Influence of manufacturing processes and flatness of input material on black uniformity of LCD displays in automotive industry
Vliv výrobních procesů a rovinnosti vstupních materiálů na černou homogenitu LCD displejů v automobilovém průmyslu
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České vysoké učení technické v Praze
Czech Technical University in Prague
Czech Technical University in Prague
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Tato práce se zabývá optickým chováním LCD displejů, které se používají v kokpitech v automobilovém průmyslu. Konkrétně se zaměřuje na analýzu možných vlivů výrobního prostředí na rovnoměrnost černé homogenity displejů pomocí statistických metod. Během experimentů jsou zkoumány údaje o černé homogenitě a rovinnosti vstupního materiálu i polotovarů pocházejících ze tří výrobních cyklů. Z práce je patrné, že vstupní materiál je převážně ve specifikaci. Prokazuje také, že neexistuje žádná korelace mezi černou homogenitou a rovinností displeje. Navíc bylo potvrzeno, že první semi-produkt se přizpůsobuje hlavně rovinnosti krycího skla, nikoliv displeje. Jelikož se výroba skládá z několika kroků, byl zjištěn hlavní přispěvatel ke zhoršení černé homogenity mezi výrobními procesy. A konečně, projekt na zlepšování černé homogenity mezi výrobními cykly byl označen za částečně úspěšný, neboť na několika výrobních linkách bylo pozorováno možné zlepšení optického chování. Výsledky této práce byly využity při rozhodování ve společnosti Continental, kde byly experimenty provedeny, a vzaty jako poznatky pro vývoj nových výrobků.
This thesis deals with the optical performance of LCD displays that are used in cockpits in automotive industry. It focuses specifically on analysis with the help of statistical methods of the possible impacts from the production environment to the black uniformity of the displays. During the experiments, data of black uniformity and flatness of the incoming material as well as semi-products coming from three production cycles are investigated. The work shows that the incoming material is mainly in specification. It also demonstrates that there is no correlation between the black uniformity and flatness of the display. Additionally, it has been confirmed that the first semi-product mainly adapts to the flatness of the cover glass and not the display. As the production consists of several steps, the main contributor along the production processes to the degradation of Black uniformity has been found. Lastly, the improvement program between the production cycles has been marked as partially successful, as there has been possible improvement of optical behavior observed on several production lines. The results of this thesis were used in decision-making in the company of Continental, where the experiments were done, and taken as knowledge learned to the development of the new products.
This thesis deals with the optical performance of LCD displays that are used in cockpits in automotive industry. It focuses specifically on analysis with the help of statistical methods of the possible impacts from the production environment to the black uniformity of the displays. During the experiments, data of black uniformity and flatness of the incoming material as well as semi-products coming from three production cycles are investigated. The work shows that the incoming material is mainly in specification. It also demonstrates that there is no correlation between the black uniformity and flatness of the display. Additionally, it has been confirmed that the first semi-product mainly adapts to the flatness of the cover glass and not the display. As the production consists of several steps, the main contributor along the production processes to the degradation of Black uniformity has been found. Lastly, the improvement program between the production cycles has been marked as partially successful, as there has been possible improvement of optical behavior observed on several production lines. The results of this thesis were used in decision-making in the company of Continental, where the experiments were done, and taken as knowledge learned to the development of the new products.