DISPLAY

• US 20110069051A1
• Filed: 09/10/2010
• Published: 03/24/2011
• Est. Priority Date: 09/18/2009
• Status: Abandoned Application

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Ono, Munenori, Uchino, Katsuhide, Nakamura, Kazuo, Hasegawa, Hiroshi
• Application Number:
  US12/879,563
• Publication Number:
  US 20110069051A1
• Time in Patent Office: Days
• US Class Current: 345/207
• CPC Class Codes: G09G 2320/029 by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel
• CPC Class Codes: G09G 2320/048 using evaluation of the usage time
• CPC Class Codes: G09G 2360/145 the light originating from the display screen
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element

Abstract

A display unit including a display region including a plurality of luminescence elements, a non-display region including a plurality of luminescence elements and a photoreception element, a drive unit connected to each of the luminescence elements in the display region, a photoreception drive circuit connected to the plurality of luminescence elements in the non-display region, and a photoreception processing unit which receives a signal output from each of the plurality of luminescence elements in the non-display region and outputs a degradation signal to the drive unit, the drive unit providing a signal to the plurality of luminescence elements in the display region based on the degradation signal.

Claims

1. A display unit comprising:

a display region including a plurality of luminescence elements;

a non-display region including a plurality of luminescence elements, each with a corresponding photoreception element associated therewith;

a drive unit connected to each of the luminescence elements in the display region; and

a photoreception processing unit which receives a signal from each of photoreception elements and outputs a degradation signal to the drive unit based on the signals received,

wherein,

the drive unit provides a drive signal to the plurality of luminescence elements in the display region based on the degradation signal.

2. The display device of claim 1, wherein a photoreception drive unit provides a constant signal to each of the plurality of luminescence elements in the non-display area.

3. The display device of claim 1, wherein the drive unit provides at least two different constant signals to at least two of the plurality of luminescence elements in the non-display area.

4. The display device of claim 1, further comprising a memory unit connected between the photoreception processing unit and the drive unit and which stores the degradation signal before forwarding the degradation signal to the drive unit.

5. The display unit of claim 1, wherein

the photoreception processing unit determines the degradation signal based on the equation

D_i=D_s^{n(Yi, Ys)},

where, D_i is a degradation rate of one of the plurality of luminescence elements in the non-display region, D_s is a degradation rate of a reference luminescence elements, and n(Yi,Ys) is an exponentiation factor of luminance of one of the plurality of luminescence elements in the non-display region with respect to a reference luminescence element selected by the photoreception processing unit.

6. The display device of claim 5, wherein

the photoreception processing unit determines the exponentiation factor based on the equation

7. The display device of claim 6, wherein the reference luminescence element is one of the plurality of pixels in the non-display region.

8. The display device of claim 6, wherein a constant sampling time period separates the time Tk from the time Tk−

1 as defined by the equation

T_k=T<sub>k−

1</sub>+Δ

T,

where, Δ

T is a constant time span.

9. The display device of claim 8, wherein the time span Δ

T is a variable time span.

11. The method of claim 1, wherein a photoreception drive unit provides a constant signal to each of the plurality of luminescence elements in the non-display area.

12. The method of claim 11, wherein a photoreception drive unit provides at least two different signals to at least two of the plurality of luminescence elements in the non-display area.

10. A method of adjusting the luminance of a display device which includes (a) a display region having a plurality of luminescence elements and (b) a non-display region having a plurality of luminescence elements and a photoreception element, the method comprising the steps of:

providing a control signal from a photoreception drive circuit to the plurality of luminescence elements in the non display region;

receiving a signal output from each of the plurality of luminescence elements in the non-display region in a photoreception processing unit and determining a degradation signal for the luminescence elements in the non display region;

outputting the degradation signal to the drive unit; and

adjusting the signal sent from the drive unit to the luminescence elements in the display region by the degradation signal.

13. The method of claim 10, further comprising a memory unit connected between the photoreception processing unit and the drive unit which stores the degradation signal before forwarding the signal to the drive unit.

14. The method of claim 10, wherein

the photoreception processing unit determines the degradation signal based on the following equation

D₁=D_s^{(Yi, Ys)},

where, D_i is a degradation rate of one of the plurality of luminescence elements in the non-display region, D_s is a degradation rate of a reference luminescence elements, and n(Yi,Ys) is an exponentiation factor of luminance of one of the plurality of luminescence elements in the non-display region with respect to a reference luminescence element selected by the photoreception processing unit.

15. The method of claim 14, wherein

the photoreception processing unit determines the exponentiation factor based on the following equation

16. The method of claim 15, wherein the reference luminescence element is one of the plurality of pixels in the non-display region.

17. The method of claim 15, wherein a constant sampling time period separates the time Tk from the time Tk−

1 as defined by the following equation

T_k=T<sub>k−

1</sub>+Δ

T,

where, Δ

T is a constant time span.

18. The method of claim 17, wherein the time span Δ

T is a variable time span.