Method for displaying images on a large-screen organic light-emitting diode display, and display used therefore

• US 20040233125A1
• Filed: 06/04/2003
• Published: 11/25/2004
• Est. Priority Date: 05/23/2003
• Status: Abandoned Application

• Current Assignee: Naamloze Vennootschap Barco
• Original Assignee: Naamloze Vennootschap Barco
• Inventors: Thielemans, Robbie, Tanghe, Gino, Willem, Patrick
• Application Number:
  US10/453,618
• Publication Number:
  US 20040233125A1
• Time in Patent Office: Days
• US Class Current: 345/1.3
• CPC Class Codes: G06F 3/1446 display composed of modules, e.g. video walls
• CPC Class Codes: G09G 2300/026 Video wall, i.e. juxtaposition of a plurality of screens to create a display screen of bigger dimensions
• CPC Class Codes: G09G 2310/0251 Precharge or discharge of pixel before applying new pixel voltage
• CPC Class Codes: G09G 2310/0256 with the purpose of reversing the voltage across a light emitting or modulating element within a pixel
• CPC Class Codes: G09G 2320/0276 for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
• CPC Class Codes: G09G 2320/041 Temperature compensation
• CPC Class Codes: G09G 2320/043 Preventing or counteracting the effects of ageing
• CPC Class Codes: G09G 2320/0626 for control of overall brightness
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 2360/144 the light being ambient light
• CPC Class Codes: G09G 2360/147 the originated light output being determined for each pixel
• CPC Class Codes: G09G 3/2014 by modulation of the duration of a single pulse during which the logic level remains constant
• CPC Class Codes: G09G 3/3216 using a passive matrix
• CPC Class Codes: H10K 59/18 Tiled displays

Abstract

Method for displaying images on a large-screen organic light-emitting diode display, characterized in that use is made of an organic light-emitting diode (OLED) display (100) comprising an array of OLED display tiles (140) that are each formed of an array of smaller OLED display modules (130), each OLED display module (130) comprising a number of OLED pixels, wherein each OLED display module (130) includes an intelligent OLED module processing system (210), whereby, in order to display the images, data concerning the image to be displayed, provided by a general processing unit, in other words a system controller, are transmitted to tile processing systems (220) and from each tile processing system (220) towards the respective modules (130).

Claims

1. Method for displaying images on a large-screen organic light-emitting diode display, characterized in that use is made of an organic light-emitting diode (OLED) display (100) comprising an array of OLED display tiles (140) that are each formed of an array of smaller OLED display modules (130), each OLED display module (130) comprising a number of OLED pixels, wherein each OLED display module (130) includes an intelligent OLED module processing system (210), whereby, in order to display the images, data concerning the image to be displayed, provided by a general processing unit, in other words a system controller, are transmitted to tile processing systems (220) and from each tile processing system (220) towards the respective modules (130).

2. Method according to claim 1, characterized in that said tile processing systems (220) are serially coupled and in that the data of the general processing unit are transmitted through the subsequent tile processing systems (220).

3. Method according to claim 1 or 2, characterized in that the general processing unit provides RGB data and control (CNTL) data, whereby data from the RGB data are collected at each individual tile processing system and/or module processing system as a function of control signals generated by means of said control (CNTL) data.

4. Method according to claims 2 and 3, characterized in that each tile processing system (220) stores the serial RGB data for the particular frame that corresponds to the physical position of the concerned tile (140) within the display (100).

5. Method according to claim 4, characterized in that each tile processing system (220) parses the received RGB data into specific packets associated with the corresponding OLED module processing systems (210).

6. Method according to any of the preceding claims, characterized in that said OLED module processing systems (210) make decisions regarding the amount of current to use when driving each OLED pixel in a module (130).

7. Method according to claim 6, characterized in that said OLED module processing systems (210) use data collection devices and algorithms in order to make said decisions.

8. Method according to any of the preceding claims, characterized in that in the module processing systems (210) at least the time each individual pixel is “

on”

is monitored and recorded, whereby the obtained values are used to carry out adjustments when driving the concerned OLED pixels in a module (130).

9. Method according to any of the preceding claims, characterized in that in the module processing systems (210) at least the amount of current which was used to drive each OLED during the “

on”

time is monitored and recorded, whereby the obtained values are used to carry out adjustments for subsequently driving the concerned OLED pixels in a module (130).

10. Method according to any of the preceding claims, characterized in that, with regard to the drive of the OLED pixels, one or more adjustments are made at the corresponding tile processing system (220) and/or at the corresponding module processing system (210) itself.

11. Method according to any of the preceding claims, characterized in that, when driving the respective OLED pixels or OLEDs, adjustments are made taking at least one of the following factors into account:

age, temperature, color contrast, gamma value.

12. Method according to any of the preceding claims, characterized in that in each module processing system (210), more particularly in a pre-processor (340) of the module processing system (210), use is made of existing color correction data which are red in from values stored in the module processing system (210), as well as of system-level color correction values.

13. Method according to any of the preceding claims, characterized in that in use color measurements are taken, and in that in each OLED module processing system (210) the amount of time is determined that has been elapsed since the last color measurements were taken, whereby this time is compared with a set value, whereby in case that this time is longer than said set value, a new measurement is carried out.

14. Method according to any of the preceding claims, characterized in that the OLEDs are driven by means of current sources, and in that in each OLED module processing system (210) the voltage across the current source (430) of the worst OLED (420) is compared to a pre-stored minimum threshold voltage value, and if said voltage is lower than the threshold voltage value, an adjustment of the power supply voltage is carried out.

15. Method according to claim 14, characterized in that an aging factor for each pixel is determined, in order to allow further calculation corrections, whereby said aging factor is determined after having carried out said adjustment of the power supply voltage.

16. Method according to any of the claims 1 to 14, characterized in that in each OLED module processing system (210) an aging factor is calculated for each OLED (420) and in that this aging factor is compared to a pre-determined maximum, and if the calculated aging factor is larger than the pre-determined maximum, an adjustment of the power supply voltage for said OLED is carried out.

17. Large-screen organic light-emitting diode display, more particularly for realizing the method according to any of claims 1 to 16, characterized in that this display (100) comprises an array of OLED display tiles (140) that are each formed of an array of smaller OLED display modules (130), wherein each OLED display module (130) includes at least one intelligent OLED module processing system (210).

18. Large-screen organic light-emitting diode display according to claim 17, characterized in that it is configured such that the size and dimension can be changed by adding or removing tiles (140).

19. Large-screen organic light-emitting diode display according to claim 17 or 18, characterized in that it is configured such that the modules (130) are replaceable.

20. Large-screen organic light-emitting diode display according to claims 17 to 19, characterized in that each tile (140) comprises a tile processing system (220), coupled to the respective modules (130) and in communication with each of the OLED module processing systems (210), wherein the tile processing systems (220) and the OLED module processing systems (210) comprise electronics configured so as to carry out the method of any of the claims 1 to 16.