Semiconductor integrated circuit, self-luminous display panel module, electronic apparatus, and method, for driving power supply line

Patent metadata

Field	Value
Publication number	US-10186201-B2
Application number	US-201715492670-A
Country	US
Kind code	B2
Filing date	Apr 20, 2017
Priority date	Oct 2, 2008
Publication date	Jan 22, 2019
Grant date	Jan 22, 2019

Abstract

A semiconductor integrated circuit and corresponding display panel and electronic apparatus. A pixel element includes a self-luminous element and a drive transistor connected to a power supply line. In an emission period of the self-luminous element, an active voltage and an intermediate voltage are sequentially applied between the power supply line and a potential line with a pulse-shaped waveform such that a predetermined luminance duration is obtained in the emission period. In a non-emission period of the self-luminous element, an off-state voltage is applied between the power supply line and the potential line so as to maintain the self-luminous element in a non-emission state.

First claim

What is claimed is:

1. A light emitting apparatus comprising:
an organic electroluminescent (EL) panel; and
control circuitry,
wherein the organic EL panel includes an organic EL element; and
the control circuitry is configured to
drive the organic EL element so as to control a voltage between an anode electrode and a cathode electrode of the organic EL,
repeatedly switch between an active state and an intermediate state in an emission period, wherein in the active state the organic EL element emits light and in the intermediate state the organic EL element is turned off without receiving a reverse-bias potential at the anode electrode, and
variably change a ratio of a first period corresponding to the active state and a second period corresponding to the intermediate state,
wherein the ratio is determined according to a condition based on a result of a motion detection based on an input signal.

2. The light emitting apparatus according to claim 1 , wherein the control circuitry is configured to variably change an active voltage that is applied between the anode electrode and the cathode electrode, based on the condition.

3. The light emitting apparatus according to claim 1 , wherein the input signal is an input image data and the result of the motion detection is determined based on a motion amount of the input image data.

4. The light emitting apparatus according to claim 3 , wherein the control circuitry includes a frame memory for storing the input image data, and the result of the motion detection is determined based comparison between two frames of the image data at least one of which is stored in the frame memory.

5. The light emitting apparatus according to claim 1 , wherein the condition is further based on a user preference obtained through an input device.

6. The light emitting apparatus according to claim 5 , wherein the input device is an operation screen.

7. The light emitting apparatus according to claim 1 , wherein the condition is further based on an ambient light intensity obtained through an illuminance sensor.

8. The light emitting apparatus according to claim 7 , wherein the illuminance sensor includes a photodiode and an amplifier circuit.

9. A driving device for a light-emitting element, comprising:
a power supply line and a potential line coupled to the light-emitting element, the light-emitting element being connected between the power supply line and the potential line;
a control circuit configured to drive at least the power supply line so as to control a voltage between the power supply line and the potential line;
wherein the control circuit is configured to:
in an emission period of the light-emitting element, sequentially apply an active voltage and an intermediate voltage between the power supply line and the potential line, with a pulse-shaped waveform such that a predetermined luminance duration is obtained in the emission period, and
variably change a ratio of a first period corresponding to the application of the active voltage and a second period corresponding to the application of the intermediate voltage,
wherein the ratio is determined according to a result of a motion detection based on an input signal.

10. The driving device according to claim 9 , wherein the control circuitry is configured to variably change the active voltage, according to a condition that is based upon the result of the motion detection.

11. The driving device according to claim 9 , wherein the input signal is an input image data and the result of the motion detection is determined based on a motion amount of the input image data.

12. The driving device according to claim 11 , wherein the control circuitry includes a frame memory for storing the input image data, and the result of the motion detection is determined based comparison between two frames of the image data at least one of which is stored in the frame memory.

13. The driving device according to claim 9 , wherein the ratio is further based on a user preference obtained through an input device.

14. The driving device according to claim 13 , wherein the input device is an operation screen.

15. The driving device according to claim 9 , wherein the ratio is further based on an ambient light intensity obtained through an illuminance sensor.

16. The driving device according to claim 15 , wherein the illuminance sensor includes a photodiode and an amplifier circuit.

Assignees

• Sony Corp

Inventors

• Hasegawa Hiroshi
• Isobe Teppei

Classifications

• G09G2320/103

  Detection of image changes, e.g. determination of an index representative of the image change · CPC title

• G09G2330/028

  Generation of voltages supplied to electrode drivers in a matrix display other than LCD · CPC title

• G09G2310/08

  Details of timing specific for flat panels, other than clock recovery · CPC title

• G09G3/3233 Primary

  with pixel circuitry controlling the current through the light-emitting element · CPC title

• G09G2310/06

  Details of flat display driving waveforms · CPC title