Projection type image display apparatus and image display system
First Claim
1. A projection type image display apparatus, comprising:
- an electroluminescence element having a plurality of pixels that can be individually modulated, in which the modulating pixels which generate and emit light by means of recombination of excitons formed by injecting electron charge carriers into a luminescent layer are two-dimensionally arranged, a projection optical system which projects light emitted from the individual modulated pixels of the electroluminescence element, a controller which generates drive signals to control the emission amount of the electroluminescence element, wherein an electroluminescence material used for the luminescent layer is a phosphorescent material which emits phosphorescence by priority, which is emitted from an excited triplet state, and the controller superimposes intermittent turning-on signals with predetermined cycles on emission amount modulating signals which modulate current values to be injected into the pixels according to display image signals.
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Abstract
A projection type image display apparatus which suppresses deterioration in luminous efficiency of an organic EL element and reduces flickering of projected images and an amplitude of a power supply capacity is disclosed. The apparatus comprises an electroluminescence (EL) element, a projection optical system, and a controller which generates drive signals to control the emission amount from the EL element. An EL material used for a luminescent layer of the EL element is a phosphorescent material which emits phosphorescence by priority, which is emitted from an excited triplet state. The controller generates drive signals by superimposing an intermittent turning-on signal on emission amount modulating signals to modulate current values to be injected into pixels according to display image signals.
26 Citations
16 Claims
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1. A projection type image display apparatus, comprising:
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an electroluminescence element having a plurality of pixels that can be individually modulated, in which the modulating pixels which generate and emit light by means of recombination of excitons formed by injecting electron charge carriers into a luminescent layer are two-dimensionally arranged, a projection optical system which projects light emitted from the individual modulated pixels of the electroluminescence element, a controller which generates drive signals to control the emission amount of the electroluminescence element, wherein an electroluminescence material used for the luminescent layer is a phosphorescent material which emits phosphorescence by priority, which is emitted from an excited triplet state, and the controller superimposes intermittent turning-on signals with predetermined cycles on emission amount modulating signals which modulate current values to be injected into the pixels according to display image signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A projection type image display apparatus, comprising:
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an electroluminescence element having pixels that can be individually modulated, where a luminescent layer of the electroluminescence element is formed of a material containing an organic fluorescent material or an organic phosphorescent material, a projection optical system which projects modulated light emitted from the respective pixels of the electroluminescence element, an element temperature detector which detects the temperature of the electroluminescence element, an outside air temperature detector which detects the outside air temperature, a cooling unit provided on a surface other than a light emitting surface of the electroluminescence element, and a controller which controls the cooling unit so that a temperature detected by the element temperature detector becomes equal to or lower than a temperature detected by the outside air temperature detector and the difference from the temperature detected by the outside air temperature falls within a predetermined range. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification