Dual-Color LED Backlight Mixing for Transflective Display Contrast
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Solution Overview
Problem
Conventional transflective displays suffer from limited color range and reduced contrast, particularly in low-light conditions, due to the use of a single-color backlight that washes out images and reduces brightness.
Innovation Solution
A transflective display device with a dual-color LED system, comprising a reflective spatial light modulator and drivers, allows for adjustable intensity and color mixing of light emitted by LEDs, enhancing brightness and color consistency across the display surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-color backlight is used in transflective displays, then the device structure is simple, but the color range is limited and contrast is reduced
Solution Approach 1:
The backlight is segmented into multiple independent LED groups (first group emitting first color, second group emitting second color) that can be controlled separately. This allows different color regions to be independently adjusted, expanding the color range while maintaining a manageable structure through modular organization.
Solution Approach 2:
The patent combines multiple LED types emitting different colors (e.g., white and amber, or red and green) to create a composite backlight system. This composite approach enables a broader color gamut and better color accuracy compared to single-color backlights, while the LEDs themselves are solid-state composite structures.
2Device complexity
If a single-color backlight is used in transflective displays, then the device structure is simple, but the contrast is reduced and images appear washed out
Solution Approach 1:
The backlight is divided into multiple controllable LED groups that can be independently adjusted in intensity. This segmentation allows selective dimming or brightening of specific color regions, enabling better contrast control by adjusting the mix of colors to enhance darks and brights separately, thereby improving image quality without overwhelming structural complexity.
Solution Approach 2:
The backlight system transitions from a static single-color output to a dynamic multi-color system where the intensity of each LED group can be independently adjusted. This dynamic control allows the backlight to adapt to different display requirements, enhancing contrast by selectively modulating the contribution of different color components to the overall image.
3Adaptability or versatility
If a dual-color LED system is used, then color versatility is improved, but the device complexity increases
Solution Approach 1:
The dual-color LED system is segmented into distinct controllable groups (first group for first color, second group for second color) with separate drive circuits. This modular segmentation manages complexity by organizing the system into independent units that can be controlled individually, allowing color versatility while keeping the overall architecture manageable through repeated modular patterns.
Solution Approach 2:
The backlight system is designed with multi-functionality, where the same physical structure supports both single-color and dual-color operating modes. The drive circuits and optical paths are configured to handle multiple color outputs universally, allowing the system to adapt to different color requirements without requiring completely separate hardware for each mode, thus managing complexity through design flexibility.
4Adaptability or versatility
If dual-color LEDs with adjustable intensity are used, then color mixing control is improved, but the control system complexity increases
Solution Approach 1:
The control system is segmented into separate drive circuits for each LED group, with each driver independently controlling the intensity of its associated color. This segmentation simplifies the control architecture by breaking down the complex task of color mixing into independent single-color intensity control tasks, making the system more manageable while still achieving sophisticated color mixing through the combination of independently controlled channels.
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 provides high-quality images with improved contrast and color versatility, adapting to varying lighting conditions through user-adjustable backlight control.
Implementation Method 1
The reflective spatial light modulator may be configured to receive light emitted from the primary light source at the modulating side, and to spatially modulate the received light by selectively reflecting the light at separately addressable positions on the modulating side along the optical path toward the display surface
Implementation Method 2
The reflective spatial light modulator may be configured to at least partially transmit light received at the backside such that light transmitted through the backside is introduced to the optical path and directed toward the display surface
Implementation Method 3
The set of LEDs may be configured to emit light that is directed to the backside of the reflective spatial light modulator
Data Source
AI summary
Some implementations pertain to a transflective display device comprising a display surface, an optical path, and/or other components. The optical path may spatially modulate light emitted from a primary light source and direct it to the display surface, generating a display of visual information. The optical path may include a reflective spatial light modulator and a set of Light Emitting Diodes. The modulator may receive light from the primary light source and selectively reflect it toward the display surface. The Light Emitting Diodes may emit light directed to the backside of the modulator, including white light and light of a first color. Some implementations may include drivers to control the intensity of the light emitted by the Light Emitting Diodes, dictating the tone of the light transmitted through the modulator. This configuration may facilitate the creation of a uniform, high-quality display.