Guo-Zhen Wang

Bare Finger 3D Air-Touch System Using an Embedded Optical Sensor Array for Mobile Displays

Generally, 3-D interactive systems are used in systems with large displays and are not suitable for portable devices. To “touch” a floating 3-D image displayed from a mobile device, we proposed a camera-free, 3D, interactive, virtual-touch system for bare fingers. By embedding optical sensors into the display pixels and adding angular scanning illuminators to the edge of the display, a flat panel can sense the images reflected off a bare finger. The three-axis (x, y, z) information of the fingertip can be determined by analyzing these reflected images. The proposed 3-D virtual-touch system successfully functions with a 4-in mobile display.

Three-Dimensional Virtual Touch Display System for Multi-User Applications

By embedding optical sensors onto a TFT substrate in a display, a flat panel can sense images projected by infrared (IR) light. Light pens which can project Multi- T-mark including out-mark and in-mark of IR images were utilized to calculate the 3-axis information ( x, y, and z) of the tip of the light-pen and achieve accurate user identification accordingly. Therefore, a 3-dimensional virtual touch display for 3-axis information with multi-user/multi-touch system can be achieved.

Camera free 3-dimensional virtual touch display with multi-user identification

A camera free 3D interactive system for multi-user/multi-touch was proposed. By embedding the optical sensors in display pixels, the flat panel can sense images projected by infrared(IR) light. A light pen which can project T-mark IR image was utilized to determine the 5-axis (x, y, z, θ, φ) information of the user. Additionally, multiple T-marks with sequentially illuminating method can further identify multi-users even the marks are overlapped. Therefore, a 3-dimensional virtual touch display for 5-axis information with multi-user system can be achieved.

Delta-Color Adjustment (DCA) for Spatial Modulated Color Backlight Algorithm on High Dynamic Range LCD TVs

A high-dynamic-range liquid crystal display (HDR-LCD) which studies as a dual-panel display can much enhance the contrast ratio of image and reduce the power consumption upon the locally controlled dynamic backlight. A simple modulated algorithm, Delta-Color Adjustment (DCA) method, was proposed to determine the RGB-LEDs backlight modulation for high image quality. By implementing the DCA method on a 37¿ HDR-LCD TV with 8 × 8 backlight zones, the contrast ratio of a high contrast image can reach ~ 40000:1 with clear image detail and 40% power reduction. Furthermore, by controlling the R, G, and B LEDs individually , the color gamut can be enlarged to 125% NTSC.

51.2: Delta‐Color Adjustment (DCA) Method for Color Controlled Backlight of High Dynamic Range LCD‐TVs

A high-dynamic-range liquid crystal display (HDR-LCD) can much enhance the contrast ratio of image and reduce power consumption upon the locally controlled dynamic backlight. Delta-color adjustment(DCA) method with simple adjustment progress, was proposed and demonstrated on a 37″ HDR-LCD to further reduce the power consumption, increase the contrast widen the NTSC ratio and can still maintain image details.

Liquid crystal lens array for 3D display and 3D air-touch

A low driving voltage with fast response LC-lens by using high resistance material was developed. By implementing the LC-lens as an array structure, it can be adaptively used for multi-function of 3D displays. Furthermore, by combining with coded optical barrier with embedded optical sensors, it can yield 3D air-touch function.