Electroluminescence Display Gamma Generator Integration
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Solution Overview
Problem
Conventional electro-luminescence (EL) display devices face challenges in reducing manufacturing costs and process time due to the complexity of the gamma voltage supplier circuit, which includes many resistors, making it difficult to mount on chip-on-film (COF) and leading to brightness deviations between panels.
Innovation Solution
The proposed solution involves a gamma generator integrated within the data integrated circuit, using fewer resistors and analog digital converters to generate reference gamma voltages for red, green, and blue cells, allowing for uniform brightness and reduced manufacturing complexity by eliminating the need for a separate flexible printed circuit (FPC).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate gamma voltage supplier with many resistors is used, then reference gamma voltages can be generated for red, green, and blue cells, but the device complexity increases and manufacturing cost increases due to difficulty in mounting on COF
Solution Approach 1:
The patent combines the gamma voltage generation function with the data integrated circuit by integrating a gamma generator into the data driver. This merging eliminates the need for a separate gamma voltage supplier and its associated resistors, reducing device complexity while maintaining the ability to generate reference gamma voltages for red, green, and blue cells to ensure brightness uniformity
Solution Approach 2:
The data integrated circuit is designed to perform multiple functions: it serves as both the data driver and the gamma voltage generator. The gamma generator within the data driver can generate different reference gamma voltages (VH_R, VL_R, VH_G, VL_G, VH_B, VL_B) for different color cells, making the circuit universal and eliminating the need for separate dedicated gamma voltage supplier circuits
2Reliability
If a separate gamma voltage supplier with many resistors is used, then reference gamma voltages can be generated, but the manufacturing cost increases and process time increases due to mounting difficulties
Solution Approach 1:
By merging the gamma generator into the data integrated circuit, the patent eliminates the need for separate mounting of a gamma voltage supplier and its numerous resistors on the COF. This integration significantly improves ease of manufacture and reduces process time while maintaining the ability to generate accurate reference gamma voltages for brightness uniformity
3Device complexity
If a separate gamma voltage supplier with many resistors is used, then reference gamma voltages can be generated, but brightness deviations between panels occur
Solution Approach 1:
The integration of the gamma generator into the data driver ensures that the reference gamma voltages are generated in close proximity to where they are used, reducing voltage drops and variations. This merging approach improves manufacturing precision and brightness consistency between panels by eliminating the complex resistor network that caused variations in the separate gamma voltage supplier design
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces manufacturing costs and process time by integrating the gamma generator with the data integrated circuit, enabling precise control of brightness deviations and simplifying the mounting process, thus enhancing the efficiency and consistency of EL display devices.
Implementation Method 1
The EL display in such display devices is a self-luminous device capable of light-emitting a phosphorous material by a re-combination of electrons with holes
Data Source
AI summary
The present invention relates to an electro-luminescence display that is adaptive for reducing its manufacturing cost as well as reducing its process time.An electro-luminescence display device according to an embodiment of the present invention includes a gamma generator to output a reference gamma voltage corresponding to a control data supplied from the outside; and at least one data integrated circuit to receive a data from the outside and to generate a data signal corresponding to the bit number of the data in use of the reference gamma voltage.