Light Emitting Display Subpixel Initialization and Sensing
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Solution Overview
Problem
Light emitting display devices face challenges in maintaining consistent voltage initialization and reducing sensing deviations, particularly when initialized with a voltage lower than the threshold voltage of OLEDs, which affects sensing accuracy and image quality.
Innovation Solution
The implementation of a light emitting display device with a display panel featuring subpixels sharing a single sensing line, where one subpixel is designated as a sensing subpixel and another as a non-sensing subpixel, with distinct initialization and sensing periods to ensure consistent voltage convergence and improved accuracy, including a longer initial period for non-sensing subpixels to prevent interference during sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a voltage lower than the threshold voltage of OLEDs is used for initialization, then power consumption is reduced, but voltage convergence around sensing nodes becomes inconsistent and sensing accuracy deteriorates
Solution Approach 1:
The patent applies preliminary action by extending the initialization period duration to ensure complete voltage convergence before sensing operations begin. This extended initialization time allows the sensing node voltage to fully stabilize at the initialization voltage level, preventing sensing deviations that would otherwise occur with shorter initialization periods. The solution prioritizes sensing accuracy by providing sufficient time for voltage equilibrium to be established before measurement.
2Device complexity
If M subpixels share a single sensing line, then device complexity is reduced, but sensing deviations increase due to interference from non-sensing subpixels
Solution Approach 1:
The patent applies segmentation by dividing the operation of subpixels into distinct time segments: sensing subpixels are activated during sensing periods while non-sensing subpixels are held at initialization voltage during their initial periods. This temporal segmentation prevents simultaneous activation conflicts and eliminates interference between sensing and non-sensing subpixels, maintaining sensing accuracy while preserving the simplified shared sensing line architecture.
Solution Approach 2:
The patent implements periodic action through alternating sensing periods and initial periods for different subpixels. Non-sensing subpixels undergo initialization during their designated initial periods, while sensing subpixels perform sensing operations during sensing periods. This periodic alternation ensures that at any given time, only the appropriate subpixels are active, preventing interference and maintaining sensing precision without requiring separate sensing lines for each subpixel.
3Stability of the object's composition
If non-sensing subpixels are initialized continuously, then voltage convergence is improved, but the time available for sensing operations is reduced
Solution Approach 1:
The patent resolves this time conflict through periodic action by implementing alternating initial periods and sensing periods for different subpixels. Non-sensing subpixels are initialized during their designated initial periods, while sensing subpixels perform sensing operations during their sensing periods. This periodic alternation ensures that voltage convergence is achieved for non-sensing subpixels without continuously occupying the sensing line, thereby preserving sufficient time for sensing operations.
Solution Approach 2:
The patent applies preliminary action by completing the initialization of non-sensing subpixels before their respective sensing operations begin. The extended initial period ensures that voltage convergence is fully achieved in advance, so that when the sensing period commences, the sensing node is already stabilized and ready for accurate measurement, eliminating the need for extended sensing time.
Data Source
AI summary
A light emitting display device can include a display panel including M subpixels sharing a sensing line, wherein M is an integer equal to or greater than 2; and a circuit configured to sense one or more elements included in at least one of the M subpixels through the sensing line, in which the M sub-pixels are initialized based on an initialization voltage during an initial period, the M sub-pixels are sensed based on a sensing voltage during a data writing period, and an amount of time of the initial period is longer than an amount of time of the data writing period.