JP-2022535206-A5 -

Dates

Publication Date

20230529

Application Date

20200522

Description

Table 1 summarizes the measurement results of the infrared reduction layer, lagging axis direction, and polarization state for Embodiment 1, Comparative Example 1, and Comparative Example 2. In Embodiment 1 and Comparative Example 1 of Table 1, "stretched film" indicates that the infrared reduction portion includes an infrared reduction layer made from a stretched polymer film. In Comparative Example 2 of Table 1, "stretched film/unstretched film" indicates that the infrared reduction portion of Comparative Example 2 includes an infrared reduction layer formed by superimposing a prepared body of the infrared reduction portion of Comparative Example 2 on the infrared reduction portion of Embodiment 1 on top of the infrared reduction portion of Embodiment 1. In Table 1, "formed angle (average)" indicates the average angle formed by the lagging axis of the infrared reduction portion and the vibration direction of the linear polarization of visible light. In Table 1, "perpendicular incidence" indicates the measurement results of the polarization state using the measurement system in Figure 8A, and "oblique incidence" indicates the measurement results of the polarization state using the measurement system in Figure 8B. The following are exemplary embodiments. [Item 1] A display unit that emits linearly polarized visible light containing display information, An infrared reduction unit that transmits the visible light from the display unit and reduces the amount of infrared light incident on the display unit, The infrared reduction section comprises a reflecting section that reflects the visible light that has passed through the infrared reduction section, The infrared reduction unit includes an infrared reduction layer, The infrared reduction layer has a slow axis, The aforementioned retard axis is generally parallel to the vibration direction of the linear polarization. A display device characterized by the following features. [Item 2] The term "approximately parallel" means that the angle formed by the retard axis and the vibration direction of the linear polarization is greater than 0 degrees and less than 10 degrees. The display device described in item 1. [Item 3] The angle of incidence of the linear polarization to the infrared reduction unit is greater than 0 degrees and less than 90 degrees. The display device described in item 1. [Item 4] The infrared reduction unit further includes an ultraviolet reduction layer that reduces the transmittance of ultraviolet rays, Both the infrared reduction layer and the ultraviolet reduction layer are transparent in the visible light region. The display device described in item 1. [Item 5] The aforementioned transmittance has a transmittance of more than 60% in the visible light region. The display device described in item 4. [Item 6] The infrared reduction section includes a hard coating. The display device described in item 4. [Item 7] The aforementioned UV-reducing layer is an adhesive layer. The display device described in item 4. [Item 8] The display device further comprises a window portion, the window portion is mounted on an opening provided in the instrument panel of the vehicle, and is disposed between the display portion and the reflector portion in the optical path of the visible light. The infrared reduction unit is provided between the window and the reflecting unit. A display device as described in any one of items 1 to 7. [Item 9] The display device further comprises a window portion, the window portion is mounted on an opening provided in the instrument panel of the vehicle, and is disposed between the display portion and the reflector portion in the optical path of the visible light. The infrared reduction unit is provided between the display unit and the window unit. A display device as described in any one of items 1 to 7.