Liquid Crystal Display Device Black Floating Suppression
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Solution Overview
Problem
Liquid crystal display devices in FFS and IPS modes suffer from black floating issues during manufacturing, leading to luminance unevenness and reduced display quality, especially in non-rectangular or curved shapes, where stress-induced black luminance increases cannot be sufficiently reduced by conventional drive voltage adjustments.
Innovation Solution
A liquid crystal display device with a normally black system, where the orientation axis of the liquid crystal is shifted from the absorption axis direction of one polarization plate when no voltage is applied, allowing for different voltages to be applied in local and remaining areas to achieve predetermined local minimum transmissivity values, minimizing black luminance and luminance distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If stress is applied to the liquid crystal panel during manufacturing, then black floating occurs and black luminance increases, but conventional drive voltage adjustments cannot sufficiently reduce the luminance unevenness
Solution Approach 1:
The patent applies different drive voltages to different regions of the liquid crystal panel. Specifically, a first drive voltage is applied to a first region and a second drive voltage is applied to a second region, allowing each region to be optimized independently for luminance uniformity and black floating suppression
Solution Approach 2:
The patent changes the drive voltage parameter to suppress black floating and improve luminance uniformity. By adjusting the voltage applied to the liquid crystal in different regions, the patent achieves better control over the liquid crystal orientation and transmissivity characteristics
2Adaptability or versatility
If the liquid crystal panel has a non-rectangular shape or curved shape, then stress easily occurs, but this leads to deterioration in in-plane distribution of luminance
Solution Approach 1:
The patent divides the liquid crystal panel into different regions (first region and second region) and applies different drive voltages to each region. This allows the patent to compensate for stress-induced luminance unevenness in specific areas, particularly in non-rectangular or curved shaped panels where stress distribution is non-uniform
Solution Approach 2:
The patent dynamically adjusts the drive voltage based on the specific region of the panel and the observed luminance characteristics. By making the drive voltage region-dependent, the patent adapts to the varying stress conditions in different parts of the panel
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 approach effectively minimizes black luminance and suppresses in-plane luminance distribution, enhancing the display quality of liquid crystal display devices by optimizing transmissivity characteristics and correcting luminance unevenness.
Implementation Method 1
a liquid crystal layer 24 with a liquid crystal 24a, an electrode 6, 8 applying voltage to the liquid crystal 24a, wherein an orientation axis direction of the liquid crystal 24a in a case where the voltage is not applied is a direction of a homogeneous orientation
Implementation Method 2
Absorption axis directions of a pair of polarization plates attached to outer sides of the array substrate and the counter substrate are perpendicular to each other, and an orientation axis direction of the liquid crystal (for example, the long axis direction of the liquid crystal) is arranged to be parallel to the absorption axis direction of one of the polarization plates
Implementation Method 3
In the TN mode, when the liquid crystal is oriented in the vertical direction by the electric field, the liquid crystal has a certain angle with the substrate, thus there are problems that brightness varies depending on a direction of seeing the liquid crystal panel
Implementation Method 4
In the lateral electric field liquid crystal display device, a long axis of the liquid crystal is substantially parallel to the substrate surface, and the liquid crystal does not straighten in the direction vertical to the substrate, thus a fluctuation of the brightness at a time of changing a visual direction of seeing the liquid crystal panel is small
Data Source
AI summary
An object is to provide a technique capable of increasing a display quality of a liquid crystal display device. A liquid crystal display device includes a liquid crystal panel including a liquid crystal layer with a liquid crystal, an electrode applying voltage to the liquid crystal, and a pair of polarization plates sandwiching the liquid crystal layer. A first voltage is applied to a liquid crystal in a local area in the liquid crystal panel when a transmissivity of the local area is set to a predetermined local minimum value, and a second voltage is applied to a liquid crystal in a remaining area other than the local area in the liquid crystal panel when the transmissivity of the remaining area is set to a predetermined local minimum value. The first voltage is different from the second voltage.