Method for selecting writing sheet for touch panel pen, touch panel system, writing sheet for touch panel pen, touch panel and display device

摘要

Provided is a method for selecting a writing sheet for a touch panel pen, which can accurately select a writing sheet in which generation of unpleasant sounds during writing is suppressed. A method for selecting a writing sheet for a touch panel pen, wherein a sheet satisfying the following conditions 1-1 and 1-2 is selected as a writing sheet for a touch panel pen. Condition 1-1 Record the sound when writing on the surface of the writing sheet for the touch panel pen using the touch panel pen under predetermined conditions. The sound pressure (dB / Hz) for each 1 Hz is calculated from the recorded sound by fast Fourier transform. The maximum value of dB / Hz at a frequency of 1 Hz to 20,000 Hz is normalized to 100 and the minimum value is normalized to 0, and the normalized dB / Hz is defined as a standard sound pressure P. The frequency 1 Hz to 20,000 Hz is divided into 10 sections every 2,000 Hz, and the integrated value of the standard sound pressure P in each section is calculated. The integrated value of the standard sound pressure P having a frequency of 1 Hz to less than 2,000 Hz, which is the first section, is P ₁ , and the integrated value of the standard sound pressure P having a frequency of 18,000 Hz to 20,000 Hz, which is the tenth section, is P ₁₀ . In this case, P ₁ / P ₁₀ is 1.25 or more. Condition 1-2 When the standard deviation σ of the integrated value of the standard sound pressure P in the 10 sections is calculated, σ is 13,500 or less.