Block Driving Scan Signal Timing for Display Luminance Uniformity
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Solution Overview
Problem
Current light-emitting display technologies face challenges in securing sufficient sensing and compensating times during image display driving, leading to degraded image quality due to degradation of light-emitting elements and driving transistors, and result in luminance non-uniformity and deviations within and at block boundaries.
Innovation Solution
A light-emitting display device with a display panel featuring subpixels, driving transistors, and storage capacitors, utilizing block driving methods where subpixels are grouped into blocks, with concurrent or sequential supply of scan signals to prevent luminance non-uniformity and deviations by controlling scan signal periods and voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If block driving is implemented to secure sensing and compensating times, then sensing and compensating times are secured, but luminance non-uniformity occurs within and at block boundaries
Solution Approach 1:
The display panel is divided into multiple blocks, each containing multiple subpixels. By grouping subpixels into blocks and driving them independently with separate scan signal supply periods, the patent enables parallel sensing and compensating operations within each block, thereby securing sufficient sensing and compensating times while maintaining overall display performance
Solution Approach 2:
Different scan signal supply strategies are applied to different blocks. The patent controls the scan signal supply periods and voltages locally for each block, allowing optimization of sensing and compensating operations in each block while preventing luminance non-uniformity at block boundaries through coordinated control
2Productivity
If scan signals are supplied concurrently to multiple scan lines, then sensing and compensating operations are accelerated, but luminance deviations occur at block boundaries
Solution Approach 1:
The patent employs periodic scan signal supply with distinct first and second supply periods for each block. During the first supply period, scan signals are supplied to enable sensing and compensating operations. During the second supply period, scan signals are supplied again to ensure proper timing and prevent luminance deviations at block boundaries
Solution Approach 2:
The patent performs sensing and compensating operations during the first scan signal supply period before the actual display operation. This preliminary action ensures that characteristic values are sensed and compensated in advance, allowing for proper timing coordination and preventing luminance deviations at block boundaries
Data Source
AI summary
A light-emitting display device and a method of driving the same including scan signals having a turn-on level voltage concurrently supplied to N scan lines of a plurality of scan lines during a first supply period in which the scan signals having a turn-on level voltage are supplied first, for each of the N scan lines corresponding to N subpixel lines included in each of M blocks into which subpixels are grouped, the scan signals having a turn-on level voltage may be supplied to the N scan lines during a second supply period for each of the N scan lines, in which the scan signals having a turn-on level voltage are supplied second, and time intervals of the N scan lines between the first supply period and the second supply period may be the same or have a difference within a preset range, thereby not only securing sensing and compensating times during driving of an image display through block driving, but also preventing luminance non-uniformity during the block driving.