Display Panel Brightness Compensation via Shared Sensing Units
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Solution Overview
Problem
Current AMOLED display panels require a large number of optical sensors to ensure uniform brightness, leading to complex manufacturing processes and increased costs as the size of the display panel increases.
Innovation Solution
A display panel design where multiple sub-pixel units share the same sensing unit, allowing for simultaneous measurement and brightness compensation, reducing the need for individual optical sensors and simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If each sub-pixel unit is equipped with an individual optical sensor to measure brightness and perform compensation, then the brightness uniformity is improved, but the device complexity and manufacturing cost increase sharply as display panel size increases
Solution Approach 1:
Multiple sub-pixel units share a common optical sensor instead of each having its own sensor. The patent implements this by using a single optical sensor to measure the brightness of multiple sub-pixel units sequentially, thereby reducing the total number of sensors required while still achieving brightness compensation across the display panel.
Solution Approach 2:
The optical sensor performs periodic brightness measurements of different sub-pixel units in sequence rather than simultaneously. The patent implements this by time-multiplexing the sensor measurements across multiple sub-pixel units, where each sub-pixel unit's brightness is measured at different time intervals, allowing one sensor to serve multiple units.
2Ease of manufacture
If the number of optical sensors is reduced to simplify manufacturing, then the manufacturing process is simplified and cost is reduced, but the ability to accurately measure and compensate brightness of each pixel may be compromised
Solution Approach 1:
The patent performs preliminary characterization of each sub-pixel unit's brightness characteristics during the compensation phase before normal display operation. By measuring and storing compensation data for each sub-pixel unit in advance, the system ensures accurate brightness compensation is available when needed, even though a single sensor is used.
Solution Approach 2:
The patent implements a feedback mechanism where the optical sensor continuously monitors the brightness of sub-pixel units and the compensation module adjusts the driving signals accordingly. This closed-loop feedback ensures that brightness measurement accuracy is maintained despite using fewer sensors, as the system dynamically compensates for variations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach ensures uniform brightness across the display panel by sharing sensing units among sub-pixel units, reducing the number of sensors required and lowering manufacturing costs while maintaining target brightness levels.
Implementation Method 1
a photodiode, each sub-pixel unit includes an OLED and a plurality of thin film transistors, the OLED includes an organic light emitting layer, and the thin film transistors form a thin film transistor array; and wherein the photodiode is arranged between the organic light-emitting layer and the thin film transistor array, and the organic light-emitting layer emits light to the photodiode
Data Source
AI summary
The present application provides a display panel and a brightness compensation method thereof. Multiple sub-pixel units in each pixel unit share the same sensing unit, and the normal display process and optical inspection process of each pixel unit are carried out separately, so as to make each sub-pixel unit reach the target brightness. As a result, the number of sensing units in the optical compensation system could be reduced; the manufacturing process of the display panel could be simplified, and the manufacturing cost of the display panel could be reduced.