Panel Driving Device for Electroluminescent Display Luminance Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Electroluminescent display apparatuses experience luminance deviations between sensed pixel rows and non-sensed pixel rows due to electrical characteristic deviations between pixels.
Innovation Solution
A panel driving device and method that supply a first pixel with a first data voltage and a second pixel with a second data voltage during a vertical active period, and subsequently supply the second pixel with a sensing data voltage and a recovery data voltage during a vertical blank period, where the recovery data voltage includes the first and second data voltages and is supplied later than the sensing data voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If external compensation technology is used to sense pixel voltage or current, then electrical characteristic deviation between pixels is compensated, but luminance deviation occurs between sensed and non-sensed pixel rows
Solution Approach 1:
The patent applies preliminary action by supplying a recovery data voltage to pixel rows after sensing operations to restore their data voltages before they are displayed. This recovery step is performed in advance of the next display cycle, preventing luminance deviation before it occurs. The recovery data voltage is supplied during the vertical blank period, ensuring that sensed pixel rows are restored to their original state before being displayed, thus eliminating the luminance deviation problem while maintaining the electrical characteristic compensation benefit.
2Measurement precision
If sensing operation is performed on pixel rows, then electrical characteristic sensing is achieved, but luminance deviation is caused in sensed pixel rows
Solution Approach 1:
The patent implements feedback by using the sensing results of pixel row electrical characteristics to generate recovery data voltages that are supplied back to the same pixel rows. This feedback mechanism ensures that the sensing operation serves a dual purpose: both measuring electrical characteristics and triggering corrective action. The recovery data voltage is determined based on the sensing results, creating a closed-loop system that automatically compensates for any luminance deviation caused by the sensing operation itself.
Data Source
AI summary
An electroluminescent display apparatus includes a display panel including first and second pixel, a data voltage supply unit supplying the first pixel with a first data voltage of a first gate signal and supplying the second pixel with a second data voltage of a second gate signal in a vertical active period of a first frame and continuously supplying the second pixel with a sensing data voltage and a recovery data voltage of a third gate signal in a vertical blank period of the first frame, and a sensing circuit sensing an electrical characteristic of the second pixel based on the sensing data voltage in the vertical blank period. The recovery data voltage is supplied to the second pixel later than the sensing data voltage. The recovery data voltage supplied to the second pixel in the vertical blank period includes the first and second data voltages.