Display device

A display device and display panel technology, which is applied to identification devices, optics, instruments, etc., can solve the problems of phosphor scattering, large reflection, and display quality degradation, and achieve excellent tolerance, increase display brightness, and suppress display quality degradation Effect

Active Publication Date: 2011-01-12
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in the organic EL display panel, the scattering and reflection caused by the phosphor are large, and when used in a bright environment, the display quality deteriorates due to the same reason as above.
In addition, in the plasma display panel, the reflection of the phosphor will also cause the degradation of the display quality.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1、 comparative example 1、2、3、4

[0066] Trial production has and figure 1 The liquid crystal display device 100A shown is a liquid crystal display device of the same structure. As the plastic layer 12, a sheet with a thickness of 0.5 mm of COP (cycloolefin polymer) produced by injection molding was used. The COP sheet has a slow axis in the resin flow direction and a retardation of 28 nm. Here, the COP sheet is used as the protective layer.

[0067] A stretched film of COP is used as the quarter-wavelength layer. The retardation of this COP stretched film at a wavelength of 550 nm was 138 nm.

[0068] The slow axis (or advance axis) of the plastic layer 12 is arranged parallel to the transmission axis of the polarizing layer 16, and the slow axis of the quarter-wave layer 14 is arranged at an angle of 45° to the transmission axis of the polarizing layer 16.

[0069] In addition, on the surface of the polarizing layer 16, the antireflection layer 18 having a structure (moth-eye structure) in which the refractive ...

Embodiment 2

[0086] Trial production has and image 3 The liquid crystal display device 100B shown is a liquid crystal display device of the same structure. As in Example 1, a vertical alignment type liquid crystal display panel was used, and the transmission axis of the polarizing layer 26a of the liquid crystal display panel 20B and the transmission axis of the polarizing layer 16 of the optical plate 10 were arranged orthogonally.

[0087] As shown in Table 2, it can be seen that the reflectance and the results of visual evaluation are as good as the liquid crystal display device of Example 1, and the transmittance is improved compared to the liquid crystal display device of Example 1. In addition, the transmittance is a relative value obtained by setting the transmittance (brightness) of the liquid crystal display device of Example 1 to 1. Among the components common to the liquid crystal display device of Example 1, the same or the same batch of materials was used, unnecessary components...

Embodiment 3

[0091] Trial production has and Figure 4 The liquid crystal display device 200 shown is a liquid crystal display device of the same structure. As the liquid crystal cell 54, a parallel alignment type liquid crystal cell using a nematic liquid crystal material with positive dielectric anisotropy was used. The parallel alignment type liquid crystal cell is produced by rubbing the alignment film in anti-parallel. The retardation of the liquid crystal cell 54 when no voltage is applied is 137 nm, and the retardation can be reduced to 10 nm by applying a sufficient voltage.

[0092] The evaluation results of the liquid crystal cell 54 when a voltage is applied to the liquid crystal layer 53 and when no voltage is applied are shown in Table 3. The evaluation of the visibility was performed in addition to the evaluation at 40,000 lux (bright environment), and also under the virtual dark condition of 100 lux (dark environment).

[0093] [table 3]

[0094]

[0095] From the results of Tab...

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Abstract

A display device (100A) is provided with a display panel (20A); an optical plate (10) arranged on the observer side of the display panel (20A) with an air layer (32) between the display panel and the optical plate; and a reflection preventing layer (18) which is arranged on the observer side of the optical plate (10) and provided with a moth-eye structure on the surface. The optical plate (10) is provided with a plastic layer (12) which transmits visible light; a 1 / 4 wavelength layer (14) arranged on the observer side of the plastic layer (12); and a polarization layer (16) which is arranged on the observer side of the 1 / 4 wavelength layer (14) and transmits linearly polarized light. The display device is more applicable to mobile purposes compared with the conventional display devices.

Description

Technical field [0001] The present invention relates to a display device, in particular to a display device suitable for mobile use. Background technique [0002] The display quality of the display device may be degraded due to external light. In particular, small and medium-sized display devices used in mobile electronic devices (for example, mobile phones, PDAs), etc., are often used in bright environments. For example, even if it is cloudy, there is a brightness of about 40,000 lux, and the outdoor brightness with sufficient sunlight in midsummer can reach about 100,000 lux. [0003] When viewing the display device in such a bright environment, external light (reflected light) reflected on the surface or inside of the display device is superimposed on the display light emitted from the display device, and therefore the display quality is degraded. The external light has components in the entire wavelength range of visible light (λ=380 nm to 780 nm). Therefore, for example, whe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09F9/00G02B1/11G02B5/30G02F1/1335G02F1/1347
CPCG02F1/1335G02B1/118G02F1/1347
Inventor 二宫郁雄山田信明津田和彦坂井彰
Owner SHARP KK
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