# US 2013/0154498 A1 · Backplane device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0154498 A1 - Document ID: US20130154498A1 - Status: Published application - Kind: A1 - Application number: 13/820,395 - Filed: 2011-09-01 - Published: 2013-06-20 - Earliest claimed: 2010-09-01 - Assignees: SeeReal Technologies S.A. - Inventors: Robert Missbach - Web page: https://patentgrep.com/patent/US20130154498A1 ## CPC - H05B 45/00: Circuit arrangements for operating light-emitting diodes [LED] - G09G 3/2081: {with combination of amplitude modulation and time modulation (space and time error diffusion G09G3/2066)} - G09G 3/2085: {Special arrangements for addressing the individual elements of the matrix, other than by driving respective rows and columns in combination} - G09G 3/325: the data current flowing through the driving transistor during a setting phase, e.g. by using a switch for connecting the driving transistor to the data driver - G09G 3/3266: Details of drivers for scan electrodes - G09G 3/3283: in which the data driver supplies a variable data current for setting the current through, or the voltage across, the light-emitting elements - H04N 13/286: having separate monoscopic and stereoscopic modes - G03H 2001/0212: {Light sources or light beam properties (G03H1/06, G03H1/24 take precedence; corresponding details, see subgroups of G03H2222/00)} - G09G 2300/0809: Several active elements per pixel in active matrix panels - G09G 2300/0814: used for selection purposes, e.g. logical AND for partial update - G09G 2310/0213: controlling the sequence of the scanning lines with respect to the patterns to be displayed, e.g. to save power - G09G 2310/0218: with collection of electrodes in groups for n-dimensional addressing - G09G 2310/0221: with use of split matrices (G09G3/3644 and G09G3/3666 take precedence) - G09G 2310/0227: related to multiple interlacing, i.e. involving more fields than just one odd field and one even field - G09G 2310/0259: with use of an analog or digital ramp generator in the column driver or in the pixel circuit - G09G 2310/0262: The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data electrodes - G09G 2310/0272: Details of drivers for data electrodes, the drivers communicating data to the pixels by means of a current - G09G 2320/043: Preventing or counteracting the effects of ageing - G09G 2330/021: Power management, e.g. power saving - H05B 45/60: Circuit arrangements for operating LEDs comprising organic material, e.g. for operating organic light-emitting diodes [OLED] or polymer light-emitting diodes [PLED] - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL - 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) - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION - G03H: HOLOGRAPHIC PROCESSES OR APPARATUS (holograms, e.g. point holograms, used as ordinary optical elements G02B5/32; producing stereoscopic or other three-dimensional effects G02B30/00; diffraction-grating systems G02B27/44; systems using moiré fringes G02B27/60; optical logic elements G02F3/00; stereo-photography G03B35/00; photosensitive materials or processes for photographic purposes G03C; {stereo-photographic or similar processes G03C9/00}; apparatus for processing exposed photographic materials G03D; analogue computers performing mathematical operations with the aid of optical elements G06E3/00; authentication by radiation, of concealed information carried by holograms or diffraction gratings G06K19/16; holographic storage G11B7/0065, G11C13/04; {stereoscopic or other three dimensional effects in television systems H04N13/00}) ## 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. ## Claims ### Claim 1 A backplane device for a light source matrix or for a light source matrix wherein a light source is a LED or an OLED, wherein a pixel circuitry of the backplane device is assigned to a light source of the light source matrix for controlling the light source, wherein one light source and one pixel circuitry constitute a pixel, wherein the pixels of the light source matrix are classified according to a pixel characteristic, wherein the order of switching the light sources on or off depends on the pixel characteristic and not necessarily on the location of the pixel on the backplane device, wherein a current being applied to the light sources is controlled by at least one driver, wherein the at least one driver is electrically connectable to at least one pixel and the at least one driver is not belonging to the pixel circuitry of the pixel. ### Claim 2 (depends on 1) 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. ### Claim 3 (depends on 1) 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. ### Claim 4 (depends on 1) 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. ### Claim 5 (depends on 4) The backplane device according to claim 4, wherein the light source of the pixel is to be operated for a pre-determinable time period. ### Claim 6 (depends on 1) 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. ### Claim 7 (depends on 1) 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. ### Claim 8 (depends on 1) 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. ### Claim 9 (depends on 1) 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. ### Claim 10 (depends on 1) 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. ### Claim 11 (depends on 1) The backplane device according to claim 1, wherein