OLED Display Pixel Block Degradation Sensing Control
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Solution Overview
Problem
Existing OLED display devices require a long sensing time to perform sensing operations on all pixels, which can lead to inefficient degradation monitoring and compensation.
Innovation Solution
The OLED display device groups pixels into blocks and uses a nonvolatile memory to store degradation information. A controller calculates current block degradation and determines whether a sensing operation is needed by comparing this information with a reference value, allowing selective performance of sensing operations on each block.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensing operation is performed on all pixels, then degradation monitoring accuracy is improved, but sensing time increases
Solution Approach 1:
The display panel is divided into multiple pixel blocks, and sensing operations are performed selectively on each block rather than on all pixels simultaneously. This segmentation allows the system to monitor degradation across the entire display while reducing the time required for each sensing operation by focusing on one block at a time.
Solution Approach 2:
The sensing operation is performed periodically on different pixel blocks in a sequential manner. The controller executes sensing operations on multiple blocks across different time periods, ensuring comprehensive degradation monitoring while distributing the time required across multiple cycles, thus reducing the time burden on any single sensing operation.
2Measurement precision
If sensing operation is performed frequently, then degradation detection accuracy is improved, but power consumption increases
Solution Approach 1:
By dividing the display into pixel blocks and performing sensing operations on one block at a time, the system can achieve comprehensive degradation detection across the entire display while reducing the instantaneous power consumption. The segmented approach allows power to be distributed across multiple sensing cycles rather than consumed intensively in a single operation.
Solution Approach 2:
The sensing operation is executed periodically across different pixel blocks rather than continuously on all pixels. This periodic execution reduces overall power consumption by spacing out sensing operations in time, while still maintaining accurate degradation detection through repeated measurements across multiple blocks over successive periods.
Data Source
AI summary
An organic light-emitting diode (OLED) display device includes a display panel including a plurality of pixels, the plurality of pixels being grouped into a plurality of pixel blocks, a nonvolatile memory configured to store previous accumulated block degradation information for the plurality of pixel blocks up to a previous driving period, a controller configured to calculate current block degradation information for the plurality of pixel blocks in a current driving period, to calculate current accumulated block degradation information for the plurality of pixel blocks up to the current driving period by adding the current block degradation information to the previous accumulated block degradation information in response to a power control signal indicating a power-off, and to determine whether a sensing operation for each of the plurality of pixel blocks is to be performed by comparing the current accumulated block degradation information for each of the plurality of pixel blocks with a sensing reference degradation amount, and a sensing circuit configured to selectively perform the sensing operation for each of the plurality of pixel blocks.