Display device

• US 7,483,005 B2
• Filed: 10/29/2004
• Issued: 01/27/2009
• Est. Priority Date: 10/31/2003
• Status: Active Grant

• Current Assignee: Japan Display Central Incorporated (Japan Display Incorporated)
• Original Assignee: Toshiba Matsushita Display Technology (Japan Display Incorporated)
• Inventors: Nakamura, Takashi, Hayashi, Hirotaka
• Primary Examiner(s): Hjerpe; Richard
• Assistant Examiner(s): Shapiro; Leonid
• Application Number:
  US10/975,378
• Publication Number:
  US 20050093851A1
• Time in Patent Office: 1,551 Days
• Field of Search: 345/87, 345/204, 345/104, 345/96
• US Class Current: 345/87
• CPC Class Codes: G02F 1/1362 Active matrix addressed cells G02F1/134336, G02F1/134363 take precedence
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/042 by opto-electronic means
• CPC Class Codes: G09G 2300/0809 Several active elements per pixel in active matrix panels
• CPC Class Codes: G09G 2300/0857 Static memory circuit, e.g. flip-flop
• CPC Class Codes: G09G 2310/0248 Precharge or discharge of column electrodes before or after applying exact column voltages
• CPC Class Codes: G09G 2310/027 Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
• CPC Class Codes: G09G 2310/0289 Details of voltage level shifters arranged for use in a driving circuit
• CPC Class Codes: G09G 2360/14 Detecting light within display terminals, e.g. using a single or a plurality of photosensors
• CPC Class Codes: G09G 3/3677 suitable for active matrices only
• CPC Class Codes: G09G 3/3688 suitable for active matrices only
• CPC Class Codes: G09G 5/14 Display of multiple viewports

Abstract

A display device has display elements provided inside of pixels formed in vicinity of signal lines and scanning lines aligned in matrix form, a plurality of image capture circuits, each capturing image at a certain range of a subject, and being provided one for every multiple pixels, a scanning line drive circuit which drives the scanning lines, a signal line drive circuit which drives the signal lines, a pixel voltage supply control circuit which controls whether or not to supply a pixel voltage to the corresponding signal line, and a pre-charge voltage supply control circuit which controls whether or not to supply a pre-charge voltage capable of changing voltage level for each signal line to the corresponding signal line.

Claims

1. A display device, comprising:

display elements provided in pixels formed in vicinity of signal lines and scanning lines aligned in a matrix form;

a plurality of light capturing circuits;

a first control line that controls an on/off operation of said display elements; and

a scanning line drive circuit which drives the scanning lines,

wherein each of said light capturing circuits includes,

a sensor element which converts external light into an electric signal; and

at least one of a second control line which controls an operation of said sensor element,

wherein said scanning line drive circuit includes,

a shift register including register circuits at a plurality of stages that shift a pulse signal with a prescribed pulse width in sync with pixel display timing; and

a supply control circuit which controls a plurality of control signal lines based on the output signals of said shift register,

wherein said sensor element is a photoelectric conversion element;

each of said light capturing circuits further includes;

an amplifier which amplifies an output of said photoelectric conversion element;

an output control transistor which connects or interrupts an output of said amplifier to a detection line;

a pre-charge transistor which initializes input of said amplifier;

a second control line which controls an on/off operation of said output control transistor; and

a third control line which controls an on/off operation of said pre-charge transistor,

said scanning line drive circuit including a supply control circuit which controls at least two signal levels among said first, second and third control lines.

2. A display device, comprising:

display elements provided in pixels formed in vicinity of signal lines and scanning lines aligned in a matrix form;

a plurality of light capturing circuits;

a first control line that controls an on/off operation of said display elements; and

a scanning line drive circuit which drives the scanning lines,

a level shift circuit which converts an output level of register circuits,

wherein each of said light capturing circuits includes,

a sensor element which converts external light into an electric signal; and

at least one of a second control line which controls an operation of said sensor element,

wherein said scanning line drive circuit includes,

a shift register including the register circuits at a plurality of stages which shift a pulse signal with a prescribed pulse width in sync with pixel display timing; and

a supply control circuit which controls a plurality of control signal lines based on the output signals of said shift register,

wherein said supply control circuit supplies the output signal of said level shift circuit to the corresponding first and second control lines based on logic of the control signal supplied from an outside device.