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Color liquid crystal display with internal rear polarizer

A technology of liquid crystal display and polarizer, which is applied in the direction of instruments, nonlinear optics, optics, etc., and can solve problems such as the decrease of contrast ratio

Inactive Publication Date: 2008-01-02
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A disadvantage of this design is the drop in contrast ratio, which is unavoidable for reflective displays without a rear polarizer

Method used

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  • Color liquid crystal display with internal rear polarizer
  • Color liquid crystal display with internal rear polarizer
  • Color liquid crystal display with internal rear polarizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0123] The characteristics of a transflective STN LCD are simulated. In the simulation, a full 4×4 propagation (full 4×4 propagation) matrix calculation method is adopted according to the Berreman calculation technique. Two cases are considered: The first case is the reflective mode of operation, using the rear internal polarizer. The internal polarizers are thin crystal film (TCF) polarizers manufactured from Optiva's proprietary materials. The second case, transmissive mode of operation, considers passing the backlight through a third ("C") polarizer for higher contrast. The third polarizer is molded into an additional TCF layer. TCF polarizers were purchased from Optiva Inc., South San Francisco, CA.

[0124] The simulated structure is shown in Figure 6D. The structure consists of a conventional high-efficiency front polarizer EG1224DU601, a 570nm retardation film 602, front and rear substrates 603 made of glass, a pair of transparent electrodes (ITO) 604, acrylic prote...

Embodiment 2

[0134] A transflective STN LCD was simulated using the design in Example 1 and the materials shown in Table 3.

[0135] Table 3 Materials used in the simulation

[0136] Material

model

thickness

reference index

ITO

20 Ohms

130nm

1.85@633nm

P.I.

Nissan SE 3510

40nm

Rolling speed -100rmp; friction speed 100mm / s

Friction gap-0.7mm; Rolling torque-0.1Kg f *cm

LC

ZLI-5100-000; forward tilt 4°; element gap 7.1 microns;

1 / 160 duty cycle, 1.7V~1.84V rms, d / p=0.53

Glass

0.7mm

1.51

reflector

A1

delayer

240 reverse twist (CCW)

O type polarizer

Sanritzu, HLC2-5618SY,

No AR layer

TCF

NO15.00

350nm

St'01

[0137] The rubbing directions of the front and rear alignment layers, the transmission axes of the inner rear and front polarizers, and the twist angle of the liquid crys...

Embodiment 3

[0142] Simulations of in-plane switching and optical compensation using the thin-crystalline films of the present invention were performed. Consider an initial in-plane LC director distribution at an angle of 45° to the in-plane electric field.

[0143] Figure 21 schematically shows the simulated design. In this design, considering the normal white mode of operation, the two polarizers are crossed, and the liquid crystal layer acts as a birefringent plate to produce a white appearance in the off state.

[0144] The simulated design includes a glass plate 2102 , a liquid crystal layer 2103 with a thickness of 1.9 microns, an alignment PI layer 2107 , and a yellow TCF compensation film 2105 . The intersection angle between the transmission axis of the front standard polarizer 2106 and the y coordinate axis is 0° to 10°. The intersection angle between the transmission axis of the rear standard polarizer 2104 and the y coordinate axis is 90°. The broad hollow arrow 2101 indicat...

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Abstract

A color liquid crystal display is provided comprising a front panel including at least one polarizer, a rear panel including at least one polarizer, liquid crystal placed between the front and rear panels, a reflective layer on the rear panel, and a matrix of color filters. The polarizer on the rear panel is an internal polarizer and placed before the matrix of color filters or between said matrix and the reflective layer. The combined thickness of all layers positioned between the matrix of color filters and the rear polarizer does not exceed 10 microns.

Description

[0001] related application [0002] This application claims priority to US Provisional Patent Application No. 60 / 419,321, filed October 16, 2002, the entire contents of which are hereby incorporated by reference into this specification. technical field [0003] The invention relates to the fields of liquid crystal displays and indicators, in particular to liquid crystal displays using polarizers. Background technique [0004] Liquid crystal displays (LCDs) have become an important hallmark of portable devices due to their low power consumption and small size compared to other current devices. Advances in liquid crystal display technology have enabled LCDs to produce high-quality color images while maintaining small size, light weight, low power consumption, and relatively low price. These features combine to significantly broaden the applications of LCDs, such as displays and indicators for portable computers, computing systems and equipment, as displays and indicators for...

Claims

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Application Information

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IPC IPC(8): G02F1/1335
Inventor M·V·波克施托L·D·西尔弗斯坦
Owner NITTO DENKO CORP