Electroluminescent Display Timing to Reduce Luminance Deviation
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Solution Overview
Problem
Existing electroluminescent display devices suffer from luminance deviations due to the application of black data insertion (BDI) techniques, which can lead to non-uniform luminance across the display panel.
Innovation Solution
The display device incorporates a timing controller that divides the operation into emission and non-emission periods, allowing data voltage input during the non-emission period and simultaneous light emission during the emission period, with compensation for voltage changes to ensure uniform luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If black data insertion (BDI) technique is applied to improve picture quality, then image quality is improved, but luminance deviation occurs in the display panel area
Solution Approach 1:
The patent applies preliminary action by dividing the operation into emission and non-emission periods, and by sequentially inputting data voltage to all pixel lines during the non-emission period before simultaneous light emission during the emission period. This preliminary data input ensures that all pixels are ready to emit light uniformly, preventing luminance deviation while maintaining picture quality improvement from BDI technique
Solution Approach 2:
The patent implements periodic action by dividing the operation into distinct emission and non-emission periods. During the non-emission period, data voltage is sequentially input to all pixel lines, and during the emission period, all pixels simultaneously emit light. This periodic structure ensures uniform luminance across the display panel while applying BDI technique for picture quality improvement
2Productivity
If data voltage is sequentially input to all pixel lines, then data writing is completed, but luminance deviation occurs due to non-simultaneous emission
Solution Approach 1:
The patent applies preliminary action by completing data voltage input to all pixel lines during the non-emission period before initiating simultaneous light emission during the emission period. This ensures that all pixels receive their data voltage in advance, allowing sequential data writing to be completed while maintaining uniform luminance across the display panel
Solution Approach 2:
The patent implements periodic action by dividing the operation into distinct emission and non-emission periods. During the non-emission period, data voltage is sequentially input to all pixel lines, and during the emission period, all pixels simultaneously emit light. This periodic structure ensures uniform luminance across the display panel while applying BDI technique for picture quality improvement
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach prevents or reduces luminance deviation by ensuring all pixel lines emit light simultaneously, maintaining uniform luminance and improving picture quality.
Implementation Method 1
an electroluminescent display device includes a display panel including a plurality of pixels each having a light emitting element
Data Source
AI summary
An electroluminescent display device includes a display panel including a plurality of pixels each having a light emitting element and a driving thin film transistor for controlling a driving current flowing through the light emitting element and connected to a data line and a gate line, a panel driver connected to the data line and the gate line, and a timing controller configured to control an operation of the panel driver such that the operation is divided into an emission period in which the light emitting element emits light and a non-emission period in which light emission is stopped and to perform control such that a data voltage is input through the data line during the non-emission period and light emitting elements to which the data voltage is applied simultaneously emit light during the emission period.