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CN-116893530-B - Electronic equipment

CN116893530BCN 116893530 BCN116893530 BCN 116893530BCN-116893530-B

Abstract

An electronic device is provided which has a transmissive display panel and a reflective display panel and improves the display quality of the reflective display panel. The electronic device (300) includes a first display panel (100) having a first display surface, and a second display panel (200) having a second display surface, wherein light emitted from the first display surface is incident on the second display surface, the first display panel is configured such that light emitted from the first display surface and incident on the second display surface contains a large amount of P-polarized light components, the second display panel is a reflective display panel, and the second display surface has a polarizing plate configured to absorb the S-polarized light components of the incident light.

Inventors

  • USUKURA NARU
  • ITOU AKIKO
  • MURATA KOJI
  • YOSHIDA KEISUKE

Assignees

  • 夏普显示科技株式会社

Dates

Publication Date
20260508
Application Date
20230328
Priority Date
20220329

Claims (15)

  1. 1. An electronic device, comprising: a first display panel having a first display surface; A second display panel having a second display surface and configured to allow light emitted from the first display surface to enter the second display surface, The first display panel is configured such that light emitted from the first display surface and incident on the second display surface contains a large amount of P-polarized light component, The second display panel is a reflective display panel having a polarizing plate on the second display surface, the polarizing plate being configured to absorb an S-polarized light component of incident light, The first display panel is a transmissive display panel, and has: The liquid crystal display device includes a first display surface, a liquid crystal element layer, a first polarizing plate having an absorption axis parallel to a horizontal direction of the first display surface, a second polarizing plate having an absorption axis in a direction of absorbing a polarized light component in a vertical direction of the first display surface, and a backlight source, the first polarizing plate and the second polarizing plate being disposed so as to face each other with the liquid crystal element layer interposed therebetween, and configured to display in a normally black mode, The second polarizing plate has an absorption axis inclined downward in a vertical direction of the first display surface from a normal direction of the first display surface.
  2. 2. The electronic device according to claim 1, wherein the first polarizing plate is disposed on the first display surface side of the liquid crystal element layer.
  3. 3. The electronic device according to claim 2, further comprising a third polarizing plate disposed on a side of the second polarizing plate opposite to the liquid crystal element layer, the third polarizing plate having an absorption axis or a reflection axis parallel to a vertical direction of the first display surface.
  4. 4. The electronic device according to claim 1, wherein the second polarizing plate is disposed on the first display surface side of the liquid crystal element layer.
  5. 5. The electronic apparatus according to claim 4, wherein the liquid crystal element layer is a liquid crystal element layer of a transverse electric field mode, and liquid crystal molecules in the liquid crystal layer of the liquid crystal element layer have positive dielectric anisotropy, and are pre-tilted so as to have a slow axis tilted downward from a normal direction of the first display surface to a vertical direction of the first display surface.
  6. 6. The electronic device according to claim 5, further comprising a phase difference plate disposed between the liquid crystal element layer and the first polarizing plate or the second polarizing plate disposed on the first display surface side, wherein the phase difference plate has a slow axis inclined upward from a normal direction of the first display surface to a vertical direction of the first display surface.
  7. 7. The electronic device according to claim 5 or 6, wherein the liquid crystal element layer is configured to be capable of further applying a longitudinal electric field to the liquid crystal layer.
  8. 8. The electronic device according to any one of claims 4 to 6, wherein the liquid crystal element layer is configured to be capable of applying a horizontal-direction transverse electric field parallel to the first display surface.
  9. 9. The electronic device according to any one of claims 4 to 6, wherein an inclination angle of the absorption axis of the second polarizing plate with respect to the normal direction is smaller below the first display surface than above.
  10. 10. The electronic device according to any one of claims 4 to 6, wherein the liquid crystal element layer has a plurality of pixels each having a region having a color filter layer and a transparent region, and the liquid crystal layer in the transparent region is always in a black display state.
  11. 11. The electronic device according to any one of claims 4 to 6, further comprising a third polarizing plate disposed on a side of the first polarizing plate opposite to the liquid crystal element layer, the third polarizing plate having an absorption axis or a reflection axis parallel to a horizontal direction of the first display surface.
  12. 12. The electronic device according to claim 2 or 3, wherein the liquid crystal element layer is a liquid crystal element layer of a transverse electric field mode, liquid crystal molecules in the liquid crystal layer of the liquid crystal element layer have positive dielectric anisotropy, are configured to apply a transverse electric field parallel to a vertical direction of the first display surface, and are configured to be capable of further applying a longitudinal electric field to the liquid crystal layer.
  13. 13. The electronic device of claim 12, wherein the electronic device comprises a memory device, The liquid crystal element layer has a plurality of pixels, The vertical electric field is generated by an electrode of each of the plurality of pixels, which is offset from an upper side in a vertical direction of the first display surface.
  14. 14. The electronic device according to claim 2 or 3, wherein the liquid crystal element layer is a liquid crystal element layer of a transverse electric field mode, liquid crystal molecules in the liquid crystal layer of the liquid crystal element layer have negative dielectric anisotropy, the liquid crystal element layer is configured to apply a transverse electric field parallel to a horizontal direction of the first display surface, and is configured to be capable of further applying a longitudinal electric field to the liquid crystal layer, and display is performed in a HAN mode.
  15. 15. The electronic device of any one of claims 1-6, further comprising a processor and a storage device.

