Display device
First Claim
Patent Images
1. A display device comprising:
- a pixel portion comprising a first thin film transistor; and
a switching regulator comprising;
a switching regulator control circuit comprising a second thin film transistor;
a switching element driven according to an output signal from said switching regulator control circuit to raise or lower a voltage; and
a capacitor electrically connected to the switching element,wherein the switching regulator control circuit is electrically connected to the capacitorwherein the first thin film transistor and the second thin film transistor are formed over a first substrate, andwherein the switching element is packed over a second substrate.
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Abstract
A display device according to the present invention includes a switching regulator control circuit formed of TFTs. A digital switching regulator control circuit is composed of an AD converter circuit, a CPU, a pulse generation circuit or the like. An analog switching regulator control circuit is composed of an error amplifier circuit, a triangle wave generation circuit, a PWM comparator or the like. By integrally forming the switching regulator control circuit on a display device, the problem of the conventional portable information equipment as to the reduction in size and weight can be solved.
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Citations
34 Claims
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1. A display device comprising:
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a pixel portion comprising a first thin film transistor; and a switching regulator comprising; a switching regulator control circuit comprising a second thin film transistor; a switching element driven according to an output signal from said switching regulator control circuit to raise or lower a voltage; and a capacitor electrically connected to the switching element, wherein the switching regulator control circuit is electrically connected to the capacitor wherein the first thin film transistor and the second thin film transistor are formed over a first substrate, and wherein the switching element is packed over a second substrate. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A display device comprising:
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a pixel portion comprising a first thin film transistor; and a switching regulator comprising; a switching regulator control circuit comprising a second thin film transistor; a switching element driven according to an output signal from said switching regulator control circuit to raise or lower a voltage; and a capacitor electrically connected to the switching element, wherein the switching regulator control circuit is electrically connected to the capacitor, wherein the first thin film transistor and the second thin film transistor are formed over a first substrate, and wherein the switching element and the capacitor are packed over a second substrate. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A display device comprising:
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a pixel portion comprising a first thin film transistor; and a switching regulator comprising; a switching regulator control circuit comprising a second thin film transistor; a switching element; an inductor; a diode; and a smoothing capacitor electrically connected to the switching element, wherein said switching regulator control circuit comprises; a voltage feed back circuit electrically connected to the smoothing capacitor; and a duty control circuit which controls a switching duty of said switching element, wherein the first thin film transistor and the second thin film transistor are formed over a first substrate, and wherein the switching element is packed over a second substrate. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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21. A display device comprising:
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a pixel portion comprising a first thin film transistor over a substrate; and a switching regulator comprising; a switching regulator control circuit comprising a second thin film transistor formed over the substrate; a switching element driven according to an output signal from said switching regulator control circuit to raise or lower a voltage; and a capacitor electrically connected to the switching element, wherein the switching regulator control circuit is electrically connected to the capacitor, wherein the first thin film transistor and the second thin film transistor are formed over a first substrate, wherein the switching element is packed over a second substrate, and wherein said switching regulator control circuit uses an analog signal. - View Dependent Claims (22, 23, 24, 25, 26, 27)
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28. A display device comprising:
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a pixel portion comprising a first thin film transistor over a substrate; and a switching regulator comprising; a switching regulator control circuit comprising a second thin film transistor formed over the substrate; a switching element driven according to an output signal from said switching regulator control circuit to raise or lower a voltage; and a capacitor electrically connected to the switching element, wherein the switching regulator control circuit is electrically connected to the capacitor, wherein the first thin film transistor and the second thin film transistor are formed over a first substrate, wherein the switching element is packed over a second substrate, and wherein said switching regulator control circuit uses a digital signal. - View Dependent Claims (29, 30, 31, 32, 33, 34)
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Specification