Liquid Crystal Display with Segmented Transmittance and Reflective Pixels
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Solution Overview
Problem
Existing liquid crystal display devices face challenges in maintaining display quality across varying light conditions, as they either struggle with brightness in bright environments due to increased power consumption or lack visibility in dark environments due to insufficient ambient light, without suitable means to independently control transmission and reflection regions of pixels.
Innovation Solution
A liquid crystal display device with a controller that independently manages transmittance and reflective pixels, using light sensors to adjust their states based on external light intensity, allowing for optimal brightness and energy efficiency by switching between active and inactive states to utilize either backlight or external light effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the intensity of the backlight is increased to improve display quality in bright environments, then the display brightness is improved, but the power consumption of the light source increases
Solution Approach 1:
The display panel is divided into multiple pixel regions, each independently controllable as either transmittance pixels or reflective pixels. This segmentation allows different regions to serve different functions based on lighting conditions, resolving the contradiction between brightness and power consumption by enabling reflective pixels to utilize ambient light rather than requiring high backlight intensity.
Solution Approach 2:
The display device dynamically switches between transmittance and reflective pixel modes based on ambient light intensity detected by a light sensor. In bright environments, reflective pixels are activated to reduce backlight power consumption, while in dark environments, transmittance pixels are used to ensure adequate display brightness, thus adapting the system to changing conditions.
2Illumination intensity
If a reflection type liquid crystal display device is used to improve visibility in bright environments, then the display can utilize ambient light, but the visibility becomes very low in dark environments due to lack of ambient light to reflect
Solution Approach 1:
The display panel incorporates both transmittance pixels and reflective pixels, allowing the same display device to function in multiple lighting conditions. Transmittance pixels provide adequate visibility in dark environments by transmitting backlight, while reflective pixels enhance brightness in bright environments by reflecting ambient light, thus achieving universal adaptability across different lighting scenarios.
Solution Approach 2:
The display device changes its optical parameters dynamically by switching between transmittance and reflective pixel modes based on ambient light intensity. This parameter change allows the display to optimize its performance for the current lighting condition, maintaining high visibility whether the environment is bright or dark.
3Adaptability or versatility
If known liquid crystal display devices utilize both transmission and reflection of light, then the display can use both backlight and external light, but there is no means for controlling transmission regions and reflection regions independently to regulate for varying external light intensity
Solution Approach 1:
The display panel is segmented into independently controllable transmittance pixel regions and reflective pixel regions. Each region can be selectively activated or deactivated based on ambient light intensity, providing fine-grained control over the display's optical characteristics and enabling optimal performance across varying lighting conditions.
Solution Approach 2:
A light sensor detects ambient light intensity and provides feedback to the controller, which then adjusts the states of transmittance and reflective pixels accordingly. This feedback mechanism enables automatic regulation of the display regions based on real-time lighting conditions, simplifying the control process.
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 consistent display quality across different lighting conditions by dynamically adjusting pixel states, reducing power consumption and ensuring visibility in both bright and dark environments, thereby improving overall display performance and energy efficiency.
Implementation Method 1
control each of the plurality of transmittance pixels in the active state to transmit the backlight from the light source
Implementation Method 2
control each of the plurality of reflective pixels in the active state to reflect external light
Data Source
AI summary
A liquid crystal display device including a liquid crystal display panel, a light source for providing backlight, and a controller for receiving an external input image signal is disclosed. The liquid crystal display panel includes transmittance pixels and reflective pixels therein. The controller independently controls and regulates the transmittance pixels and the reflective pixels to be either in an active state or in an inactive state based on an intensity of external light, such that the transmittance pixels transmit the backlight based on the external input image signal in the active state and block the backlight irrespective of the external input image signal in the inactive state; and the reflective pixels reflect external light based on the external input image signal in the active state and inhibit reflection of the external light irrespective of the external input image signal in the inactive state.