LED Display Pad-Cover Molding for Higher Contrast
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Solution Overview
Problem
The contrast ratio of display devices is compromised by electrode pads connected to light emitting diodes (LEDs), as these pads can reflect light and decrease image quality, and existing solutions like opaque molding either block light or require high power to drive the LEDs.
Innovation Solution
A display device design featuring a base substrate with electrode pads, where a first molding covers at least part of the electrode pads to prevent light reflection, and a second molding covers the light emitting devices and first molding, with the first molding being more opaque than the second to minimize exposure and enhance contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an opaque molding is stacked over the entirety of the display to decrease light reflection from electrode pads, then the contrast ratio is improved, but the light emitted from the LED is blocked requiring high power to drive the LED
Solution Approach 1:
The molding is divided into two distinct parts: a first molding with higher opacity that covers only the electrode pad area to reduce light reflection, and a second molding with lower opacity that covers the LED while allowing light transmission. This segmentation enables selective application of opacity properties to different functional zones, solving the contradiction between reducing reflection and maintaining light output.
Solution Approach 2:
Different regions of the display structure are assigned different optical properties: the first molding covering the electrode pad has higher opacity to minimize reflection, while the second molding covering the LED has lower opacity to maximize light transmission. This local differentiation of quality allows each region to perform its specific function optimally without compromising the other.
2Ease of manufacture
If the electrode pad is exposed to the front surface to connect the LED through a wire, then the connection is simplified, but the contrast ratio decreases due to light reflection
Solution Approach 1:
The first molding acts as an intermediary element that covers the electrode pad, preventing direct exposure to light while maintaining the electrical connection functionality. This mediator eliminates the harmful light reflection effect without interfering with the underlying electrical connection between the LED and electrode pad.
3Object-affected harmful factors
If a molding with high opacity is used to cover the electrode pad, then light reflection is reduced, but the overall light transmission to the viewer is decreased
Solution Approach 1:
The molding structure is segmented into two parts with different opacity characteristics: the first molding with higher opacity covers only the electrode pad to reduce reflection, while the second molding with lower opacity covers the LED to preserve light transmission. This segmentation ensures that the harmful reflection is reduced without compromising the useful light output.
Solution Approach 2:
The optical properties of the molding are localized to specific functional areas: high opacity is applied locally to the electrode pad coverage area to minimize reflection, while low opacity is applied locally to the LED coverage area to maximize light transmission, achieving both goals simultaneously.
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
This design improves the contrast ratio of the display device by reducing light reflection from electrode pads while maintaining high luminance and saturation at lower power consumption.
Implementation Method 1
a first molding configured to cover at least a part of the electrode pad by avoiding an area in which the light emitting device is provided
Implementation Method 2
The LED is connected to the electrode pad provided on a base substrate and emits light in response to an applied electrical signal
Data Source
AI summary
A display device includes a base substrate having an electrode pad on a front surface thereof, a light emitting device provided on the base substrate and connected to the electrode pad, a first molding configured to cover at least a part of the electrode pad by avoiding an area in which the light emitting device is provided, and a second molding configured to cover the light emitting device and the first molding.