Pixel Row Gating for Image Retention Suppression in Displays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The image retention phenomenon in light emitting devices causes luminance differences between display regions and their surroundings when the same image is displayed for a long time, leading to deteriorated display quality.
Innovation Solution
A light emitting device with a pixel array and a vertical scanning circuit that includes a holding circuit and a gate circuit to manage row shifts in display regions, ensuring that only pixels with written image signals emit light, thereby preventing unintended luminance changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display region is shifted to suppress image retention, then image retention is reduced, but display quality deteriorates due to unintended light emission before image signal writing
Solution Approach 1:
The holding circuit performs preliminary action by memorizing the write control signal status before the light emission control signal is supplied to the gate circuit. This advance preparation ensures that the gate circuit can correctly determine whether to output the light emission control signal, preventing unintended light emission in pixels that have not yet received image signals, thus maintaining display quality while suppressing image retention through display region shifting
Solution Approach 2:
The holding circuit acts as an intermediary between the write control circuit and the gate circuit. It receives the write control signal, memorizes its status, and provides this information to the gate circuit, which then uses it to control light emission. This intermediary mechanism ensures coordinated operation between writing and light emission controls, resolving the contradiction between suppressing image retention and maintaining display quality
Data Source
AI summary
A light emitting device including a pixel array including pixels arranged so as to form rows, a write controller to supply a write control signal to a selected row in order to write an image signal, and a light emission controller to supply a light emission control signal to a selected row. The rows include a row including a holding circuit and a gate circuit, the holding circuit memorizes that the write control signal is supplied to the row including the holding circuit and the gate circuit, and in a case where the light emission control signal is supplied to the gate circuit and the holding circuit memorizes that the write control signal is supplied, the gate circuit outputs the light emission control signal to a pixel arranged in a row including the holding circuit and the gate circuit.