Ternary Addressable Select Scanner for LCD Uniformity
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Solution Overview
Problem
Vertical scanning in LCDs faces challenges with voltage leakage during line copying, causing rows written later to appear lighter than those written earlier due to stored video voltage changes on column capacitance.
Innovation Solution
Implementing a ternary addressing scheme that allows multiple rows to be turned on simultaneously, using trits in the address to ensure all rows have the same voltage and no difference in appearance, combined with row addressable driving and masking to manage bit positions effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If line copying function is used to write the same data to multiple rows sequentially, then writing efficiency is improved, but voltage leakage on column capacitance causes later rows to appear lighter than earlier rows
Solution Approach 1:
The patent applies periodic action by enabling multiple rows simultaneously through ternary addressing rather than sequential row-by-row writing. This allows all selected rows to receive data at the same time period, eliminating the time-dependent voltage leakage effect that causes brightness differences between rows written at different times.
Solution Approach 2:
The patent merges multiple row selection operations into a single simultaneous operation using ternary addressable scanners. Instead of selecting rows one after another, the system combines multiple row selections into one unified addressing operation, allowing all rows to be written simultaneously with the same voltage level.
2Manufacturing precision
If multiple rows are turned on simultaneously using ternary addressing, then image uniformity is improved, but device complexity increases due to ternary decoder requirements
Solution Approach 1:
The patent implements universality by designing a ternary addressable scanner that can perform both traditional sequential row selection and simultaneous multi-row selection functions. The same addressing system handles both operating modes, eliminating the need for separate hardware systems for different selection methods.
Solution Approach 2:
The patent applies parameter changes by transitioning from binary addressing (one row per address) to ternary addressing (multiple rows per address). This fundamental parameter change in the addressing system enables simultaneous row selection while maintaining a systematic and manageable complexity level through mathematical encoding.
3Device complexity
If sequential row selection is used, then device complexity is reduced, but writing time increases due to row-by-row processing
Solution Approach 1:
The patent uses periodic action by enabling multiple rows simultaneously through ternary addressing rather than sequential row-by-row writing. This allows all selected rows to receive data at the same time period, eliminating the time-dependent voltage leakage effect that causes brightness differences between rows written at different times.
Data Source
AI summary
A method of writing image data to a pixel array includes decoding an address and activating, based on the decoded address, two or more row selection signals. The address may be a ternary address having at least one trit. The method further includes providing the two or more row selection signals to the pixel array to select two or more rows of the pixel array, the activation of which writes the image data to pixels in the two or more rows of the pixel array.