41.1: Development of RGBw LCD with Edge Lit 2D Local Dimming System for Automotive Applications

Abstract

We have developed 10-inch RGBW LCD with edge-lit 2D local dimming backlight system for automotive applications. This prototype system has power consumption reduction performance of 41.5% compared to a conventional RGB display without local dimming backlight. The performance and evaluation results are described in this paper. Author KeywordsAutomotive display, RGBW, Local Dimming, LCD, Backlight, Edge-lit, CIE2000 BackgroundThe backlights for automotive displays require high power consumption to obtain high luminance more than 1,000 cd/m2. High-resolution displays, as well as the current mobile displays are expected to be used for automotive in the near future, resulting in increased power consumption. Furthermore, there has been concern about the cost of the heat sink systems to suppress the increase in the temperature of automotive displays. As such, the development of displays with reduced power consumption is becoming increasingly important. Moreover, high-contrast characteristics, especially deep black, are required to achieve unity of interior design. We previously reported the development of an RGBW mobile display with a local dimming system [1] based on the "Extended HSV" color space model [2, 3] to reduce power consumption and obtain a higher contrast ratio. In our previous study [1], LEDs were placed on one side of the LCD module. To obtain over 1,000 cd/m2 luminance for high-resolution automotive displays, LEDs are placed on both sides of the LCD module in this study. Furthermore, a 2D local dimming system can be adapted to suppress increased backlight power consumption, which can achieved by optimizing the previous 1D local dimming algorithm for 2D. Method for Determining LED PWM in 2D

57.5: Optimized Compensation Film for Automotive Display with Wide Viewing Angle

“…Liquid Crystal Display (LCD) devices have been widely used at automotive display, for instance instrument cluster, center information display [1]. Twisted nematic (TN) [2] mode and Super Fine TFT (SFT) [3][4][5] mode are two popular liquid crystal display modes at Automotive Display.…”

27‐3: High Performance Fringe Field Switching Mode Liquid Crystal Display with Photo‐alignment Technology for Vehicular Application

“…Several display devices have been widely used in a vehicle, such as instrument cluster display, center information display, and entertainment display [1]. For these vehicular displays, information sharing and touch suitability are crucially important.…”

14‐1: Patterned Holey Glass LGP Based Ultra‐Thin 2D Local Dimming Backlight

“…Contrast can be enhanced through the use of lenticular lenses on the front surface of the light guide plate (LGP) that confine the light from the LEDs in one dimension. Limited 2D local dimming has been demonstrated with edge-lit backlights but they cannot achieve the performance of thicker direct-lit BLUs [3], [4]. Direct lit BLUs are thicker due to the larger distance required to achieve the desired luminance uniformity.…”