OLED Data Driver Gamma Voltage Lookup Table
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In organic light-emitting display apparatuses, the use of a single low voltage ELVSS and initialization voltage Vini2 for all gamma sets leads to potential issues such as stain or leakage of black voltage, particularly at black voltage and low gray voltage operations, resulting in suboptimal image quality.
Innovation Solution
A data driver with a lookup table that sets and selects optimized low voltage ELVSS and initialization voltage Vini2 corresponding to each gamma set based on luminance data, ensuring precise voltage allocation for improved image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single low voltage ELVSS and initialization voltage Vini2 are used for all gamma sets, then the device complexity is reduced, but image quality deteriorates due to stain or leakage of black voltage
Solution Approach 1:
The patent divides the voltage supply system into multiple segmented voltage levels corresponding to different gamma sets. Instead of using a single low voltage ELVSS for all gamma sets, the system creates separate voltage selections (e.g., ELVSS1, ELVSS2, ELVSS3) matched with specific gamma sets (Gamma1, Gamma2, Gamma3). This segmentation allows each gamma set to have its own optimized voltage parameters, eliminating voltage leakage and stain issues while maintaining manageable system complexity through structured organization.
Solution Approach 2:
The patent applies local quality by assigning different voltage characteristics to different gamma sets based on their specific requirements. Each gamma set receives customized voltage parameters (ELVSS and Vini2) tailored to its luminance characteristics. For example, Gamma1 uses specific voltage values optimized for its luminance range, while Gamma2 and Gamma3 have different voltage values suited to their respective ranges. This localized optimization ensures optimal image quality for each gamma set without compromising overall system performance.
2Ease of operation
If representative values of low voltage ELVSS and initialization voltage Vini2 are applied collectively, then the ease of operation is improved, but reliability deteriorates due to black voltage stain or leakage
Solution Approach 1:
The patent implements preliminary action by pre-configuring and storing optimized voltage values (ELVSS and Vini2) for each gamma set in advance. The system includes lookup tables or storage structures that contain predetermined voltage combinations corresponding to different gamma sets. When a gamma set is selected, the system automatically retrieves and applies the pre-optimized voltage values without requiring real-time calculation or complex configuration. This preliminary preparation ensures reliable black voltage stability while maintaining ease of operation through automated voltage selection.
3Adaptability or versatility
If multiple gamma sets with different optimal voltages are supported, then the adaptability is improved, but device complexity increases due to multiple voltage selections
Solution Approach 1:
The patent applies universality by designing a unified voltage management framework that handles multiple gamma sets through a common structure. The system uses a universal lookup table or storage mechanism that contains voltage configurations for all gamma sets, and a unified selection mechanism that automatically retrieves appropriate voltages based on the selected gamma set. This multi-functional approach allows the system to support multiple gamma sets (Gamma1, Gamma2, Gamma3) with different voltage requirements while maintaining a consistent and manageable architecture, thereby improving adaptability without proportionally increasing complexity.
Data Source
AI summary
Disclosed are a display apparatus and a method for selecting a gamma power in which when selecting a gamma set corresponding to each luminance in an organic light emitting (OLED) display apparatus, a low power voltage and an initial voltage corresponding thereto are selected, and are provided to a display panel, thereby optimizing a black voltage and a driving voltage. To this end, the display apparatus includes a data driver which sets the low voltage and the initialization voltage corresponding to each gamma set and stores the same into a lookup table. Therefore, the low power voltage and the initialization voltage are changed only by selecting the gamma set. The display apparatus is suitable for operating at a black voltage and a low gray voltage.