Obviousness

As a technical patent analyst, I will analyze the obviousness of US patent 10541279 under 35 U.S.C. § 103 based on the provided text, specifically noting the "Prior Art keywords" and "Prior art date" from the Google Patents metadata.

Limitation on Prior Art References:

A comprehensive obviousness analysis under 35 U.S.C. § 103 typically requires identifying specific prior art documents (e.g., other patents, scientific publications) that disclose the elements of the claimed invention. The "Prior art section of this page" in the provided patent information lists "Prior art keywords: layer, thickness, conductive layer, conductive, display device" and "Prior art date: 2016-07-29." This metadata does not provide specific prior art references that can be combined to render the claims obvious. Therefore, I cannot identify combinations of specific prior art references to fully execute a traditional obviousness analysis.

Instead, I will describe the key distinguishing features of the patent's claims and explain how a hypothetical obviousness argument would be constructed if appropriate prior art documents were available, drawing on the problem-solution context provided within the patent itself.

Analysis of Claim 1 of US10541279B2:

The independent claim 1 of US10541279B2 recites:
"1. A display device comprising:
a display panel; and
a touch sensing unit on the display panel, the touch sensing unit including:
a first conductive pattern on the display panel;
an insulating layer covering the first conductive pattern; and
a second conductive pattern on the insulating layer, partially crossing the first conductive pattern, and having a thickness that is greater than a thickness of the first conductive pattern."

The critical distinguishing feature of Claim 1, as presented in the patent's summary and detailed description, is the specific thickness relationship between the first and second conductive patterns: the second conductive pattern having a thickness that is greater than a thickness of the first conductive pattern. This contrasts with the conventional approach where the conductive patterns might have "substantially equal to or slightly different" thicknesses, as described in the "BACKGROUND" section and illustrated in FIG. 11.

Hypothetical Obviousness Argument (General Principles):

Assuming hypothetical prior art references were available, an obviousness argument would proceed as follows:

1. Identify a Primary Reference: A primary reference would likely disclose a display device with a touch sensing unit comprising a display panel, a first conductive pattern on the display panel, an insulating layer covering the first conductive pattern, and a second conductive pattern on the insulating layer, partially crossing the first conductive pattern. This describes the general architecture of integrated touchscreens, which is well-known in the art (as suggested by the "Prior art keywords: display device, touch sensing unit").

2. Identify a Secondary Reference or Known Principle: The challenge would then be to find a secondary reference or demonstrate a known principle that would motivate a person having ordinary skill in the art (POSITA) to specifically make the second conductive pattern thicker than the first conductive pattern.

   • Problem to be Solved: The patent itself identifies the problem in the prior art: "a crack occurs at an area in which the step difference exists [in the insulating layer]... Due to the crack... a short (e.g., electrical short) defect of the touch sensing unit 200 is generated." The patent asserts that its solution of making the first conductive pattern thinner "minimizing the occurrence of the crack in the insulating layer."

   • Motivation to Combine/Modify: A POSITA, facing the problem of cracking in the insulating layer and subsequent shorting in touch sensing units where two conductive patterns cross, would be motivated to find ways to reduce stress on the insulating layer. If prior art (e.g., a reference or common general knowledge) suggested that reducing the "step difference" caused by a buried conductive layer could mitigate cracking in an overlaying insulating layer, then a POSITA might be motivated to make the lower conductive pattern (the first conductive pattern) thinner.

   • Reasonable Expectation of Success: If the prior art or common knowledge in the field of display manufacturing indicated that thinner underlying layers lead to smoother insulating layers with fewer stress points, a POSITA would have a reasonable expectation that making the first conductive pattern thinner would reduce cracking and shorting.

3. Specific Combinations (If Prior Art Existed):
   For example, if a first prior art reference (e.g., US XXXXXXXX) disclosed a display device with a touch sensing unit where both conductive patterns had similar thicknesses, and a second prior art reference (e.g., US YYYYYYYY) taught that reducing step height variations in layered structures improves the integrity of overlying dielectric layers, a POSITA might be motivated to combine these teachings. Specifically, they would apply the principle from US YYYYYYYY to the touch sensing unit of US XXXXXXXX by making the first conductive pattern (the one covered by the insulating layer) thinner than the second conductive pattern, thereby reducing the step height and the likelihood of cracks in the insulating layer.

   Further claims relating to specific thickness ranges (e.g., Claim 5), multi-layer conductive patterns (e.g., Claim 6, 11), and materials (e.g., Claim 10, 15) would require additional prior art disclosures or established engineering principles to be rendered obvious. For instance, the use of Ti/Al/Ti layers for conductive patterns (Claims 10, 15) is a common metallization scheme for its conductivity (Al) and adhesion/barrier properties (Ti), and such a structure, potentially with specified thickness ratios (Claims 7-9, 12-14), might be found in prior art relating to flexible electronics or transparent electrodes.

Conclusion:

Without specific prior art references that disclose the individual elements of Claim 1, particularly the relative thickness of the conductive patterns, and a clear motivation to combine them in the manner claimed, a definitive obviousness determination cannot be made. However, based on the problem identified by the patent (insulating layer cracking and shorting due to step differences), a hypothetical obviousness argument would focus on whether a POSITA, having access to prior art teaching the general structure of touch sensing units and principles for improving insulating layer integrity by reducing underlying topographical variations, would have been motivated to make the lower conductive pattern thinner with a reasonable expectation of success.