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Electroluminescent display device
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An electroluminescence display and electroluminescence technology, applied in electroluminescence light sources, electric light sources, identification devices, etc., can solve problems such as contrast deterioration, and achieve the effect of improving utilization efficiency
Active Publication Date: 2020-10-30
FUJIFILM CORP
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[0003]
Image display devices reflect external light, especially in bright environments, which deteriorates contrast
Method used
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Embodiment 1
[0507] As the EL substrate 1, an LED display (manufactured by Silicon Core Technology, LLC., LAVENDER, pitch of light-emitting elements: 1.2 mm) was prepared. The area ratio of the light emitting elements on the EL substrate 1 was 25%.
[0508] On the EL substrate, a circular polarizing plate having a polarizing plate 101 was arranged so that the positive C plate side became the EL substrate 1 side, and a surface film (manufactured by Fujifilm Corporation, CV-LC5), thus producing the (EL) display device 11 of Example 1.
[0509] When arranging, the region A (low polarization region) of the manufactured circular polarizing plate is aligned so that it corresponds to the light-emitting element of the EL substrate 1 . In addition, the distance between the patterned polarizing layer and the upper surface of the light emitting element was set to 1 mm.
Embodiment 2～6 and Embodiment 11 and comparative example 1 and comparative example 2
[0511] Display devices 12 to 18 of Examples 2 to 6, Example 11, and Comparative Example 1 were produced in the same manner as in Example 1 except that circular polarizing plates having polarizing plates 102 to 108 were used.
[0512] In addition, as Comparative Example 2, in Example 1, when the circular polarizing plate was arranged on the EL substrate, the position of the region A of the circular polarizing plate did not correspond to the position of the light emitting element of the EL substrate 1, and the display device 27 was fabricated. .
Embodiment 7
[0514] Three-color light-emitting LEDs (manufactured by ROHM Co., Ltd., PICOLED, model: SMLP34RGB) were arranged in a two-dimensional grid on the printed circuit board so that the area ratio of LEDs (light-emitting elements) became 10%. A black layer made of a black matrix material for a liquid crystal display device was formed by photolithography on a portion where LEDs were not arranged. Thus, the EL substrate 2 (refer to Figure 4 ).
[0515]In the same manner as in Example 1, a circular polarizing plate having a patterned polarizing layer 109 and a surface film were disposed on the EL substrate 2 to fabricate a display device 19 of Example 7.
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Abstract
The present invention addresses the problem of providing a display device which is capable of achieving a good balance between anti-reflection effects for outside light and improvement of the utilization efficiency of light emitted by an electroluminescent element. The present invention solves this problem by a display device which sequentially comprises, in the following order, a substrate that has a plurality of electroluminescent light emitting elements, a [lambda] / 4 wavelength plate, and a polarizing plate that comprises a patterned polarization layer, and which is configured such that: the patterned polarization layer has regions A that have a degree of polarization of less than 80% and regions B that have a degree of polarization of 80% or more; and the positions of the regions A ofthe patterned polarization layer correspond to the positions of the light emitting elements of the substrate.
Description
technical field [0001] The present invention relates to a display device using luminescence based on electroluminescence. Background technique [0002] In recent years, development of display devices using self-luminous light-emitting elements such as organic electroluminescence (organic EL (Electro Luminescence) and inorganic EL (inorganic LED (Light Emitting Diode: Light Emitting Diode)) as display devices instead of liquid crystal display devices In progress. [0003] The image display device reflects external light especially in a bright environment, which deteriorates the contrast. [0004] Therefore, a self-luminous display device using a light-emitting element, such as an organic EL display device and an inorganic EL display device, has a circular polarizing plate composed of a polarizer and a λ / 4 plate as an antireflection film on the surface. [0005] For example, Patent Document 1 discloses an organic EL display device comprising an organic EL element portion com...
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Application Information
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