Patent ID: 8294644
Filing Date: 2012-10-23
Classification: G09G

Abstract:
1. A light-emitting display having a plurality of elements, each element including a light-emitting means that emits light when a current flows through it, having a current control means arranged in a non-current mirror configuration that is connected in series with the light-emitting means, a control line being connected to a control electrode of the current control means via a first switching means that is controlled by a first switching signal, wherein a signal holding means is connected to the control electrode of the current control means in such a manner that a control signal that is applied to the control electrode of the current control means is maintained when the first switching means interrupts the connection between the control line and the control electrode of the current control means, wherein the control line is connected to a common circuit point of the current control means and of the light-emitting means via a single second switching means that is controlled by a second switching signal, wherein a control circuit is provided for controlling the first and the second switching means, wherein the control line is switchably connected to means for measuring a current in said current control means, to means for measuring a voltage developed in said light emitting means and to means for applying a DC voltage to said control electrode of said current control means, wherein the elements have an associated memory that stores measured values in a retrievable manner, wherein the control circuit is adapted to provide a first operating mode, in which a control voltage is applied to the control electrode of the current control means of an element via the first switching means, in which the means for measuring the current are connected, via the second switching means and the control line, to the common circuit point of the current control means and of the light-emitting means of the element, for measuring the current corresponding to the control voltage, and in which a plurality of measurements is carried out for different control voltages and corresponding currents, wherein the plurality of measured values are stored in the memory associated with the element.