Timing Controller Selective Sensing for OLED Brightness Uniformity
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Solution Overview
Problem
As display devices increase in size, the number of driving transistors grows, leading to longer sensing times for transistor characteristics, causing brightness unevenness in organic light emitting display devices, and requiring initial sensing before turning on to achieve uniform brightness.
Innovation Solution
A timing controller that calculates temperature, OFF-ON time differences, and the need for sensing in sub-pixels to determine whether to perform selective sensing, reducing sensing time and allowing the display to turn on without initial sensing, thereby maintaining performance and convenience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensing is performed on all sub-pixels to achieve uniform brightness, then display performance is improved, but sensing time increases
Solution Approach 1:
The patent segments the sensing operation by dividing sub-pixels into different groups that are sensed at different times. Specifically, it performs sensing on first sub-pixels during a first period and on second sub-pixels during a second period, rather than sensing all sub-pixels simultaneously or all at once before display. This segmentation reduces the time any single sub-pixel needs to wait while maintaining brightness uniformity through comprehensive sensing coverage.
Solution Approach 2:
The patent implements periodic sensing operations where different groups of sub-pixels are sensed in alternating periods. The sensing is performed periodically during display operation rather than requiring a complete initial sensing of all sub-pixels before turning on the display. This periodic approach allows the display to become operational faster while still achieving uniform brightness through subsequent sensing cycles.
2Measurement precision
If sensing is performed before turning on the display to achieve uniform brightness, then display performance is improved, but initial driving time increases
Solution Approach 1:
The patent performs preliminary sensing actions on subsets of sub-pixels before they are needed for display, rather than requiring complete preliminary sensing of all sub-pixels. By sensing first sub-pixels during a first period and second sub-pixels during a second period, the system prepares sub-pixels in advance as they become due for display, reducing the overall initial driving time while still achieving brightness uniformity.
Solution Approach 2:
The patent uses periodic sensing operations that continue during display operation rather than requiring a single lengthy initial sensing phase. This allows the display to turn on faster with partial sensing completed, and then continues sensing periodicallY to achieve full brightness uniformity without extending the initial driving time excessively.
3Area of stationary object
If the number of driving transistors is increased to support larger display size, then display area is improved, but sensing time increases
Solution Approach 1:
The patent segments the large number of driving transistors into groups associated with different sub-pixel groups. Instead of sensing all transistors simultaneously, it senses transistors in the first sub-pixel group during a first period and transistors in the second sub-pixel group during a second period. This segmentation makes the sensing process manageable for large displays with many transistors, reducing the total sensing time while maintaining comprehensive coverage.
Solution Approach 2:
The patent implements periodic sensing of driving transistors that continues as the display operates. Rather than requiring all transistor sensing to complete before the display becomes operational, the system performs sensing in periodic cycles, allowing large displays to become operational faster while continuing to sense remaining transistors in subsequent periods.
Data Source
AI summary
There are provided a timing controller of operating selective sensing and an organic light emitting display device comprising the same, the timing controller being configured to selectively perform a sensing when a display panel operates in an ON state. The timing controller performs a sensing to the display panel on the basis of a temperature of the display panel, a time difference in operation of the display panel, and a degree of need for sensing of representative sub-pixels.