Technical Specification on Cover Glass Thickness and Impact Resistance for 1.14 Inch Display Modules

Currently, our cover glass surface hardness is 6~7H (pencil hardness), providing good scratch resistance. In terms of impact resistance, we have established clear empirical correlations: cover glass with thickness ≤2.0mm can achieve IK06 protection level (impact energy 1J), and thickness ≤2.8mm can achieve IK07 protection level (impact energy 2J). Since 1.8mm falls within the ≤2.0mm range, it theoretically possesses IK06-level impact resistance, which is sufficient for routine drop protection of conventional handheld devices.

To address the Chenghao Optoelectronics customer’s concern that “impact resistance may be insufficient, leading to screen breakage,” our actual decision-making process is as follows:

First, we explain to the Chenghao Optoelectronics customer that impact resistance depends not only on glass thickness but also on the actual stress distribution after module assembly. Factors such as the support area between the display and the middle frame, the placement of buffer foam, and stress concentration at the glass edges all significantly affect actual impact performance. Therefore, evaluating whether 1.8mm is “sufficient” solely based on thickness is incomplete; a comprehensive assessment must consider the customer’s actual structural design.

Second, our practical decision-making follows two steps:
Step 1: Determine the target protection level based on the Chenghao Optoelectronics customer’s end-product application scenario. For handheld devices, IK06 is typically the basic requirement, and 1.8mm can already meet it. For industrial equipment or devices prone to heavier impacts, we recommend upgrading to IK07, which requires a 2.8mm thickness.

Step 2: Balance cost considerations with the Chenghao Optoelectronics customer’s budget. Increasing thickness from 1.8mm to 2.0mm or 2.8mm raises material costs and processing complexity. We provide cost-effectiveness recommendations based on the customer’s expected shipment volume and product pricing,avoiding unnecessary cost burdens from blind thickening.

Finally, we recommend that the Chenghao Optoelectronics customer provide their drop test requirements or actual usage environment specifications. We can then conduct targeted ball-drop simulation tests to verify with empirical data whether 1.8mm meets their protection needs. If test results indicate that 1.8mm does pose a risk, we will recommend upgrading to 2.0mm or 2.8mm, while simultaneously providing auxiliary structural improvement suggestions (such as adding buffer layers) to ensure every cost increment contributes meaningfully to enhanced protection.

In summary, our approach is: based on empirical test data, combined with the Chenghao Optoelectronics customer’s application scenario and cost considerations, to ultimately deliver an optimal solution that balances thickness, protection, and cost—rather than simply thickening or thinning without justification.

Tina

2026-7-28