Description

Electronic equipment Technical Field The present invention relates to an electronic device having two display panels. The electronic device is, for example, a foldable display device, a notebook computer. Background Conventionally, an electronic device having two display panels is known. For example, patent document 1 discloses a liquid crystal display system including a reflective liquid crystal display panel, a transmissive liquid crystal display panel, and a computer. The liquid crystal display system is, for example, a notebook computer, a reflective liquid crystal display panel is disposed on the front surface as a main display, and a transmissive liquid crystal display panel is disposed on the side of the hand for pen input or the like. Patent document 2 discloses a configuration in which a transmissive liquid crystal display panel is disposed on the front side, a reflective liquid crystal display panel is disposed on the hand side as an input interface, and a light source for a backlight of the transmissive liquid crystal display panel is also used as a front light source of the reflective liquid crystal panel. Prior art literature Patent literature Patent document 1 Japanese patent laid-open No. 7-294892 Patent document 2 Japanese patent laid-open No. 2006-53678 Disclosure of Invention The invention aims to solve the technical problems The electronic devices described in patent documents 1 and 2 achieve low power consumption by using a reflective liquid crystal display panel, and in the configuration of patent document 2, a configuration is disclosed in which a light source for illumination of the liquid crystal display panel is efficiently used, but there is room for improvement in display quality of the reflective liquid crystal display panel. The invention aims to improve the display quality of a reflective display panel in an electronic device having the display panel as a main display and the reflective display panel. Technical scheme for solving technical problems According to an embodiment of the present invention, a solution described in the following items is provided. The electronic device according to item 1 includes a first display panel having a first display surface, a second display panel having a second display surface, and configured such that light emitted from the first display surface is incident on the second display surface, the first display panel is configured such that light emitted from the first display surface and incident on the second display surface contains a large amount of P-polarized light component, the second display panel is a reflective display panel, and the second display surface has a polarizing plate configured to absorb the S-polarized light component of the incident light. Item 2 the electronic device of item 1, wherein the first display panel includes an organic EL element layer and a circularly polarizing plate disposed on the first display surface side of the organic EL element layer. The electronic device according to item 3 is the transmissive display panel according to item 1, wherein the first display panel includes a liquid crystal element layer, a first polarizing plate having an absorption axis parallel to a horizontal direction of the first display surface, a second polarizing plate having an absorption axis in a direction of absorbing a polarized light component in a vertical direction of the first display surface, and a backlight, and the first polarizing plate and the second polarizing plate are arranged to face each other with the liquid crystal element layer interposed therebetween, and are configured to display in a normally black mode. Item 4 the electronic device of item 3, wherein the second polarizing plate has an absorption axis inclined downward in a vertical direction of the first display surface from a normal direction of the first display surface. Item 5 the electronic device of item 4, wherein the first polarizing plate is disposed on the first display surface side of the liquid crystal element layer. The electronic device according to item 6 further includes a third polarizing plate disposed on a side of the second polarizing plate opposite to the liquid crystal element layer, the third polarizing plate having an absorption axis or a reflection axis parallel to a vertical direction of the first display surface. The electronic device according to item 7, wherein the second polarizing plate is disposed on the first display surface side of the liquid crystal element layer. Item 8 the electronic device of item 7, wherein the liquid crystal element layer is a lateral electric field mode liquid crystal element layer, and liquid crystal molecules in the liquid crystal layer of the liquid crystal element layer have positive dielectric anisotropy and are pretilt so as to have a slow axis inclined downward from a normal direction of the first display surface to a vertical direction of the first display surface. The electronic device acco