BACKLIGHT AND LIQUID CRYSTAL DISPLAY DEVICE

• Main Authors: NAKANISHI TAKASHI, TATSUMI MASAKI, OTA MASAYUKI, MIYATA MASATAKA, OSADA SEISHI, TAMAOKI KAZUO, KURITA KENICHI
• Format: Patent
• Language: English; Japanese
• Published: 15.06.2017
• Subjects: BASIC ELECTRIC ELEMENTS; 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; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; SEMICONDUCTOR DEVICES; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF

PROBLEM TO BE SOLVED: To provide a backlight in which white balance adjustment at a high level that induces decrease in display luminance of a liquid crystal panel is not required.SOLUTION: A backlight 42 includes: LED bars 43, 44 in which a plurality of light-emitting devices 5 (LED) that comprises a combination of an LED element emitting primary light and a phosphor excited by the primary light to emit secondary light at a longer wavelength than that of the primary light and emits synthesized light of the primary light and the secondary light are linearly spaced and arrayed; and a light guide plate 6 which accepts the light emitted from the LED bars 43, 44 through at least one end of the light guide plate and radiates the light in a surface emission state to a liquid crystal panel 4. Chromaticity values of the light emitted from the LED bars 43, 44 through the light guide plate 6 and transmitted through the liquid crystal panel 4 are coincident in the entire liquid crystal panel. A wavelength peak difference of LEDs between the LED bars 43, 44 is 10 nm or less.SELECTED DRAWING: Figure 14 【課題】液晶パネル上の表示輝度の低下につながるような大きなホワイトバランス調整の必要が生じないバックライトを提供する。【解決手段】バックライト４２は、１次光を発するＬＥＤ素子と１次光により励起して１次光よりも長波長の２次光を発する蛍光体とを組み合わせて１次光と２次光との合成光を発する複数の発光装置５（ＬＥＤ）が直線状に間隔をおいて配列されたＬＥＤバー４３，４４と、少なくとも一端側から入射するＬＥＤバー４３，４４からの出射光を液晶パネル４に面状に放射する導光板６とを備える。各ＬＥＤバー４３，４４からの出射光が導光板６を経て液晶パネル４を透過した透過光の色度が液晶パネルの全体で一致する。また、ＬＥＤバー４３，４４の間のＬＥＤの波長ピーク差は１０ｎｍ以下である。【選択図】図１４