50-2: Development of New Head-Up Display System Utilizing RGBW LCD and Local Dimming Backlight

Abstract

We have developed a prototype of a head‐up display system using transmissive LCD with direct‐lit backlight type 2D local dimming and RGBW technology. We confirmed that the postcard effect, which is a phenomenon where the entire projection area including the noninformation area is slightly illuminated, was virtually eliminated. We also achieved higher white luminance and lower backlightpower.

47‐4: Invited Paper: Development of Fast Response, Low Latency Real‐time Camera and Display System for Automotive Applications

“…In the night driving, inside of the car shall be very dark environment to watch the outside, then the luminance of dark image is required to keep low luminance. We got a real black image in the system by using the local dimming technology [4].…”

“…In the day light condition, higher brightness on the display is needed for keeping good visibility. The RGBW technology was already applied to our CMS [4]. It takes "Bright mode" on its algorism and it can increase panel brightness two times higher.…”

P‐223L: Late‐News Poster: New Head‐Up Display System with Ultrahigh Transmittance Using LCs with Negative Dielectric Anisotropy and RGBW Design

“…In recent decades, HUD systems have attracted much attention and been widely used in high-end automotive vehicles. The most critical issue of head-up displays is readability in sunlight which directly related to luminance and contrast ratio (CR) [1][2]. The conventional systems usually apply LCs with positive dielectric anisotropy together with a highlight backlight (BL) to achieve high luminance.…”

Designing Freeform Micro Lens Array With Prescribed Luminous Intensity for LCD Backlight Units

“…However, for some special LCD applications including antipeeping screens and head up displays, it is crucial for the LCDs to be visible only within a certain angular space and to evenly distribute the luminous intensity of the screen across this range of viewing angles. Taking the LCD in head up display as an example, if the luminous intensity of the BLU is Gaussian, stray light will be inevitably generated in the optical system, and the contrast of the picture observed by the human will be reduced, thus leading to visual fatigue of the driver and endangering driving safety [8], [9]. For these special applications, the precise luminous intensity control of the direct-lit LED BLU is extremely important.…”