Obviousness

Obviousness Analysis of U.S. Patent 8,267,537

An analysis of U.S. Patent 8,267,537 ("the '537 patent") and the relevant prior art suggests that the claims of the patent would have been considered obvious to a person having ordinary skill in the art (POSA) at the time the invention was made. The legal standard for obviousness is established under 35 U.S.C. § 103, which states that a patent may not be obtained if the differences between the claimed invention and the prior art are such that the invention as a whole would have been obvious to a POSA.

The core of the '537 patent, particularly independent claim 1, lies in a backlight unit with an LED module, a supporting case, a "bending part" to fix one end of the module, and a separate "fixing part" for another end. The stated goal is to simplify the replacement of LED modules. This configuration represents a combination of known elements to achieve a predictable result.

Several combinations of prior art references can be asserted to render the claims of the '537 patent obvious. Below are two such combinations.

Combination 1: US 2007/0230206 A1 (Hsu) and General Engineering Principles

1. US 2007/0230206 A1 ("Hsu")

• Disclosure: Hsu, which was cited by the examiner during the prosecution of the '537 patent, discloses a direct backlight module. It clearly teaches a backlight unit comprising a plurality of light-emitting diode (LED) bars (equivalent to the "LED module" in the '537 patent), a bottom plate (equivalent to the "case"), and a mechanism for securing the LED bars to the bottom plate. Hsu's design aims for a slim backlight module.

• Elements Taught:

  • LED Module: Hsu's LED bars are analogous to the '537 patent's LED module.
  • Case: Hsu's bottom plate serves the same supporting function as the '537 patent's case.
  • Fixing Mechanism: Hsu discloses using fasteners to secure the LED bars to the bottom plate.

Motivation to Combine: A POSA designing a backlight unit would be motivated to create a structure that is not only functional but also easy to assemble and repair. While Hsu teaches securing LED bars, a POSA would recognize the desirability of reducing the number of fasteners to streamline manufacturing and maintenance. It would have been an obvious design choice to modify the case to include an integrated feature that secures one end of the LED module, thereby reducing the number of separate fasteners required. Creating a bent tab or flange from the case material itself to act as a holder or guide is a well-known and simple mechanical fastening technique. This modification would be a predictable variation of Hsu's design to achieve the common goal of efficient assembly. The "bending part" of the '537 patent is such a predictable variation.

Combination 2: US 2008/0123369 A1 (Chang) and US 7,699,484 B2 (Lin)

1. US 2008/0123369 A1 ("Chang")

• Disclosure: Chang discloses a backlight module with a support device for optical slice units (which can include LED bars). The support device includes features to position and hold the optical units.

• Elements Taught:

  • LED Module/Optical Unit: Chang's disclosure encompasses light sources like LED bars.
  • Case/Support Structure: Chang describes a frame and support elements for the light sources.
  • Positioning/Guiding Features: The support device in Chang is designed to precisely locate and hold the optical components.

2. US 7,699,484 B2 ("Lin")

• Disclosure: Lin teaches a direct-type backlight module with a specific focus on fixing members for securing light sources. Lin's design uses fixing members and elastic members to hold the light sources in place on a base plate.

• Elements Taught:

  • LED Module: Lin explicitly describes LED light sources.
  • Case: A base plate supports the LED light sources.
  • Fixing Part: Lin details the use of fixing members, which are analogous to the "fixing part" in the '537 patent.

Motivation to Combine: A POSA, aware of both Chang's teachings on positioning and guiding optical units and Lin's use of fixing members, would be motivated to combine these concepts to create a more efficient and robust assembly. It would have been obvious to integrate a guiding and fixing feature, akin to Chang's positioning elements, directly into the case (Lin's base plate) to simplify the design. This integrated feature would serve the function of the "bending part" in the '537 patent. By having a bent portion of the case hold one end of the LED module, a POSA could then use fewer of Lin's separate fixing members to secure the other end. This combination would be a straightforward application of known design principles to reduce component count and assembly time, which are constant goals in the manufacturing of display devices.

Conclusion

The invention claimed in US patent 8,267,537 represents a combination of features that were individually known in the prior art. The key inventive concept, the "bending part" integrated into the case to reduce the number of separate "fixing parts," would have been an obvious design choice for a person of ordinary skill in the art seeking to simplify the assembly and repair of backlight units. The prior art already taught the essential components and the motivation to create easily manufacturable and serviceable products was a constant in the industry. Therefore, the claims of the '537 patent are likely invalid as obvious under 35 U.S.C. § 103.