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Back-lit displays with high illumination uniformity

A display panel and display unit technology, applied in nonlinear optics, instruments, optics, etc., can solve problems such as expensive manufacturing and increased manufacturing costs

Inactive Publication Date: 2008-06-11
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

They are more expensive to manufacture and add to the manufacturing cost since the diffusion pattern must be aligned with the illumination source when assembled
In addition, custom extruded composite diffusers are required to uniformly disperse the diffuser particles in the polymer matrix, which further increases the manufacturing cost

Method used

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  • Back-lit displays with high illumination uniformity
  • Back-lit displays with high illumination uniformity
  • Back-lit displays with high illumination uniformity

Examples

Experimental program
Comparison scheme
Effect test

example 7

[0078] The model of Example 7 was a flat surface, which was used for comparison. 6A and 6B each show a polar plot of light transmittance through a diffusing layer for various T values. FIG. 6A shows the angle-dependent transmittance in Example 7 as a flat surface. FIG. 6B shows the angle-dependent transmittance in Example 2 where 30% of the cells are flat parts and the rib part has a vertex angle of 140°. The angle is measured in a plane perpendicular to the direction of the rib. Table II shows the reference numbers for the curves with various T values.

[0079] Table II: T values ​​for the curves in Figure 6A and Figure 6B

[0080] T(％)

Figure 6A

Figure 6B

50

602

622

65

604

624

70

606

626

71

608

628

75

610

630

78

612

632

85

614

634

90

616

6...

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Abstract

A directly illuminated display unit has a light source unit that includes one or more light sources capable of producing illumination light for illuminating a display panel. A diffuser layer is disposed between the light source unit and the display panel. At least one of a first brightness enhancing layer and a reflective polarizer is disposed between the diffuser layer and the display panel. A light-diverting surface is disposed between the diffuser layer and the light source unit. The light-diverting surface diverts a propagation direction of at least some of the illumination light passing from the light source unit to the diffuser layer.

Description

technical field [0001] This invention relates to optical displays, and more particularly to liquid crystal displays (LCDs) that are directly illuminated from the back by a light source, such as may be used in LCD monitors and LCD televisions. Background technique [0002] Some display systems, such as liquid crystal displays (LCDs), are backlit. Such displays are widely used in a variety of devices such as laptop computers, handheld calculators, electronic watches, televisions, and the like. Some backlit displays include a light source positioned to the side of the display, with a light guide positioned to direct light from the light source to the back of the display panel. Other backlit displays, such as some LCD monitors and LCD televisions (LCD-TVs), are directly illuminated from the back using multiple light sources located behind the display panel. The latter arrangement is increasingly common for larger displays because the amount of optical power required to achieve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1335
CPCG02F1/133611G02B5/045G02F1/133606G02F2001/133607G02F1/133607G02F1/1335
Inventor 肯尼斯·A·爱泼斯坦
Owner 3M INNOVATIVE PROPERTIES CO