Transflector

• US 4,040,727 A
• Filed: 09/10/1975
• Issued: 08/09/1977
• Est. Priority Date: 09/10/1975
• Status: Expired due to Term

• Current Assignee: Rockwell International Corporation
• Original Assignee: Rockwell International Corporation
• Inventors: Ketchpel, Richard D.
• Primary Examiner(s): Evans, F. L.
• Application Number:
  US05/612,121
• Time in Patent Office: 699 Days
• Field of Search: 350/288, 350/291, 350/172, 350/173, 350/174
• US Class Current: 349/114
• CPC Class Codes: G02B 5/00 Optical elements other than lenses light guides G02B6/00; optical logic elements G02F3/00
• CPC Class Codes: G02F 1/133555 Transflectors
• CPC Class Codes: G02F 2203/09 transflective

Abstract

There is provided an efficient semi-transparent reflector (transflector) which reflects direct light under normal, ambient light conditions but permits back lighting of a display, such as an LCD display, under dark ambient light conditions. Such a "transflector" is inexpensive to manufacture and provides an efficient device in which the pattern and body color of the reflector can easily be changed.

Claims

1. A transflector comprising,

a sheet of light transmitting material having an undulating surface, and

a discontinuous film of light reflecting material on said surface of said sheet forming a plurality of islands which exhibit a fissured pattern running in one direction across said sheet,

said film arranged to reflect substantial portions of incident light to prevent incident light from passing through said sheet and to permit light to be transmitted through said sheet from a light source behind said sheet.

2. The transflector recited in claim 1 wherein

said islands are formed of metals and oxides of semiconductors, deposited on said surface of said sheet.

3. The transflector recited in claim 2 wherein

said metal is a light reflective metal.

4. The transflector recited in claim 1 wherein

said discontinuous film comprises discrete portions which are arranged at an angle relative to each other.

5. The transflector recited in claim 1 wherein

said sheet comprises a transparent plastic material.

6. The transflector recited in claim 1 wherein

said surface of said sheet has a wavelength of about 200 to 600 microns between crests of raised portions thereof and said crests have an amplitude of at least 4% of the wavelength.

7. The transflector recited in claim 1 wherein

said surface exhibits a random variation in the wavelength, amplitude and orientation thereof.

8. The transflector recited in claim 1 wherein

said sheet is fabricated of vinyl, and said surface of said sheet is calendared.

9. The transflector recited in claim 4 wherein, said discrete portions which are arranged at an angle relative to each other exhibit different colors.