Loading Effect Control for OLED Gamma Voltage Stability
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Solution Overview
Problem
Organic light emitting display devices experience voltage drops due to resistance in power supply lines, leading to changes in gamma voltages that degrade display quality, particularly affecting image brightness and grayscale values.
Innovation Solution
A loading effect control device is introduced, comprising a detecting line, a detector, a load controller, and a gamma reference voltage generator. The detector measures the power voltage, calculates the load amount, and the load controller determines a control amount based on the detected load and loading effect settings, which is then used to adjust the gamma reference voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power supply lines are used to provide power voltage to the display panel, then the display panel can operate, but voltage drops occur due to resistance causing gamma voltage changes and degraded display quality
Solution Approach 1:
The patent implements a feedback mechanism where a detector measures the actual power voltage at the display panel, compares it with a reference voltage to determine load amount, and feeds this information back to a load controller. The load controller then adjusts the gamma reference voltage to compensate for voltage drops, ensuring stable display quality despite power supply line resistance.
Solution Approach 2:
The patent dynamically changes the gamma reference voltage parameter based on the detected load amount. By adjusting this voltage parameter in response to measured conditions, the system compensates for voltage drops and maintains consistent gamma voltages across different operating conditions, thereby preserving display quality.
2Manufacturing precision
If the loading effect is not controlled, then the device structure remains simple, but gamma voltages change causing degraded image brightness and grayscale values
Solution Approach 1:
The patent introduces intermediary components (detector, load controller, and gamma reference voltage generator) that mediate between the power supply and the display panel. These intermediaries measure, process, and adjust voltages to ensure stable gamma voltages, accepting the added device complexity as necessary to achieve precise voltage control and maintain manufacturing precision.
3Reliability
If voltage drop compensation is implemented, then display quality improves, but additional control components and circuits are required
Solution Approach 1:
The patent merges the voltage measurement, load detection, and gamma voltage control functions into an integrated control system. By combining these related functions into a unified architecture, the patent reduces the overall complexity compared to having separate independent systems, while still achieving reliable image brightness consistency through coordinated voltage compensation.
Data Source
AI summary
A loading effect control device includes a detecting line, a detector, a load controller, and a gamma reference voltage generator. The detecting line is coupled to a first power supply line in a display panel, and the first power supply line provides a first power voltage. The detector measures the first power voltage in the display panel through the detecting line, detects an amount of load of the display panel, and outputs a first voltage corresponding to the detected amount of the load. The load controller determines a control amount of the load based on the detected load amount and a loading effect setting. The gamma reference voltage generator controls a gamma reference voltage based on the control amount of the load.