46‐3: Invited Paper: Design and Process of 2D Backlight Beyond HDR 5000 Nits

Abstract

HDR 2D‐backlight designs and some process for each of automotive/monitor, mobile device, and future Reality applications are presented. On‐chip lens and confining wall reflector structure are suitable for automotive/monitor applications, and 5,000nits of peak brightness will be performed in real usage. The white LED chip architecture is proposed for mobile applications of 2‐1mm thin backlight. The power efficiency is evaluated to be almost double, and the 500lux ambient light contrast is 5 times larger than a 15.6‐inch OLED display. The 0.5mm thin film backlight with micro‐LED chips for Reality applications is proposed.

Performance Comparison between Mini-LED Backlit LCD and OLED Display for 15.6-Inch Notebook Computers

“…To compete with OLED displays [10] and other emerging displays, such as micro-LED displays [11][12][13][14][15][16], the mini-LED backlit LCDs (abbreviated as mLCDs) have been rapidly developed in recent years. Through two-dimensional (2D) local dimming [17][18][19][20][21], mLCDs can greatly improve the contrast ratio, bit depth, and power consumption. In contrast, OLED displays offer an unprecedented contrast ratio, faster response time, thin profile, and excellent flexibility, but the tradeoff between brightness and lifetime remains to be overcome [22,23].…”

“…Based on our measured data, the mLCD exhibited a higher peak brightness, a more accurate gamma curve, better brightness uniformity at low gray levels, larger color volume, lower power consumption, and higher ambient contrast ratio. The confining reflector wall [21] in Nichia's mLCD backlight helped to reduce the zone crosstalk and the halo effect. In comparison with previous methods, our color measurement adopted the reference method recently recommended by the International Committee for Display Metrology (ICDM), and the 3D display gamut envelopes were created from 602 measured surface colors.…”

Advanced liquid crystal devices for augmented reality and virtual reality displays: principles and applications

“…4b , for the PM driving method, most of the power is consumed when the large driving current passes through parasitic resistor ( P = I × R 2 ). Recently, to overcome the impact from short emission period, the multiple scanning scheme, which drives multiple rows at one time, is used in the PM driving method to increase the duty ratio 90 . In this work, the total rows are divided into 12 groups and the mini-LEDs of each group are driven at the same time, extending the duty ratio from 2.08% to 8.33% to reduce the required driving currents.…”

87‐5: AM Mini‐LED Based on LTPS TFT Backplane with over 5000 Dimming Zones and High Driving Bits

“…Moreover, Nichia Corp. reported a method with introducing 3D reflective plate structure or bump structure around the LED chip to form a retaining wall to inhibit the diffusion of LED light to adjacent zones, by which the halo effect can be improved and the peak luminance of module reaches 5000nits. 7 Moreover, the improvement of the dimming algorithm is also an effective method used to suppress the halo effect. 8 Although there are many ways to improve the halo effect, each method also has limitations.…”