Display panel and display panel manufacturing method
View Patent ↗A display panel enabling constraint of void formation between substrates and minimizing the effect of any voids formed, has for at least one pixel, a distance between the element surface and the element opposing surface corresponding to each light-emitting element of the pixel that is smaller than a distance between the inter-pixel surface and the inter-pixel opposing surface in an inter-pixel area between neighboring pixels, and smaller than a distance between the inter-element surface and the inter-element opposing surface corresponding to the light-emitting elements, and on the element substrate, the distance between neighboring pixels is greater than a distance between neighboring light-emitting elements, and a distance between the inter-pixel surface and the inter-pixel opposing surface is greater than a maximum distance between the inter-element surface and the inter-element opposing surface.
1. A display panel, comprising:
an element substrate having a plurality of pixels, each pixel having at least one light-emitting element;
an opposing substrate arranged to face the element substrate; and
a sealing resin layer interposed between and adjoining the element substrate and the opposing substrate, respective surfaces of the element substrate and the opposing substrate facing each other, and sealing the light-emitting elements, wherein
an element surface is defined as a top surface of the element substrate on one of the light-emitting elements,
an element-opposing surface is defined as a surface of the opposing substrate that is opposite the element surface,
an inter-pixel surface is defined as a top surface of the element substrate between neighboring pixels,
an inter-pixel opposing surface is defined as a surface of the opposing substrate opposite the inter-pixel surface,
an inter-element surface is defined as a top surface of the element substrate between neighboring light-emitting elements within one of the pixels,
an inter-element opposing surface is defined as a surface of the opposing substrate opposite the inter-element surface,
for at least one given pixel, a distance between the element surface and the element-opposing surface corresponding to each of the light-emitting elements of the given pixel is smaller than:
a distance between the inter-pixel surface and the inter-pixel opposing surface in an inter-pixel area between the given pixel and at least one neighboring pixel; and
a distance between the inter-element surface and the inter-element opposing surface corresponding to the light-emitting elements of the given pixel, and
on the element substrate, the distance between the given pixel and the neighboring pixel is greater than a distance between one of the light-emitting elements of the given pixel and a neighboring light-emitting element of the given pixel, and a distance between the inter-pixel surface and the inter-pixel opposing surface in an expansion is greater than a maximum distance between the inter-element surface and the inter-element opposing surface, the expansion being located between the given pixel and the neighboring pixel.
2. The display panel of claim 1 , wherein
an element substrate reference surface is defined as a surface of the element substrate located on the inter-pixel area and nearest the opposing substrate,
the element substrate has primary recesses each located on one of the light-emitting elements and recessed with respect to the element substrate reference surface, a bottom of each primary concavity being the element surface and the element substrate reference surface being the inter-pixel surface,
an opposing substrate reference surface is defined as a surface of the opposing substrate opposite the element substrate reference surface, and
the opposing substrate has primary protrusions each located opposite one of the primary recesses and protruding from the opposing substrate reference surface, a top face of each primary protrusion being the element-opposing surface and the opposing substrate reference surface being the inter-pixel opposing surface.
3. The display panel of claim 1 , wherein the light-emitting elements are formed between partition walls.
4. The display panel of claim 3 , wherein the partition walls are of uniform height.
5. The display panel of claim 1 , wherein an auxiliary electrode is provided between the pixels.
6. The display panel of claim 2 , wherein the light-emitting elements of the pixels each emit a different color of light.
7. The display panel of claim 6 , wherein the colors of light emitted by the light-emitting elements of the pixels are at least three in number.
8. The display panel of claim 1 , wherein each one of the light-emitting elements is an electroluminescence light-emitting element.
9. The display panel of claim 6 , wherein
the opposing substrate includes a plurality of color filters arrayed in correspondence with the different colors of light emitted by the light-emitting elements, and
the primary protrusions of the opposing substrate are the color filters.
10. The display panel of claim 9 , wherein
the opposing substrate includes a black matrix partitioning the color filters in correspondence with the colors of light, and
the opposing substrate reference surface is a surface of the black matrix facing the element substrate.
11. The display panel of claim 1 , wherein the expansion is located at an approximate midpoint of the inter-pixel area.
12. The display panel of claim 9 , wherein the primary protrusions corresponding to the color filters each protrude with respect to the opposing substrate reference surface to a different degree, such that the distance between the element surface and the element-opposing surface is minimized at a middle light-emitting element for each of the pixels.
13. The display panel of claim 1 , wherein for at least one given pixel, the distance between the element surface and the element-opposing surface corresponding to each of the light-emitting elements of the given pixel is greater than a distance between neighboring light-emitting elements of the given pixel.