Display Panel Light Reflection for Uniform Pixel Luminance
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Solution Overview
Problem
Existing display devices with light sources on opposite sides of a display panel suffer from non-uniform luminance due to light consumption by internal elements, leading to reduced luminance at intermediate areas when gradation values are equal.
Innovation Solution
A display device with a reflective member on one side to reflect light back towards the light source side, combined with a drive circuit that calculates output gradation values based on summed light quantities and input gradation values to adjust pixel luminance uniformly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light is emitted from one side surface of the display panel, then the light quantity decreases as it propagates through the panel due to consumption by internal elements, but adding a reflective plate to reflect light back increases the light quantity in the panel
Solution Approach 1:
The drive circuit dynamically adjusts the voltage applied to each pixel based on its position and the calculated light quantity, changing the operating parameters of the liquid crystal layer to compensate for light consumption and achieve uniform luminance across the display panel
Solution Approach 2:
The system calculates the light quantity at each pixel position and uses this feedback information to adjust the output gradation values, creating a closed-loop control system that compensates for light loss and ensures uniform brightness
2Illumination intensity
If a reflective plate is added to reflect light back, then the light quantity increases in the display panel, but the device complexity increases
Solution Approach 1:
Instead of using a complex reflective plate structure, the patent uses a simple reflective member and compensates for light loss through parameter changes in the drive circuit, adjusting voltages based on calculated light quantities to achieve uniform luminance
Solution Approach 2:
The patent replaces the mechanical/optical solution of a reflective plate with an electrical control system that calculates and adjusts voltages based on position, substituting physical light reflection with electrical signal processing to achieve the same luminance uniformity
3Length of moving object
If the light source is positioned at the center of the display panel, then the light propagation distance is minimized, but the luminance becomes non-uniform at intermediate areas due to light consumption
Solution Approach 1:
The drive circuit applies different output gradation values to different pixel regions based on their position and calculated light quantity, giving each region the appropriate voltage to achieve uniform luminance across the entire display panel
Solution Approach 2:
The system dynamically changes the voltage parameter for each pixel based on its position and the calculated light quantity, creating position-dependent parameter adjustments that compensate for light consumption and achieve uniform brightness
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
Achieves uniform luminance across the display panel by compensating for light loss, ensuring consistent brightness regardless of position.
Implementation Method 1
a reflective member that is located on the second side surface and configured to reflect the first light as second light from the second side surface side toward the first side surface side
Data Source
AI summary
A display device includes: a display panel having a display area overlapping pixels; a light source device located on a lateral side of the display panel and configured to emit first light to a first side surface side of the display panel to cause the first light to travel toward a second side surface side; a reflective member located on the second side surface and configured to reflect the first light as second light from the second side surface side toward the first side surface side; and a drive circuit configured to calculate an output gradation value for each pixel based on a light quantity obtained by summing a first light quantity of the first light and a second light quantity of the second light at the pixel and an input gradation value of an image signal and apply a voltage corresponding to the output gradation value to the pixel.