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Display device, electronic device, and mobile information terminal

Inactive Publication Date: 2018-02-22
SEMICON ENERGY LAB CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a display device that can display images with wide color gamut. Furthermore, it can reduce the contrast made by narrow spectra and create eye-friendly images. The invention also includes a novel light-emitting element that has excellent color purity.

Problems solved by technology

However, although light emitted by a light-emitting element has an excellent chromaticity, the light has extremely narrow spectra, such that the display has strong contrast, and thus is too intense for the viewers and likely to tire them.

Method used

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  • Display device, electronic device, and mobile information terminal
  • Display device, electronic device, and mobile information terminal
  • Display device, electronic device, and mobile information terminal

Examples

Experimental program
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Effect test

embodiment 1

[0049]In this embodiment, a display device of one embodiment of the present invention will be described with reference to FIGS. 1A and 1B.

[0050]FIG. 1A illustrates a structure of a display device of one embodiment of the present invention, which includes a liquid crystal element 100L and a light-emitting element 100E.

[0051]The liquid crystal element 100L includes a liquid crystal layer 103L and alignment films 104 between a first electrode 101L and a second electrode 102L. The first electrode 101L is a reflective electrode which can reflect ambient light. The second electrode 102L is a transparent electrode that has a light-transmitting property and is capable of transmitting visible light.

[0052]A color filter (also referred to as a coloring layer) 105L and a polarizing layer 106 are provided on the side where light transmitted through the second electrode 102L exits to the outside. Accordingly, the light transmitted through the second electrode 102L is transmitted through the color...

embodiment 2

[0078]In this embodiment, an example of a light-emitting element which can be applied to a display device of one embodiment of the present invention will be described.

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[0079]A basic structure of a light-emitting element will be described. FIG. 3A illustrates a light-emitting element in which an EL layer including a light-emitting layer is provided between a pair of electrodes. Specifically, an EL layer 303 is provided between a first electrode 301 and a second electrode 302.

[0080]FIG. 3B illustrates a light-emitting element that has a stacked-layer structure (tandem structure) in which a plurality of EL layers (two EL layers 303a and 303b in FIG. 3B) are provided between a pair of electrodes and a charge generation layer 304 is provided between the EL layers. Such a tandem light-emitting element can be driven at low voltage.

[0081]The charge generation layer 304 has a function of injecting electrons into one of the EL layers (303a or 303b) and injecting holes into the other of the EL...

embodiment 3

[0152]In this embodiment, a display device of one embodiment of the present invention which has a first element layer including a liquid crystal element and a second element layer including a light-emitting element and in which the display elements can perform the respective kinds of display is described. Note that such a display device can also be referred to as an emission and reflection hybrid display or an emission / reflection hybrid display (ER-hybrid display) or the like.

[0153]The display device in this embodiment, which can perform both display using the liquid crystal element and display using the light-emitting element, can be driven with extremely low power consumption in the outdoors and other bright places where ambient light is intense when a reflective liquid crystal element is used as the liquid crystal element because the display can be performed with the reflective liquid crystal element utilizing the ambient light. In the case where the ambient light is too intense ...

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PUM

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Abstract

A display device capable of displaying images with wide color gamut is provided. A display device capable of displaying images with wide color gamut and capable of relaxing contrast made by narrow spectra is provided. The display device includes a liquid crystal element and a light-emitting element. Light obtained from the liquid crystal element through a color filter has an NTSC area ratio of more than or equal to 20 percent and less than or equal to 60 percent and light emitted by the light-emitting element has a BT.2020 area ratio of more than or equal to 80 percent and less than or equal to 100 percent.

Description

TECHNICAL FIELD[0001]One embodiment of the present invention relates to a display device and an electronic device. Note that one embodiment of the present invention is not limited thereto. That is, one embodiment of the present invention relates to an object, a method, a manufacturing method, or a driving method. In addition, one embodiment of the present invention relates to a process, a machine, manufacture, and a composition of matter. As specific examples, a semiconductor device, a display device, a liquid crystal display device, a lighting device, and the like can be given.BACKGROUND ART[0002]As display devices, liquid crystal display devices including a liquid crystal element as their display element, light-emitting devices including a light-emitting element (EL element) as their display element, and the like are known. For example, in a liquid crystal display device, a liquid crystal element including a liquid crystal material is interposed between a pair of electrodes facing...

Claims

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Application Information

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IPC IPC(8): G02F1/1335H04N1/60G02F1/1343G02F1/137
CPCG02F1/133553H04N1/6058G02F1/13718G02F1/1343H04N1/6066G02F1/133621G02F1/133514G02F2201/44H10K59/50H10K59/38H10K59/12H10K50/13
Inventor YAMAZAKI, SHUNPEISEO, SATOSHIHATSUMI, RYO
Owner SEMICON ENERGY LAB CO LTD
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