Light emitting device and method of driving the same
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorHajime Kimura
Life of this patent
Estimating the term…
Abstract
The present invention specifies the characteristic of a driving transistor provided in a pixel and corrects a video signal to be inputted to the pixel based on the specification. As a result, a light emitting device and its driving method in which influence of fluctuation in characteristic among transistors is removed to obtain clear multi-gray scale are provided. The present invention can also provide a light emitting device and its driving method in which a change with age in amount of current flowing between two electrodes of a light emitting element is reduced to obtain clear multi-gray scale display.
Claims69
A light emitting device including a display panel with pixels each including a light emitting element, comprising:
- current measuring means for measuring a current value of the light emitting element in each of the pixels;
- memory means for storing an interpolation function for each of the pixels;
- and
- signal correcting means for correcting a video signal in each of the pixels using the interpolation function,
- wherein the interpolation function is obtained by substituting P and Q in an expression of Q=F(P) where F is the interpolation function, P is a value of the video signal, and Q is the current value corresponding to the video signal in each of the pixels.
A light emitting device including a display panel with pixels each including a light emitting element, comprising:
- current measuring means for measuring a current value of the pixels;
- calculating means for calculating an interpolation function for each of the pixels;
- memory means for storing the interpolation function for each of the pixels;
- and
- signal correcting means for correcting a video signal in each of the pixels using the interpolation function,
- wherein the interpolation function is obtained by substituting P and Q in an expression of Q=F(P) where F is the interpolation function, P is a value of the video signal, and Q is the current value corresponding to the video signal in each of the pixels.
A light emitting device for constituting a display panel with pixels each including a light emitting element, comprising:
- current measuring means for measuring a current value of the light emitting element in each of the pixels;
- memory means for storing an interpolation function for each of the pixels;
- and
- signal correcting means for correcting a video signal in each of the pixels using the interpolation function,
- wherein the interpolation function is obtained by substituting P and Q in an expression of Q=F(P) where F is the interpolation function, P is a value of the video signal, and Q is the current value corresponding to the video signal in each of the pixels.
A light emitting device for constituting a display panel with pixels each including a light emitting element, comprising:
- current measuring means for measuring a current value of the pixels;
- calculating means for calculating an interpolation function for each of the pixels;
- memory means for storing the interpolation function for each of the pixels;
- and
- signal correcting means for correcting a video signal in each of the pixels using the interpolation function,
- wherein the interpolation function is obtained by substituting P and Q in an expression of Q=F(P) where F is the interpolation function, P is a value of the video signal, and Q is the current value corresponding to the video signal in each of the pixels.
A light emitting device as claimed in 32,
- wherein the calculating means is a CPU or a microcomputer.
A light emitting device for constituting current measuring means, memory means and signal correcting means,
- wherein the current measuring means for measuring a current value of the light emitting element in each of the pixels;
- wherein the device comprises a display panel with pixels each including a light emitting element,
- wherein the memory means stores an interpolation function for each of the pixels of the display panel;
- wherein the signal correcting means corrects a video signal in each of the pixels using the interpolation function that is stored in the memory means;
- and
- wherein the interpolation function is obtained by substituting P and Q in an expression of Q=F(P) where F is the interpolation function, P is a value of the video signal, and Q is the current value corresponding to the video signal in each of the pixels.
A light emitting device for constituting current measuring means, calculating means, memory means, and signal correcting means,
- wherein the device comprises a display panel with pixels each including a light emitting element, and
- wherein the current measuring means measures a current value of the pixels in each of the pixels, the calculating means calculates an interpolation function for each of the pixels using an output of the current measuring means;
- wherein the memory means stores the interpolation function, and the signal correcting means corrects a video signal in each of the pixels using the interpolation function that is stored in the memory means;
- and
- wherein the interpolation function is obtained by substituting P and Q in an expression of Q=F(P) where F is the interpolation function, P is a value of the video signal, and Q is the current value corresponding to the video signal in each of the pixels.
Dependencies are inferred from the claim text.