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How to custom Front-light for E Ink display?

Categories:FAQ
Author:Engineer Liu
Origin:Original
Time of issue:2024-04-07 21:15
Views:

(Summary description)

How to custom Front-light for E Ink display?

(Summary description)

Categories:FAQ
Author:Engineer Liu
Origin:Original
Time of issue:2024-04-07 21:15
Views:

Information

Custom Front-Light Design Guide

For product design engineers, opting for a custom front-light proves to be the optimal approach for meeting distinctive application requirements. We offer data-driven recommendations and unwavering support throughout the process.

Design Considerations Development Process

Front-light customization demonstration for E-paper displays

Front-Light Design Considerations

Key engineering factors for optimal front-light customization based on application requirements

Dimensions & Thickness

Light Guide Plate (LGP) must be larger than display's active area (AA)
LGP should be slightly smaller than EPD outer dimensions
Typical thickness: 0.4mm (adjustable based on application)
Edge clearance: Minimum 0.5mm on all sides

Optical Treatments

With Touch Screen/Cover Glass: No anti-glare film needed
Without Touch Screen: Anti-glare film recommended
Optional prism films for enhanced brightness
Diffuser layers for uniform light distribution

LED Configuration

Series connection: Better performance (requires boosting circuit)
Parallel connection: Simpler design (no boosting needed)
LED pitch optimization for uniformity
Thermal management considerations

LED Color Options

White LEDs: Cool white (blue bias) or warm white (yellow bias)
RGB LEDs: Full color spectrum with independent control
Color temperature options: 2700K-6500K
High-CRI options for accurate color rendering

FPC Design

Default: 6-pin configuration (1-2: +, 3-4: NC, 5-6: -)
Custom options: 4-pin, 8-pin or other configurations
FPC length and orientation customization
Flexible routing options for complex assemblies

Bonding Techniques

OCA bonding: Minimum thickness 0.175mm
Pressure-sensitive adhesive (PSA) options
Liquid optically clear adhesive (LOCA)
Mechanical mounting solutions

Technical Note

For high-resolution displays, micro-lens array technology can be implemented to enhance light extraction efficiency by up to 40%. This is particularly beneficial for applications requiring low power consumption while maintaining high brightness uniformity.

Recommended LED Quantity by Display Size

Display Size	Recommended LEDs	Typical Power Consumption	Uniformity Target
0.97 inch, 1.02 inch	2 LEDs	0.8-1.2W	>85%
1.54 inch, 2.13 inch, 2.9 inch	3 LEDs	1.2-1.8W	>80%
2.7 inch	4 LEDs	1.8-2.4W	>80%
3.7 inch	5 LEDs	2.5-3.5W	>75%
4.2 inch, 4.26 inch	7 LEDs	3.5-4.5W	>75%
7.5 inch	10 LEDs	6.0-8.0W	>70%

Important Consideration

For displays larger than 7.5 inches, a hybrid edge-lit and direct-lit solution may be necessary to maintain uniform illumination across the entire display surface. This approach combines the thin profile benefits of edge lighting with the uniformity advantages of direct lighting.

Custom Front-Light Development Process

Our proven 5-step methodology ensures successful implementation of your custom front-light solution

Engineering-Driven Approach

Every custom front-light solution begins with a comprehensive analysis of your application requirements, environmental conditions, and performance expectations. Our approach ensures optimal optical performance while maintaining energy efficiency.

Definition

Establishing project parameters and requirements

Problem statement analysis
Application environment assessment
Technical specifications definition
Timeline and milestone planning

Concept

Developing initial design approach

Optical simulations
Preliminary prototyping
Proof-of-concept validation
Feasibility assessment

Design

Engineering the solution

Detailed optical design
Mechanical integration planning
Electrical system design
Thermal management solution

Validation

Testing and refinement

Prototype evaluation
Optical performance testing
Environmental testing
Design refinement iterations

Production

Manufacturing and delivery

Tooling and fixture preparation
Pilot production run
Quality assurance implementation
Full-scale production

Timeline Considerations

A typical custom front-light development cycle ranges from 8-12 weeks, depending on complexity. This includes 2 weeks for definition, 3 weeks for concept and design, 2 weeks for validation, and 3-5 weeks for initial production. Accelerated development options are available for time-sensitive projects.

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Next: How to custom Touch Screen for E Ink display?

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Next: How to custom Touch Screen for E Ink display?