51.2: New Front Surface Film for Improving the Viewing‐Angle Properties of TN‐Mode TFT‐LCDs

Abstract

We have succeeded in the development of a new front surface film, it has the function of improving the viewing-angle properties (especially, improvement of gray scale inversion in downside direction) of TN-mode TFT-LCDs, in addition to the conventional function of the protection of polarizer and the glare prevention under bright room surrounding 1) .The excellent viewing-angle properties have been realized in combing this new front surface film with the optical compensation film for TN-mode (Wide-View Film, for short WV Film). According to the proposal of this method, it has been expected to apply TN-mode to large-size LCD monitors and LCD TVs hereafter.

Optical design and roll‐to‐roll fabrication process of microstructure film for wide viewing LCDs

“…In this section, we present the optimization of our microstructure film for two LC modes, TN‐LCD and MVA‐LCD. As described in the previous section, our approach for the improvement of viewing angle characteristics of LCD is similar to the third approach in the concept of diffusing the incident lights from LCD on the surface of LCD . One of the large differences between the two approaches is the level of the collimation of backlight.…”

“…As described in the previous section, our approach for the improvement of viewing angle characteristics of LCD is similar to the third approach in the concept of diffusing the incident lights from LCD on the surface of LCD. [8][9][10] One of the large differences between the two approaches is the level of the collimation of backlight. We proposed a new method without adopting collimated backlight because the efficiency of the collimated backlight is generally low, and its cost is high as compared with the commonly used diffusing backlight.…”

“…The second approach was to insert optical compensation films between glasses and polarizers, which still had a grayscale inversion with asymmetric viewing angle characteristics especially at high polar angles . The third approach was to attach a diffusing film to the surface of LCD, which caused a blur in the frontal image and degraded a contrast ratio under the bright ambient light owing to its backscattering . Therefore, we have developed a new microstructure film to solve these issues by just attaching it to the surface of TN‐LCD …”

“…6,7 The third approach was to attach a diffusing film to the surface of LCD, which caused a blur in the frontal image and degraded a contrast ratio under the bright ambient light owing to its backscattering. [8][9][10] Therefore, we have developed a new microstructure film to solve these issues by just attaching it to the surface of TN-LCD. [11][12][13][14][15] In addition, the improvement effect of viewing angle characteristics of the microstructure film is not limited to the TN-LCD.…”

4.1: Distinguished Paper: Cavity Shape Control of the Roll‐to‐Roll Fabricated Novel Microstructure Film for Improving the Viewing‐Angle Characteristics of LCDs

“…The second approach was to insert optical compensation films between LC cell and polarizers, which still had the grayscale inversion with asymmetric viewing-angle characteristics especially at large oblique angle [6,7]. The third approach was to attach a scattering film to the surface of the LCD, which caused the blur in the front image and degraded a contrast ratio under the bright ambient light owing to its backscatter [8][9][10].…”