Hyun-Seok Ko

40.1: Distinguished Contributed Paper: Integrated Amorphous Silicon Color Sensor on LCD Panel for LED Backlight Feedback Control System

In this paper, we present the feasibility of an optical color sensing feedback system for an LED backlight by integrating the amorphous silicon color sensor onto the LCD panel. To improve the well-known photoconductivity degradation of amorphous silicon, a new LASER immersion treatment has been applied. The integrated color sensor optical feedback controlled LED backlighting system improved the color variation to less than 0.008 Δu‘v’ (CIE1976) compared with 0.025 for an open loop system over the temperature range of 42°C to 76°C.

LED backlight driving system with local dimming and scanning driver IC

Abstract— Novel LED backlight driving technology with a fully embedded LED driver IC is presented. This driving system and IC feature a high speed reduced swing differential signaling (RSDS) interface, an independent PWM controller with high-resolution programming, and embedded scan logic. To attain high efficiency from the boost converter, highly advanced dynamic headroom control technology has been implemented onto the IC. The embedded current boosting function showed almost no brightness reduction when operated in scanning mode. The scanning function of the system improved motion blur values 26–44% compared to that of a non-scanning LCD panel.

50.1: Advanced Local Dimming and Scanning LED Backlight Driving System Using Novel Driver IC

This paper presents novel LED backlight driving technology with a fully embedded LED driver LC. This driving system and IC feature a high speed Reduced Swing Differential Signaling (RSDS) interface, an independent PWM controller with high resolution programming, and embedded scan logic. To get high efficiency from the boost converter, highly advanced dynamic headroom control technology has been implemented onto the IC. The embedded current boosting function showed almost no brightness reduction when operated in scanning mode. The scanning function of the system improved motion blur scores about 30% compared with a non-scanning LCD panel.