Display device, and method of operation thereof
First Claim
1. A semiconductor device including a pixel portion and a driver circuit portion, the semiconductor device comprising:
- a first substrate;
a thin film transistor over the first substrate;
a first electrode electrically connected to the thin film transistor;
a light emitting layer over the first electrode, the light emitting layer comprising an organic compound;
a second electrode over the first electrode so that the light emitting layer is disposed between the first electrode and the second electrode;
a second substrate over the second electrode;
a sealing material interposed between the first substrate and the second substrate;
an insulating film over the second substrate; and
a conductive layer on the insulating film,wherein the driver circuit portion includes a control circuit comprising a frame memory, a determining circuit, and a converter circuit for controlling a grayscale of an inputted video signal, andwherein the control circuit is configured to increase a luminance of a high grayscale region of the pixel portion and reduce a luminance of a low grayscale region of the pixel portion by lower voltage value supplied to the first electrode in the low grayscale region when the luminance of the high grayscale region is increased.
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Abstract
It is an object of the invention to provide a display device which performs high grayscale display in accordance with display contents and a game machine with an improved realistic sensation. The invention is a display device characterized by including a pixel portion which performs display based on a video signal and a driver circuit portion inputted with the video signal, wherein the driver circuit portion has a unit for controlling a grayscale in accordance with display of the pixel portion. In a liquid crystal display device, luminance of a lighting unit is controlled based on a signal from the unit for controlling a grayscale whereas a current supplied to a light emitting element is controlled in a light emitting device. By applying such a display device to a game machine, a realistic sensation can be improved.
32 Citations
20 Claims
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1. A semiconductor device including a pixel portion and a driver circuit portion, the semiconductor device comprising:
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a first substrate; a thin film transistor over the first substrate; a first electrode electrically connected to the thin film transistor; a light emitting layer over the first electrode, the light emitting layer comprising an organic compound; a second electrode over the first electrode so that the light emitting layer is disposed between the first electrode and the second electrode; a second substrate over the second electrode; a sealing material interposed between the first substrate and the second substrate; an insulating film over the second substrate; and a conductive layer on the insulating film, wherein the driver circuit portion includes a control circuit comprising a frame memory, a determining circuit, and a converter circuit for controlling a grayscale of an inputted video signal, and wherein the control circuit is configured to increase a luminance of a high grayscale region of the pixel portion and reduce a luminance of a low grayscale region of the pixel portion by lower voltage value supplied to the first electrode in the low grayscale region when the luminance of the high grayscale region is increased. - View Dependent Claims (2, 3, 4, 5, 6, 13, 14, 15, 16)
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7. A semiconductor device including a pixel portion and a driver circuit portion, the semiconductor device comprising:
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a first substrate; a thin film transistor over the first substrate; a light emitting element electrically connected to the thin film transistor, wherein the light emitting element comprises; a first electrode; a light emitting layer over the first electrode, the light emitting layer comprising an organic compound; and a second electrode over the first electrode so that the light emitting layer is disposed between the first electrode and the second electrode; a second substrate over the second electrode; a sealing material interposed between the first substrate and the second substrate; an insulating film over the second substrate; and a conductive layer on the insulating film, wherein the driver circuit portion includes a control circuit comprising a frame memory, a determining circuit, and a converter circuit, and wherein the control circuit is configured to increase voltage value supplied to the first electrode of a first light emitting element in a high grayscale region of the pixel portion with reducing voltage value supplied to the first electrode of a second light emitting element in a low grayscale region of the pixel portion. - View Dependent Claims (8, 9, 10, 11, 12, 17, 18, 19, 20)
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Specification