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Temperature compensation for shape-induced in-plane stresses in glass substrates

A glass, flat technology used in the field of glass sheet manufacturing

Active Publication Date: 2009-12-02
CORNING INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the degree of deformation is usually small, for the pixel structures used in modern displays, the distortion caused by cutting can be large enough to produce a considerable number of defective (needing to be scrapped) displays

Method used

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  • Temperature compensation for shape-induced in-plane stresses in glass substrates
  • Temperature compensation for shape-induced in-plane stresses in glass substrates
  • Temperature compensation for shape-induced in-plane stresses in glass substrates

Examples

Experimental program
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Effect test

Embodiment 1

[0234] Compensation for the temperature distribution of a spherical glass sheet

[0235] This embodiment illustrates the principle of the present invention by taking a spherical glass sheet as an example. Generally speaking, the method adopted in this embodiment and embodiment 2 is to simulate the stress generated when the selected forming body is pressed onto the plane by vacuum, and then use the calculated stress value to select the thermal distribution to obtain the calculated thermal stress distribution , this distribution can at least partially eliminate the stress distribution caused by the vacuum.

[0236] image 3 A spherical sheet of glass is shown with a width of 1100 mm and a length of 1300 mm, and a ball with a dome height δ of 1 mm. Figure 4 The calculated edge stress levels along the width and length of the glass sheet when the glass sheet is pressed onto a flat surface are shown (curves 43 and 45, respectively).

[0237] Figure 5 with 6 shows the geometri...

Embodiment 2

[0256] Compensation for the temperature distribution of an ellipsoidal glass sheet

[0257] This example extends the analysis of Example 1 to ellipsoid shaped glass slides.

[0258] Figure 12 A representative ellipsoid shaped glass sheet is shown, wherein the ratio (F) of the curvature in the width direction of the glass sheet to the curvature in the length direction of the glass sheet is 2.0.

[0259] Figure 14A shown Figure 12 The edge stress produced when the shown ellipsoid is flattened (curve 59 along the width direction of the glass sheet; curve 61 along its length direction), Figure 14B shows the pass Figure 13 Compensating thermal stress applied along the width of the glass ribbon produced by the medium heat profile. specifically, Figure 14B Middle curves 63 and 65 show compensating thermal stresses along the width and length of the glass sheet, respectively. Compare Figure 14A and 14B It can be seen that Figure 13 The thermal profile shown can be use...

Embodiment 3

[0263] Decomposition into Components: Edge Stress Decomposition

[0264] This example shows how to decompose the edge stress distribution into long-scale and short-scale variables.

[0265] Figure 17 Shown are representative in-plane stress measurements taken along one edge of a glass sheet under vacuum flattening conditions, the plane thickness being averaged (curve 67). The figure also shows the decomposition of the stress distribution into long-scale components (low spatial frequency components) and short-scale components (high spatial frequency components). In particular, curve 69 shows the length component, which is determined by fitting a parabola to curve 67, for example. Curve 71 shows the short metric component, which is determined by subtracting curve 69 from curve 67 . Alternatively, the decomposition can also be performed as a Fourier series expansion.

[0266] This decomposition can be applied in a variety of ways. For example, the temperature profile across...

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Abstract

Methods of fabricating glass sheets (13) are provided in which the sheets are cut from a glass ribbon (15) composed of a glass having a setting zone temperature range (SZTR). As the glass is drawn, it passes through the SZTR (31) and an across-the- ribbon temperature distribution is produced at at least one longitudinal position along the ribbon to compensate for in-plane stress induced in the sheets (13) when flattened. Through such thermal compensation, glass sheets (13) are produced which exhibit controlled levels of distortion when cut into sub-pieces and thus are suitable for use as substrates in the manufacture of, for example, flat panel displays, e.g., LCD displays.

Description

technical field [0001] The present invention relates to the manufacture of glass sheets which are used, for example, as substrates in display devices such as liquid crystal displays (LCDs). More specifically, the present invention relates to methods of reducing the amount of distortion of a glass substrate when the glass substrate is cut into parts, for example, during the manufacture of such displays. Background technique [0002] Display devices have a wide range of applications. For example, thin film transistor liquid crystal displays (TFT-LCDs) are used in notebook computers, flat-panel desktop monitors, LCD televisions, and Internet and communication equipment, among others. [0003] Many display devices, such as TFT-LCD panels and organic light-emitting diode (OLED) panels are fabricated directly on flat glass sheets (glass substrates). To increase manufacturing speed and reduce cost, typical board manufacturing processes can simultaneously manufacture multiple boar...

Claims

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Application Information

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IPC IPC(8): C03B17/06
CPCC03B17/067C03B17/064Y02P40/57C03B17/06
Inventor S·R·马卡姆G·梅达D·G·尼尔森D·A·诺勒R·A·诺瓦克
Owner CORNING INC
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