LCD Storage Capacitor Connection to Gate Line
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Solution Overview
Problem
Liquid crystal display (LCD) devices face the challenge of the white flash phenomenon due to unintentional charging of the storage capacitor, which increases manufacturing costs and complexity, particularly with the use of amorphous silicon doping.
Innovation Solution
A method and structure for an LCD that eliminates the need for doping by connecting the storage capacitor to an adjacent gate line, using a gate driver to generate gate-on and gate-off voltages through multi-stage boosting and decompression, respectively, to prevent the white flash phenomenon.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If amorphous silicon doping is used to charge the storage capacitor, then the storage capacitor can be charged using common voltage, but manufacturing cost increases and manufacturing process becomes complex
Solution Approach 1:
The patent extracts and removes the doping process from the manufacturing sequence. Instead of doping amorphous silicon to create conductive paths for charging the storage capacitor, the invention uses a pre-charged capacitor approach where the storage capacitor is charged during the gate voltage generation process itself, eliminating the need for separate doping steps and masks.
Solution Approach 2:
The storage capacitor is charged in advance during the gate voltage generation process before the actual display operation begins. The gate driver circuit charges the storage capacitor using the generated gate voltage, ensuring it is ready for maintaining voltage without requiring complex doping processes during manufacturing.
2Reliability
If storage capacitor is charged using common voltage with doped amorphous silicon, then voltage maintenance is achieved, but white flash phenomenon occurs during charging
Solution Approach 1:
The storage capacitor is charged in advance during the gate voltage generation process before the display operates. By pre-charging the capacitor using the gate driver circuit's generated voltage rather than applying common voltage during operation, the invention prevents the white flash phenomenon while maintaining voltage stability.
Solution Approach 2:
The gate driver circuit acts as an intermediary between the power supply and the storage capacitor. Instead of directly applying common voltage to charge the storage capacitor (which causes white flash), the gate driver circuit generates appropriate gate voltages and uses these as intermediaries to charge the storage capacitor, thereby preventing harmful effects.
3Object-affected harmful factors
If multi-stage boosting is used to generate gate-on voltage, then white flash phenomenon is prevented, but device complexity increases
Solution Approach 1:
The gate voltage generation process is segmented into multiple stages: first generating a first gate voltage, then generating a second gate voltage based on the first, and finally generating the gate-on voltage based on the second. This segmentation allows gradual voltage buildup that prevents white flash while distributing the complexity across manageable stages rather than requiring a single complex circuit.
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 reduces the white flash phenomenon by controlling the potential difference in the liquid crystal capacitor, simplifies the manufacturing process, and eliminates the need for amorphous silicon doping, thereby reducing costs and complexity.
Implementation Method 1
a gate driver for generating a gate-on voltage by boosting a first input voltage in multi-stages
Implementation Method 2
an arrangement of liquid crystal molecules of the liquid crystal capacitor Clc is changed according to the potential difference between the pixel electrode and the common electrode, thereby modulating an incident light
Data Source
AI summary
A liquid crystal display device (LCD), and a method of driving the LCD. The LCD includes: a display panel including a plurality of pixels defined as a plurality of gate lines and a plurality of data lines cross each other, wherein a storage capacitor of each of the plurality of pixels is connected to a front or rear gate line; a gate driver for generating a gate-on voltage by boosting a first input voltage in multi-stages, the gate-on voltage turns on a switching device of each of the plurality of pixels, and a gate-off voltage that turns off the switching device, and sequentially applying the gate-on voltage and the gate-off voltage to the plurality of gate lines; and a source driver for applying a data voltage to a data line connected to a pixel whose switching device is turned on.