LIQUID CRYSTAL DISPLAY DEVICE AND ELECTRONIC DEVICE
1 Assignment
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Accused Products
Abstract
To provide a liquid crystal display device which can perform image display in both modes: a reflective mode where external light is used as an illumination light source; and a transmissive mode where a backlight is used. In one pixel, a region where incident light through a liquid crystal layer is reflected to perform display (reflective region) and a region through which light from the backlight passes to perform display (transmissive region) are provided, and image display can be performed in both modes: the reflective mode where external light is used as an illumination light source; and the transmissive mode where the backlight is used as an illumination light source. In addition, two transistors connected to respective pixel electrode layers are provided in one pixel, and the two transistors are separately operated, whereby display of the reflective region and display of the transmissive region can be controlled independently.
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Citations
18 Claims
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1. (canceled)
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2. A display device comprising:
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a display portion comprising; a first transistor; a transparent pixel electrode electrically connected to the first transistor; a second transistor; and a reflective pixel electrode electrically connected to the second transistor, wherein the first transistor is electrically connected to a first scan line and a first signal line, wherein the transparent pixel electrode is configured to control a transmissive light intensity of a light-emitting element, wherein the second transistor is electrically connected to a second scan line and a second signal line, wherein the reflective pixel electrode is configured to control a reflective light intensity over the reflective pixel electrode, and wherein a channel forming region of the second transistor comprises an oxide semiconductor layer, and an image processing circuit comprising; a memory circuit configured to store image signals; and a comparison circuit configured to compare the image signals stored in the memory circuit and to detect a difference among the image signals, wherein when the comparison circuit detects the difference in successive frame periods, the image processing circuit is configured to output a first signal for a moving image to the first signal line and a second signal for a black state to the second signal line, and wherein when the comparison circuit does not detect the difference in successive frame periods, the image processing circuit is configured to output a third signal for a reflective image to the second signal line and stop of output of the third signal to the second signal line during a predetermined period. - View Dependent Claims (3, 4, 5, 6, 7)
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8. A display device comprising:
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a display portion comprising; a first transistor; a transparent pixel electrode electrically connected to the first transistor; and a second transistor; and a reflective pixel electrode electrically connected to the second transistor, wherein the first transistor is electrically connected to a first scan line and a first signal line, wherein the transparent pixel electrode is configured to control a transmissive light intensity of a light-emitting element, wherein the second transistor is electrically connected to a second scan line and a second signal line, wherein the reflective pixel electrode is configured to control a reflective light intensity over the reflective pixel electrode, and wherein a channel forming region of the second transistor comprises an oxide semiconductor layer, and an image processing circuit, wherein the image processing circuit is configured to output a first signal for a moving image to the first signal line and a second signal for a black state to the second signal line, and wherein the image processing circuit is configured to output a third signal for a reflective image to the second signal line. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification