Electroluminescence Display Panel Driving Circuit
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Solution Overview
Problem
Conventional electroluminescence display apparatuses experience luminance deviations between compensation and non-compensation pixels when frame frequency varies rapidly, causing the position of compensation pixels to be recognizable by users.
Innovation Solution
The electroluminescence display apparatus maintains a fixed first vertical blank period and varies the length of a second vertical blank period based on frame frequency, ensuring that the luminance recovery period remains constant for compensation pixels, thereby preventing recognition of their position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If external compensation technology is used to compensate for electrical characteristic deviation between pixels, then image quality is improved, but luminance deviation between compensation pixel and non-compensation pixel increases when frame frequency varies rapidly, making the position of compensation pixel recognizable
Solution Approach 1:
The patent dynamically adjusts the length of the second vertical blank period based on frame frequency variations. When frame frequency changes, the controller modifies the duration of the second vertical blank period to maintain constant luminance recovery time for compensation pixels, preventing luminance deviation and position recognition while preserving compensation effectiveness
Solution Approach 2:
The patent changes the parameter of vertical blank period length specifically for the second vertical blank period. By making this parameter variable instead of fixed, the system adapts to frame frequency changes and maintains consistent luminance recovery conditions, resolving the contradiction between compensation precision and luminance uniformity
2Illumination intensity
If the vertical blank period is extended to accommodate luminance recovery, then compensation pixel luminance is restored, but the position of compensation pixel becomes more recognizable due to increased time difference
Solution Approach 1:
The system dynamically adjusts the second vertical blank period length based on frame frequency. This dynamic adjustment ensures that the luminance recovery time remains constant and does not create visible time differences, while still providing sufficient time for luminance recovery of compensation pixels
3Use of energy by moving object
If the frame frequency is varied to match input image, then energy efficiency is improved, but luminance deviation between compensation and non-compensation pixels increases
Solution Approach 1:
The patent implements dynamic adjustment of the second vertical blank period length in response to frame frequency changes. This allows the system to vary frame frequency for energy efficiency while maintaining luminance uniformity through compensatory adjustment of the vertical blank period parameter
Solution Approach 2:
The controller receives frame frequency information and uses this feedback to adjust the second vertical blank period length accordingly. This feedback mechanism ensures that luminance uniformity is maintained despite frame frequency variations, resolving the contradiction between energy efficiency and luminance uniformity
Data Source
AI summary
An electroluminescence display apparatus includes a display panel, including a pixel including a driving element and a light emitting device, and a panel driving circuit supplying the pixel with a first data voltage for a display driving operation and a display scan signal synchronized with the first data voltage in a vertical active period succeeding a first vertical blank period and maintaining the first data voltage in the pixel during a second vertical blank period succeeding the vertical active period, wherein a length of the first vertical blank period is fixed regardless of a variation of a frame frequency, and a length of the second vertical blank period varies based on the variation of the frame frequency.