Cholesteric liquid crystal writing tablet with spacer controlled sensitivity

A cholesteric liquid crystal writing tablet comprising:

• a first transparent substrate that is flexible on which a writing pressure is applied and a second substrate spaced apart from said first substrate;
• electrically conductive layers one of which is in contact with said first substrate and is transparent and another of which is in contact with said second substrate, said electrically conductive layers being separated from each other by a cell gap;
• cholesteric liquid crystal material disposed between said electrically conductive layers;
• and
• spacers disposed in said liquid crystal material that control said cell gap;
• wherein said spacers have a size and concentration in said liquid crystal material that restrict flow of said liquid crystal material when said cell gap is reduced upon application of said writing pressure, thereby forming writing on said writing tablet;
• wherein said spacers satisfy the formula:
• 0.2≦(Ad−As)/Ad<1, where Ad is an entire writing area of said writing tablet on which the writing can be made and As is the total are occupied by all of said spacers as projected on said first substrate or said second substrate within said writing area.