Flat Panel Display Driver Current Mirror Segmentation
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Solution Overview
Problem
In organic electroluminescence (OLED) flat panel displays, increasing the number of segment lines leads to difficulties in transmitting pixel data due to resistance differences on connection lines, causing current and voltage mismatches, which result in insufficient power supply and increased chip area when trying to reduce the number of channels managed by a reference current generator.
Innovation Solution
A driver for flat panel displays that uses a reference current source with a first current mirror configured with low-voltage MOS transistors and channels with a second current mirror using high-voltage MOS transistors, allowing for efficient mirroring of the reference current to generate output currents, reducing current offset and ensuring sufficient voltage supply across segment lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the number of segment lines is increased to achieve high-quality display, then display quality is improved, but current and voltage mismatches occur due to resistance differences on connection lines
Solution Approach 1:
The driver is divided into multiple driving blocks, each managing a specific range of segment lines. This segmentation allows each block to independently compensate for resistance differences in its assigned range, maintaining current and voltage matching across all segment lines even as the total number increases.
Solution Approach 2:
Each driving block is configured with local compensation capabilities tailored to its specific segment line range. The resistance compensation is applied locally within each block rather than globally, allowing precise adjustment for the specific characteristics of each segment line group.
2Manufacturing precision
If the number of channels managed by one reference current generator is reduced to minimize manufacturing process errors, then current matching is improved, but chip area increases
Solution Approach 1:
The reference current generator is segmented into multiple driving blocks, each with its own channel configuration. This allows the system to maintain a reasonable number of channels per reference current generator (improving manufacturing precision) while organizing multiple blocks in a compact arrangement that minimizes overall chip area.
Solution Approach 2:
Multiple driving blocks are arranged and connected in a compact configuration that shares common structures and resources, reducing the total chip area required while maintaining the beneficial low channel-count-per-generator 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
The solution effectively reduces current offset and ensures high brightness intensity across segment lines, even in high-current output modes, while minimizing chip area and manufacturing process errors, enabling a wide range of reference current applications.
Implementation Method 1
A driver for flat panel displays that uses a reference current source with a first current mirror configured with low-voltage MOS transistors and channels with a second current mirror using high-voltage MOS transistors, allowing for efficient mirroring of the reference current to generate output currents, reducing current offset
Implementation Method 2
channels with a second current mirror using high-voltage MOS transistors, allowing for efficient mirroring of the reference current to generate output currents, reducing current offset and ensuring sufficient voltage supply across segment lines
Data Source
AI summary
A driver for use in a flat panel display, the driver adapted to drive segment lines by using a current, the current being generated by referring to a reference current outputted from a reference current source, the driver includes a driving block selector for selecting a reference current driving block to be activated according to a reference current value with respect to the reference current; and a plurality of reference current driving blocks for transferring the reference current value to a part where the segment lines are driven.