Storage Voltage Detection for LCD Aperture Ratio and Current Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In liquid crystal display (LCD) apparatuses, the four-mask method increases the distance between the pixel electrode and the data line due to an active layer protrusion, leading to increased parasitic capacitance and decreased aperture ratio.
Innovation Solution
A method for detecting storage voltage is developed, where a test voltage is applied to the storage line, and the active layer's state is determined based on current consumption changes, allowing the storage voltage to be set to maintain the active layer in an inactive state, thereby reducing parasitic capacitance and increasing the aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the four-mask method is used to form the data line and active layer using one mask, then the manufacturing process is simplified, but the active layer protrudes to the outline of the data line, increasing the distance between the pixel electrode and data line, which increases parasitic capacitance and decreases aperture ratio
Solution Approach 1:
The patent applies a storage voltage to the storage line to change the electrical state of the active layer, transforming it from an active (conductive) state to an inactive (non-conductive) state. This parameter change in voltage level resolves the contradiction by allowing the simplified four-mask manufacturing process to be used while preventing the active layer protrusion from creating harmful parasitic capacitance, thereby maintaining the aperture ratio.
2Ease of manufacture
If the active layer is allowed to protrude to the data line outline, then the manufacturing process is easier, but parasitic capacitance between the pixel electrode and data line increases
Solution Approach 1:
By changing the voltage parameter applied to the storage line, the active layer's electrical conductivity is modified. The storage voltage renders the active layer inactive, effectively eliminating its conductive properties in the protrusion region. This resolves the contradiction by allowing the easy four-mask manufacturing process while preventing parasitic capacitance generation.
3Reliability
If a higher storage voltage is applied to the storage line, then the active layer is more effectively kept inactive, but current consumption increases
Solution Approach 1:
The patent employs a feedback mechanism where the storage voltage is adjusted based on detected values. The system detects the appropriate storage voltage level and applies it to the storage line, ensuring the active layer remains inactive while optimizing current consumption. This resolves the contradiction by finding the optimal voltage level that maintains reliability without excessive energy use.
Data Source
AI summary
A method for detecting a storage voltage, a display apparatus using the storage voltage and a method for driving the display apparatus. The method for detecting the storage voltage includes applying a test voltage to a storage line in a display panel having an active layer disposed between the storage line and a data line while varying the test voltage, the active layer being in an active state or an inactive state according to the test voltage, and detecting the storage voltage corresponding to the test voltage in an inactive state of the active layer. Thus, the display panel is driven by using the detected storage voltage, so that an aperture ratio may be increased and current consumption may be decreased.