Gamma Voltage Routing for Flat Panel Display SDICs
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Solution Overview
Problem
The uneven power consumption and resulting temperature differences among gamma buffers in source driver integrated circuits (SDICs) in flat panel displays lead to reduced lifetime and reliability, as higher temperatures in some SDICs decrease their performance and increase the risk of defects.
Innovation Solution
A method for routing gamma voltages involves forming routing lines to connect gamma buffers to output terminals, selecting SDICs based on heating values, and adjusting connections to resistor strings to minimize power consumption and temperature differences, including the option to use external gamma buffers to redistribute power and reduce heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If gamma buffers are arranged in a predetermined order according to gamma voltage levels, then the display can achieve proper gamma correction, but the power consumption and temperature of different SDICs become uneven
Solution Approach 1:
The patent applies asymmetry by intentionally creating an asymmetric temperature distribution pattern among SDICs through selective gamma buffer resetting. Instead of treating all SDICs uniformly, the system identifies specific SDICs with abnormally high temperatures and applies resetting operations only to those, creating a targeted asymmetric correction that balances the overall temperature distribution across the display panel.
Solution Approach 2:
The patent changes the operating parameters of selected gamma buffers by resetting them to default values. This parameter change (from customized gamma voltage levels back to default) reduces the power consumption and temperature of specific SDICs that are overheating, thereby achieving more uniform temperature distribution while maintaining display quality through compensatory adjustments in adjacent SDICs.
2Illumination intensity
If gamma buffers operate with customized gamma voltages, then the display achieves proper brightness correction, but the heating values of gamma buffers differ significantly
Solution Approach 1:
The patent implements periodic action by repeatedly monitoring temperature distributions and selectively resetting gamma buffers at different time intervals. The system periodically identifies SDICs with abnormally high temperatures and applies resetting operations in cycles, allowing the display to maintain proper brightness correction while periodically correcting temperature imbalances caused by customized gamma voltage operations.
Solution Approach 2:
The patent employs feedback mechanisms by continuously monitoring the temperature distribution across SDICs and using this information to make intelligent decisions about which gamma buffers to reset. The system feeds back temperature data to the control logic, which then selectively applies resetting operations to specific overheating SDICs, creating a closed-loop control system that balances brightness correction with thermal management.
3Temperature
If all gamma buffers are reset to default values, then temperature differences among SDICs are reduced, but the gamma correction performance deteriorates
Solution Approach 1:
The patent applies local quality by resetting gamma buffers only in specific local regions (individual SDICs) that exhibit abnormally high temperatures, rather than uniformly resetting all gamma buffers across the display. This localized approach allows the system to maintain proper gamma correction accuracy in the majority of SDICs while correcting temperature imbalances only where needed, preserving overall display quality.
Solution Approach 2:
The patent implements partial action by selectively resetting only a subset of gamma buffers that are causing abnormal heating, rather than resetting all gamma buffers. This partial resetting approach is sufficient to correct temperature uniformity issues while minimizing the impact on gamma correction performance, as the majority of gamma buffers continue to operate with their customized voltage levels for proper brightness correction.
Data Source
AI summary
A method for routing gamma voltages in a flat panel display that includes a plurality of source driver integrated circuits (SDICs) each having a plurality of gamma buffers. The method includes forming routing lines to route a plurality of gamma voltages; connecting the routing lines to output terminals of the gamma buffers; applying the reset gamma voltage to the gamma buffer of selected SDIC after selecting the SDIC in which the gamma voltage is required to be reset in consideration of heating values of the SDICs, and changing connection between a routing line corresponding to the selected gamma buffer and a tap point of a resistor string of the SDIC such that the connection corresponds to the reset gamma voltage.