本研究以迴歸分析探討企業經營規模與績效為主，並配合資料包絡分析法，觀察各樣本公司之經營效率。試圖瞭解在TFT-LCD面板產業中，經營規模愈大是否績效表現愈佳。另外，本研究亦引入總體變數，使分析模型更完整化。
本研究期間為2003年第一季至2005年第四季，實證樣本公司為台日韓大尺寸TFT-LCD面板製造商，共96筆季資料。分四個模型，被解釋變數分別為資產報率、毛利率、純益率及稅前淨利來衡量經營績效，解釋變數則為經營規模以及總體變數。而在DEA模型中，本研究以總資產、員工數以及研發規模為投入項；產出項則為稅前淨利及營業額。
實證結論如下：
一、在大尺寸TFT-LCD面板產業中，經營規模對於績效是有顯著影響，但並非皆是正向影響，而是僅「銷售規模」與經營績效呈現正向影響，其餘皆是負向影響。
二、在總體面因素中，本研究納入了「利率水準」、「匯率水準」及「景氣情況」，實證結果發現，總體變數對於大尺寸TFT-LCD面板產業皆具有顯著之影響性。
三、在經營效率分析中，藉由DEA軟體實證後發現，樣本公司中市佔率最大的Samsung其經營效率並非最佳，而市佔率最小之Sharp其經營效率亦非最差，顯示經營規模大的公司，短期規模經濟並未顯現出來，且其資源運用及管理不一定是最適的。因此，友達合併廣輝，可能是著眼於長期的全球佈局，而非短期的規模效應。

This study applies regression analysis to probe into the relationship between business size and performance in coordinate with data envelopment analysis to observe the business efficiency of those sampled firms. The study also attempts to understand whether business size in TFT-LCD panel industry is larger and if business performance is better. In addition, this study used macroeconomic factors to improve the analysis model.
The empirical period of this study ranges from March 2003 to December 2005. The sampled firms are large-size TFT-LCD panel manufacturers in Taiwan, Japan and South Korea, with 96 quarterly data 4 different models. The dependent variables include return on assets, gross profit rate, return on sales and pretax net income; the independent variables include business size and macroeconomic factors. In input items of the DEA model include total asset, number of employees and R&D expense, and output items include pretax net income and net sales.
The empirical results are as follows:
First, in large-size TFT-LCD panel industry, business size shows a significant influence on performance; however only “sales scale” has a positive impact on performance.
Second, in macroeconomic factors, this study used interest rate level, exchange rate level, and business situation; the results showed that all the macroeconomic variables have significant impact on the business performance in large-size TFT-LCD panel industry.
Third, in business efficiency analysis, this study applies the DEA software. According to the empirical results, Samsung, who had the largest market share in the large-size TFT-LCD panel industry, did not show the highest business efficiency. On the other hand, Sharp, who had the smallest market share in the sampled firms, did not show the worst business efficiency. In the short run, large sized companies did not show significant economies of scale and the allocation and management of the firm’s internal resources might not be optimal. Therefore, AUO’s decision to merge with QDI, might be due to the global arrangement in the long-run and not the business size effect the short-run.

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