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Display panel with pressure sensor and electronic device with pressing input function

  • US 9,990,072 B2
  • Filed: 07/30/2015
  • Issued: 06/05/2018
  • Est. Priority Date: 02/01/2013
  • Status: Active Grant
First Claim
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1. A display comprising:

  • a display panel including an image forming panel that controls light emitted to a front face side thereof to form a displayed image, and a polarizing plate disposed at the front face side of the image forming panel;

    a pressure sensor having a piezoelectric film formed of a first at least uniaxially drawn polylactic acid;

    a flexible buffer member between the pressure sensor and the image forming panel, and directly adjacent the front face side of the image forming panel; and

    a phase compensating film adjacent the pressure sensor, the phase compensating film formed of a second at least uniaxially drawn polylactic acid, whereinboth the pressure sensor and the phase compensating film are disposed between the mage forming panel and the polarizing plate,a first uniaxial drawing direction of the piezoelectric film is orthogonal to a second uniaxial drawing direction of the phase compensating film, andan angle between the first uniaxial drawing direction of the piezoelectric film and the second uniaxial drawing direction of the phase compensating film cancels an effect of birefringence on the light wave penetrating the piezoelectric film and the phase compensating film.

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