---
title: "Light Guide Plate"
industry: "Computer, Electronic and Optical Product Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:LIGHT_GUIDE_PLATE"
  data_integrity_hash: "566ced42ccb093e88ca3fd2359ee2936"
  source_authority: "https://cnfx.com"
  strict_mode: true
source_identity:
  provider: "CNFX Industrial Knowledge Graph"
  index_version: "2026.Q1-Universal"
  authority_id: "URN:CNFX:ME:LIGHT_GUIDE_PLATE"
  data_source_uri: "https://cnfx.com/llms/industry/computer-electronic-and-optical-product-manufacturing/product/light-guide-plate.md"
  official_resource_url: "https://cnfx.com/industry/computer-electronic-and-optical-product-manufacturing/product/light-guide-plate"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0.5-2.0 lux/mm² (illuminance gradient across surface)"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 42
    unit: "°"
    consequence: "Fresnel reflection loss exceeding 8% at air-PMMA interface due to surface contamination or micro-scratches (Snell's Law violation)"
fmea_matrix_quantitative:
  - node_1:
      trigger: "LED junction temperature &gt; 125°C (thermal runaway)"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Thermal interface material with 5 W/m·K conductivity between LED array and heat sink"
  - node_2:
      trigger: "Moisture ingress &gt; 1000 ppm (relative humidity 85% at 85°C)"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Hermetic sealing with 0.5 mm butyl rubber gasket and desiccant packet"
bom_nodes:
  light-input-edge:
    type: "component"
    urn: "URN:CNFX:ME:LIGHT_INPUT_EDGE"
    interface_type: "physical-logic-coupled"
  microstructure-pattern:
    type: "component"
    urn: "URN:CNFX:ME:MICROSTRUCTURE_PATTERN"
    interface_type: "physical-logic-coupled"
  reflective-sheet-interface:
    type: "component"
    urn: "URN:CNFX:ME:REFLECTIVE_SHEET_INTERFACE"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 9001:2015 - QUALITY MANAGEMENT SYSTEMS"
    scope: "Verified Engineering Specification"
  - standard: "CE MARKING - DIRECTIVE 2014/35/EU (LOW VOLTAGE DIRECTIVE)"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/computer-electronic-and-optical-product-manufacturing/product/light-guide-plate.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "7d5d9090eae5760bab00cfe84ceaca521f0b1e2713f065277401465ac94e0bb4"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Light Guide Plate

## 1. Technical Definition
A transparent optical component that guides and distributes light from edge-mounted LEDs uniformly across the display surface.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0.5-2.0 lux/mm² (illuminance gradient across surface)**. Failure boundary: **Total internal reflection angle &gt; 42° (critical angle for PMMA/acrylic)**, Mechanism: **Fresnel reflection loss exceeding 8% at air-PMMA interface due to surface contamination or micro-scratches (Snell's Law violation)**.

### 2.1 Analytical Physics Model
Governed by the **Rayleigh Resolution Criterion**:

> **Primary Equation**: $d = \frac{0.61 \lambda}{NA}$  
> **Engineering Impact**: Defines the theoretical limit of machine vision systems.

| Symbol | Variable Definition | Localized Reference |
| :--- | :--- | :--- |
| \lambda | Wavelength | Engineering Constant |
| NA | Numerical Aperture | Engineering Constant |

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| LED junction temperature &gt; 125°C (thermal runaway) | 8 | Yellowing of PMMA substrate (photodegradation) | Thermal interface material with 5 W/m·K conductivity between LED array and heat sink |
| Moisture ingress &gt; 1000 ppm (relative humidity 85% at 85°C) | 8 | Light scattering centers formation (Mie scattering) | Hermetic sealing with 0.5 mm butyl rubber gasket and desiccant packet |

## 3. Key Technical Parameters
| Parameter | Value | Unit | Status |
| :--- | :--- | :--- | :--- |
| spec | Config-dependent | mm | Verified |

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **Injection Molding Machine**, **Industrial Chiller**, **Hopper Dryer**  
**Downstream Applications**: LCD Displays, LED Backlit Monitors, Automotive Instrument Clusters  

## 5. Engineering Risks & FAQ
- **Caution**: 
- **Caution**: 
- **Caution**: 

### Q: What are the main advantages of PMMA vs polycarbonate light guide plates?
**A**: PMMA offers superior optical clarity and light transmission (92% vs 88-90% for PC), while polycarbonate provides better impact resistance and thermal stability for demanding applications.

### Q: How does the microstructure pattern affect light distribution?
**A**: The precisely engineered microstructure pattern on the plate's surface scatters and redirects light from edge-mounted LEDs, creating uniform illumination across the entire display area without hotspots or dark spots.

### Q: What industries use light guide plates beyond computer displays?
**A**: Light guide plates are essential in automotive dashboards, medical imaging equipment, industrial control panels, signage, and consumer electronics where uniform backlighting is required for LCDs and other display technologies.

## 6. Manufacturing Compliance
- ISO 9001:2015 - QUALITY MANAGEMENT SYSTEMS
- CE MARKING - DIRECTIVE 2014/35/EU (LOW VOLTAGE DIRECTIVE)

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Light Guide Plate](https://cnfx.com/industry/computer-electronic-and-optical-product-manufacturing/product/light-guide-plate)**

### 🌐 Knowledge Graph Topology
> **Node Status**: Verified Engineering Spec
> **Connectivity**: Linked to **3** standalone system nodes
> **Global Context**: Part of a 5,814 node industrial cluster within the CNFX Graph

> **Reference ID**: LIGHT_GUIDE_PLATE | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: cae0763b
