Voltage Variation Corrector for Display Panel Brightness Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Large-screen and high-resolution organic light-emitting displays face issues with brightness variations due to output variations between reference voltage generators, which are difficult to control and compensate for effectively in existing compensation methods.
Innovation Solution
A method involving a voltage variation corrector with a multiplexer and correction circuit that extracts and applies correction parameters to minimize voltage variations between reference voltage generators, ensuring uniform reference voltages across multiple sections of the display panel, using a time-division manner or phased approach to maintain consistent brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional compensation methods are used with common reference voltage, then device characteristic variations are compensated, but brightness variations occur between split screens due to reference voltage output variations
Solution Approach 1:
The patent divides the display panel into multiple sections, each with its own reference voltage generator. This segmentation allows independent control and compensation of reference voltage variations in each section, thereby eliminating brightness variations between split screens while maintaining device characteristic compensation.
2Adaptability or versatility
If multiple reference voltage generators are used for large-screen displays, then brightness can be adjusted across sections, but output variations between generators cause brightness non-uniformity
Solution Approach 1:
The patent introduces a feedback mechanism where output voltages from multiple reference voltage generators are sensed and compared. Correction values are generated based on these comparisons and applied to adjust the generators, ensuring their outputs converge to a consistent reference level. This feedback loop eliminates brightness non-uniformity while preserving multi-section brightness control capability.
3Illumination intensity
If reference voltage output variations occur, then brightness variations appear across sections, but existing compensation methods cannot effectively control these variations
Solution Approach 1:
The patent implements a continuous feedback monitoring system that senses output voltages from reference voltage generators, compares them against a target reference voltage, and generates correction values to adjust any deviations. This ensures reliable brightness consistency across all sections while maintaining the ability to control section brightness.
Solution Approach 2:
The patent replaces manual or open-loop reference voltage adjustment with an automated electronic feedback control system. The system automatically senses voltage variations, calculates correction values, and applies adjustments without manual intervention, thereby ensuring reliable brightness consistency and eliminating the inability of existing methods to control reference voltage variations.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present invention provides a display device comprises a display panel displaying an image, M reference voltage generators (M is an integer of 2 or greater) that respectively supply reference voltages to N display areas (N is an integer of 2 or greater) defined on the display panel, and a voltage variation corrector that corrects for voltage variations between the M reference voltages (M is an integer of 2 or greater).