Active matrix display apparatus

• US 6,479,940 B1
• Filed: 09/14/2000
• Issued: 11/12/2002
• Est. Priority Date: 09/17/1999
• Status: Expired due to Fees

• Current Assignee: Pioneer Corporation
• Original Assignee: Pioneer Corporation
• Inventors: Ishizuka, Shinichi
• Primary Examiner(s): Wong, Don
• Assistant Examiner(s): TRAN, THUY V
• Application Number:
  US09/662,347
• Time in Patent Office: 789 Days
• Field of Search: 315/169.1, 315/169.3, 345/207, 345/214, 345/55, 345/76, 345/77
• US Class Current: 315/169.3
• CPC Class Codes: G09G 2300/0842 forming a memory circuit, e.g. a dynamic memory with one capacitor
• CPC Class Codes: G09G 2320/041 Temperature compensation
• CPC Class Codes: G09G 2320/043 Preventing or counteracting the effects of ageing
• CPC Class Codes: G09G 2320/0606 Manual adjustment
• CPC Class Codes: G09G 2320/0626 for control of overall brightness
• CPC Class Codes: G09G 2330/02 Details of power systems and of start or stop of display operation
• CPC Class Codes: G09G 2360/144 the light being ambient light
• CPC Class Codes: G09G 2360/18 Use of a frame buffer in a display terminal, inclusive of the display panel
• CPC Class Codes: G09G 3/2022 using sub-frames
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element

Abstract

An active matrix display apparatus includes a light-emitting panel including a plurality of light-emitting devices arranged in a matrix configuration and driving devices for selectively allowing each of the plurality of light-emitting devices to emit light. A control circuit is provided for controlling the driving devices in accordance with an input video signal. A light adjustment signal generating circuit for generating a light adjustment signal to designate a display luminance of the light-emitting panel. A variable power source supplies an electric power variable with a magnitude according to the light adjustment signal to the plurality of light-emitting devices.

Claims

1. An active matrix display apparatus comprising:

a light-emitting panel including a plurality of light-emitting devices arranged in a matrix configuration and driving devices for selectively allowing each of said plurality of light-emitting devices to emit light;

a control circuit for controlling said driving devices in accordance with an input video signal;

a light adjustment signal generating circuit for generating a light adjustment signal to designate a display luminance of said light-emitting panel; and

a variable power source for supplying electric power of a magnitude according to said light adjustment signal to said plurality of light-emitting devices.

2. An apparatus according to claim 1, wherein said variable power source is a variable voltage source to generate a voltage which changes in accordance with a control signal.

3. An apparatus according to claim 1, further comprising a temperature detector for detecting a temperature of an environment where said light-emitting panel is placed,

and wherein said light adjustment signal generating circuit includes a correcting circuit for correcting said light adjustment signal in accordance with a detection signal from said temperature detector.

4. An apparatus according to claim 1, further comprising photometer for measuring a brightness of an environment here said light-emitting panel is placed,

and wherein said light adjustment signal generating circuit includes a correcting circuit for correcting said light adjustment signal in accordance with a detection signal from said photometer.

5. An apparatus according to claim 1, wherein a light emission period of said plurality of light-emitting devices is determined on the basis of a subfield 2ⁿ gradation method.

6. An apparatus according to claim 1, wherein said plurality of light-emitting devices are organic electroluminescence devices.

7. An active matrix display apparatus including a plurality of light-emitting devices arranged in a matrix configuration and driving devices for selectively allowing each of said plurality of light-emitting devices to emit light, comprising:

a light adjustment signal generating circuit for generating a light adjustment signal to designate a display luminance of said display apparatus; and

a voltage converting circuit for converting a predetermined voltage into a voltage of a magnitude according to said light adjustment signal and supplying the converted voltage to said plurality of light-emitting devices.

8. An apparatus according to claim 7, wherein said plurality of light-emitting devices are organic electroluminescence devices.

9. An active matrix display apparatus including a plurality of light-emitting devices arranged in a matrix configuration and driving devices for selectively allowing each of said plurality of light-emitting devices to emit light, comprising:

a voltage converting circuit for receiving a light adjustment signal to designate a display luminance of said display apparatus, converting a predetermined voltage into a voltage of a magnitude according to said light adjustment signal, and supplying the converted voltage to said plurality of light-emitting devices.

10. An apparatus according to claim 9, wherein said plurality of light-emitting devices are organic electroluminescence devices.