Pixel circuits for AMOLED displays

• US 10,515,585 B2
• Filed: 01/11/2018
• Issued: 12/24/2019
• 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
• Application Number:
  US15/867,937
• Publication Number:
  US 20180137821A1
• Time in Patent Office: 712 Days
• 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 device comprising:

a display module including;

a display panel having 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; and

a display driver including a plurality of frame buffers, for driving the display panel, for receiving, prior to entering a standby mode of the device, standby frame data for displaying a plurality of standby frames, for storing said standby frame data in the plurality of frame buffers, and for controlling a display of the plurality of standby frames on the display panel during the standby mode of the device; and

a main system coupled to the display module for transferring to the display driver prior to said standby mode of the device, said standby frame data and refraining from transferring to the display driver during said standby mode of the device, said standby frame data.

2. The device of claim 1 wherein the main system transmits said standby frame data to the display driver during at least one of boot-up or power-up.

3. The device of claim 1 wherein the display driver controls the display of each standby frame on the display panel by programming the display panel with use of the standby frame data.

4. The device of claim 3 wherein said plurality of frame buffers comprises full frame buffers.

5. The device of claim 1 wherein the display driver controls the display of the plurality of standby frames by producing recursive changes to content displayed in the display panel.

6. The device of claim 1 wherein the display driver selects each standby frame for display on the display panel depending upon different conditions.

7. The device of claim 6 wherein at least one of said different conditions is time.

8. The device of claim 7 wherein said display driver controls the display of said standby frames on the display panel by flipping between different standby frames over time.

9. The device of claim 1 wherein the display driver further comprises an event controller, and wherein the display driver controls the display of said standby frames on the display with use of the event controller.

10. The device of claim 9 wherein the event controller comprises a timer for use by the display driver to control the display of said standby frames on the display panel by flipping between different standby frames over time.

11. The device of claim 1 wherein said plurality of frame buffers comprises partial frame buffers.

12. The device of claim 11 wherein said partial frame buffers store changes to be applied to the display for the display of the plurality of standby frames on the display panel based on certain conditions.

13. The device of claim 12 wherein said plurality of frame buffers comprises full frame buffers, each of said partial frame buffers storing changes to be applied to content of a full frame buffer.

14. The device of claim 13 wherein the display driver comprises a content generator which selects a partial frame buffer and applies it to a full frame buffer based on certain conditions for display as a standby frame on the display panel.

15. The device of claim 13 wherein the display driver comprises a content generator which selects multiple full and partial frame buffers to create content for display as a standby frame on the display panel.