pixel circuit in each of said multiple segments of said array for the duration exceeding the refresh period of the display.