OLED Driving Apparatus Gamma Voltage Surge Protection
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Solution Overview
Problem
Existing OLED display devices experience deviations in display luminance due to gamma setting errors caused by factors like surge voltage and noise, which alter the programmed reference gamma voltage, affecting the accuracy of gray scale data representation.
Innovation Solution
A driving apparatus is designed with a reference gamma voltage generator and data driver that includes a protection unit to delay and control the output of internal voltages, preventing changes in the programmed reference gamma voltage by using MTP control signals, write control signals, and erase control signals to manage bit signals and maintain stable voltage levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multi-time programming is performed to program reference gamma voltage in real time, then display luminance accuracy is improved, but the programmed reference gamma voltage becomes vulnerable to changes due to surge voltage or noise
Solution Approach 1:
A protection unit is introduced beforehand to cushion against surge voltage and noise. This unit includes a delay unit with a capacitor that temporarily stores voltage and a switch that controls voltage transmission, preventing direct impact of voltage spikes on the MTP cell and thus protecting the programmed reference gamma voltage from unintended changes.
Solution Approach 2:
The protection unit acts as an intermediary between the voltage input and the MTP cell. It includes a delay unit with a capacitor that temporarily stores voltage and a switch that controls voltage transmission, preventing direct impact of voltage spikes on the MTP cell and thus protecting the programmed reference gamma voltage from unintended changes.
2Reliability
If protection unit is added to prevent surge voltage and noise, then reference gamma voltage stability is improved, but device complexity increases
Solution Approach 1:
The protection unit is segmented into distinct functional components: a delay unit with a capacitor for voltage storage, and a switch for voltage transmission control. This segmentation allows each component to perform its specific function independently, making the protection mechanism modular and easier to integrate into the existing driving apparatus without overwhelming complexity.
Data Source
AI summary
A driving apparatus for a display device includes: a reference gamma voltage generator configured to generate a reference gamma voltage according to an MTP control signal, a write control signal, and an erase control signal; and a data driver configured to convert a data signal into a data voltage corresponding to the reference gamma voltage. The reference gamma voltage generator includes: a protection unit configured to output a first voltage as a first internal voltage when the MTP control signal is at a first level, and to interrupt the output of the first voltage when the MTP control signal is at a second level; an MTP cell configured to program a bit signal by utilizing the first internal voltage and a second internal voltage according to the write control signal and erase control signal; and a gamma register configured to determine the reference gamma voltage corresponding to the bit signal.