Search

US-12619006-B2 - Wavelength selective absorption filter and display device

US12619006B2US 12619006 B2US12619006 B2US 12619006B2US-12619006-B2

Abstract

A wavelength selective absorption filter contains a resin, a coloring agent, and a compound having at least one polar group of a carboxylic acid ester bond, a carboxylic acid amide bond, a sulfonic acid amide bond, a urethane bond, or a sulfonyl bond and a MW≤1,000 where dye includes at least one of dye A having a main absorption wavelength range at a wavelength of 390 to 440 nm and dye D having a main absorption wavelength range at a wavelength of 680 to 780 nm, a 20% value wavelength A with respect to an absorbance maximal value exhibited by a main absorption wavelength is 455 nm or less where dye A is contained, and a 20% value wavelength D with respect to the absorbance maximal value exhibited by the main absorption wavelength is 640 nm or more where dye D is contained, and a display device.

Inventors

  • Nobutaka Fukagawa
  • Hiroki Kuwahara

Assignees

  • FUJIFILM CORPORATION

Dates

Publication Date
20260505
Application Date
20230516
Priority Date
20201225

Claims (10)

  1. 1 . A wavelength selective absorption filter comprising: a resin; a coloring agent; and a compound that has at least one polar group of a carboxylic acid ester bond, a carboxylic acid amide bond, a sulfonic acid amide bond, a urethane bond, or a sulfonyl bond and has a molecular weight of 1,000 or less, wherein the coloring agent includes at least one of the following dye A or the dye D, in a case of including the dye A, a wavelength of two wavelengths, on a long wavelength side, which provide an absorbance of 20% with respect to an absorbance maximal value at a wavelength of 390 to 440 nm is 455 nm or less, and in a case of including the dye D, a wavelength of two wavelengths, on a short wavelength side, which provide an absorbance of 20% with respect to an absorbance maximal value at a wavelength of 680 to 780 nm is 640 nm or more, the dye A: a coloring agent having a main absorption wavelength range at a wavelength of 390 to 440 nm the dye D: a coloring agent having a main absorption wavelength range at a wavelength of 680 to 780 nm.
  2. 2 . The wavelength selective absorption filter according to claim 1 , wherein the coloring agent includes both the dye A and the dye D.
  3. 3 . The wavelength selective absorption filter according to claim 1 , wherein the dye A is a coloring agent represented by General Formula (A1), in the formula, R 1 and R 2 each independently represent an alkyl group or an aryl group, R 3 to R 6 each independently represent a hydrogen atom or a substituent, and R 5 and R 6 may be bonded to each other to form a 6-membered ring.
  4. 4 . The wavelength selective absorption filter according to claim 1 , wherein the dye D is a squaraine-based coloring agent represented by General Formula (1), in the formula, A and B each independently represent an aryl group which may have a substituent, a heterocyclic group which may have a substituent, or —CH=G, and G represents a heterocyclic group which may have a substituent.
  5. 5 . The wavelength selective absorption filter according to claim 1 , wherein the compound having a polar group is a compound having a carboxylic acid ester bond.
  6. 6 . The wavelength selective absorption filter according to claim 1 , wherein the compound having a polar group is a compound having a carboxylic acid amide bond.
  7. 7 . The wavelength selective absorption filter according to claim 1 , wherein the resin includes a polystyrene resin.
  8. 8 . The wavelength selective absorption filter according to claim 1 , wherein the resin includes a cyclic polyolefin resin.
  9. 9 . A display device comprising the wavelength selective absorption filter according to claim 1 .
  10. 10 . The display device according to claim 9 , wherein the display device is a self-luminous display device.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a Continuation of PCT International Application No. PCT/JP2021/048223 filed on Dec. 24, 2021, which was published under PCT Article 21(2) in Japanese, and which claims priority under 35 U.S.C. § 119 (a) to Japanese Patent Application No. 2020-217496 filed in Japan on Dec. 25, 2020, and Japanese Patent Application No. 2021-131753 filed in Japan on Aug. 12, 2021. The above applications are hereby expressly incorporated by reference, in their entirety, into the present application. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wavelength selective absorption filter and a display device. 2. Description of the Related Art On the other hand, with the increase in the size of displays (display devices) or the spread of tablet personal computers (PCs) and smartphones, the environment in which displays are used has become more diverse, and thus it has become increasingly important to improve the visibility in bright places, for example, directly under sunlight or bright indoor lighting. In general, an antireflection function is provided in the display screen of the display so that an observer can easily see the image. Such a function is realized by an antireflection film or an antiglare film. Examples of the general antireflection film include an anti reflection (AR) film or a low reflection (LR) film, in which a film having a refractive index different from that of a base material is coated on the surface of the base material to reduce reflection by the effect of interference between the light reflected on the surface of the base material and the light reflected on the surface of the coated film. In addition, examples of the general antiglare film include an antiglare (AG) film including an antiglare layer, in which a film having a fine uneven pattern is coated on the surface of a base material to prevent the reflected glare of the image by using the light scattering effect. However, a part of the light incident on the display is transmitted through the antireflection film or the antiglare film on the surface and then is reflected on the surface of the electrode, wire, or the like, or the glass surface of the cell. This is called internal reflection. In association with the increase in resolution of displays, the proportion of the area of the metal parts such as electrodes or wires to the area of the entire panel (the area of the metal parts such as electrodes or wires/the area of the entire panel) increases, and thus the prevention of the above-described internal reflection is a particularly important factor in ensuring high-quality display performance. As a means for preventing the internal reflection, there is known a method of providing a λ/4 phase difference plate or a λ/2 phase difference plate between a polarizer of a polarizing plate and an internal reflection place and causing it to function as a circularly polarizing plate, for example, as described in WO2012/043375A. However, this method has a problem in that the transmittance of the display light is reduced to about 40% and in a case where scattering particles are present between the circularly polarizing plate and the internal reflection place, depolarization occurs and thus a sufficient antireflection effect cannot be obtained. As a result, there is a demand for the development of an antireflection unit that does not use the λ/4 phase difference plate or the λ/2 phase difference plate. For example, JP2015-36734A discloses a liquid crystal display device using a method of preventing the reflection of external light by adding an absorption material having an absorption peak having a half-width of 50 nm or less in a polarizing plate on a viewer side, the absorption material being at least one of a first absorption material having a maximum value of absorbance in a wavelength range of 470 to 510 nm or a second absorption material having a maximum value of absorbance in a wavelength range of 560 to 610 nm. In addition, for the intended purpose of suppressing a decrease in contrast and improving color reproduction in a bright place for an image display device, particularly a self-luminous type image display device such as a plasma display, JP2008-203436A proposes using an optical filter having an absorption maximum in each of a wavelength range of 380 nm to 420 nm, a wavelength range of 480 nm to 520 nm, and a wavelength range of 585 nm to 620 nm. On the other hand, an optical film having a function of cutting out blue light is also known. For example, JP2017-142412A discloses an optical film which contains an absorption material having an absorption maximum in a wavelength range of 380 nm to 420 nm and has selective absorption in a vicinity of 420 nm and in which a ratio of an absorbance at 450 nm to an absorbance at a wavelength of 420 nm is in a specified range. In addition, WO2014/208749A discloses a cured film containing a coloring agent having a speci