62.1: Mechanical Reliability of LCD Panels under Static Loading

Gulati, Suresh T.; Helfinstine, J. D.; Bayne, J. F.; Powell, William R.; Lapp, Josef C.

doi:10.1889/1.1821377

Cited by 12 publications

(12 citation statements)

References 3 publications

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“…In the previous study, the value that was obtained when the 0.7-and 1.1-mmthick and 50 × 50-mm Code 1737 AMLCD glass substrates (alkaline-earth boroaluminosilicate glass) were measured was 65.3 ± 0.4 MPa·mm 0.5 [4]. In particular, the corresponding results demonstrated that the mirror constant of glass does not change even if the glass thickness is different.…”

Section: Mirror Radius and Mirror Constantmentioning

confidence: 88%

AMLCD glass mirror constant and crack flaw size in non-crack LCD panels

Kim

Choi

2016

Journal of Information Display

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Portable models based on the latest liquid crystal displays (LCDs) have been useful in various areas. Many developers have pursued thinner hardware as well as the advanced performance of portable models. Therefore, as the panel glass continuously becomes thinner, the strength characteristics of glass are highlighted as an important issue. In particular, the strength of the LCD glass is mentioned as an important issue. The occurrence of surface scratches on the active-matrix liquid crystal display glass substrates should be minimized to produce portable models with stability; if their crack flaw sizes are kept below a certain level or close to zero, strength-differentiated LCD panel production will be possible. This study confirmed that in LCD panels where the thin-film transistor-color filter (TFT-CF) is assembled, cracks are generated mainly in the TFT glass, and the mirror constant is at a 60.038 MPaċmm 0.5 level. In addition, this suggests that the size of the crack flaws that may occur on the glass surfaces during the LCD process should be minimized to produce panels that can withstand a certain impact level through the fracture surface analysis of the glass crack origins. ARTICLE HISTORY

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Section: Mirror Radius and Mirror Constantmentioning

confidence: 88%

AMLCD glass mirror constant and crack flaw size in non-crack LCD panels

Kim

Choi

2016

Journal of Information Display

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“…The mechanical integrity of LCD glass substrate has been evaluated previously using both the ring-on-ring test for surface strength and vertical bend test for edge strength [1][2][3][4]. Similarly, the mechanical integrity of LCD panel has been evaluated recently using static and dynamic loading in the center region [ 5,6 ]. All of these tests, however, stress a finite region (less than 1 %) of either the substrate or the panel thereby limiting our understanding of total integrity of the whole panel.…”

Section: Theory Of Cylindrical Bendingmentioning

confidence: 99%

59.5: A Novel Test for Evaluating Surface and Edge Strengths of LCD Panel

Helfinstine

Gulati

Roe

et al. 2006

SID Symposium Digest

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The cylindrical bend test offers the unique advantage of stressing both the #1 and #4 surfaces along with their corresponding edges in a uniform manner thereby proofing all of the exposed surfaces to a prescribed stress value dictated by the radius of cylindrical bend fixture. Several LCD panels, comprised of Eagle 2000 and Code 1737 glasses with substrate thicknesses of 1.1 and 0.7 mm and with diagonal dimensions ranging from 5″ to 23″, were tested in the cylindrical bend fixture to stresses ranging from 34 MPa to 83 MPa. Failure modes, fracture origins and strain values on #4 surface and the edges were recorded. The stresses based on cylindrical bend theory were found to be in good agreement with those computed from measured strain components and/or mirror radius. The failure origins were observed both on #4 surface as well as on the edges depending on handling damage and the quality of edge finish. In general, edges appear to be weaker due to their i) inadequate finish and ii) greater vulnerability to handling damage during panel manufacturing.

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“…A companion paper [1] discusses static, or quasi-static loading of LCD modules as well as standard strength testing of stand-alone LCD glass specimens. It is observed that glass thickness has little effect on the strength and that the # 4 1 to propose a standard set-up for impact and static loading of LCD modules…”

Section: Objectives and Backgroundmentioning

confidence: 99%

62.2: Mechanical Reliability of LCD Panels under Dynamic Loading

Helfinstine

Gulati

Bayne

et al. 2004

Symp Digest of Tech Papers

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An important aspect of mechanical reliability of LCD panels is to understand and quantify their response to impact loading. This paper studies the behavior of 17″ modules impacted by a spherical ball traveling at a speed of up to ∼1 m/sec. At this velocity, the deformation response of the module system is significantly different from that during quasi‐static loading. In view of much shorter duration of impact test, the LCD panels can sustain relatively large loads without any measurable slow crack growth. The test data show that the dynamic strength of these panels, estimated from fracture mirror, is significantly higher than their quasi‐static strength. With higher strength and immeasurable slow crack growth the LCD panels should not experience cumulative damage during multiple impact loading implying that their mechanical reliability under such loading is excellent.

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62.1: Mechanical Reliability of LCD Panels under Static Loading

Cited by 12 publications

References 3 publications

AMLCD glass mirror constant and crack flaw size in non-crack LCD panels

AMLCD glass mirror constant and crack flaw size in non-crack LCD panels

59.5: A Novel Test for Evaluating Surface and Edge Strengths of LCD Panel

62.2: Mechanical Reliability of LCD Panels under Dynamic Loading

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