## 4 Case Study  
The case is a raw material factory for the panel industry in Taiwan. The case specializes in the manufacturing of CF & TS. The company was established in 1999. Since 2008, the production of TS has increased from the original production of CF. The number of employees is ~400. its capital is ~200 million US dollars. TS products are based on projective capacitive technology. For the description of the CF & TS process flow, see Figures 2 and 3.  
Figure 2 is the color filter product process for the case. Starting from the glass, there are black matrix, red (R), green (G), and blue (B) subpixel production processes. These processes are all part of the photoprocess. Subsequent ITO (indium tin oxide) sputtering. Therefore, the main production is in the photoprocess. The production process of the photoprocess is shown on the right, including cleaning (UV, precleaner), coating, pre-oven & cooling (HP/CP), exposure (Aligner), develop, and Oven. The last process is the ITO process. Some products will add a photospacer process, which is a photoprocess too. Therefore, this study will improve the photoprocess area. In the center of the Figure 2, a schematic diagram of the product stack structure is shown.  
\begin{table}
\begin{tabular}{p{142.3 pt} p{142.3 pt} p{142.3 pt} p{142.3 pt}} \hline \hline
**Steps** & **Description** & **Indicators (Outputs)** & **Tools** \\ \hline
1. Continuous observation of the changed production system 2. Collect production data 3. Confirm whether performance has achieved target 4. Modify relevant SOP and transfer technical information 5. End the project and return the members to the original unit & The control phase primarily seeks to perform improved performance through long-term monitoring. If the performance is confirmed to achieve the goal. The project team should recognize the project technical data to produce a closed report for the project transfer. After the handover is completed, members of the project team can return to the organization’s original preparation to end the project task. & Closing report 1. Assess improved performance 2. Related technical information 3. Future improvement suggestions & 1. FMEA 2. Control Chart 3. Poka-Yoke 4. Control Plan 5. SIP/SOP 6. Check list \\ \hline \hline \end{tabular}
\end{table}
Table 5: Control Phase: Steps, Description, Indicators, and Tools.  
Figure 3 is the TS product process for the case. In addition to Metal Sputter and front/back ITO sputter, the process is almost entirely in the photoprocess area. Through the contamination of the touch sensor, the main proportion is also from the photoprocess. The figure on the lower right is a schematic diagram of the stack structure of the TS product.  
The case promotes quality improvement projects through Six Sigma. It is important to monitor processes factors in manufacturing, e.g., the flow of purified water in the cleaning equipment and  
Figure 3: Touch sensor (TS) processes (Source from the case—S company).  
Figure 2: Color filter (CF) processes.  
temperature changes in baking equipment. The results of the product appearance inspection failure and the related failure data are monitored by the manufacturing measurements, as well as the product characteristic measurements obtained by the monitoring equipment; the risk production batch size of the failure process is reduced.