Display Data Driver With Reference Voltage for Luminance Accuracy
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Solution Overview
Problem
As pixel density increases in display devices, the dynamic range of data voltage decreases, leading to reduced luminance accuracy due to variations in data voltage, necessitating a solution to expand the dynamic range.
Innovation Solution
A data driver that selectively outputs a data voltage or a reference voltage through a source channel, utilizing a pixel structure with capacitors and transistors to stabilize the voltage offset, minimizing luminance deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pixel density increases, then display resolution is improved, but dynamic range of data voltage decreases
Solution Approach 1:
The data driver is divided into multiple data line drivers, each responsible for driving a specific data line. This segmentation allows each driver to independently manage voltage levels, effectively expanding the dynamic range for high pixel density displays without compromising resolution
Solution Approach 2:
The patent changes the voltage level parameters by introducing a reference voltage that is different from traditional ground or power supply voltages. This parameter change enables broader data voltage dynamic range, allowing accurate luminance control even at high pixel densities
2Measurement precision
If pixel density increases, then display resolution is improved, but luminance accuracy decreases
Solution Approach 1:
The patent implements a feedback mechanism where the data line driver receives feedback signals about the actual voltage levels on data lines. This feedback allows the driver to adjust output voltages to compensate for variations, maintaining luminance accuracy despite high pixel density
Solution Approach 2:
By introducing adjustable voltage parameters and reference voltages, the system can dynamically optimize voltage levels for each pixel, ensuring accurate luminance control even when pixel density is increased
3Manufacturing precision
If data voltage dynamic range is expanded, then luminance accuracy is improved, but device complexity increases
Solution Approach 1:
The data line driver is designed with multi-functionality, serving as both a voltage generator and a voltage regulator. This universal design expands the dynamic range and improves luminance accuracy without requiring separate dedicated circuits, thereby limiting the increase in device complexity
Data Source
AI summary
A display device includes: a display panel including a sub-pixel, the sub-pixel including: a first capacitor; a first transistor to generate a driving current, and including a control electrode connected to the first capacitor; a second transistor connected to the first capacitor, and to provide a data voltage or a reference voltage to the first capacitor in response to a write gate signal; and a light emitting element to receive the driving current to emit light; a data driver to selectively output the data voltage or the reference voltage to the first capacitor through a source channel; and a timing controller to control the data driver.