LIGHT-EMITTING DEVICE, ELECTRONIC APPARATUS AND IMAGE PROCESSING DEVICE

Abstract

Provided is light-emitting device including: a plurality of light-emitting elements which correspond to pixels for configuring an image and emit light by being supplied electric energy; a first storage unit which stores a first correction value with respect to each of the plurality of light-emitting elements; a specifying unit which specifies a first mode or a second mode for each of a plurality of regions dividing the image; and a driving unit which supplies electric energy to each of the plurality of light-emitting elements according to the first correction value of the light-emitting element and image data of a corresponding pixel, for each pixel of a region which the specifying unit has specified as being in the first mode, and supplies electric energy to each of the plurality of light-emitting elements according to the image data of a corresponding pixel of a region which the specifying unit has specified as being in the second mode by a process different from that of the first mode.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be described with reference to the accompanying drawings, wherein like numbers reference like elements.

FIG. 1 is a block diagram showing the configuration of a light-emitting device according to the present invention.

FIG. 2 is a flowchart illustrating the operation of a control unit.

FIG. 3 is a conceptual diagram illustrating the reduction of an irregular gradation according to a first embodiment.

FIG. 4 is a block diagram showing the configuration of a light-emitting device according to a modified example of the first embodiment.

FIG. 5 is a graph showing a relationship between a correction value Aa and a correction value Ab in the modified example of the first embodiment.

FIG. 6 is a graph showing a spot region.

FIG. 7 is a conceptual diagram illustrating the reduction of an irregular gradation according to a second embodiment.

FIG. 8 is a waveform diagram of driving current according to a third embodiment.

FIG. 9 is a block diagram showing the configuration of a light-emitting device according to a modified example.

FIG. 10 is a cross-sectional view showing the configuration of an electronic apparatus (image forming apparatus according to the present invention.

Claims

1. A light-emitting device comprising: a plurality of light-emitting elements which correspond to pixels for configuring an image and emit light by being supplied electric energy;a first storage unit which stores a first correction value with respect to each of the plurality of light-emitting elements;a specifying unit which specifies a first mode or a second mode for each of a plurality of regions dividing the image; anda driving unit which supplies electric energy to each of the plurality of light-emitting elements according to the first correction value of the light-emitting element and image data of a corresponding pixel, for each pixel of a region which the specifying unit has specified as being in the first mode, and supplies electric energy to each of the plurality of light-emitting elements according to the image data of a corresponding pixel of a region which the specifying unit has specified as being in the second mode by a process different from that of the first mode.

2. The light-emitting device according to claim 1, wherein the image is formed by arranging lines including a plurality of pixels arranged in a first direction in correspondence with each of the light-emitting elements in a second direction crossing the first directions and wherein the specifying unit specifies the first mode or the second mode for each region dividing the image to a predetermined number of lines.

3. The light-emitting device according to claim 2, wherein the specifying unit specifies one of the first mode and the second mode for an odd line and specifies the other of the first mode and the second mode for an even line.

4. The light-emitting device according to claim 1, further comprising a second storage unit for storing a second correction value for each of the plurality of light-emitting elements, wherein the driving unit supplies electric energy to each of the plurality of light-emitting elements according to the second correction value of the light-emitting element and the image data of each pixel, for each pixel of a region which the specifying unit has specified as being in the second mode.

5. The light-emitting device according to claim 4, wherein the driving unit drives each of the light-emitting elements so that the light-emitting element emits an amount of light according to the image data by supplying a driving current set with a current value according to the first correction value of the corresponding light-emitting element, for each pixel of a region which the specifying unit has specified as being in the first mode, and drives each of the plurality of light-emitting elements so that the light-emitting element emits an amount of light according to the image data by supplying a driving current set with a pulse width according to the second correction value of the light-emitting element, for each pixel of a region which the specifying unit has specified as being in the second mode.

6. An electronic apparatus comprising the light-emitting elements according to claim 1.

7. An image processing apparatus in which each of a plurality of light-emitting elements corresponding to pixels for configuring an image is driven by supplying electric energy according to image data, the apparatus comprising: a first storage unit which stores a first correction value with respect to each of the plurality of light-emitting elements;a specifying unit which specifies a first mode or a second mode for each of a plurality of regions for dividing the image; anda correction unit which corrects image data of each pixel belonging to a region which the specifying unit has specified as being in the first mode according to the first correction value stored in the first storage unit and outputs the corrected image data to a light-emitting device, and outputs image data of each pixel belonging to a region which the specifying unit has specified as being in the second mode to the light-emitting device without executing the correction according to the first correction value.

8. The image processing apparatus according to claim 7, further comprising a second storage unit for storing a second correction value for each of the plurality of light-emitting elements, wherein the correction unit corrects the image data of each pixel belonging to the region which the specifying unit has specified as being in the second mode according to the second correction value stored in the second storage unit and outputs the corrected image data to the light-emitting device.