JP-2022534026-A5 -

Dates

Publication Date

20230509

Application Date

20200515

Description

In this specification, ranges are expressed as "approximately" from one specific value to and/or "approximately" another specific value. Where such ranges are expressed, another embodiment includes that one specific value to and/or another specific value. Similarly, where a value is expressed as an approximation, the use of "approximately" before it will be understood that the specific value forms another embodiment. Furthermore, it should be understood that the endpoint of each range is significant whether it is related to or independent of the other endpoints. When used herein, directional terms such as up, down, right, left, front, back, up, and down are merely used in reference to the depicted diagrams and do not imply an absolute orientation. Unless otherwise explicitly stated, it is not intended to be construed that any method described herein requires its steps to be carried out in a particular order, or that any apparatus be used or that a particular orientation be required. Accordingly, if the order in which the steps should be followed is not actually described in the claim of a method, or if the order or orientation for individual components is not actually described in the claim of any apparatus, or if it is not specifically stated in the claims or description that the steps should be limited to a particular order, or if a particular order or orientation for components of an apparatus is not described, it is not intended in any way that any order or orientation should be inferred. As used herein, the singular forms “one,” “a,” and “the” (“a,” “an,” and “the”) encompass multiple references unless otherwise explicitly indicated. Accordingly, for example, a reference to “one” component includes embodiments having two or more such components unless otherwise explicitly indicated. It will be apparent to those skilled in the art that various modifications and variations can be made to the embodiments of this disclosure without departing from the spirit and scope of the disclosure. Accordingly, this disclosure is intended to encompass such modifications and variations, provided that they are within the scope of the appended claims and their equivalents. Another aspect of the present invention may be as follows: [1] A light guide plate comprising a glass substrate having two main surfaces defining the thickness and an end surface configured to receive light from a light source, wherein the glass substrate is configured to distribute light from the light source, and the glass substrate contains amounts of Fe, Cr, and Ni metals such that the glass substrate exhibits a color shift Δy measured as negative. [2] The light guide plate according to [1], wherein the glass substrate contains a larger amount of Fe³⁺ than Fe²⁺ . [3] The light guide plate according to [1], wherein the light transmittance T 450nm at 450nm and the light transmittance T 550nm at 550nm satisfy the following equation: T 450nm - T 550nm ≥ -0.3. [4] The light guide plate according to [1], wherein the light transmittance T 450nm at 450nm and the light transmittance T 550nm at 550nm satisfy the following equation: T 450nm - T 550nm ≥ -0.2. [5] The light guide plate according to [3], wherein the glass substrate includes aluminosilicate glass, borosilicate glass, or soda-lime glass. [6] The glass substrate is expressed in terms of mol% oxide: 50-90 mol% SiO₂ , 0-20 mol % Al₂O₃ , 0-20 mol% of B₂O₃ , and It contains 0 to 25 mol% of R x O, In the formula, x is 2 and R is selected from Li, Na, K, Rb, Cs, and combinations thereof, or x is 1 and R is selected from Zn, Mg, Ca, Sr, Ba, and combinations thereof, and the glass substrate further contains at least 0.5 mol% of one oxide selected from Li₂O , Na₂O , K₂O , CaO, and MgO. The light guide plate described in [3] above. [7] The glass substrate is expressed in terms of mol% oxide: 65-85 mol% SiO₂ ; 0-13 mol % Al₂O₃ ; 0-12 mol % B₂O₃ ; 0-2 mol% Li₂O ; 0-14 mol% Na₂O ; 0-12 mol% K₂O ; 0-4 mol% ZnO; 0-12 mol% MgO; 0-5 mol% CaO; 0-7 mol% SrO; 0-5 mol% BaO; and 0.01 to 1 mol% SnO2 The light guide plate described in [3] above, including the above. [8] Light source and, Reflector and The light guide plate described in [1] above, Display products, including those mentioned above. [9] Light source and Reflector and The light guide plate described in [3] above, Display products, including those mentioned above. [10] The display product according to [9], wherein the light source comprises a light-emitting diode optically coupled to the end face of the glass substrate. [11] A method for processing a glass substrate for use as a light guide plate, A step of selecting raw materials for a glass batch, and processing the said raw materials to provide a glass composition, A step of forming a glass substrate having two main surfaces and an end surface defining the thickness from the glass composition, wherein the glass composition contains Fe, Cr, and Ni metals in amounts such that the glass substrate exhibits a neg