Image display device
First Claim
1. An image display device, comprising:
- a plurality of picture elements for display which are arranged in a matrix pattern;
a signal supplying circuit for supplying a signal to said picture elements;
a first transistor for changing a display state of said picture elements according to a change in its threshold voltage, said first transistor being provided to said picture elements or said signal supplying circuit;
a second transistor which is formed on a substrate where said first transistor is formed and has the approximately same threshold voltage as said first transistor; and
a power supply circuit having a reference voltage generating circuit for generating a reference voltage based upon the threshold voltage of said second transistor and a current supplying circuit for supplying a current to said signal supplying circuit based upon the output of said reference voltage generating circuit.
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Accused Products
Abstract
In an image display device, a reference voltage generating circuit of a power supply circuit, which applies power supply voltages VGH and VGL to a scan signal line driving circuit, is formed on a substrate where picture elements for display are formed, and a transistor which composes the reference voltage generating circuit has the approximately same threshold voltage as a picture element transistor TR.sub.(PIX) which composes the picture elements for display. As a result, the power supply voltages VGH and VGL to the scan signal line driving circuit automatically obtain which is optimized for a characteristic of the transistor TR(PIX) which composes the picture elements for display. Therefore, the power supply voltages VGH and VGL do not require adjustment per picture element array or every time when the usage environment is changed. As a result, the cost of adjustment is reduced and convenience of the usage is improved.
62 Citations
13 Claims
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1. An image display device, comprising:
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a plurality of picture elements for display which are arranged in a matrix pattern; a signal supplying circuit for supplying a signal to said picture elements; a first transistor for changing a display state of said picture elements according to a change in its threshold voltage, said first transistor being provided to said picture elements or said signal supplying circuit; a second transistor which is formed on a substrate where said first transistor is formed and has the approximately same threshold voltage as said first transistor; and a power supply circuit having a reference voltage generating circuit for generating a reference voltage based upon the threshold voltage of said second transistor and a current supplying circuit for supplying a current to said signal supplying circuit based upon the output of said reference voltage generating circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification