OCB LCD Driving Method for Luminance and Response Speed
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Solution Overview
Problem
Color filter-less liquid crystal display (LCD) apparatuses face challenges in achieving high luminance due to reduced light transmittance and response time, particularly when using the 4-field driving method, which decreases the time interval for white data and affects the charging and response speed of liquid crystal molecules.
Innovation Solution
The implementation of a 4-field driving method with an optical compensated birefringence (OCB) mode liquid crystal layer, where a longer field time interval is allocated for white data, and the use of RGBW data emission, with specific timing for red, green, blue, and white light beams to enhance luminance, while ensuring the liquid crystal molecules maintain a bend alignment state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a 4-field driving method is used in a color filter-less LCD apparatus, then color breaking is reduced, but the charging time and response time of liquid crystal molecules are decreased
Solution Approach 1:
The patent applies periodic action by implementing a 4-field driving method that sequentially displays red, green, blue, and white fields in periodic cycles. This periodic driving approach reduces color breaking by providing sufficient time for liquid crystal molecules to respond to each color field while maintaining overall display quality through rhythmic alternation of color fields.
Solution Approach 2:
The patent employs parameter changes by adjusting the field time interval allocation, specifically extending the white field time interval while proportionally reducing other color field intervals. This parameter adjustment optimizes the balance between reducing color breaking and maintaining sufficient charging time for liquid crystal molecules to achieve desired luminance characteristics.
2Illumination intensity
If the field time interval for white data is extended to enhance luminance, then light transmittance is improved, but the response time of liquid crystal molecules is reduced
Solution Approach 1:
The patent applies dynamics by implementing adaptive field time interval adjustment based on display content requirements. The white field time interval is dynamically extended when high luminance is needed, while the system compensates by optimizing the timing and sequence of other color fields. This dynamic adjustment allows the display to achieve enhanced luminance while maintaining adequate response characteristics through real-time timing optimization.
3Illumination intensity
If RGBW data emission is used with longer white field interval, then luminance is enhanced, but the time available for red, green, and blue data is reduced
Solution Approach 1:
The patent applies segmentation by dividing the display frame into four distinct field intervals (red, green, blue, white) with optimized time allocations. This segmentation allows each color field to be displayed sequentially with sufficient time for liquid crystal response, while the white field provides enhanced luminance. The segmented approach balances the time distribution among different color data to achieve both high luminance and adequate color display quality.
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 improves the response speed, charging ratio, and transmittance of the OCB mode liquid crystal molecules, resulting in enhanced luminance characteristics for the LCD apparatus.
Implementation Method 1
an optical compensated birefringence (OCB) mode has been suggested in order to improve the viewing angle of the LCD apparatus and the response speed of the LCD apparatus
Data Source
AI summary
A driving section for a liquid crystal display (LCD) panel not requiring color filters supplies the LCD panel with a plurality of first image signals based on an original image signal during a plurality of first, equal-length field intervals of a frame and also provides a second image signal for enhancing luminance during a second field interval that is longer than the first time interval. The 4-field driving method supplies RGBW data so that the field time interval for a white data is assured thereby improving response speed, charging ratio and transmittance of the liquid crystal molecules.