Grid-Shaped Touch Electrode Structure for OLED Display

The continuous metal grid structure is segmented into multiple isolated metal grid portions within each touch-control sub-electrode. These portions are arranged in a periodic pattern and are electrically insulated from each other, transforming the continuous conductor into a distributed array of discrete conductive elements. This segmentation reduces the overall parasitic capacitance while maintaining sufficient electrical conductivity for touch detection, and simultaneously improves optical performance by reducing brightness attenuation and visual distortions.

Different regions of the touch-control electrode are designed with different metal grid configurations. The metal grid portions are periodically arranged with specific area ratios (10%-25%) optimized for different functional requirements: regions requiring higher conductivity have denser grid arrangements, while regions requiring better optical performance have sparser arrangements. This local optimization allows simultaneous achievement of electrical and optical performance goals in different areas.

The metal grid structure is divided into multiple small isolated portions rather than one large continuous grid. This segmentation allows the total metal area ratio to be optimized at a lower level (10%-25%) while still achieving sufficient touch sensitivity through the distributed arrangement of multiple portions across the electrode area. The segmented structure reduces light blocking compared to an equivalent area continuous grid.

The electrode design transitions from considering only the two-dimensional area ratio of metal grids to incorporating the spatial distribution dimension. By periodically arranging metal grid portions in specific patterns across the electrode surface, the design optimizes both electrical performance (through distributed capacitance) and optical performance (through reduced light blocking), achieving a balance that simple area ratio optimization cannot accomplish.

The periodic arrangement of metal grid portions uses asymmetric positioning patterns that avoid alignment with the regular pixel structures of OLED displays. By deliberately designing non-uniform periodic patterns that do not coincide with pixel boundaries or sub-pixel arrangements, the design prevents the formation of regular dark etch patterns (dot-shaped, line-shaped, or block-shaped), thereby improving display image uniformity while maintaining touch sensitivity.

The periodic arrangement of isolated metal grid portions, which creates openings in the conductive layer, is designed to convert the potential harm of visible grid patterns into a benefit. By optimizing the period, size, and distribution of these portions, the design reduces parasitic capacitance for improved touch sensitivity while simultaneously minimizing visual artifacts. The periodic structure itself becomes beneficial when properly configured to avoid resonance with pixel structures.