Active Matrix Display Driving Method for High Resolution
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional active matrix display devices face limitations in achieving high display resolution or dynamic range due to insufficient scanning speed, where the scan time of one frame often overlaps with the next, leading to concurrent operation of multiple scan lines.
Innovation Solution
A method is introduced to drive active matrix display devices by dividing the image frame into subframes weighted according to bit positions, allowing non-sequential selection of rows in subframes corresponding to lesser significant bits, with each row being selected only once per subframe, and optimizing scan and hold times to enhance scanning efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sequential scanning of all rows is performed in each subframe, then all pixels can be addressed, but the scan time becomes too long to complete before the next frame starts
Solution Approach 1:
The patent segments the scanning process by dividing rows into different groups that can be scanned in parallel across multiple subframes. Instead of scanning all rows sequentially in one subframe, the scan lines are partitioned and distributed across subframes SF0-SF5, allowing concurrent scanning operations that reduce total scan time while maintaining complete pixel addressing.
Solution Approach 2:
The patent introduces a temporal dimension to the scanning process by utilizing multiple subframes (SF0-SF5) with different weights. This transforms the single-dimensional sequential scanning approach into a multi-dimensional scanning scheme where rows are scanned across different time slots (subframes) with varying durations, enabling parallel processing and reduced overall scan time.
2Loss of time
If scanning frequency is increased to reduce scan time, then scan time decreases, but power consumption and signal interference increase
Solution Approach 1:
The patent implements dynamic subframe weighting where different subframes (SF0-SF5) have different durations assigned based on their significance weight. This dynamic approach allows the system to allocate more time to critical scanning operations while compressing less critical ones, optimizing the balance between scan time and power consumption without requiring uniform high-frequency scanning that would increase energy usage.
Solution Approach 2:
The patent changes the temporal parameters of the scanning system by assigning different weight values and durations to different subframes. By varying the subframe duration parameter based on weight (e.g., SF0 having shorter duration, SF5 having longer duration), the system achieves efficient scanning with reduced overall time without the need for uniformly increased scanning frequency that would consume more power.
3Productivity
If multiple scan lines operate concurrently to reduce scan time, then scan speed improves, but signal interference and timing complexity increase
Solution Approach 1:
The patent segments the scan lines into distinct groups associated with different subframes (SF0-SF5), where each group is controlled by dedicated timing signals. This segmentation allows concurrent scanning of different row groups without signal interference, as each segment operates in its designated time slot with isolated control logic, simplifying the overall timing management despite parallel operations.
Solution Approach 2:
The patent employs preliminary timing setup where scan signals for different subframes are pre-configured with specific weights and durations before the scanning process begins. This preliminary action establishes a predetermined scanning pattern that coordinates concurrent scan line operations, reducing timing complexity by having the control system prepared with the exact sequence and duration of each scan segment in advance.
Data Source
AI summary
A method is provided for driving an active matrix display device comprising a matrix of pixels configured to display an n-bit image data in an image frame by dividing the image frame for each pixel into n subframes; defining the n-bit image data to have n1 number of greater significant bits and n2 number of lesser significant bits, where n1+n2=n; and selecting the rows of pixels non-sequentially in the subframes corresponding to the n2 number of lesser significant bits such that there is no more than one row of pixel being selected in each subframe. The provided method can utilize the scan sequence in a more flexible way to make better use of the available scan time such that a higher display resolution or dynamic range can be achieved without increasing the scanning frequency.