Display Panel Row Sensing with Preliminary Data Voltage Control
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Solution Overview
Problem
Existing display devices face challenges in achieving improved display quality, particularly in managing the luminance differences between rows of sub-pixels during sensing operations, which can result in visible dark lines and reduced image quality.
Innovation Solution
The display device employs a panel driver that applies preliminary data voltages, such as black data voltages, to sub-pixels on the same row as those undergoing sensing operations during a blank period, along with a two-or-more-stack tandem structure for sub-pixels, to manage luminance and enable real-time sensing without affecting the display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensing operations are performed on sub-pixels during the blank period, then real-time sensing capability is improved, but luminance differences between rows cause visible dark lines and display quality degradation
Solution Approach 1:
The patent applies preliminary data voltages to sub-pixels before sensing operations during the blank period. This preliminary action ensures that sub-pixels maintain their luminance state before sensing, preventing the formation of visible dark lines while enabling accurate real-time sensing of display characteristics
Solution Approach 2:
The patent applies different data voltages to different sub-pixels based on their specific sensing requirements. By locally adjusting the voltage applied to individual sub-pixels or groups of sub-pixels, the system maintains luminance uniformity across rows while enabling targeted sensing operations on specific sub-pixels
2Object-affected harmful factors
If data voltages are applied to sub-pixels during the blank period for sensing, then display quality is improved, but additional power consumption occurs
Solution Approach 1:
The patent applies data voltages only to specific sub-pixels that require sensing during the blank period, rather than to all sub-pixels. This partial action approach maintains display quality by ensuring sensed sub-pixels have proper luminance while minimizing unnecessary power consumption from non-sensed sub-pixels
3Stability of the object's composition
If preliminary data voltages are applied to all sub-pixels before sensing, then luminance uniformity is improved, but device complexity increases
Solution Approach 1:
The patent applies preliminary data voltages selectively to specific sub-pixels or groups of sub-pixels based on their sensing requirements and row positions, rather than uniformly to all sub-pixels. This localized approach maintains luminance uniformity where needed while reducing the complexity of the driver circuit by avoiding unnecessary voltage applications
Data Source
AI summary
A display device includes a display panel including sub-pixels; and a panel driver configured to sequentially apply data voltages to the sub-pixels in units of rows in an active period of one frame, and to perform a sensing operation on first sub-pixels emitting light of a first color among sub-pixels arranged on any one row among the sub-pixels in a blank period of the one frame, wherein the panel driver is configured to apply preliminary data voltages to the first sub-pixels before the sensing operation in the blank period.