Gate Pulse Modulator for Flat Display Luminance Uniformity
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Solution Overview
Problem
Conventional flat displays experience non-uniform luminance in the perpendicular direction due to voltage differences in gate drive signals caused by large resistance in wire-on-array connections, leading to oblique cutoff voltages with varying slopes.
Innovation Solution
A gate output control method and pulse modulator that modulate the gate control signal with an oblique constant-voltage circuit, ensuring the modulated signal remains close to a predetermined voltage, eliminating voltage differences between gate drive signals by employing discharge circuits and constant-voltage power to maintain consistent oblique cutoff voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wire-on-array connections are used to connect gate drive integrated circuits in series, then the display can be controlled sequentially, but the large resistance causes voltage attenuation and non-uniform luminance
Solution Approach 1:
The patent changes the voltage parameter by introducing a predetermined voltage value that the modulated gate control signal maintains during the oblique-varying period. This prevents voltage attenuation along the wire-on-array connections, ensuring uniform luminance across all display blocks while preserving sequential control capability
Solution Approach 2:
The patent introduces an intermediary circuit between the gate control signal terminal and the gate drive integrated circuits. This intermediary modulates the gate control signal to maintain constant voltage during transmission, compensating for the resistance effect in the wire-on-array connections and eliminating luminance non-uniformity
2Device complexity
If the gate control signal is transmitted through high-resistance wire-on-array connections, then circuit integration is achieved, but voltage differences cause oblique cutoff voltages to vary, producing horizontal boundaries
Solution Approach 1:
The patent modifies the voltage parameter of the gate control signal by maintaining it at a predetermined voltage level during the oblique-varying period. This parameter change eliminates voltage differences caused by high-resistance connections, ensuring uniform oblique cutoff voltages and consistent luminance across all display blocks
Solution Approach 2:
The patent creates equipotential conditions by ensuring the modulated gate control signal maintains a constant predetermined voltage throughout transmission. This eliminates potential differences along the wire-on-array connections, preventing horizontal boundaries and achieving uniform illumination intensity
Data Source
AI summary
A gate output control method is adapted into a flat display having a plurality of gate drive integrated circuits. The method comprises: providing a gate control signal; providing a oblique control signal to oblique modulate the gate control signal for generating a gate control signal with oblique; modulating the gate control signal with oblique to obtain a modulated gate control signal; and outputting the modulated gate control signal to the gate drive integrated circuits. A falling edge of the modulated gate control signal comprises a oblique-varying period and a vertical-varying period. In the oblique-varying period, the modulated gate control signal firstly changes to a predetermined voltage in a first slope, and then changes in a second slope until the vertical-varying period. In the vertical-varying period, the modulated gate control signal changes vertically or nearly vertically.