백라이트 유닛 및 액정 표시 장치

• Main Authors: MATSUNO YUKI, NAMIKAWA YOSHITADA
• Format: Patent
• Language: Korean
• Published: 19.08.2020
• Subjects: BLASTING; DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; FREQUENCY-CHANGING; FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMSTHEREOF; HEATING; LIGHTING; MECHANICAL ENGINEERING; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHERARTICLES, NOT OTHERWISE PROVIDED FOR; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; WEAPONS

백라이트 유닛(5)은, 도광 시트(21)와, 도광 시트(21)의 표면에 배치된 광확산 시트(23)를 구비한다. JIS K 7125에 준거하여, 온도 23℃, 습도 50%의 조건 하에서 측정된 도광 시트(21)와 광확산 시트(23) 사이의 정마찰계수를 Y, JIS K 7197에 준거하여 측정된, 도광 시트(21)의 선팽창계수와 광확산 시트(23)의 선팽창계수의 차를 X로 한 경우에, 하기 식 (1)의 관계가 성립한다. [수 1] Y≤1.00Х10X-3.43Х10X+2.35 (1) A backlight unit (5) includes a light guide sheet (21) and a light diffusion sheet (23) provided on the surface of the light guide sheet (21). Assuming that the coefficient of static friction between the light guide sheet (21) and the light diffusion sheet (23) measured at a temperature of 23° C. and a humidity of 50% in accordance with JIS K 7125 is Y1, and the difference in coefficient of linear expansion between the light guide sheet (21) and the light diffusion sheet (23) measured in accordance with JIS K 7197 is X, the following relational expression (1) is satisfied.[Math. 1]Y1≤1.00×10−4X2−3.43×10−2X+2.35  (1).