Image-forming element

Abstract

An image-forming element includes a plurality of pixels, and projects and displays light emitted from the pixels. The image-forming element includes a light emitting element which includes a light source emitting the light and a mounting substrate on which a plurality of light emitting elements are provided on a mounting surface. A plurality of light sources which are segmented and included in at least one pixel are provided, and each of the light sources includes power supply electrodes provided on the same surface or a surface facing the mounting substrate. The mounting substrate includes a drive circuit which drives the light source and electrodes which are provided on the mounting surface and are electrically connected to the power supply electrodes of the light source. In each pixel, an area occupation ratio of the light source with respect to a region area of the pixel is 15% or more and 85% or less. The drive circuit includes a switch circuit which selectively short-circuits the electrodes electrically connected to the power supply electrodes of the light source with other electrodes or wirings in the drive circuit, or at least one non-volatile memory transistor for adjusting a light emission intensity of the light emitting element.

1 . An image-forming element that includes a plurality of pixels and projects and displays light emitted from the pixels, the element comprising:
 a light emitting element which includes a light source emitting the light; and   a mounting substrate on which a plurality of light emitting elements are provided on a mounting surface,   wherein each of the light sources includes one or a plurality of power supply electrodes provided on a surface facing the mounting substrate,   wherein the mounting substrate includes a drive circuit which drives the light source and individual electrodes which are provided on the mounting surface and are electrically connected to the power supply electrodes of the light source, and   wherein the drive circuit includes a switch circuit which is disposed electrically in parallel with the light source.   
     
     
         2 . The image-forming element according to  claim 1 , wherein the mounting substrate includes a test signal line to turn on and off the switch circuit. 
     
     
         3 . The image-forming element according to  claim 1 , wherein the switch circuit is turned on in a test mode in which the drive circuit is tested. 
     
     
         4 . The image-forming element according to  claim 1 , wherein the light source includes two types of power supply electrodes for different polarities on the surface facing the mounting substrate. 
     
     
         5 . The image-forming element according to  claim 4 , wherein
 the mounting substrate includes the individual electrodes and a common electrode for different polarities on the mounting surface,   the individual electrodes and the common electrode are electrically connected respectively to the two power supply electrodes for different polarities, and   the switch circuit is disposed between the individual electrodes and the common electrode.   
     
     
         6 . The image-forming element according to  claim 1 ,
 wherein the mounting substrate includes a common electrode for a different polarity than the individual electrodes, and   wherein the switch circuit is disposed between the individual electrodes and wiring connected to the common electrode.   
     
     
         7 . The image-forming element according to  claim 1 , wherein the switch circuit is disposed between the individual electrodes and a ground line. 
     
     
         8 . The image-forming element according to  claim 1 , wherein each of the light sources is segmented. 
     
     
         9 . The image-forming element according to  claim 8 , wherein the light source, upon being determined in a test to be defective in light emission, is replaced with a normal light source”. 
     
     
         10 . The image-forming element according to  claim 7 , wherein each of the light sources is a vertical electrode chip including a light emitting layer interposed between the individual electrode and the common electrode for a different polarity than the individual electrode. 
     
     
         11 . The image-forming element according to  claim 1 ,
 wherein the mounting substrate is a semiconductor substrate, and   wherein the drive circuit, an array selection circuit which selects the pixels arranged in a predetermined direction, and a signal output circuit which outputs a drive signal to the drive circuit for driving the light source of the pixel selected by the array selection circuit are monolithically formed on the mounting substrate.   
     
     
         12 . The image-forming element according to  claim 1 , wherein the power supply electrodes of the light sources and the individual electrodes are connected via an anisotropic conductive film. 
     
     
         13 . The image-forming element according to  claim 12 , wherein the anisotropic conductive film is provided contiguously across the entire pixels. 
     
     
         14 . The image-forming element according to  claim 1 ,
 wherein the light emitting element further includes a wavelength conversion layer that converts the light emitted by the light source and emits converted light to outside, and   wherein the wavelength conversion layer is segmented for each light emitting element.   
     
     
         15 . The image-forming element according to  claim 14 ,
 wherein the light emitting element includes wavelength conversion layers which emit light having different wavelengths, and   wherein the wavelength conversion layers are segmented from each other.   
     
     
         16 . The image-forming element according to  claim 1 , wherein the light sources are separated from each other by a first light shielding layer having a light reflection property or a light absorption property. 
     
     
         17 . The image-forming element according to  claim 14 , wherein the wavelength conversion layers are separated from each other by a second light shielding layer having a light reflection property or a light absorption property. 
     
     
         18 . The image-forming element according to  claim 1 , wherein the drive circuit includes at least one non-volatile memory transistor for adjusting a light emission intensity of the light emitting element. 
     
     
         19 . The image-forming element according to  claim 1 ,
 wherein a plurality of light emitting elements with the same configuration are provided for each pixel, and   wherein the drive circuit includes at least one non-volatile memory transistor for selecting one of the plurality of light emitting elements with the same configuration.   
     
     
         20 . The image-forming element according to  claim 19 , wherein the plurality of light emitting elements with the same configuration include an integrated compound semiconductor layer.