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Luminous display and method for controlling the same

A light-emitting display, current control technology, applied in static indicators, instruments, etc., can solve the problem of not allowing permanent changes to the driving signal, reducing the effective area, etc.

Active Publication Date: 2010-10-13
INTERDIGITAL CE PATENT HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, measuring the characteristics of an OLED pixel cell during normal operation requires additional power, control, and measurement lines, which reduces the effective area through which light is emitted
On the other hand, using the same lines used for programming to measure during a specific measurement period (e.g. whenever the display is turned on) reduces the amount of additional lines but does not allow permanent changes to the drive signal

Method used

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  • Luminous display and method for controlling the same
  • Luminous display and method for controlling the same
  • Luminous display and method for controlling the same

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Embodiment Construction

[0015] In the light emitting display according to the first embodiment of the present invention, a plurality of pixel units 101, 201 are arranged in rows and columns. figure 1 Details of a light emitting display according to a first embodiment of the present invention are shown. In this figure, two adjacent rows of pixel cells 101, 201 of the display are shown. The pixel unit 101, 201 includes a light emitting element LE, a current control device CC and a third switch S3, which are connected in series between the ground and the power supply voltage VDD. The control terminals of the current control means CC of the pixel cells 101 , 201 arranged in the same column are switchably connected to the first data line DATA1 via the first switch S1 . The first data line DATA1 is used to program the current control device CC to provide the desired current. The number of first data lines DATA1 is preferably equal to the number of columns in the display. Further, signal holding means SH...

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Abstract

A luminous display includes pixels arranged in rows and columns. Control signals (CTRL2) that are used for controlling first switches (S2) for measuring parameters of pixel cells in a first row are also used to control second switches (S1) for programming pixel cells in a second row. In this way it is possible to use a single control signal for selecting one pixel cell for programming and simultaneously selecting another pixel cell for measuring (S1, S2). Programming and measuring are thus performed in a time staggered manner, while the addressing is moved to the respective next row. The programming is preferably voltage programming (Vprog). In one embodiment the current through the pixel cell that is currently programmed is interrupted. In another embodiment the measuring is performed only after the transient current into signal holding means coupled to current control means has set.

Description

technical field [0001] The present invention relates to a light emitting display, in particular to a light emitting display comprising an OLED, or an organic light emitting diode, for controllably emitting light. The invention further relates to a method for controlling a display according to the invention. Background technique [0002] OLED pixel cells suffer from degraded performance throughout the life of the display due to aging. Further, the electro-optical characteristics of the pixel cells may vary across the display screen due to defects in the manufacturing process. To compensate for this effect, in particular for OLED pixel cells driven with voltage, it is common to measure the characteristics of the pixel cell and to modify the drive signal. Using a drive voltage instead of a control current to drive an OLED pixel cell allows for faster setting of the desired amount of light to be emitted. However, measuring the characteristics of an OLED pixel cell during norm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/32
CPCG09G2320/043G09G2300/0861G09G2320/0295G09G3/3233G09G2320/029G09G2300/0842
Inventor 托马斯·施瓦南伯格海因里希·谢曼西洛·马克思
Owner INTERDIGITAL CE PATENT HLDG