# US 2014/0192099 A1 · Method for uneven light emission correction of organic el panel and display correction circuit of organic el panel

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- Number: US 2014/0192099 A1
- Document ID: US20140192099A1
- Status: Published application
- Kind: A1
- Application number: 14/177,727
- Filed: 2014-02-11
- Published: 2014-07-10
- Earliest claimed: 2007-05-11
- Assignees: Sony Corporation
- Applicants: Sony Corporation
- Inventors: Yasuo Inoue; Ken Kikuchi; Takeya Meguro; Hideto Mori
- Web page: https://patentgrep.com/patent/US20140192099A1

## CPC

- G09G 3/3208: organic, e.g. using organic light-emitting diodes [OLED]
- G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element
- G09G 2300/08: Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
- G09G 2320/0223: Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes
- G09G 2320/0233: Improving the luminance or brightness uniformity across the screen
- G09G 2320/0276: for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
- G09G 2320/029: by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel
- G09G 2320/043: Preventing or counteracting the effects of ageing
- G09G 2320/0666: for control of colour parameters, e.g. colour temperature
- G09G 2320/103: Detection of image changes, e.g. determination of an index representative of the image change
- G09G 2360/16: Calculation or use of calculated indices related to luminance levels in display data
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)

## Abstract

A correction method for correcting uneven light emission of an organic EL panel, the correction method includes the steps of: supplying a predetermined signal to the organic EL panel to detect the brightness of the panel at horizontal and vertical scan positions; forming, based on a detection output thereof, correction data adapted to correct uneven brightness of the organic EL panel at a horizontal or vertical display position of the panel; storing the correction data in a memory; and reading the correction data from the memory during viewing to correct the level of a video signal supplied to the organic EL panel.

## Claims

### Claim 1

A display correction circuit of an organic EL panel, the display correction circuit comprising:
a signal forming unit configured to form a signal that is supplied to an organic EL panel and sequentially changes, for each predetermined scan position on the organic EL panel, a brightness level at the scan position;
a non-volatile memory configured to store first correction data and second correction data that correct, for each brightness level, uneven light emission in a horizontal direction and a vertical direction at the scan position on the organic EL panel, and third correction data that corrects uneven light emission which locally occurs on the organic EL panel, when the first correction data, the second correction data and the third correction data are formed from a detection output that detects brightness at the scan position for each change in the brightness level;
a correction circuit configured to correct a level of a video signal that is supplied to the organic EL panel;
a linear gamma circuit configured to receive a video signal that has been subjected to predetermined non-linear gamma correction, to cancel the gamma correction on the received video signal, to convert the received video signal to a video signal with a linear gamma property, and to output the converted video signal to the correction circuit; and
a panel gamma circuit configured to receive a video signal that is output from the correction circuit, to convert the received video signal to a video signal with a gamma property corresponding to a gamma property of the organic EL panel, and to output the converted video signal to the organic EL panel,
wherein the correction data is read from the memory during viewing,
wherein, with the read correction data, the first correction data and the second correction data are used to correct the uneven light emission that occurs in the horizontal direction and the vertical direction on the organic EL panel in accordance with the scan position and the brightness level, the third correction data is then used to correct the uneven light emission that locally occurs on the organic EL panel, and the panel gamma circuit is supplied with the level of the video signal output from the linear gamma circuit and received by the correction circuit,
wherein, when the level of the video signal output from the linear gamma circuit and received by the correction circuit does not correspond to a level of the signal formed by the signal forming unit, correction data corresponding to the level of the video signal obtained by interpolating each piece of correction data stored in the memory, output from the linear gamma circuit, and received by the correction circuit is formed, and
wherein the level of the video signal output from the linear gamma circuit and received by the correction circuit is corrected by the formed correction data.

### Claim 2 (depends on 1)

The display correction circuit of an organic EL panel according to claim 1, wherein the correction circuit includes:
a detection unit configured to detect a drive state or a drive history of the organic EL panel from the video signal received by the correction circuit, and
a correction unit configured to correct the video signal supplied to the organic EL panel with a detection output of the detection unit.