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International Display Workshop 2019 (IDW’19)
Cockpit Display Technologies Focus on Driver’s Safety

T

he 26th International Display Workshop 2019 (IDW ᾿19) was held at Sapporo Convention Center in Sapporo, Japan from Nov. 27 to 30 (Photo 1). Highlighting the event this year are two keynote addresses, two plenary addresses, 131 invited presentations, 144 oral presentations, and 210 poster presentations. A total of 489 papers were presented in eight parallel sessions. Presenters came from 15 countries and regions. Specifically, papers from Japan accounted for 45 percent; Korea accounted for 19 percent; China accounted for 17 percent, and Taiwan, 10 percent, and the rest are from Australia, Belgium, Canada, Finland, France, Germany, Hong Kong, Switzerland, the Netherlands, Britain, and the United States (Fig. 1). The number of attendees this year was lower compared to the last event held in Nagoya, in Japan’s Aichi Prefecture.

This article delves into the keynote address “Human-Centered Automotive Cockpit HMI” by Taro Oike, General Manager of Mazda Motor Corp. It also discusses the outline of Keynote Exhibition, which is a new feature at IDW. From the Invited Presentations, the author presents some highlights of Sharp Corp.’s automotive active matrix organic light-emitting diode (AMOLED) display and Japan Display Inc. (JDI)’s 8K low temperature poly-silicon thin-film transistor LCD (LTPS TFT-LCD), which employs a laser backlight. Concurrently held exhibition drew 16 manufacturers and five university laboratories. This paper also presents the exhibit of Oxide Corp.

Breakdown of papers (Photo by the author)
Fig. 1: Breakdown of papers (Photo by the author)
Sapporo Convention Center (Photo by the author)
Photo 1: Sapporo Convention Center (Photo by the author)
Keynote Address and Exhibition
An automotive display installed in the cockpit is a human-machine interface (HMI) device. It displays useful information for the driver, but at the same time, could distract the driver’s attention. Safety in driving is the most important element of automobiles, and to ensure safety, design requirements of HMI devices must be met. As automotive displays emit and reflect light, optical control technology is critical for automotive displays. In the exhibition area, design concepts of Mazda Motor’s passenger car and cockpit (Photo 2), and a module from an automotive display module manufacturer were exhibited.
Visitors form a line to experience the test ride at Mazda’s concept car at the Keynote Exhibition
Photo 2: Visitors form a line to experience the test ride at Mazda’s concept car at the Keynote Exhibition (Photo by the author).
Presentations

High-mobility top-gate IGZO-TFT by Sharp
Photo 3 shows the demonstration ma-chine for a 12.3-inch diagonal automotive center information display (CID). The de-vice consists of a flexible AMOLED and a touch sensor. As backplane, a high-mobility indium gallium zinc oxide-thin-film tran-sistor (IGZO-TFT) with a top-gate structure is adopted. The display has a resolution of 1920×720×RGB (167ppi), and it has an excellent brightness uniformity. This device shows high reliability even in harsh condi-tions, such as temperatures as high as 85°C and as low as -40°C, and at a humidity of 90 percent at 60°C, and exhibiting continu-ous operation in good conditions even after 1,000 hours.

JDI’s 17-inch laser backlight LCD
JDI showcased a 17-inch diagonal 8K LTPS TFT-LCD that satisfies BT.2020 specifications (Photo 4). It has a resolution of 510ppi, and its color gamut covers 98 percent of BT.2020. In order to satisfy these specifications, JDI has developed a laser backlight unit and new color filters. At this moment, in or-der to satisfy BT.2020 speci-fications, a laser backlight is necessary. The display has a liquid crystal response time of 5msec, which is sufficient for the 120Hz driving.

Exhibition of Oxide Corporation
In laser displays, speckle noise causes the deterioration of image quality. Speckle is a random laser light interference phe-nomenon, which is generated in the human eyes. Therefore, the accurate measurement of speckle noise is the first step for the de-velopment of speckle reduction technology.

Sharp’s automotive flexible AMOLED (Photo by the author)
Photo 3: Sharp’s automotive flexible AMOLED (Photo by the author)
Photo 4: JDI’s 17-inch 8K LTPS TFT-LCD
Photo 4: JDI’s 17-inch 8K LTPS TFT-LCD (Photo by the author)
Exhibit by Oxide Corporation (Photo by the author)
Photo 5: Exhibit by Oxide Corporation (Photo by the author)
Dr. SPECKLE, a speckle evaluation tool for laser display development from Oxide Corporation (Photo 5) is the only measurement system fully compliant with the international standard IEC 62906-5-2 (measuring method). Its characteristics are as follows: 1) the CCD camera optical system accurately reproduces image in-tensity distribution of the human eye; 2) It measures speckle contrast as a quantitative measurement index of speckle noise; 3) It is portable and is convenient for carrying.

Conclusions
This year’s sessions featured displays and augmented reality/virtual reality de-vices that employ micro LEDs and quan-tum dots. Characteristics of displays have conventionally been discussed mostly on numerical values obtained in a dark room using a luminance meter.

At IDW’19, more discussions on dis-play characteristics using ambient contrast ratio, in which the reflection of display sur-face is taken into consideration, and mov-ing picture response time was observed.

About This Article:
The author, Yasuhiro Ukai, Ph.D., is from Ukai Display Device Institute (UDDI).