LCD Driving Circuit Segmentation for Power and Cross-Talk Reduction
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Solution Overview
Problem
Liquid crystal display (LCD) devices using the dot inversion method for improving contrast suffer from high power consumption due to the need for greater individual pixel voltages and electrical cross-talk issues in line and column inversion methods, which do not provide sufficient contrast enhancement.
Innovation Solution
A display panel driving circuit with an additional data line and alternating data signal polarities between adjacent lines, employing a timing controller to shift sub-pixel data and manage signal polarities, reducing power consumption while maintaining superior image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If dot inversion method is used to improve contrast, then image quality is superior, but power consumption increases due to greater individual pixel voltages
Solution Approach 1:
The patent divides the display panel into multiple banks, with each bank having its own data line. By segmenting the data lines and applying different inversion patterns to different banks, the system achieves dot inversion quality while reducing overall power consumption through localized polarity management.
Solution Approach 2:
Different regions (banks) of the display panel are assigned different data line polarity configurations. Some banks use even polarity while others use odd polarity, allowing local optimization of power consumption while maintaining overall image quality through selective application of inversion benefits where needed.
2Use of energy by moving object
If line inversion or column inversion is used to reduce power consumption, then power consumption decreases, but electrical cross-talk occurs and contrast improvement is insufficient
Solution Approach 1:
The display panel is divided into multiple banks with separate data lines, isolating electrical signals from each other. This segmentation prevents electrical cross-talk between adjacent lines while still allowing inversion methods to be applied within each bank for power consumption reduction.
Solution Approach 2:
The patent introduces an additional data line that acts as an intermediary to manage polarity transitions. This additional line facilitates smooth polarity switching between banks without causing electrical cross-talk, enabling safe application of inversion methods.
3Use of energy by moving object
If additional data line is added to manage polarities, then power consumption is reduced while maintaining image quality, but device complexity increases
Solution Approach 1:
The additional data line serves multiple functions: it manages polarity transitions, separates banks, and enables inversion patterns. By making this line multi-functional, the patent reduces the need for even more additional components, thereby limiting the increase in device complexity while achieving power consumption reduction.
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
The solution achieves superior image quality while significantly reducing electrical power consumption by optimizing data signal management and polarities in the LCD driving circuit.
Implementation Method 1
an orientation of molecules of liquid crystal material provided within the liquid crystal cell, between the pixel and common electrode, may be altered and the light transmittance of the liquid crystal cell may be controlled
Data Source
AI summary
A driving circuit for driving a display panel comprising: (i) a printed circuit board, (ii) an input interface to receive input video signal, (iii) a timing controller to control timing signal for the display panel, (iv) a plurality of first source drivers, and (v) at least one second source driver, and wherein the display cells connected to the i-th data line and the (2j+1)-th or (2j+2)-th gate line, where j=0, 2, 4, . . . , <[Y/2], and i=1, 2, . . . , M, where Y and M are positive integers, receive data signals from corresponding data lines 1 through M, respectively, and the display cells connected to the (i+1)-th data line and the (2j+1)-th or (2j+2)-th gate line, where j=1, 3, . . . , <[Y/2]+1, and i=1, 2, . . . , M, receive shifted data signals from the data lines 2 through M+1, respectively.