Variable Frame Frequency OLED Compensation via Parallel Pixel Line Sensing
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Solution Overview
Problem
Conventional sense driving methods in organic light emitting display devices require prolonged time for updated compensation as the area and resolution of the display panel increase, necessitating a new scheme to reduce compensation time while maintaining accuracy.
Innovation Solution
The organic light emitting display device incorporates an input unit for variable frame frequency image data, a sensing control unit to generate sensing control signals during a variable vertical blank period, and a TFT compensating unit to sense driving characteristics, allowing for increased sensing times within a variable frame period, thereby reducing the time required for updated compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensing is performed within one vertical blank period per pixel line, then sensing accuracy is maintained, but total compensation time increases significantly
Solution Approach 1:
The patent divides the sensing process into multiple segments by performing sensing on multiple pixel lines simultaneously within a single vertical blank period. Instead of sensing one pixel line at a time sequentially, the system senses multiple pixel lines in parallel, thereby reducing the total number of vertical blank periods required and significantly shortening the overall compensation time while maintaining sensing accuracy
Solution Approach 2:
The patent implements periodic sensing operations during vertical blank periods by selectively enabling sensing for multiple pixel lines based on a sensing enable signal. This periodic action allows the system to perform sensing operations at optimal intervals without continuously interfering with the display output, thus reducing total compensation time while preserving measurement precision
2Loss of time
If multiple pixel lines are sensed simultaneously within one vertical blank period, then compensation time is reduced, but sensing control complexity increases
Solution Approach 1:
The patent employs a universal sensing control mechanism that can handle both single and multiple pixel line sensing operations through a unified control architecture. The sensing control unit generates sensing control signals that can selectively enable sensing for one or multiple pixel lines based on the same control logic, thereby reducing sensing time without proportionally increasing control complexity
Solution Approach 2:
The patent introduces a sensing enable signal as an intermediary control element that mediates between the display control system and the sensing operation. This intermediary signal coordinates the simultaneous sensing of multiple pixel lines by controlling the timing and selection of sensing operations, thereby managing the increased complexity through a dedicated control interface
Data Source
AI summary
The organic light emitting display device according to the present disclosure comprises an input unit configured to receive image data input at a variable frame frequency, a sensing control unit configured to generate a sensing control signal for sensing pixels to which the image data is to be applied, in a vertical blank period varying according to the variable frame frequency and a TFT compensating unit configured to sense driving characteristics of a driving element included in the pixels according to the sensing control signal to output a first sensing result. Among one variable frame period, a vertical active period for applying the image data to the pixels is fixed and the vertical blank period in which no image data is applied to the pixels is varied according to the variable frame frequency.