Dual Horizontal Drive Circuits for Narrower LCD Frame
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Solution Overview
Problem
Existing liquid crystal display devices face challenges in reducing power consumption, particularly in the standby mode, and achieving a narrower frame due to the complexity and layout requirements of horizontal drive circuits, which hinder the miniaturization of mobile terminals.
Innovation Solution
The implementation of a dual horizontal drive circuit system, where each circuit handles different color data in a time-division manner, allowing for separate processing and output of R, G, and B data, reducing the number of required circuits and layout area, and eliminating the need for connecting reference voltage lines, thereby enabling a narrower frame and lower power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If traditional horizontal drive circuits are used to drive display lines, then the display can be driven properly, but the frame width increases and power consumption increases
Solution Approach 1:
The patent divides the horizontal drive circuits into two separate circuits: a first horizontal drive circuit for driving odd-numbered data lines and a second horizontal drive circuit for driving even-numbered data lines. This segmentation allows each circuit to be simpler and smaller, reducing the overall frame width while maintaining proper display drive functionality.
Solution Approach 2:
The patent merges the functions of multiple sampling latch circuits into a single shared sampling latch circuit that serves both horizontal drive circuits. This combining approach reduces the total number of circuits required, simplifies the layout, and enables a narrower frame width without compromising the drive capability.
2Measurement precision
If multiple sampling latch circuits are provided for each data line, then data can be sampled accurately, but the layout area increases and frame becomes wider
Solution Approach 1:
The sampling latch circuit is designed with multi-functionality to serve both the first and second horizontal drive circuits. A single sampling latch circuit can sample data for odd-numbered lines and even-numbered lines sequentially, eliminating the need for separate sampling latch circuits for each drive circuit and significantly reducing the layout area.
3Reliability
If reference voltage lines are connected between horizontal drive circuits, then voltage stability is maintained, but the layout becomes more complex and frame width increases
Solution Approach 1:
The patent provides separate reference voltage generation circuits for the first and second horizontal drive circuits, eliminating the need for connecting reference voltage lines between the two circuits. Each circuit generates its own reference voltages independently, which simplifies the layout and reduces frame width while maintaining voltage stability through dedicated reference voltage generation.
Data Source
AI summary
A display device and mobile terminal are provided. The display device can narrow the pitch, narrow the frame, and further reduce power consumption. The display device includes a display area; a vertical drive circuit; a first horizontal drive circuit converting input first and second digital image data to analog image signals, and supplying the same to a data line selected by the vertical drive circuit; and a second horizontal drive circuit converting input third digital image data to an analog image signal, and supplying the same to a data line selected by the vertical drive circuit. The first horizontal drive circuit includes a sampling latch circuit, a second latch circuit, a digital/analog conversion circuit, and a line selector for selecting the first and second digital image data in a time division manner in a predetermined period and outputting the same to the data line.