Self light emitting device and method of driving thereof
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorYoshifumi Tanada
Life of this patent
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Abstract
A self light emitting device having a function of correcting drops in brightness in self light emitting elements in a pixel portion, and capable of displaying a uniform image without brightness irregularities, is provided. A specific test pattern is displayed when an electric power source is connected, brightnesses are detected by photoelectric conversion elements arranged in each pixel, and then stored in a memory circuit. A correction circuit then corrects a first image signal based on portions which are insufficient from standard brightnesses (brightnesses of normal self light emitting elements at the same gray stale, stored in advance), and a second image signal is obtained. Display of an image in a display device is performed in accordance with the second image signal.
Claims29
A self light emitting device comprising:
- means for detecting brightnesses of self light emitting elements of pixels;
- means for storing the brightnesses;
- and
- means for correcting an image signal based on the stored brightnesses;
- wherein an image is displayed using the corrected image signal,
- wherein the correction means performs relative addition processing on image signals written into the pixels of the self light emitting elements which develop a reduction in brightness, with respect to image signals written into the pixels of the self light emitting elements which do not develop reduction in brightness.
A self light emitting device comprising:
- a brightness correction device having:
- photoelectric conversion elements for detecting brightnesses of self light emitting elements of pixels;
- a memory circuit for storing the brightnesses of the self light emitting elements of each of the pixels, detected by the photoelectric conversion elements;
- and
- a signal correction portion for correcting image signals that perform relative addition processing on image signals written into the pixels of the self light emitting elements which develop a reduction in brightness, with respect to image signals written into the pixels of the self light emitting elements which do not develop a reduction in brightness;
- and
- a display device for performing display of an image based on the second image signal.
A self light emitting device comprising:
- a brightness correction device having:
- j×k (where j and k are natural numbers) photoelectric conversion elements for detecting brightnesses of self light emitting elements of each pixels;
- a memory circuit for storing the brightnesses of the self light emitting elements of the pixels, detected by the photoelectric conversion elements;
- and
- a signal correction portion for correcting image signals that performs relative addition processing on image signals written into the pixels of the self light emitting elements which develop a reduction in brightness, with respect to image signals written into the pixels of the self light emitting elements which do not develop a reduction in brightness;
- and
- a display device having j×k pixels for performing display of an image based on the second image signal.
A self light emitting device according to any one of claims 9 and 24, wherein the memory circuit comprises a static memory circuit (SRAM).
A self light emitting device according to any one of claims 15 and 24, wherein the memory circuit comprises a dynamic memory circuit (DRAM).
A self light emitting device according to any one of claims 9 and 24, wherein the memory circuit comprises a ferroelectric memory circuit (FeRAM).
A self light emitting device according to any one of claims 9 and 24, wherein the memory circuit comprises a non-volatile memory (EEPROM) capable of being electrically written into, read out from, and erased.
A method of driving a self light emitting device comprising:
- detecting brightnesses of self light emitting elements of each pixel;
- storing the detected brightnesses of the self light emitting elements of the pixels;
- performing correction according to difference between the stored brightnesses of the self light emitting elements of each of the pixels, and standard brightnesses, and outputting a second image signal;
- and
- performing display of an image using the second image signal,
- wherein performing correction includes performing relative addition processing on image signals written into the pixels of the self light emitting elements which develop a reduction in brightness, with respect to image signals written into the pixels of the self light emitting elements which do not develop a reduction in brightness.
A method of driving a self light emitting device comprising:
- detecting brightnesses of self light emitting elements of each pixel by using photoelectric conversion elements;
- storing the brightnesses of the self light emitting elements of each of the pixels detected by the photoelectric conversion elements in a memory circuit;
- performing correction of a first image signal in a signal correction portion according to difference between the brightnesses of the self light emitting elements of each of the pixels stored in the memory circuit and standard brightnesses, and outputting a second image signal;
- and
- performing display of an image using the second image signal,
- wherein performing correction includes performing relative addition processing on image signals written into the pixels of the self light emitting elements which develop a reduction in brightness, with respect to image signals written into the pixels of the self light emitting elements which do not develop a reduction in brightness.
Dependencies are inferred from the claim text.