the pixel addresses being determined are generated for the x-direction and for the y-direction and wherein the 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. ### Claim 12 (depends on 1) 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. ### Claim 13 (depends on 1) The backplane device according to claim 1, comprising at least one pixel addressing means, wherein such a pixel addressing means comprises x-addressing lines and y-addressing lines, wherein every pixel circuitry is connected to an x-addressing line and to a y-addressing line. ### Claim 14 (depends on 1) The backplane device according to claim 1, wherein the pixel addressing means comprises at least one x-address decoder and at least one y-address decoder, the x-address decoder being connected to the x-addressing lines and the y-address decoder being connected to the y-addressing lines. ### Claim 15 (depends on 14) The backplane device according to claim 14, wherein at least one of the x-address decoder and the y-address decoder is arranged separately from the backplane device or wherein at least one of the x-address decoder and the y-address decoder is located at the outside edge of the backplane device or wherein at least one of the x-address decoder and the y-address decoder is located on the backplane device between the pixels. ### Claim 16 (depends on 12) The backplane device according to one of the claim 12, wherein a pixel circuitry comprises three TFTs, wherein the first TFT is connected to the enable line, to an x-addressing line and to the second TFT, wherein the second TFT is connected to the first TFT, to a y-addressing line and to the 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. ### Claim 17 (depends on 12) 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, the 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 the 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 the 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 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. ### Claim 18 (depends on 12) 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 the 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 the 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 the 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 the third TFT of the second pixel, 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, wherein the first TFT of the third pixel is—as an enabling function—connected to the x-addressing line of the fourth pixel, to the y-addressing line and to the second TFT of the third pixel, wherein the second TFT of the third pixel is connected to the first TFT of the third pixel, to an x-addressing line of the third pixel and to the third TFT of the third pixel, wherein the third TFT of the third pixel is connected to the second TFT of the third pixel, and wherein the third TFT of the third pixel is adapted to switch an electrical connection between the analog line through the light source of the third pixel to the ground, wherein the first TFT of the fourth pixel is—as an enabling function—connected to the x-addressing line of the second pixel, to the y-addressing line and to the second TFT of the fourth pixel, wherein the second TFT of the fourth pixel is connected to the first TFT of the fourth pixel, to an x-addressing line of the fourth pixel and to the third TFT of the fourth pixel, wherein the third TFT of the fourth pixel is connected to the second TFT of the fourth pixel, and wherein the third TFT of the fourth pixel is adapted to switch an electrical connection between the analog line through the light source of the fourth pixel to the ground. ### Claim 19 (depends on 12) The backplane device according to claim 12, wherein the first TFT of a pixel and the second TFT of the same pixel are combined into a dual gate TFT. ### Claim 20 (depends on 13, 19) The backplane device according to claim 13, wherein an x-addressing line or a y-addressing line is connected with the gate of the first TFT of a pixel or with the gate of the second TFT of the pixel or with the gates of the dual gate TFT according to claim 19. ### Claim 21 (depends on 12) The backplane device according to claim 12, wherein an enable line or the x-addressing line serving as an enable line is connected with the source of the first TFT of a pixel or wherein the drain of the first TFT of a pixel is connected to the source of the second TFT of the same pixel or wherein the drain of the second TFT of a pixel is connected to the gate of the third TFT of the same pixel. ### Claim 22 (depends on 12) The backplane device according to claim 12, wherein the analog line is connected to the source of the third TFT of a pixel and the light source of the same pixel being connected to the ground is connected with the drain of the third TFT of the same pixel or wherein the analog line being connected to the light source of a pixel is connected to the source of the third TFT of the same pixel and the ground is connected with the drain of the third TFT of the same pixel. ### Claim 23 (depends on 1) The backplane device according to claim 1, comprising a pixel measurement scheme including a measurement function of a pixel being applied during a predetermined time period or for a partial time of a frame time, the pixel measurement of a pixel is carried out with the help of the at least one driver being connected to the pixel. ### Claim 24 (depends on 23) The