Backplane device

Patent metadata

Field	Value
Publication number	US-9860943-B2
Application number	US-201113820395-A
Country	US
Kind code	B2
Filing date	Sep 1, 2011
Priority date	Sep 1, 2010
Publication date	Jan 2, 2018
Grant date	Jan 2, 2018

Abstract

The present invention relates to a backplane device for a light source matrix. A light source is preferably a LED or an OLED. A pixel circuitry of the backplane device is assigned to a light source of the light source matrix for controlling the light source. One light source and one pixel circuitry constitute a pixel. The pixels of the light source matrix are classified according to a pixel characteristic. The order of switching the light sources on and/or off depends on the pixel characteristic and not necessarily on the location of the pixel on the backplane device. A current being applied to the light sources is controlled by at least one driver. The at least one driver is electrically connectable to at least one pixel. The at least one driver is not belonging to the pixel circuitry of the pixel.

First claim

The invention claimed is:

1. A backplane device for a light source matrix, comprising:
one or more pixels, each pixel comprising:
a light source comprising an LED or an OLED;
pixel circuitry corresponding to said light source, wherein the pixel circuitry of each pixel is assigned only to its corresponding light source for controlling said light source;
the pixels of the light source matrix are classified according to a pixel characteristic;
the order of switching light sources on or off depends on the characteristics of a pixel and not on a location of the pixel on the backplane device, where the single pixels of the light source matrix are addressed in a random access manner to the backplane device;
a current being applied to each light source is controlled by at least one driver;
the at least one driver is electrically connectable to at least one pixel; and
the at least one driver does not belong to the pixel circuitry of the pixel.

2. The backplane device according to claim 1 , wherein a pixel value to be assigned to a pixel depends on at least one of the following: the current to be applied to the light source of the pixel and the duration for which current is applied to the light source of the pixel.

3. The backplane device according to claim 1 , wherein the light source or an LED or an OLED comprises a threshold value and wherein the pixel characteristic is the threshold value of such a light source.

4. The backplane device according to claim 1 , wherein the pixel characteristic is the brightness or the current value with which the light source of the pixel is to be operated.

5. The backplane device according to claim 4 , wherein the light source of the pixel is to be operated for a pre-determinable time period.

6. The backplane device according to claim 1 , wherein an addressing of the pixels for an enablement or a disablement of the pixels is carried out for the pixels comprising essentially the same pixel characteristics or wherein the addressing of the pixels comprising the same pixel value is performed in temporal proximity to each other in one operation mode of the backplane device or wherein in another operation mode of the backplane device at essentially the same time or wherein in still another operation mode of the backplane device in at least one of the following: a period of time and a time a pixel value is assigned to only one pixel.

7. The backplane device according to claim 1 , wherein the at least one driver is adapted such that the current flowing through a light source comprises essentially a constant value or wherein the at least one driver is adapted such that the current flowing through a light source comprises essentially a constant value during a pre-determinable time period in which the pixel is activated.

8. The backplane device according to claim 1 , wherein a current characteristic is applied to pre-determinable light sources of the light source matrix, the current characteristic being at least one of the following: a current ramp up function and a current ramp down function and a saw-tooth like function, or wherein the current characteristic comprises a higher current value for a shorter predetermined activation time compared to the usual driving properties of the light sources or wherein the current characteristic comprises a lower current value for a longer predetermined activation time compared to the usual driving properties of the light sources.

9. The backplane device according to claim 1 , wherein a current characteristic is applied to pre-determinable light sources of the light source matrix, the current characteristic is variable in time and has predominantly the characteristic of a mathematically monotonic function or of a mathematically monotonic function being monotonic increasing or monotonic decreasing.

10. The backplane device according to claim 1 , wherein the generated current characteristic being applied to at least one analog line determines the order of addressing of the pixels.

11. The backplane device according to claim 1 , wherein pixel addresses being determined are generated for an x-direction and for a y-direction and wherein an assignment of a pixel value to a pixel is carried out in a random access manner with respect to the x-direction and to the y-direction.

12. The backplane device according to claim 1 , comprising at least one of the following: at least one enable line and at least one analog line, every pixel circuitry being connected to at least one of the following: to an enable line and to an analog line.

13. The backplane device according to claim 12 , wherein a pixel circuitry comprises three TFTs, wherein a first TFT is connected to the enable line, to an x-addressing line and to a second TFT, wherein the second TFT is connected to the first TFT, to a y-addressing line and to a third TFT, wherein the third TFT is connected to the second TFT and wherein the third TFT is adapted to switch electrical connection between the analog line through the light source to the ground.

14. The backplane device according to claim 12 , wherein a pixel circuitry comprises three TFTs, wherein for two pixels being located adjacent to each other and being addressed by the same y-addressing line, a first TFT of the first pixel is—as an enabling function—connected to the x-addressing line of the second pixel, to the y-addressing line and to a second TFT of the first pixel, wherein the second TFT of the first pixel is connected to the first TFT of the first pixel, to an x-addressing line of the first pixel and to a third TFT of the first pixel, wherein the third TFT of the first pixel is connected to second TFT of the first pixel and wherein the third TFT of the first pixel is adapted to switch an electrical connection between the analog line through the light source of the first pixel to the ground, wherein the first TFT of the second pixel is—as an enabling function—connected to the x-addressing line of the first pixel, to the y-addressing line and to the second TFT of the second pixel, wherein the second TFT of the second pixel is connected to the first TFT of the second pixel, to an x-addressing line of the second pixel and to the third TFT of the second pixel and wherein the third TFT of the second pixel is connected to the second TFT of the second pixel and wherein the third TFT of the second pixel is adapted to switch an electrical connection between the analog line through the light source of the second pixel to the ground.

15. The backplane device according to claim 12 , wherein a pixel circuitry comprises three TFTs, wherein for four pixels being located adjacent to each other and being addressed by the same y-addressing line, wherein a first TFT of the first pixel is—as an enabling function—connected to the x-addressing line of the third pixel, to the y-addressing line and to a second TFT of the first pixel, wherein the second TFT of the first pixel is connected to the first TFT of the first pixel, to an x-addressing line of the first pixel and to the third TFT of the first pixel, wherein a third TFT of the first pixel is connected to the second TFT of the first pixel and wherein the third TFT of the first pixel is adapted to switch an electrical connection between the analog line through the light source of the first pixel to the ground, wherein the first TFT of the second pixel is—as an enabling function—connected to the x-addressing line of the first pixel, to the y-addressing line and to the second TFT of the second pixel, wherein the second TFT of the second pixel is connected to the first TFT of the second pixel, to an x-addressing line of the second pixel and to

Assignees

• Missbach Robert
• Seereal Tech S A

Inventors

• Missbach Robert

Classifications

• G03H2001/0212

  Light sources or light beam properties (G03H1/06, G03H1/24 take precedence; corresponding details, see subgroups of G03H2222/00) · CPC title

• G09G3/2085

  Special arrangements for addressing the individual elements of the matrix, other than by driving respective rows and columns in combination · CPC title

• H05B33/08 Primary

  Electricity · mapped topic

• G09G2310/0259

  with use of an analog or digital ramp generator in the column driver or in the pixel circuit · CPC title

• G09G2300/0809

  Several active elements per pixel in active matrix panels · CPC title