Display Driver Circuit Gamma Sharing for Power Reduction
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Solution Overview
Problem
Current electronic devices face significant power consumption challenges due to the high energy requirements of their displays, particularly when displaying low luminance levels, which can lead to increased battery drain and heat generation.
Innovation Solution
The implementation of a display driving method and a display driver integrated circuit that includes a gamma circuit, source driver, and logic circuit, which allows for the sharing of gamma values and amplifier outputs among sub-pixels, reducing power consumption by activating only necessary components when the display luminance is set to or below a specified value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If all gamma generation units and amplifiers are activated to drive the display at high luminance, then the display brightness is improved, but power consumption increases
Solution Approach 1:
The system dynamically adjusts the number of activated gamma generation units and amplifiers based on the required luminance level. When luminance is set to a specified value or lower, the logic circuit controls switches to activate only one gamma generation unit and a reduced number of amplifiers, making the system adaptable to different operating conditions and reducing power consumption accordingly
Solution Approach 2:
A single gamma generation unit is designed to serve multiple decoders through switchable connections. The output of one gamma generation unit can be routed to multiple decoders via control switches, allowing one unit to perform the function that would normally require multiple dedicated units, thereby reducing overall power consumption while maintaining display functionality
2Measurement precision
If multiple gamma generation units are activated for each sub pixel, then the gamma value accuracy is improved, but device complexity increases
Solution Approach 1:
Multiple decoders are merged to share a common gamma generation unit through switchable connections. The logic circuit controls switches to route the output of a single gamma generation unit to multiple decoders based on luminance requirements, reducing the total number of gamma generation units needed while maintaining the ability to provide accurate gamma values to each decoder when required
3Reliability
If all amplifiers are activated for each sub pixel, then the display output quality is improved, but power consumption increases
Solution Approach 1:
The system dynamically controls the activation state of amplifiers based on luminance settings. The logic circuit activates only the necessary number of amplifiers required to maintain display output quality at the current luminance level, deactivating excess amplifiers to reduce power consumption while preserving display quality when needed
Data Source
AI summary
A method for driving a display and an electronic device supporting the same are provided. The method includes determining a luminance setting of an output of a display panel; generating a gamma value corresponding to at least one sub pixel among sub pixels composing a pixel of the display panel when the luminance setting is equal to or lower than a specified value; and supplying the generated gamma value to the at least one sub pixel and at least one other sub pixel.