backplane device according to claim 23, wherein the gate of the transfer transistor of a pixel circuitry is connected to the enable line by addressing the x-addressing line and the y-addressing line of the pixel, wherein a variable voltage function is applied on the enable line, the variable voltage function comprising applying increasing or decreasing voltage values from a first voltage value to a second voltage value, and wherein a measuring means is adapted to measure at which voltage value of the variable voltage function a current flows or does not flow any more between the analog line through the light source of the pixel to the ground. ### Claim 25 (depends on 23) The backplane device according to claim 23, wherein the pixel circuitry of a pixel is addressed by the addressing means such that a current flow from the analog line through the light source of that pixel to ground is enabled, wherein a current function is applied on the analog line, the current function comprising applying increasing or decreasing current values from a first current value to a second current value, a measuring means measuring the actual current flowing between the analog line through the light source of the pixel to the ground. ### Claim 26 (depends on 1) The backplane device according to claim 1, comprising a circuitry being made of a-Si or a-Oxide or poly-Si or organic electronic material. ### Claim 27 (depends on 1) The backplane device according to claim 1, wherein at least one of the light source matrix and the backplane device comprises a cluster arrangement of at least two clusters of pixels and wherein each cluster comprises an analog line and a pixel addressing means for addressing the pixels of the cluster. ### Claim 28 (depends on 27) The backplane device according to claim 27, wherein the clusters are controlled independently from each other or wherein a plurality of pixels forming a connected or a contiguous region of the light source matrix form a cluster or wherein a plurality of pixels forming a connected or a contiguous region of the light source matrix form a cluster and wherein such a region comprises a rectangular shape or a square shape or a honeycomb shape or wherein a plurality of pixels forming a connected or a contiguous region of the light source matrix form a cluster and wherein a cluster does not extend over a full width or a full length of the light source matrix. ### Claim 29 (depends on 1) A light source matrix or a light source matrix for a display device for generating at least one of a two-dimensional and three-dimensional representation of a scene or of content, comprising a backplane device according to claim 1. ### Claim 30 (depends on 1, 29) A display Display device for generating at least one of a two-dimensional and three-dimensional representation of a scene or a stereoscopic or a holographic display device, comprising a backplane device according to claim 1 or comprising the light source matrix according to claim 29. ### Claim 31 (depends on 1) A method for operating a backplane device for a light source matrix or a method for operating a backplane device for a light source matrix wherein a light source is a LED or an OLED, or a method for operating the backplane device according to claim 1, wherein a pixel circuitry of the backplane device is assigned to a light source of the light source matrix for controlling the light source, wherein one light source and one pixel circuitry constitute a pixel, wherein the pixels of the light source matrix or of a cluster of the light source matrix are classified according to a pixel characteristic, wherein the order of switching the light sources on or off depends on the pixel characteristic and not necessarily on the location of the pixel on the backplane device, wherein a current being applied to the light sources is controlled by at least one driver, wherein the at least one driver is electrically connectable to at least one pixel and the at least one driver is not belonging to the pixel circuitry of the pixel. ### Claim 32 A backplane device for a light source array or a backplane device for a light source matrix or a backplane device for a light source matrix in a display device for generating at least one of a two-dimensional and three-dimensional representation of a scene or of content, the light source array or the light source matrix comprising pixels having pixel addresses and being electronically controllable by the backplane device for assigning pixel values to the pixels, the backplane device comprising at least one light source for each pixel, at least one analog line and at least one pixel addressing means, wherein such a pixel addressing means comprises x-addressing lines and y-addressing lines, wherein every pixel is connected to an analog line, to an x-addressing line and to a y-addressing line, wherein as a pixel value assigning scheme a generating means is adapted to generate a current characteristic to be applied to the at least one analog line such that the current characteristic depends on the pixel values to be assigned to the pixels, wherein the backplane device is adapted such that the pixel addresses are determined depending on the generated current characteristic as a pixel addressing scheme and such that the generated current characteristic is applied to the at least one analog line for the purpose of assigning the pixels value to the pixels.