Display Device Subpixel Drive Frequency Optimization
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Solution Overview
Problem
In OLED display devices, the drive frequencies of data lines connecting to green and blue subpixels being the same can lead to insufficient charge in subpixel circuits, resulting in decreased luminance, particularly for blue subpixels which have low luminous efficiency.
Innovation Solution
The display device is configured with subpixels connected to different scanning and data signal lines, where the drive frequencies and timing of data signal lines are adjusted to ensure adequate charging of subpixels emitting red, blue, and green light, with specific arrangements of light-emitting layers and connections to data signal lines to reduce luminance shifts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If data lines connecting to green and blue subpixels use the same drive frequency, then the circuit design is simplified, but the charge of blue subpixel circuits becomes insufficient and luminance decreases
Solution Approach 1:
The patent applies parameter changes by differentiating the drive frequencies of data lines for different color subpixels. Specifically, data lines for blue subpixels are driven at a different frequency than those for green subpixels, allowing optimized charging time for the low luminous efficiency blue subpixels while maintaining overall system performance
Solution Approach 2:
The patent implements local quality by applying different drive frequency parameters to different groups of data lines based on the specific requirements of each color subpixel. Blue subpixel data lines receive specialized frequency treatment to ensure adequate charging, while green and red subpixel lines operate under different conditions
2Ease of operation
If blue subpixels are driven at the same frequency as green subpixels, then the driving control is simplified, but the charge accumulation becomes insufficient leading to luminance degradation
Solution Approach 1:
The patent changes the drive frequency parameter for blue subpixel data lines to ensure adequate charge accumulation. This frequency differentiation allows blue subpixels to accumulate sufficient charge for stable luminance output, addressing the reliability issue while maintaining manageable driving control through systematic frequency assignment
3Ease of manufacture
If all subpixels use uniform drive frequencies, then the manufacturing and control processes are simplified, but low luminous efficiency subpixels cannot achieve adequate charge
Solution Approach 1:
The patent applies parameter changes by assigning different drive frequencies to data lines based on the luminous efficiency characteristics of connected subpixels. This approach optimizes charge accumulation efficiency for low efficiency blue subpixels while keeping the overall manufacturing and control processes relatively simple through systematic frequency differentiation
Data Source
AI summary
A display device includes five light-emitting layers including four light-emitting layers arranged in two rows and two columns, and one light-emitting layer diagonally adjacent to each of the four light-emitting, layers, wherein three subpixel circuits corresponding to the one light-emitting layer and two light-emitting layers adjacent in a row direction among the five light-emitting layers are connected to an identical scanning signal line, and four subpixel circuits corresponding to the one light-emitting layer and three light-emitting layers diagonally adjacent to the one light-emitting layer among the five light-emitting layers are connected to four different data signal lines.