Display Panel Power Voltage Compensation for Emission Reliability
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Solution Overview
Problem
Display devices face challenges in maintaining emission reliability due to variations in voltage levels and leakage currents, which affect the visibility and longevity of pixel performance.
Innovation Solution
The display device incorporates a voltage drop block with a voltage drop element, such as a transistor or diode, to generate a compensated power voltage lower than the high power voltage, reducing voltage dispersion and maintaining consistent voltage levels across pixels, thereby enhancing emission reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high power voltage is applied to pixels, then emission intensity is improved, but voltage dispersion and leakage current effects worsen
Solution Approach 1:
A voltage drop element (transistor or diode) is introduced as an intermediary component between the high power voltage source and the pixels. This voltage drop element acts as a mediator that converts the high power voltage into a compensated power voltage with lower, more stable voltage levels, thereby reducing voltage dispersion and leakage current effects while maintaining sufficient emission intensity
Solution Approach 2:
The patent changes the voltage parameter by introducing a voltage drop element that reduces the power voltage level. By adjusting the voltage drop characteristics of the transistor or diode, the system optimizes the voltage level delivered to pixels, transforming the high power voltage into a compensated voltage that balances emission intensity with reliability
2Reliability
If voltage levels are compensated using a voltage drop element, then emission reliability is improved, but device complexity increases
Solution Approach 1:
The voltage drop element is designed to serve multiple functions simultaneously: it acts as a voltage regulator to provide compensated power voltage, serves as a current limiting component to reduce leakage current effects, and functions as a protective element against voltage dispersion. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity
Data Source
AI summary
A display device includes a display panel including a plurality of pixels, a gate driver configured to output a gate signal to the pixels, a data driver configured to apply a data voltage to the pixels and a voltage generator configured to output a compensated power voltage to the pixels. The pixels are connected to a compensated power voltage line. The voltage generator includes a high power voltage generating block configured to output a high power voltage to a voltage drop block and the voltage drop block, which outputs the compensated power voltage lower than the high power voltage to the compensated voltage line.