Liquid crystal device, projection type display device and driving circuit

An active matrix panel on a panel substrate, comprising:

• an active display region including a plurality of substantially parallel source lines and substantially parallel gate lines crossing the source lines, the source and gate lines on the panel substrate, and a matrix of driving electrodes disposed at the intersection of source lines and gate lines and a thin film transistor for coupling a driving electrode to the corresponding source line and gate line, the active display region disposed in the central area of the panel substrate;
• at least one line driver circuit including complementary thin film transistors for driving one of the source lines and gate lines, the driver circuit disposed on the panel substrate in the area between the active display region and the periphery of the panel substrate;
• and
• the thin film transistors of the display region and the driver circuit having the same cross-sectional structure.

An active matrix liquid crystal display panel, comprising:

• a panel substrate having an active display region and at least one driver region;
• a plurality of substantially parallel source lines and substantially parallel gate lines crossing the source lines, the source and gate lines disposed on the panel substrate in the display region;
• a matrix of driving electrodes disposed at the intersection of source lines and gate lines;
• a matrix of thin film transistors formed at the intersection of the source lines and gate lines coupling an associated driving electrode to the corresponding source line and gate line as a switch;
• a driver circuit formed on the panel substrate in the driver region for driving at least one of the source lines and gate lines, the driver circuit including complementary P-type and N-type thin film transistors;
• the matrix of thin film transistors in the display region having the same cross-sectional structure as one of the P-type and the N-type thin/film transistors of the driver circuit;
• the panel substrate having a substantially rectangular shape with the display region disposed to the central portion of the substrate and the driver circuit disposed along one side of the rectangular panel;
• an opposed transparent substrate having at least one common electrode disposed thereon and spaced apart from the panel substrate;
• and
• a liquid crystal material in the space between the opposed substrates for forming a liquid crystal display panel.

A method of forming an active matrix panel on a panel substrate, comprising:

• selectively disposing a plurality of silicon thin film islands on the substrate for forming a plurality of thin film transistors as switching elements for the driving electrodes and complementary thin film transistors of a driver circuit;
• forming gate insulating films over the silicon thin film islands;
• selectively disposing a plurality of gate lines and gate electrodes extending to the silicon thin film islands to be gate electrodes of the thin film transistors;
• doping impurities into the silicon thin film using the gate electrodes as a mask to form source and drain regions for the thin film transistors;
• depositing an insulating film across the surface of the substrate;
• forming trough holes through the insulating films to expose the source and regions;
• selectively depositing a plurality of substantially parallel source lines to electrically couple with the source region of each thin film transistor;
• electrically connecting the driver circuit to one of the source and gate lines;
• and
• selectively forming transparent driving electrodes at each thin film transistor switch element and coupling the driving electrodes to the drain region of the thin film transistor.

A method of forming an active matrix panel including an active display region and at least one driver region formed on a panel substrate, comprising:

• disposing a silicon thin film over the panel substrate to form islands for forming complementary thin film transistors of a first and a second different conductivity types in the driver circuit region and thin film transistor switches in the display region;
• forming gate insulating films over the silicon thin films;
• selectively depositing gate electrodes on the gate insulating films;
• doping impurities of a first conductivity type into the silicon thin film regions;
• covering the first conductivity type thin film transistors in the driver circuit region by a photo-resist;
• implanting impurities of the second conductivity type at a higher concentration than that of the first conductivity type to the uncovered silicon thin film islands in the driver circuit and in the display region;
• removing the photo-resist;
• forming an insulating film across the surface of the substrate;
• forming through holes in the source regions and drain regions;
• depositing source lines to the source regions for coupling the driver circuit to the thin film transistor switching element;
• and
• depositing driving electrode coupled to the drain regions of the respective thin film transistor switching elements.

An electronic view finder including an active matrix display for viewing the image viewed by an image sensing means and recorded by recording means, including a video signal processing circuit coupled to the image sensing means for generating a composite video signal, comprising:

• a view finder driving circuit having a chroma circuit, a synchronized timing signal formation circuit, a liquid crystal panel driving signal formation circuit, a power source circuit and a back-light driving circuit;
• a light source for providing back-light to the active matrix display;
• a reflector for reflecting the light to the display;
• and
• an active matrix display panel for displaying the video signal including an active matrix of driving electrodes coupled to a plurality of source lines and gate lines by thin film transistors and a driving circuit including a static shift register disposed on the same substrate as the display region.

A projection type color display device utilizing a white light luminous source for projecting a light toward a blue, a green and a red dichroic mirror for reflecting the light components to a blue, a green and a red liquid crystal light valve, respectively, and the modulated blue, green and red light passing through a dichroic prism system for projecting a synthesized color image, the light valves comprising:

• an active matrix display region formed on a substrate, the display region including a plurality of substantially parallel source lines and substantially parallel gate lines crossing the source lines, the source and gate lines disposed on the panel substrate in the display region;
• a matrix of driving electrodes disposed at the intersection of source lines and gate lines;
• a matrix of thin film transistors formed at the intersection of the source lines and gate lines coupling an associated driving electrode to the corresponding source line and gate line as a switch;
• and
• a driver circuit formed on the panel substrate adjacent to the display region for driving at least one of the source lines and the gate lines, the driver circuit including complementary P-type and N-type thin film transistors in which the matrix of thin film transistors in the display region has the same cross-sectional structure as one of the P-type and N-type thin film transistors of the driver circuit.