Display Scan-Driver Layout for High Refresh Narrow Bezels
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Solution Overview
Problem
Existing display devices face challenges in increasing refresh rate while minimizing the area of the picture frame and maintaining reliability due to the need for multiple drive circuits for odd and even horizontal scanning lines, leading to increased circuit elements and potential failures.
Innovation Solution
A display device configuration with separate write and initialization control circuits in distinct picture-frame regions, utilizing thin-film transistors with low-temperature polysilicon channels, and a shift register with a latch function to drive control lines from one edge of the display unit, reducing the number of circuit elements and improving reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If separate drive circuits are provided for odd and even horizontal scanning lines to achieve high refresh rates, then the refresh rate increases, but the picture frame area increases and reliability decreases due to increased circuit elements
Solution Approach 1:
The drive circuit is segmented into two independent circuits: a first drive circuit for even-numbered horizontal scanning lines and a second drive circuit for odd-numbered horizontal scanning lines. These circuits are disposed at opposite ends of the display unit, allowing parallel operation that achieves high refresh rates while minimizing the area occupied by drive circuits in the picture frame region.
Solution Approach 2:
The patent utilizes the spatial dimension by disposing drive circuits at opposite ends (first end and second end) of the display unit along the vertical direction. This dimensional arrangement allows simultaneous driving of odd and even scanning lines without increasing the horizontal area occupation, effectively achieving high refresh rates with minimal picture frame area increase.
2Productivity
If separate drive circuits are provided for odd and even horizontal scanning lines to achieve high refresh rates, then the refresh rate increases, but reliability decreases due to increased number of circuit elements
Solution Approach 1:
By segmenting the drive circuit into two independent circuits disposed at opposite ends, the patent reduces the concentration of circuit elements in one location. This segmentation decreases the overall number of circuit elements that could potentially fail, thereby improving reliability while maintaining high refresh rate capability.
3Productivity
If multiple drive circuits are provided for high refresh rates, then the refresh rate increases, but device complexity increases due to multiple drive circuits
Solution Approach 1:
The drive circuit is divided into two independent segments (first and second drive circuits) that operate in parallel. Each segment handles a specific set of scanning lines (even or odd), which simplifies the control logic within each circuit and reduces overall device complexity compared to a single complex drive circuit handling all lines.
Solution Approach 2:
Instead of using a single drive circuit that sequentially processes all scanning lines, the patent inverts the approach by using two drive circuits that simultaneously process different sets of scanning lines. This inversion of the sequential processing approach reduces the complexity of signal routing and control within each individual circuit.
Data Source
AI summary
A display device is implemented that can increase the refresh rate while suppressing an increase in the area of a picture frame and a reduction in reliability. In a first picture-frame region there are disposed a first and a third write control circuit that drive even-numbered write control lines and odd-numbered write control lines, respectively, and a first initialization control circuit that drives even-numbered initialization control lines. In a second picture-frame region there are disposed a second and a fourth write control circuit that drive the even-numbered write control lines and the odd-numbered write control lines, respectively, and a second initialization control circuit that drives odd-numbered initialization control lines. LTPS-TFTs are adopted for all transistors included in a first unit circuit in a shift register that implements each write control circuit. A second unit circuit in a shift register that implements each initialization control circuit has a latch function and drives an initialization control line based on a value held internally.