Introduction of our Technologies

 

Technical Features

Outline of the next-generation color display panel |Technical specifications| Comparison with the conventional products

Outline of the Next-generation Color Display Panel

Present level in industry:  Although the phase modulation devices have been used for the diffraction grating with wave-front control and infrared rays,  the addressing  mode(for example  Galvano mirror system) are still  left  unchanged. The improvements  from mechanical mode to electric one, or frame  frequency faster than the present 50 - 60 Hz ,or from reflective mode to transmittive one, have been desired. However, when thinking about the electrical addressing system and the high speed drive using LCD, slow response characteristics for both rise and decay process of the conventional liquid crystal have been hindering its realization. (Please refer to Figure 1.)

chart 1
Fig. 1 Please click the image to enlarge.

With the conventional display panel (b), intensity of the transmitted light (rectangular wave characteristic) changes largely until 100 Hz, meanwhile with the AFLC panel (a) there is almost no change until 500Hz.

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Technical Specifications

FSC mode is a method to write in the image data of R,G, and B while  R, G, B LED illuminating the image in chronological order for one picture element (pixel) and synchronizing with it.
Compared with the conventional display method, number of pixels can be only 1/3, thus the number of drive ICs being reduced to 1/3.
In addition, the power for illumination is reduced to 1/3 ~1/5 thanks to no backlight loss at the filter.

Double helical structure of the liquid crystal is suppressed by a narrow gap (approximately 1μm) and turns into the state of surface stabilized anti-ferroelectric liquid crystal (SSAFLC)

Technical Specifications
For details, please see the section introducing our "Technologies.

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Comparison with the Conventional Products

In order to overcome these faults, having paid an attention to the molecular dynamics, researches on the new liquid crystal material AFLC and driving waveform were performed. Thus, we succeeded in realizing FSC panel at an effective field of view of 10mm x 15mm, drive line 32 lines x data line 64 lines, and drive frequency 180 Hz with the simple matrix drive method last year.Z

(Please refer to Fig. 1, Fig. 2, and the attached material 1.

Demonstration display in simple matrix drive and FSC mode.
Figure 2: Demonstration display in simple matrix drive and FSC mode.

Based on these experiences and results, we have developed a prototype model of 2-dimensional device enriched with higher added-values; (1) " high-speed response" faster more than ten times (frame frequency of 800Hz or more) compared with the conventional device and (2)"high definition" (target line-and-space 200lines/mm) to secure the diffraction characteristic that is important in the infrared transmissions, etc., at the same time.  

In order to attain these, we have set 3 specific technical targets;

  1. to blend more high-speed anti-ferroelectric liquid crystal mixture with the spontaneous polarization,
  2. to define the etching conditions when to use the ITO material in order to realize the transparent mode and high definition at the same time, and
  3. to develop newly a dynamic drive waveform to realize high-speed response (5 times faster than the conventional one).