Partial Display Control Circuit for LCD Power Reduction
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Solution Overview
Problem
Existing liquid crystal display devices with partial display capabilities face challenges in reducing power consumption and manufacturing costs, particularly due to the need for additional ICs and increased complexity in forming driving circuits, which hinders advancements in System on Glass (SOG) technology and narrow frame designs.
Innovation Solution
A liquid crystal display device incorporating a source driver circuit, gate driver circuit, control circuit, receiver circuit, and decoder circuit to output array control signals and decode start and end addresses for partial display, allowing for independent control of gate lines and reduced power consumption by selectively driving only the necessary pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If partial display function is implemented using existing technology, then power consumption is reduced, but manufacturing cost increases and device complexity increases
Solution Approach 1:
The patent merges the receiver circuit and decoder circuit into a single integrated circuit block that receives control signals and generates gate driver control signals. This consolidation reduces the number of separate components needed for partial display functionality, thereby reducing device complexity while maintaining power consumption benefits. The integrated circuit combines address decoding, gate line selection, and control signal generation in one unit.
2Use of energy by moving object
If partial display function is implemented using existing technology, then power consumption is reduced, but manufacturing cost increases
Solution Approach 1:
The patent integrates multiple functions (receiver, decoder, and control signal generator) into a single circuit block that can be fabricated as part of the array substrate using standard TFT processes. This integration eliminates the need for separate IC packages and reduces assembly steps, thereby lowering manufacturing cost while preserving the power consumption advantages of partial display.
Solution Approach 2:
The integrated circuit is designed to handle multiple functions: receiving control signals, decoding start and end addresses, generating gate driver control signals, and supporting various display modes (full display, partial display, mirror display). This multi-functionality reduces the need for specialized components, simplifying manufacturing and reducing costs.
3Adaptability or versatility
If additional ICs are used for partial driving, then partial display capability is achieved, but the number of parts increases
Solution Approach 1:
The patent combines the receiver circuit, decoder circuit, and control signal generation functions into a single integrated circuit block formed on the array substrate. This eliminates the need for separate IC components that would otherwise be required for partial display control, thereby reducing the number of parts while maintaining full partial display capability.
Solution Approach 2:
The receiver and decoder circuits are nested within the array substrate structure, with the integrated circuit formed using the same TFT process as the display pixels. This nesting approach embeds the control functionality within the existing substrate, eliminating external components and reducing part count.
Data Source
AI summary
A liquid crystal display device includes a plurality of pixels arranged on a substrate in a matrix, a source driver circuit to supply source signals to source lines connected to each pixel arranged in a column direction and a gate driver circuit to supply gate signals to respective gate lines connected to pixels arranged in a row direction. A control circuit outputs an array control signal for a partial display to a receiver circuit that receives a partial display start address to specify a gate line for starting a partial display and a partial display end address to specify a gate line for ending the partial display. A decoder circuit outputs a control signal to control a range of the gate lines driven by the gate driver circuit.