We have demonstrated a multicolor electrochromic device (ECD) with a novel architecture. Different typical ECDs featuring commonly two flat transparent electrodes, a double electrical layer electrode is applied to the device as the counter electrode. By this architecture, even two EC molecules with different polarities mixed in the same ECD can display their unique color, respectively. This paper reports the effect of several commonly-used quaternary ammonium salts as electrolytes on color properties of the ECD featuring a hybrid capacitor architecture. The aim is to select the suitable electrolyte to fabricate multicolor ECD with excellent color performance. Among them, the electrolyte tetraethylammonium tetrafluoroborate performs most satisfactorily attributed to its small ion size and high conductivity. This novel, easily-fabricated, and high EC performance multicolor device provides an opportunity that will develop color ECDs and expand the potential of EC technology.
It is expected that the shapes of real-world objects such as buildings and people can be sensed, stored as point clouds, and utilized. For efficiently storing and transmitting a huge amount of point cloud data, point cloud compression methods based on deep learning have been studied. In order to grasp an overview or details of a desired building or person on a display, it is an important function to extract whole or a desired part of the point cloud from the compressed data and represent the characteristic shape of the object. In this paper, a hybrid point cloud encoding method is proposed, which consists of a layered structuring that presents the main features of the point cloud with various number of points and an efficient block-wise encoding by combining deep learning.
It is known, that daylight reflection on an LCD significantly degrades the visual quality and readability of a display. Methods to mitigate this problem like daylight image enhancement are mainly based on the assumption that the reflection is linearly dependent of the daylight intensity. It was found out by extensive measurements that the reflection also depends on the gray-value of a pixel and thus image contents . The reflection at a white image may exceed two-times of that at a dark image. In this paper, the reflection is modelled as a function of the transmission value of a (sub)pixel and is decomposed into three parts, namely a constant part for the surface reflection, a linear term for the LC-cell and a square term for the reflection of the BLU. This refined and, regarding the daylight direction, generalized model leads to an excellent agreement with measurements.
To realize a flexible exciter that can be united with a flexible display without compromising their excellent features such as weight reduction, improved storability, and improved impact resistance, a novel bendable electro-acoustic transducer (B.E.A.T.) has been developed employing the viscoelastic polymer as the matrix of 0-3 type piezoelectric composites. By using a pair of flexible exciters attached to the back of a flexible display, the display can make sounds by itself without speaker equipment, which provides the ideal fusion of video and sound like a movie theater.
A proximity capacitance image sensor and measurement system for high-sensitivity and high-resolution display inspection adopted a new step-type bonding pad structure with the thin protective film on the pixels have been developed. This sensor and system have good detectability of line and point defects in the active area on a 264 ppi thin film transistor substrate and defects of fine pitch wires in peripheral fan-out areas and complex gate driver on array areas. This technology enabled the contactless detection of fine defects in pixel and peripheral areas on display substrate, and thus, further quality and yield improvement of flat panel displays are expected.
In this paper, we implement an algorithm that automatically switches the total modulation orders in a field pick-up unit (FPU) for mobile live program productions and evaluate its performance through laboratory and field experiments. We are conducting R&D on high-capacity FPUs for mobile live 4K/8K program productions, such as live broadcasting for road racing. Using adaptive transmission control, we aim for stable transmission in poor propagation environments and high-speed transmission in good ones. The switching algorithm is expected to expand the variable range of throughput. We implemented the algorithm in a prototype and evaluated the algorithm's operation through laboratory and field experiments. As a result, it was confirmed that the variable range of throughput, 2.79 times with the conventional method, was expanded to 3.40 times, and the stable transmission area was expanded.