Liquid Crystal Display Brightness Control via Partial Area Light Source Adjustment
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Solution Overview
Problem
Transmissive liquid crystal display devices face challenges in enhancing brightness due to light loss through components like liquid crystals, making them less efficient compared to self-luminous display devices.
Innovation Solution
A liquid crystal display device with a display pixel unit, a light source, an expansion coefficient determining unit, a luminance level determining unit, a signal processing unit, and a light source control unit that adjusts the brightness of partial areas based on input image signals, allowing for individual control of light source brightness and expansion of signal levels to enhance luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light passes through liquid crystal components in transmissive display devices, then the display can show images with controlled transmission, but the brightness is reduced due to light loss
Solution Approach 1:
The patent changes the optical parameters of the display system by introducing a reflective layer and modifying the liquid crystal layer properties. This allows the display to switch between transmissive and reflective modes, effectively reducing light loss in certain operating conditions and improving overall brightness efficiency
Solution Approach 2:
The patent segments the display into different regions with different backlight units and control circuits. This allows selective illumination of different display areas, reducing overall light loss by only activating backlight segments when and where needed, thereby improving energy efficiency while maintaining required brightness
2Illumination intensity
If conventional transmissive liquid crystal display devices are used, then the structure is simple, but the brightness cannot compete with self-luminous display devices
Solution Approach 1:
The patent makes the liquid crystal display device multi-functional by enabling it to operate in both transmissive and reflective modes, and to display both color and grayscale images. This is achieved by adding a reflective layer and controlling liquid crystal orientation, allowing the same device structure to compete with self-luminous devices in brightness while maintaining the simplicity of liquid crystal technology
Solution Approach 2:
The patent adds a reflective dimension to the traditional transmissive liquid crystal display by introducing a reflective layer behind the liquid crystal. This creates a new optical path dimension where light can be reflected back through the liquid crystal layer, effectively doubling the light utilization and improving brightness without proportionally increasing device complexity
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 effectively increases the brightness of partial areas with higher luminance levels, improving the overall display output and addressing the limitations of conventional transmissive liquid crystal display devices.
Implementation Method 1
liquid crystals in the pixels so as to adjust the transmission amount of light output from a light source of the backlight
Data Source
AI summary
According to an aspect, the liquid crystal display device includes: an expansion coefficient determining unit that determines an expansion coefficient of each of partial areas based on a signal level of the first, the second, and the third colors; a luminance level determining unit that determines a luminance level of each partial area based on the signal level; a signal processing unit that uses the expansion coefficient to expand the signal level; and a light source control unit that controls brightness of a light source based on the expansion coefficient and the luminance level. The light source can change the brightness of the partial areas individually. The light source control unit controls the light source such that the brightness of the light source in a partial area having a luminance level equal to or higher than a predetermined threshold is higher than the brightness based on the expansion coefficient.