Non-absorbing polarization color filter and liquid crystal display incorporating the same
A technology of polarizer and color filter, applied in the field of color filter, can solve the problem of high power consumption of backlight source
Inactive Publication Date: 2008-08-20
NITTO DENKO CORP
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Therefore, forming high-brightness color images using prior art LCD panels requires a high-intensity backlight that consumes extremely high power, generates a large amount of heat, and requires the use of fans and other cooling measures to keep the LCD Lamp temperatures in panel and backlighting structures are maintained within safe operating limits
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[0025] Having generally described this invention, further understanding can be obtained by reference to certain preferred embodiments which are provided herein for purposes of illustration only and are not intended to limit the scope of the appended claims.
[0026] exist figure 1 In , the subcomponent structure of the broadband multilayer lossless polarizer is shown for more clarity. The polarizer comprises a stack of alternating layers of birefringent film 60 and isotropic film 62 . The polarizer has a transmission axis AB. If unpolarized light 63 is incident on a broadband multilayer lossless polarizer, part of the light 64 having a polarization (b-type polarization state) approximately perpendicular to said transmission axis AB is reflected from the broadband multilayer lossless polarizer while having Another portion of light 65 with a polarization approximately parallel to said transmission axis AB (a-type polarization state) is transmitted through the broadband multila...
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Abstract
The present invention relates to the field of color filters, in particular, to a non-absorbing polarization color filters and to high-brightness color liquid crystal display panel with improved image contrast employing non-absorbing polarization color filters and light recycling among neighboring subpixels. The disclosed invention represents a non-absorbing polarization color filter comprising the following elements: a rear broadband multilayer lossless polarizer, a front broadband multilayer lossless polarizer, and a color polarization rotator. The rear broadband multilayer lossless polarizer has a predefined-oriented transmission axis AB. Said front broadband multilayer lossless polarizer is located approximately in parallel with the rear broadband multilayer lossless polarizer, and has a transmission axis approximately parallel or approximately orthogonal with respect to transmission axis AB. The color polarization rotator is located between the front broadband multilayer lossless polarizer and the rear broadband multilayer lossless polarizer. Said color polarization rotator comprises a stack of thin birefringent films with c-axes orientations alternated in sign according to a rocking angle a with respect to orientation of the transmission axis AB. A number, a rocking angle a, thicknesses and optical anisotropies of thin birefringent films are selected so, that the non-absorbing polarization color filter transmits a predetermined color light having the polarization state approximately parallel to transmission axis AB, reflects said predetermined color light having the polarization state orthogonal to the transmission axis AB, and reflects an unpolarized light of other predetermined color.
Description
[0001] Cross References to Related Applications [0002] This application claims the benefit of Application No. 60 / 562,916, filed April 15, 2004, the disclosure of which is hereby incorporated by reference under 35 U.S.C. §119(e). field of invention [0003] This invention relates to the field of color filters and, in particular, to non-absorptive polarizing filters and high brightness color with improved image contrast using non-absorptive polarizing filters and light recycling in adjacent sub-pixels LCD panel. Background of the invention [0004] There is a widespread need for flat liquid crystal display (LCD) panels capable of displaying video images with improved contrast. Examples of devices that require such a display configuration for direct viewing include notebook computers, laptop computers, and other computers. [0005] In general, prior art color LCD panels basically have the same basic construction. Each LCD display panel consists of the following main compon...
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IPC IPC(8): G02F1/1347G02B5/30
Inventor P·拉扎列夫M·V·波克施托L·D·西尔弗斯坦P·耶
Owner NITTO DENKO CORP