Abstract A display system for displaying information in the viewfinder of a camera, capable of displaying a positive pattern indicating a distance measuring area and a light measuring area on a transparent background so that a photographing field can be seen through the transparent background of the pattern. The display system comprises a liquid crystal display of a guest-host type disposed near the focal plane of the optical system of the viewfinder. The liquid crystal display comprises transparent electrodes provided with a pattern indicating distance measuring areas and light measuring areas, a liquid crystal of a cholesteric-nematic phase transition type having a negative anistropic dielectric property as host, and a dichroic coloring matter having an anisotropic light absorption property as guest. The pattern having a high opacity is displayed on a transparent background in the viewfinder in a satisfactory contrast to the background.
Inventors
👤 Hiromu Mukai
👤 Kohtaro Hayashi
👤 Yasuo Maeda
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-29 01:18
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/18; G03B17/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
56 words
A display system for displaying information in a viewfinder of a camera, comprising: a first liquid crystal display for displaying information inside of the viewfinder image plane; a second liquid crystal display for displaying information outside of the viewfinder image plane; and means for driving the first and second liquid crystal displays at different duty cycles.
Claim 2
Dependent Claim
56 words
A display system for displaying information in a viewfinder of a camera, comprising: a first liquid crystal display for displaying information inside of the viewfinder image plane; a second liquid crystal display for displaying information outside of the viewfinder image plane; and means for driving the first and second liquid crystal displays at different duty cycles.
Claim 3
Dependent Claim
50 words
A display system according to claim 1, wherein the driving means drives the first liquid crystal display by applying a voltage continuously across electrodes of the first liquid crystal display and drives the second liquid crystal display by applying a voltage repetitively across electrodes of the second liquid crystal display.
Claim 4
Dependent Claim
35 words
A display system according to claim 1, wherein the first liquid crystal display displays a focus detecting area and the second liquid crystal display displays photographing information such as a shutter speed and an aperture.
Claim 5
Dependent Claim
28 words
A display system according to claim 1, wherein the first liquid crystal display is a guest-host type and the second liquid crystal display is a twist nematic type.