Field Sequential Display Update Cycle Reduction
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Solution Overview
Problem
Field sequential displays, such as FLCOS, perform numerous update cycles for each grayscale level, leading to power inefficiency and increased memory access, especially in battery-powered devices like cellular telephones, as they typically execute one update cycle for each of the 128 grayscale levels in a 7-bit scheme, regardless of the actual pixel values in a subframe.
Innovation Solution
Implementing a subframe analyzer to identify the maximum and minimum grayscale values in a subframe, limiting update cycles to only those within the statistical range of actual pixel values, thereby reducing unnecessary updates and conserving power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If update cycles are performed for all 128 grayscale levels in a 7-bit scheme, then complete grayscale coverage is achieved, but power consumption increases and memory access frequency increases
Solution Approach 1:
The patent applies partial action by performing update cycles only for the necessary range of grayscale values present in each subframe, rather than executing all 128 possible update cycles. The subframe analyzer identifies the actual minimum and maximum grayscale values, and update cycles are limited to this statistical range, eliminating unnecessary partial update cycles while maintaining complete coverage of displayed grayscale values.
2Measurement precision
If update cycles are performed for all 128 grayscale levels in a 7-bit scheme, then complete grayscale coverage is achieved, but memory access frequency increases
Solution Approach 1:
The patent reduces memory access frequency by performing update cycles only for the actual grayscale range present in each subframe. The subframe analyzer determines the minimum and maximum grayscale values, and memory is accessed only during these necessary update cycles rather than during all 128 possible grayscale levels, improving memory access efficiency while maintaining complete grayscale coverage.
3Measurement precision
If all update cycles are executed regardless of actual pixel values, then grayscale accuracy is maintained, but power inefficiency occurs in battery-powered devices
Solution Approach 1:
The patent maintains grayscale accuracy by performing update cycles for the complete statistical range of actual pixel values in each subframe while eliminating unnecessary update cycles for grayscale levels not present in the displayed image. This partial action approach preserves all visually relevant grayscale information while reducing power consumption in battery-powered devices by avoiding redundant update cycle execution.
4Use of energy by moving object
If the number of update cycles is reduced, then power consumption decreases, but display accuracy may be affected
Solution Approach 1:
The patent reduces power consumption while maintaining display accuracy by dynamically adjusting the number of update cycles based on the actual grayscale range present in each subframe. The subframe analyzer identifies the minimum and maximum grayscale values, and update cycles are performed only for this statistical range, ensuring all displayed grayscale values are accurately represented while eliminating unnecessary update cycles that would not contribute to display accuracy.
Solution Approach 2:
The patent uses feedback from the subframe analyzer to dynamically determine the appropriate number of update cycles for each subframe. By analyzing the actual pixel values and identifying the statistical range of grayscale values present, the system adjusts the update cycle count in real-time, ensuring display accuracy is maintained while optimizing power consumption based on the actual content being displayed.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach results in significant power savings, up to 35% in low-light scenarios and 8% in high-light scenarios, without affecting the display's appearance, by minimizing memory accesses and control logic operations.
Implementation Method 1
field sequential display using a ferroelectric liquid crystal on silicon (FLCOS) pixel array
Implementation Method 2
ferroelectric liquid crystal on silicon (FLCOS) pixel array
Implementation Method 3
Some of these displays have been configured for illumination by LEDs
Data Source
AI summary
A controller and method have been described for use in conjunction with a sequential display system including a display having a plurality of pixels. A series of update cycles is performed on the display to establish the grayscale value of each pixel for viewing on the display based on the pixel values for a video frame by selectively switching each pixel responsive to the update cycles such that a total number of the update cycles is less than the total number of pixel values of the frame. Statistical characterization of frame data can be the basis of the reduction of the number of update cycles.