Edge-Lit Backlight Module With Variable Transmittance Control Layer
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Solution Overview
Problem
Conventional display technologies struggle to achieve high dynamic range image rendering due to the thickness constraints of direct-lit backlight modules, which require over 25 mm for uniform light emission, making it impossible to create ultrathin displays capable of high dynamic range rendering.
Innovation Solution
An edge-lit backlight module with a light guide plate and a light transmittance control layer featuring a material with variable light transmissivity, where light emission intensity is individually controllable in each segment through a driving circuit and electrode layers, allowing for real-time luminance adjustment and high dynamic range display in a thinner form factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If direct-lit backlight modules are used to achieve uniform light emission, then light uniformity is improved, but module thickness increases to over 25 mm
Solution Approach 1:
The backlight module is divided into multiple independently controllable segments along the light guide plate, allowing local light intensity adjustment. This segmentation enables high dynamic range rendering without requiring the entire backlight to be thick, as only specific regions need precise light control.
Solution Approach 2:
Different regions of the backlight module are assigned different light transmittance characteristics through the light transmittance control layer. This allows local optimization of light emission properties in different segments while maintaining overall thinness, resolving the contradiction between uniformity and thickness.
2Ease of manufacture
If conventional backlight modules are used, then manufacturing simplicity is maintained, but high dynamic range rendering capability is lost
Solution Approach 1:
The light transmittance control layer serves multiple functions: it controls local light intensity for high dynamic range rendering, maintains light uniformity across segments, and enables individual segment control. This multi-functionality adds capability without requiring completely separate systems, preserving manufacturing simplicity.
Solution Approach 2:
The light transmittance control layer acts as an intermediary between the light guide plate and the display panel, enabling high dynamic range rendering by modulating light intensity locally without requiring fundamental changes to the existing backlight structure or manufacturing processes.
3Adaptability or versatility
If light transmittance control layer is added to enable individual segment control, then high dynamic range rendering is achieved, but device complexity increases
Solution Approach 1:
The light transmittance control layer is integrated with the light guide plate structure, merging the light control function into the existing backlight framework. This combination reduces overall device complexity compared to adding separate control systems, as it unifies light guidance and modulation in a single integrated layer.
4Length of stationary object
If module thickness is reduced to under 10 mm, then ultrathin form factor is achieved, but light uniformity and control capability are compromised
Solution Approach 1:
The patent transitions from vertical light emission (direct-lit) to lateral light emission (edge-lit), changing the dimensional approach to light distribution. This allows ultrathin construction by emitting light from the edges of the light guide plate rather than from within the thickness, maintaining light uniformity while achieving thickness under 10 mm.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables a high dynamic range display effect in an ultrathin form, with a module thickness of no greater than 10 mm, by individually controlling light emission intensity in each segment, overcoming the thickness limitations of conventional backlight modules.
Implementation Method 1
a light transmittance control layer on the light guide plate configured to receive light from the light guide plate and modulate light intensity of the light from the light guide plate, the light transmittance control layer comprising a light transmittance control material having a variable light transmissivity
Implementation Method 2
the light transmittance control layer comprises liquid crystal molecules, light transmittance in the plurality of regions of light transmittance control layer being individually controllable by changing an orientation of the liquid crystal molecules in each of the plurality of regions
Implementation Method 3
the light transmittance control material comprises a material having a light transmissivity that is electronically controllable by applying an electric potential to the light transmittance control material
Data Source
AI summary
The present application discloses a backlight module for a display apparatus. The backlight module for a display apparatus includes a light guide plate; and a light transmittance control layer on the light guide plate configured to receive light from the light guide plate and modulate light intensity of the light from the light guide plate. The light transmittance control layer includes a light transmittance control material having a variable light transmissivity. Light transmittance in a plurality of regions of the light transmittance control layer is individually controllable.