Light-switching device
AssigneeKoninklijke Philips Electronics N.V.
InventorsPaul Van Der Sluis, Mark Thomas Johnson, Anna-Maria Janner, Adrianus Sempel
Life of this patent
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Abstract
A matrix display (20) comprises pixels based on switching elements (30) which comprise a switchable layer which can be switched from one chemical state to another, the optical properties of said chemical states being different. Voltage-limiting devices (41, 42) preventing pixel degradation are arranged on the switching elements (30).
Claims10
A device (20) comprising an array of pixels based on switching elements (30) that are reversibly switchable between at least a first and a second chemical state, said first and second chemical states differing in optical properties, said pixels being switched by supplying a switching current to a stack of layers including a switchable layer (3) of an optically switchable material which brings about a switch from said first chemical state to said second chemical state, and a driving circuit (24, 25) for switching said pixels, wherein the device has, for at least some of said pixels, at least one voltage-limiting device (41, 42, 60, 62) arranged to ensure voltage across said stack of layers is optimal for preventing degradation.
A display device (20) comprising pixels based on switching elements (30) that are reversibly switchable between at least a first chemical state and, a second chemical state, said first and second chemical states differing in optical properties, said switching elements (30) being switched by supplying a switching current to a stack of layers including a switchable layer (3) of an optically switchable material which brings about a switch from said first chemical state to said second chemical state, and a driving circuit (24, 25) for switching said pixels, wherein the display device has, for at least some of said pixels, at least two voltage-limiting device (41, 42, 60, 61) arranged in parallel on said stack of layers.
Dependencies are inferred from the claim text.